![Linus Torvalds](/assets/img/avatar_default.png)
- sysctl and seccomp operation to discover available actions. (tyhicks) - new per-filter configurable logging infrastructure and sysctl. (tyhicks) - SECCOMP_RET_LOG to log allowed syscalls. (tyhicks) - SECCOMP_RET_KILL_PROCESS as the new strictest possible action. - self-tests for new behaviors. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Kees Cook <kees@outflux.net> iQIcBAABCgAGBQJZxVbTAAoJEIly9N/cbcAmvIAQALR9aVQQXjma4lLhZxwTsLtG rJm8t/o4y/2aBV8vzpFbMPT5gfN/PAkHJpCoxVPssx0k4PH2M7HjpnR6E1OC+erg RNom3uNdNqZeFlDpdX1qriYiCTB9p6rHe0DPwgG9iGqgDxsJ+G3W+x1sMZ1C+A0M shxA3fwt+Qpivo8Zq44xjMFjK+Zeor9V3yPc51QoZktWHlM16ID3HvHVnUtzqAUb nTWF6ZlmZlJ/lp4Dq8/55lytVcXPo240G3H0Odai+SNFakK6p5UO//BRBV209bmb 05jpAOH6uym1sxVz00TQXCtDqOEzs2mQgomtTSShHg8SrLFX7nFkEFtAVA6tEri2 FqDYce9KX7ZtOYiq83C7pnpAFCouc0z31dQl9USHiAiexXklwBIX+OsVv98omWGi pW43uLE2ovY0cpOsN50xI4mnxiGh6MhFcdbor2VLRJwLIFSw3XjjgNCCLyK4AJxs N514252qi70c9cWyAHYDLy077yTVxu3JUlsVQKtRTMfoFUq6bX1jPXVXE8qkVrui bc/Ay54pPrUwM854IpQ9ZBOuMfs6I5opocGIsBvMaND45U4o2B0ANCsxhuZ0zEtM E55DhK5OgjukNemQmlWK2foDckYdtkJXCj2yMBNQady0Uynr2BWZ6VDBP7vFcnRB UihRlFZRZleu8383uHsc =sKeC -----END PGP SIGNATURE----- Merge tag 'seccomp-v4.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux Pull seccomp updates from Kees Cook: "Major additions: - sysctl and seccomp operation to discover available actions (tyhicks) - new per-filter configurable logging infrastructure and sysctl (tyhicks) - SECCOMP_RET_LOG to log allowed syscalls (tyhicks) - SECCOMP_RET_KILL_PROCESS as the new strictest possible action - self-tests for new behaviors" [ This is the seccomp part of the security pull request during the merge window that was nixed due to unrelated problems - Linus ] * tag 'seccomp-v4.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: samples: Unrename SECCOMP_RET_KILL selftests/seccomp: Test thread vs process killing seccomp: Implement SECCOMP_RET_KILL_PROCESS action seccomp: Introduce SECCOMP_RET_KILL_PROCESS seccomp: Rename SECCOMP_RET_KILL to SECCOMP_RET_KILL_THREAD seccomp: Action to log before allowing seccomp: Filter flag to log all actions except SECCOMP_RET_ALLOW seccomp: Selftest for detection of filter flag support seccomp: Sysctl to configure actions that are allowed to be logged seccomp: Operation for checking if an action is available seccomp: Sysctl to display available actions seccomp: Provide matching filter for introspection selftests/seccomp: Refactor RET_ERRNO tests selftests/seccomp: Add simple seccomp overhead benchmark selftests/seccomp: Add tests for basic ptrace actions
2854 lines
74 KiB
C
2854 lines
74 KiB
C
/*
|
|
* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
|
|
* Use of this source code is governed by the GPLv2 license.
|
|
*
|
|
* Test code for seccomp bpf.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <asm/siginfo.h>
|
|
#define __have_siginfo_t 1
|
|
#define __have_sigval_t 1
|
|
#define __have_sigevent_t 1
|
|
|
|
#include <errno.h>
|
|
#include <linux/filter.h>
|
|
#include <sys/prctl.h>
|
|
#include <sys/ptrace.h>
|
|
#include <sys/user.h>
|
|
#include <linux/prctl.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/seccomp.h>
|
|
#include <pthread.h>
|
|
#include <semaphore.h>
|
|
#include <signal.h>
|
|
#include <stddef.h>
|
|
#include <stdbool.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
#include <linux/elf.h>
|
|
#include <sys/uio.h>
|
|
#include <sys/utsname.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/times.h>
|
|
|
|
#define _GNU_SOURCE
|
|
#include <unistd.h>
|
|
#include <sys/syscall.h>
|
|
|
|
#include "../kselftest_harness.h"
|
|
|
|
#ifndef PR_SET_PTRACER
|
|
# define PR_SET_PTRACER 0x59616d61
|
|
#endif
|
|
|
|
#ifndef PR_SET_NO_NEW_PRIVS
|
|
#define PR_SET_NO_NEW_PRIVS 38
|
|
#define PR_GET_NO_NEW_PRIVS 39
|
|
#endif
|
|
|
|
#ifndef PR_SECCOMP_EXT
|
|
#define PR_SECCOMP_EXT 43
|
|
#endif
|
|
|
|
#ifndef SECCOMP_EXT_ACT
|
|
#define SECCOMP_EXT_ACT 1
|
|
#endif
|
|
|
|
#ifndef SECCOMP_EXT_ACT_TSYNC
|
|
#define SECCOMP_EXT_ACT_TSYNC 1
|
|
#endif
|
|
|
|
#ifndef SECCOMP_MODE_STRICT
|
|
#define SECCOMP_MODE_STRICT 1
|
|
#endif
|
|
|
|
#ifndef SECCOMP_MODE_FILTER
|
|
#define SECCOMP_MODE_FILTER 2
|
|
#endif
|
|
|
|
#ifndef SECCOMP_RET_ALLOW
|
|
struct seccomp_data {
|
|
int nr;
|
|
__u32 arch;
|
|
__u64 instruction_pointer;
|
|
__u64 args[6];
|
|
};
|
|
#endif
|
|
|
|
#ifndef SECCOMP_RET_KILL_PROCESS
|
|
#define SECCOMP_RET_KILL_PROCESS 0x80000000U /* kill the process */
|
|
#define SECCOMP_RET_KILL_THREAD 0x00000000U /* kill the thread */
|
|
#endif
|
|
#ifndef SECCOMP_RET_KILL
|
|
#define SECCOMP_RET_KILL SECCOMP_RET_KILL_THREAD
|
|
#define SECCOMP_RET_TRAP 0x00030000U /* disallow and force a SIGSYS */
|
|
#define SECCOMP_RET_ERRNO 0x00050000U /* returns an errno */
|
|
#define SECCOMP_RET_TRACE 0x7ff00000U /* pass to a tracer or disallow */
|
|
#define SECCOMP_RET_ALLOW 0x7fff0000U /* allow */
|
|
#endif
|
|
#ifndef SECCOMP_RET_LOG
|
|
#define SECCOMP_RET_LOG 0x7ffc0000U /* allow after logging */
|
|
#endif
|
|
|
|
#ifndef __NR_seccomp
|
|
# if defined(__i386__)
|
|
# define __NR_seccomp 354
|
|
# elif defined(__x86_64__)
|
|
# define __NR_seccomp 317
|
|
# elif defined(__arm__)
|
|
# define __NR_seccomp 383
|
|
# elif defined(__aarch64__)
|
|
# define __NR_seccomp 277
|
|
# elif defined(__hppa__)
|
|
# define __NR_seccomp 338
|
|
# elif defined(__powerpc__)
|
|
# define __NR_seccomp 358
|
|
# elif defined(__s390__)
|
|
# define __NR_seccomp 348
|
|
# else
|
|
# warning "seccomp syscall number unknown for this architecture"
|
|
# define __NR_seccomp 0xffff
|
|
# endif
|
|
#endif
|
|
|
|
#ifndef SECCOMP_SET_MODE_STRICT
|
|
#define SECCOMP_SET_MODE_STRICT 0
|
|
#endif
|
|
|
|
#ifndef SECCOMP_SET_MODE_FILTER
|
|
#define SECCOMP_SET_MODE_FILTER 1
|
|
#endif
|
|
|
|
#ifndef SECCOMP_GET_ACTION_AVAIL
|
|
#define SECCOMP_GET_ACTION_AVAIL 2
|
|
#endif
|
|
|
|
#ifndef SECCOMP_FILTER_FLAG_TSYNC
|
|
#define SECCOMP_FILTER_FLAG_TSYNC 1
|
|
#endif
|
|
|
|
#ifndef SECCOMP_FILTER_FLAG_LOG
|
|
#define SECCOMP_FILTER_FLAG_LOG 2
|
|
#endif
|
|
|
|
#ifndef seccomp
|
|
int seccomp(unsigned int op, unsigned int flags, void *args)
|
|
{
|
|
errno = 0;
|
|
return syscall(__NR_seccomp, op, flags, args);
|
|
}
|
|
#endif
|
|
|
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
|
#define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]))
|
|
#elif __BYTE_ORDER == __BIG_ENDIAN
|
|
#define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]) + sizeof(__u32))
|
|
#else
|
|
#error "wut? Unknown __BYTE_ORDER?!"
|
|
#endif
|
|
|
|
#define SIBLING_EXIT_UNKILLED 0xbadbeef
|
|
#define SIBLING_EXIT_FAILURE 0xbadface
|
|
#define SIBLING_EXIT_NEWPRIVS 0xbadfeed
|
|
|
|
TEST(mode_strict_support)
|
|
{
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL);
|
|
ASSERT_EQ(0, ret) {
|
|
TH_LOG("Kernel does not support CONFIG_SECCOMP");
|
|
}
|
|
syscall(__NR_exit, 0);
|
|
}
|
|
|
|
TEST_SIGNAL(mode_strict_cannot_call_prctl, SIGKILL)
|
|
{
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL);
|
|
ASSERT_EQ(0, ret) {
|
|
TH_LOG("Kernel does not support CONFIG_SECCOMP");
|
|
}
|
|
syscall(__NR_prctl, PR_SET_SECCOMP, SECCOMP_MODE_FILTER,
|
|
NULL, NULL, NULL);
|
|
EXPECT_FALSE(true) {
|
|
TH_LOG("Unreachable!");
|
|
}
|
|
}
|
|
|
|
/* Note! This doesn't test no new privs behavior */
|
|
TEST(no_new_privs_support)
|
|
{
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
EXPECT_EQ(0, ret) {
|
|
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
|
|
}
|
|
}
|
|
|
|
/* Tests kernel support by checking for a copy_from_user() fault on NULL. */
|
|
TEST(mode_filter_support)
|
|
{
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
|
|
ASSERT_EQ(0, ret) {
|
|
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
|
|
}
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, NULL, NULL, NULL);
|
|
EXPECT_EQ(-1, ret);
|
|
EXPECT_EQ(EFAULT, errno) {
|
|
TH_LOG("Kernel does not support CONFIG_SECCOMP_FILTER!");
|
|
}
|
|
}
|
|
|
|
TEST(mode_filter_without_nnp)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
|
|
ret = prctl(PR_GET_NO_NEW_PRIVS, 0, NULL, 0, 0);
|
|
ASSERT_LE(0, ret) {
|
|
TH_LOG("Expected 0 or unsupported for NO_NEW_PRIVS");
|
|
}
|
|
errno = 0;
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
|
|
/* Succeeds with CAP_SYS_ADMIN, fails without */
|
|
/* TODO(wad) check caps not euid */
|
|
if (geteuid()) {
|
|
EXPECT_EQ(-1, ret);
|
|
EXPECT_EQ(EACCES, errno);
|
|
} else {
|
|
EXPECT_EQ(0, ret);
|
|
}
|
|
}
|
|
|
|
#define MAX_INSNS_PER_PATH 32768
|
|
|
|
TEST(filter_size_limits)
|
|
{
|
|
int i;
|
|
int count = BPF_MAXINSNS + 1;
|
|
struct sock_filter allow[] = {
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_filter *filter;
|
|
struct sock_fprog prog = { };
|
|
long ret;
|
|
|
|
filter = calloc(count, sizeof(*filter));
|
|
ASSERT_NE(NULL, filter);
|
|
|
|
for (i = 0; i < count; i++)
|
|
filter[i] = allow[0];
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
prog.filter = filter;
|
|
prog.len = count;
|
|
|
|
/* Too many filter instructions in a single filter. */
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
|
|
ASSERT_NE(0, ret) {
|
|
TH_LOG("Installing %d insn filter was allowed", prog.len);
|
|
}
|
|
|
|
/* One less is okay, though. */
|
|
prog.len -= 1;
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
|
|
ASSERT_EQ(0, ret) {
|
|
TH_LOG("Installing %d insn filter wasn't allowed", prog.len);
|
|
}
|
|
}
|
|
|
|
TEST(filter_chain_limits)
|
|
{
|
|
int i;
|
|
int count = BPF_MAXINSNS;
|
|
struct sock_filter allow[] = {
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_filter *filter;
|
|
struct sock_fprog prog = { };
|
|
long ret;
|
|
|
|
filter = calloc(count, sizeof(*filter));
|
|
ASSERT_NE(NULL, filter);
|
|
|
|
for (i = 0; i < count; i++)
|
|
filter[i] = allow[0];
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
prog.filter = filter;
|
|
prog.len = 1;
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
prog.len = count;
|
|
|
|
/* Too many total filter instructions. */
|
|
for (i = 0; i < MAX_INSNS_PER_PATH; i++) {
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
|
|
if (ret != 0)
|
|
break;
|
|
}
|
|
ASSERT_NE(0, ret) {
|
|
TH_LOG("Allowed %d %d-insn filters (total with penalties:%d)",
|
|
i, count, i * (count + 4));
|
|
}
|
|
}
|
|
|
|
TEST(mode_filter_cannot_move_to_strict)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, 0, 0);
|
|
EXPECT_EQ(-1, ret);
|
|
EXPECT_EQ(EINVAL, errno);
|
|
}
|
|
|
|
|
|
TEST(mode_filter_get_seccomp)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0);
|
|
EXPECT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0);
|
|
EXPECT_EQ(2, ret);
|
|
}
|
|
|
|
|
|
TEST(ALLOW_all)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
|
|
ASSERT_EQ(0, ret);
|
|
}
|
|
|
|
TEST(empty_prog)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
|
|
EXPECT_EQ(-1, ret);
|
|
EXPECT_EQ(EINVAL, errno);
|
|
}
|
|
|
|
TEST(log_all)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_LOG),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
pid_t parent = getppid();
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
/* getppid() should succeed and be logged (no check for logging) */
|
|
EXPECT_EQ(parent, syscall(__NR_getppid));
|
|
}
|
|
|
|
TEST_SIGNAL(unknown_ret_is_kill_inside, SIGSYS)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_RET|BPF_K, 0x10000000U),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
|
|
ASSERT_EQ(0, ret);
|
|
EXPECT_EQ(0, syscall(__NR_getpid)) {
|
|
TH_LOG("getpid() shouldn't ever return");
|
|
}
|
|
}
|
|
|
|
/* return code >= 0x80000000 is unused. */
|
|
TEST_SIGNAL(unknown_ret_is_kill_above_allow, SIGSYS)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_RET|BPF_K, 0x90000000U),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
|
|
ASSERT_EQ(0, ret);
|
|
EXPECT_EQ(0, syscall(__NR_getpid)) {
|
|
TH_LOG("getpid() shouldn't ever return");
|
|
}
|
|
}
|
|
|
|
TEST_SIGNAL(KILL_all, SIGSYS)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
|
|
ASSERT_EQ(0, ret);
|
|
}
|
|
|
|
TEST_SIGNAL(KILL_one, SIGSYS)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
pid_t parent = getppid();
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
EXPECT_EQ(parent, syscall(__NR_getppid));
|
|
/* getpid() should never return. */
|
|
EXPECT_EQ(0, syscall(__NR_getpid));
|
|
}
|
|
|
|
TEST_SIGNAL(KILL_one_arg_one, SIGSYS)
|
|
{
|
|
void *fatal_address;
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_times, 1, 0),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
/* Only both with lower 32-bit for now. */
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(0)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K,
|
|
(unsigned long)&fatal_address, 0, 1),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
pid_t parent = getppid();
|
|
struct tms timebuf;
|
|
clock_t clock = times(&timebuf);
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
EXPECT_EQ(parent, syscall(__NR_getppid));
|
|
EXPECT_LE(clock, syscall(__NR_times, &timebuf));
|
|
/* times() should never return. */
|
|
EXPECT_EQ(0, syscall(__NR_times, &fatal_address));
|
|
}
|
|
|
|
TEST_SIGNAL(KILL_one_arg_six, SIGSYS)
|
|
{
|
|
#ifndef __NR_mmap2
|
|
int sysno = __NR_mmap;
|
|
#else
|
|
int sysno = __NR_mmap2;
|
|
#endif
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, sysno, 1, 0),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
/* Only both with lower 32-bit for now. */
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(5)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0x0C0FFEE, 0, 1),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
pid_t parent = getppid();
|
|
int fd;
|
|
void *map1, *map2;
|
|
int page_size = sysconf(_SC_PAGESIZE);
|
|
|
|
ASSERT_LT(0, page_size);
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
fd = open("/dev/zero", O_RDONLY);
|
|
ASSERT_NE(-1, fd);
|
|
|
|
EXPECT_EQ(parent, syscall(__NR_getppid));
|
|
map1 = (void *)syscall(sysno,
|
|
NULL, page_size, PROT_READ, MAP_PRIVATE, fd, page_size);
|
|
EXPECT_NE(MAP_FAILED, map1);
|
|
/* mmap2() should never return. */
|
|
map2 = (void *)syscall(sysno,
|
|
NULL, page_size, PROT_READ, MAP_PRIVATE, fd, 0x0C0FFEE);
|
|
EXPECT_EQ(MAP_FAILED, map2);
|
|
|
|
/* The test failed, so clean up the resources. */
|
|
munmap(map1, page_size);
|
|
munmap(map2, page_size);
|
|
close(fd);
|
|
}
|
|
|
|
/* This is a thread task to die via seccomp filter violation. */
|
|
void *kill_thread(void *data)
|
|
{
|
|
bool die = (bool)data;
|
|
|
|
if (die) {
|
|
prctl(PR_GET_SECCOMP, 0, 0, 0, 0);
|
|
return (void *)SIBLING_EXIT_FAILURE;
|
|
}
|
|
|
|
return (void *)SIBLING_EXIT_UNKILLED;
|
|
}
|
|
|
|
/* Prepare a thread that will kill itself or both of us. */
|
|
void kill_thread_or_group(struct __test_metadata *_metadata, bool kill_process)
|
|
{
|
|
pthread_t thread;
|
|
void *status;
|
|
/* Kill only when calling __NR_prctl. */
|
|
struct sock_filter filter_thread[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL_THREAD),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog_thread = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter_thread),
|
|
.filter = filter_thread,
|
|
};
|
|
struct sock_filter filter_process[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL_PROCESS),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog_process = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter_process),
|
|
.filter = filter_process,
|
|
};
|
|
|
|
ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
|
|
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
|
|
}
|
|
|
|
ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0,
|
|
kill_process ? &prog_process : &prog_thread));
|
|
|
|
/*
|
|
* Add the KILL_THREAD rule again to make sure that the KILL_PROCESS
|
|
* flag cannot be downgraded by a new filter.
|
|
*/
|
|
ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog_thread));
|
|
|
|
/* Start a thread that will exit immediately. */
|
|
ASSERT_EQ(0, pthread_create(&thread, NULL, kill_thread, (void *)false));
|
|
ASSERT_EQ(0, pthread_join(thread, &status));
|
|
ASSERT_EQ(SIBLING_EXIT_UNKILLED, (unsigned long)status);
|
|
|
|
/* Start a thread that will die immediately. */
|
|
ASSERT_EQ(0, pthread_create(&thread, NULL, kill_thread, (void *)true));
|
|
ASSERT_EQ(0, pthread_join(thread, &status));
|
|
ASSERT_NE(SIBLING_EXIT_FAILURE, (unsigned long)status);
|
|
|
|
/*
|
|
* If we get here, only the spawned thread died. Let the parent know
|
|
* the whole process didn't die (i.e. this thread, the spawner,
|
|
* stayed running).
|
|
*/
|
|
exit(42);
|
|
}
|
|
|
|
TEST(KILL_thread)
|
|
{
|
|
int status;
|
|
pid_t child_pid;
|
|
|
|
child_pid = fork();
|
|
ASSERT_LE(0, child_pid);
|
|
if (child_pid == 0) {
|
|
kill_thread_or_group(_metadata, false);
|
|
_exit(38);
|
|
}
|
|
|
|
ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
|
|
|
|
/* If only the thread was killed, we'll see exit 42. */
|
|
ASSERT_TRUE(WIFEXITED(status));
|
|
ASSERT_EQ(42, WEXITSTATUS(status));
|
|
}
|
|
|
|
TEST(KILL_process)
|
|
{
|
|
int status;
|
|
pid_t child_pid;
|
|
|
|
child_pid = fork();
|
|
ASSERT_LE(0, child_pid);
|
|
if (child_pid == 0) {
|
|
kill_thread_or_group(_metadata, true);
|
|
_exit(38);
|
|
}
|
|
|
|
ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
|
|
|
|
/* If the entire process was killed, we'll see SIGSYS. */
|
|
ASSERT_TRUE(WIFSIGNALED(status));
|
|
ASSERT_EQ(SIGSYS, WTERMSIG(status));
|
|
}
|
|
|
|
/* TODO(wad) add 64-bit versus 32-bit arg tests. */
|
|
TEST(arg_out_of_range)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(6)),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
|
|
EXPECT_EQ(-1, ret);
|
|
EXPECT_EQ(EINVAL, errno);
|
|
}
|
|
|
|
#define ERRNO_FILTER(name, errno) \
|
|
struct sock_filter _read_filter_##name[] = { \
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS, \
|
|
offsetof(struct seccomp_data, nr)), \
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), \
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | errno), \
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), \
|
|
}; \
|
|
struct sock_fprog prog_##name = { \
|
|
.len = (unsigned short)ARRAY_SIZE(_read_filter_##name), \
|
|
.filter = _read_filter_##name, \
|
|
}
|
|
|
|
/* Make sure basic errno values are correctly passed through a filter. */
|
|
TEST(ERRNO_valid)
|
|
{
|
|
ERRNO_FILTER(valid, E2BIG);
|
|
long ret;
|
|
pid_t parent = getppid();
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_valid);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
EXPECT_EQ(parent, syscall(__NR_getppid));
|
|
EXPECT_EQ(-1, read(0, NULL, 0));
|
|
EXPECT_EQ(E2BIG, errno);
|
|
}
|
|
|
|
/* Make sure an errno of zero is correctly handled by the arch code. */
|
|
TEST(ERRNO_zero)
|
|
{
|
|
ERRNO_FILTER(zero, 0);
|
|
long ret;
|
|
pid_t parent = getppid();
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_zero);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
EXPECT_EQ(parent, syscall(__NR_getppid));
|
|
/* "errno" of 0 is ok. */
|
|
EXPECT_EQ(0, read(0, NULL, 0));
|
|
}
|
|
|
|
/*
|
|
* The SECCOMP_RET_DATA mask is 16 bits wide, but errno is smaller.
|
|
* This tests that the errno value gets capped correctly, fixed by
|
|
* 580c57f10768 ("seccomp: cap SECCOMP_RET_ERRNO data to MAX_ERRNO").
|
|
*/
|
|
TEST(ERRNO_capped)
|
|
{
|
|
ERRNO_FILTER(capped, 4096);
|
|
long ret;
|
|
pid_t parent = getppid();
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_capped);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
EXPECT_EQ(parent, syscall(__NR_getppid));
|
|
EXPECT_EQ(-1, read(0, NULL, 0));
|
|
EXPECT_EQ(4095, errno);
|
|
}
|
|
|
|
/*
|
|
* Filters are processed in reverse order: last applied is executed first.
|
|
* Since only the SECCOMP_RET_ACTION mask is tested for return values, the
|
|
* SECCOMP_RET_DATA mask results will follow the most recently applied
|
|
* matching filter return (and not the lowest or highest value).
|
|
*/
|
|
TEST(ERRNO_order)
|
|
{
|
|
ERRNO_FILTER(first, 11);
|
|
ERRNO_FILTER(second, 13);
|
|
ERRNO_FILTER(third, 12);
|
|
long ret;
|
|
pid_t parent = getppid();
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_first);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_second);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_third);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
EXPECT_EQ(parent, syscall(__NR_getppid));
|
|
EXPECT_EQ(-1, read(0, NULL, 0));
|
|
EXPECT_EQ(12, errno);
|
|
}
|
|
|
|
FIXTURE_DATA(TRAP) {
|
|
struct sock_fprog prog;
|
|
};
|
|
|
|
FIXTURE_SETUP(TRAP)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
|
|
memset(&self->prog, 0, sizeof(self->prog));
|
|
self->prog.filter = malloc(sizeof(filter));
|
|
ASSERT_NE(NULL, self->prog.filter);
|
|
memcpy(self->prog.filter, filter, sizeof(filter));
|
|
self->prog.len = (unsigned short)ARRAY_SIZE(filter);
|
|
}
|
|
|
|
FIXTURE_TEARDOWN(TRAP)
|
|
{
|
|
if (self->prog.filter)
|
|
free(self->prog.filter);
|
|
}
|
|
|
|
TEST_F_SIGNAL(TRAP, dfl, SIGSYS)
|
|
{
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
|
|
ASSERT_EQ(0, ret);
|
|
syscall(__NR_getpid);
|
|
}
|
|
|
|
/* Ensure that SIGSYS overrides SIG_IGN */
|
|
TEST_F_SIGNAL(TRAP, ign, SIGSYS)
|
|
{
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
signal(SIGSYS, SIG_IGN);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
|
|
ASSERT_EQ(0, ret);
|
|
syscall(__NR_getpid);
|
|
}
|
|
|
|
static struct siginfo TRAP_info;
|
|
static volatile int TRAP_nr;
|
|
static void TRAP_action(int nr, siginfo_t *info, void *void_context)
|
|
{
|
|
memcpy(&TRAP_info, info, sizeof(TRAP_info));
|
|
TRAP_nr = nr;
|
|
}
|
|
|
|
TEST_F(TRAP, handler)
|
|
{
|
|
int ret, test;
|
|
struct sigaction act;
|
|
sigset_t mask;
|
|
|
|
memset(&act, 0, sizeof(act));
|
|
sigemptyset(&mask);
|
|
sigaddset(&mask, SIGSYS);
|
|
|
|
act.sa_sigaction = &TRAP_action;
|
|
act.sa_flags = SA_SIGINFO;
|
|
ret = sigaction(SIGSYS, &act, NULL);
|
|
ASSERT_EQ(0, ret) {
|
|
TH_LOG("sigaction failed");
|
|
}
|
|
ret = sigprocmask(SIG_UNBLOCK, &mask, NULL);
|
|
ASSERT_EQ(0, ret) {
|
|
TH_LOG("sigprocmask failed");
|
|
}
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
|
|
ASSERT_EQ(0, ret);
|
|
TRAP_nr = 0;
|
|
memset(&TRAP_info, 0, sizeof(TRAP_info));
|
|
/* Expect the registers to be rolled back. (nr = error) may vary
|
|
* based on arch. */
|
|
ret = syscall(__NR_getpid);
|
|
/* Silence gcc warning about volatile. */
|
|
test = TRAP_nr;
|
|
EXPECT_EQ(SIGSYS, test);
|
|
struct local_sigsys {
|
|
void *_call_addr; /* calling user insn */
|
|
int _syscall; /* triggering system call number */
|
|
unsigned int _arch; /* AUDIT_ARCH_* of syscall */
|
|
} *sigsys = (struct local_sigsys *)
|
|
#ifdef si_syscall
|
|
&(TRAP_info.si_call_addr);
|
|
#else
|
|
&TRAP_info.si_pid;
|
|
#endif
|
|
EXPECT_EQ(__NR_getpid, sigsys->_syscall);
|
|
/* Make sure arch is non-zero. */
|
|
EXPECT_NE(0, sigsys->_arch);
|
|
EXPECT_NE(0, (unsigned long)sigsys->_call_addr);
|
|
}
|
|
|
|
FIXTURE_DATA(precedence) {
|
|
struct sock_fprog allow;
|
|
struct sock_fprog log;
|
|
struct sock_fprog trace;
|
|
struct sock_fprog error;
|
|
struct sock_fprog trap;
|
|
struct sock_fprog kill;
|
|
};
|
|
|
|
FIXTURE_SETUP(precedence)
|
|
{
|
|
struct sock_filter allow_insns[] = {
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_filter log_insns[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_LOG),
|
|
};
|
|
struct sock_filter trace_insns[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE),
|
|
};
|
|
struct sock_filter error_insns[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO),
|
|
};
|
|
struct sock_filter trap_insns[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP),
|
|
};
|
|
struct sock_filter kill_insns[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
|
|
};
|
|
|
|
memset(self, 0, sizeof(*self));
|
|
#define FILTER_ALLOC(_x) \
|
|
self->_x.filter = malloc(sizeof(_x##_insns)); \
|
|
ASSERT_NE(NULL, self->_x.filter); \
|
|
memcpy(self->_x.filter, &_x##_insns, sizeof(_x##_insns)); \
|
|
self->_x.len = (unsigned short)ARRAY_SIZE(_x##_insns)
|
|
FILTER_ALLOC(allow);
|
|
FILTER_ALLOC(log);
|
|
FILTER_ALLOC(trace);
|
|
FILTER_ALLOC(error);
|
|
FILTER_ALLOC(trap);
|
|
FILTER_ALLOC(kill);
|
|
}
|
|
|
|
FIXTURE_TEARDOWN(precedence)
|
|
{
|
|
#define FILTER_FREE(_x) if (self->_x.filter) free(self->_x.filter)
|
|
FILTER_FREE(allow);
|
|
FILTER_FREE(log);
|
|
FILTER_FREE(trace);
|
|
FILTER_FREE(error);
|
|
FILTER_FREE(trap);
|
|
FILTER_FREE(kill);
|
|
}
|
|
|
|
TEST_F(precedence, allow_ok)
|
|
{
|
|
pid_t parent, res = 0;
|
|
long ret;
|
|
|
|
parent = getppid();
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
|
|
ASSERT_EQ(0, ret);
|
|
/* Should work just fine. */
|
|
res = syscall(__NR_getppid);
|
|
EXPECT_EQ(parent, res);
|
|
}
|
|
|
|
TEST_F_SIGNAL(precedence, kill_is_highest, SIGSYS)
|
|
{
|
|
pid_t parent, res = 0;
|
|
long ret;
|
|
|
|
parent = getppid();
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
|
|
ASSERT_EQ(0, ret);
|
|
/* Should work just fine. */
|
|
res = syscall(__NR_getppid);
|
|
EXPECT_EQ(parent, res);
|
|
/* getpid() should never return. */
|
|
res = syscall(__NR_getpid);
|
|
EXPECT_EQ(0, res);
|
|
}
|
|
|
|
TEST_F_SIGNAL(precedence, kill_is_highest_in_any_order, SIGSYS)
|
|
{
|
|
pid_t parent;
|
|
long ret;
|
|
|
|
parent = getppid();
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
|
|
ASSERT_EQ(0, ret);
|
|
/* Should work just fine. */
|
|
EXPECT_EQ(parent, syscall(__NR_getppid));
|
|
/* getpid() should never return. */
|
|
EXPECT_EQ(0, syscall(__NR_getpid));
|
|
}
|
|
|
|
TEST_F_SIGNAL(precedence, trap_is_second, SIGSYS)
|
|
{
|
|
pid_t parent;
|
|
long ret;
|
|
|
|
parent = getppid();
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
|
|
ASSERT_EQ(0, ret);
|
|
/* Should work just fine. */
|
|
EXPECT_EQ(parent, syscall(__NR_getppid));
|
|
/* getpid() should never return. */
|
|
EXPECT_EQ(0, syscall(__NR_getpid));
|
|
}
|
|
|
|
TEST_F_SIGNAL(precedence, trap_is_second_in_any_order, SIGSYS)
|
|
{
|
|
pid_t parent;
|
|
long ret;
|
|
|
|
parent = getppid();
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
|
|
ASSERT_EQ(0, ret);
|
|
/* Should work just fine. */
|
|
EXPECT_EQ(parent, syscall(__NR_getppid));
|
|
/* getpid() should never return. */
|
|
EXPECT_EQ(0, syscall(__NR_getpid));
|
|
}
|
|
|
|
TEST_F(precedence, errno_is_third)
|
|
{
|
|
pid_t parent;
|
|
long ret;
|
|
|
|
parent = getppid();
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
|
|
ASSERT_EQ(0, ret);
|
|
/* Should work just fine. */
|
|
EXPECT_EQ(parent, syscall(__NR_getppid));
|
|
EXPECT_EQ(0, syscall(__NR_getpid));
|
|
}
|
|
|
|
TEST_F(precedence, errno_is_third_in_any_order)
|
|
{
|
|
pid_t parent;
|
|
long ret;
|
|
|
|
parent = getppid();
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
|
|
ASSERT_EQ(0, ret);
|
|
/* Should work just fine. */
|
|
EXPECT_EQ(parent, syscall(__NR_getppid));
|
|
EXPECT_EQ(0, syscall(__NR_getpid));
|
|
}
|
|
|
|
TEST_F(precedence, trace_is_fourth)
|
|
{
|
|
pid_t parent;
|
|
long ret;
|
|
|
|
parent = getppid();
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
|
|
ASSERT_EQ(0, ret);
|
|
/* Should work just fine. */
|
|
EXPECT_EQ(parent, syscall(__NR_getppid));
|
|
/* No ptracer */
|
|
EXPECT_EQ(-1, syscall(__NR_getpid));
|
|
}
|
|
|
|
TEST_F(precedence, trace_is_fourth_in_any_order)
|
|
{
|
|
pid_t parent;
|
|
long ret;
|
|
|
|
parent = getppid();
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
|
|
ASSERT_EQ(0, ret);
|
|
/* Should work just fine. */
|
|
EXPECT_EQ(parent, syscall(__NR_getppid));
|
|
/* No ptracer */
|
|
EXPECT_EQ(-1, syscall(__NR_getpid));
|
|
}
|
|
|
|
TEST_F(precedence, log_is_fifth)
|
|
{
|
|
pid_t mypid, parent;
|
|
long ret;
|
|
|
|
mypid = getpid();
|
|
parent = getppid();
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
|
|
ASSERT_EQ(0, ret);
|
|
/* Should work just fine. */
|
|
EXPECT_EQ(parent, syscall(__NR_getppid));
|
|
/* Should also work just fine */
|
|
EXPECT_EQ(mypid, syscall(__NR_getpid));
|
|
}
|
|
|
|
TEST_F(precedence, log_is_fifth_in_any_order)
|
|
{
|
|
pid_t mypid, parent;
|
|
long ret;
|
|
|
|
mypid = getpid();
|
|
parent = getppid();
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
|
|
ASSERT_EQ(0, ret);
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
|
|
ASSERT_EQ(0, ret);
|
|
/* Should work just fine. */
|
|
EXPECT_EQ(parent, syscall(__NR_getppid));
|
|
/* Should also work just fine */
|
|
EXPECT_EQ(mypid, syscall(__NR_getpid));
|
|
}
|
|
|
|
#ifndef PTRACE_O_TRACESECCOMP
|
|
#define PTRACE_O_TRACESECCOMP 0x00000080
|
|
#endif
|
|
|
|
/* Catch the Ubuntu 12.04 value error. */
|
|
#if PTRACE_EVENT_SECCOMP != 7
|
|
#undef PTRACE_EVENT_SECCOMP
|
|
#endif
|
|
|
|
#ifndef PTRACE_EVENT_SECCOMP
|
|
#define PTRACE_EVENT_SECCOMP 7
|
|
#endif
|
|
|
|
#define IS_SECCOMP_EVENT(status) ((status >> 16) == PTRACE_EVENT_SECCOMP)
|
|
bool tracer_running;
|
|
void tracer_stop(int sig)
|
|
{
|
|
tracer_running = false;
|
|
}
|
|
|
|
typedef void tracer_func_t(struct __test_metadata *_metadata,
|
|
pid_t tracee, int status, void *args);
|
|
|
|
void start_tracer(struct __test_metadata *_metadata, int fd, pid_t tracee,
|
|
tracer_func_t tracer_func, void *args, bool ptrace_syscall)
|
|
{
|
|
int ret = -1;
|
|
struct sigaction action = {
|
|
.sa_handler = tracer_stop,
|
|
};
|
|
|
|
/* Allow external shutdown. */
|
|
tracer_running = true;
|
|
ASSERT_EQ(0, sigaction(SIGUSR1, &action, NULL));
|
|
|
|
errno = 0;
|
|
while (ret == -1 && errno != EINVAL)
|
|
ret = ptrace(PTRACE_ATTACH, tracee, NULL, 0);
|
|
ASSERT_EQ(0, ret) {
|
|
kill(tracee, SIGKILL);
|
|
}
|
|
/* Wait for attach stop */
|
|
wait(NULL);
|
|
|
|
ret = ptrace(PTRACE_SETOPTIONS, tracee, NULL, ptrace_syscall ?
|
|
PTRACE_O_TRACESYSGOOD :
|
|
PTRACE_O_TRACESECCOMP);
|
|
ASSERT_EQ(0, ret) {
|
|
TH_LOG("Failed to set PTRACE_O_TRACESECCOMP");
|
|
kill(tracee, SIGKILL);
|
|
}
|
|
ret = ptrace(ptrace_syscall ? PTRACE_SYSCALL : PTRACE_CONT,
|
|
tracee, NULL, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
/* Unblock the tracee */
|
|
ASSERT_EQ(1, write(fd, "A", 1));
|
|
ASSERT_EQ(0, close(fd));
|
|
|
|
/* Run until we're shut down. Must assert to stop execution. */
|
|
while (tracer_running) {
|
|
int status;
|
|
|
|
if (wait(&status) != tracee)
|
|
continue;
|
|
if (WIFSIGNALED(status) || WIFEXITED(status))
|
|
/* Child is dead. Time to go. */
|
|
return;
|
|
|
|
/* Check if this is a seccomp event. */
|
|
ASSERT_EQ(!ptrace_syscall, IS_SECCOMP_EVENT(status));
|
|
|
|
tracer_func(_metadata, tracee, status, args);
|
|
|
|
ret = ptrace(ptrace_syscall ? PTRACE_SYSCALL : PTRACE_CONT,
|
|
tracee, NULL, 0);
|
|
ASSERT_EQ(0, ret);
|
|
}
|
|
/* Directly report the status of our test harness results. */
|
|
syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE);
|
|
}
|
|
|
|
/* Common tracer setup/teardown functions. */
|
|
void cont_handler(int num)
|
|
{ }
|
|
pid_t setup_trace_fixture(struct __test_metadata *_metadata,
|
|
tracer_func_t func, void *args, bool ptrace_syscall)
|
|
{
|
|
char sync;
|
|
int pipefd[2];
|
|
pid_t tracer_pid;
|
|
pid_t tracee = getpid();
|
|
|
|
/* Setup a pipe for clean synchronization. */
|
|
ASSERT_EQ(0, pipe(pipefd));
|
|
|
|
/* Fork a child which we'll promote to tracer */
|
|
tracer_pid = fork();
|
|
ASSERT_LE(0, tracer_pid);
|
|
signal(SIGALRM, cont_handler);
|
|
if (tracer_pid == 0) {
|
|
close(pipefd[0]);
|
|
start_tracer(_metadata, pipefd[1], tracee, func, args,
|
|
ptrace_syscall);
|
|
syscall(__NR_exit, 0);
|
|
}
|
|
close(pipefd[1]);
|
|
prctl(PR_SET_PTRACER, tracer_pid, 0, 0, 0);
|
|
read(pipefd[0], &sync, 1);
|
|
close(pipefd[0]);
|
|
|
|
return tracer_pid;
|
|
}
|
|
void teardown_trace_fixture(struct __test_metadata *_metadata,
|
|
pid_t tracer)
|
|
{
|
|
if (tracer) {
|
|
int status;
|
|
/*
|
|
* Extract the exit code from the other process and
|
|
* adopt it for ourselves in case its asserts failed.
|
|
*/
|
|
ASSERT_EQ(0, kill(tracer, SIGUSR1));
|
|
ASSERT_EQ(tracer, waitpid(tracer, &status, 0));
|
|
if (WEXITSTATUS(status))
|
|
_metadata->passed = 0;
|
|
}
|
|
}
|
|
|
|
/* "poke" tracer arguments and function. */
|
|
struct tracer_args_poke_t {
|
|
unsigned long poke_addr;
|
|
};
|
|
|
|
void tracer_poke(struct __test_metadata *_metadata, pid_t tracee, int status,
|
|
void *args)
|
|
{
|
|
int ret;
|
|
unsigned long msg;
|
|
struct tracer_args_poke_t *info = (struct tracer_args_poke_t *)args;
|
|
|
|
ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
|
|
EXPECT_EQ(0, ret);
|
|
/* If this fails, don't try to recover. */
|
|
ASSERT_EQ(0x1001, msg) {
|
|
kill(tracee, SIGKILL);
|
|
}
|
|
/*
|
|
* Poke in the message.
|
|
* Registers are not touched to try to keep this relatively arch
|
|
* agnostic.
|
|
*/
|
|
ret = ptrace(PTRACE_POKEDATA, tracee, info->poke_addr, 0x1001);
|
|
EXPECT_EQ(0, ret);
|
|
}
|
|
|
|
FIXTURE_DATA(TRACE_poke) {
|
|
struct sock_fprog prog;
|
|
pid_t tracer;
|
|
long poked;
|
|
struct tracer_args_poke_t tracer_args;
|
|
};
|
|
|
|
FIXTURE_SETUP(TRACE_poke)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1001),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
|
|
self->poked = 0;
|
|
memset(&self->prog, 0, sizeof(self->prog));
|
|
self->prog.filter = malloc(sizeof(filter));
|
|
ASSERT_NE(NULL, self->prog.filter);
|
|
memcpy(self->prog.filter, filter, sizeof(filter));
|
|
self->prog.len = (unsigned short)ARRAY_SIZE(filter);
|
|
|
|
/* Set up tracer args. */
|
|
self->tracer_args.poke_addr = (unsigned long)&self->poked;
|
|
|
|
/* Launch tracer. */
|
|
self->tracer = setup_trace_fixture(_metadata, tracer_poke,
|
|
&self->tracer_args, false);
|
|
}
|
|
|
|
FIXTURE_TEARDOWN(TRACE_poke)
|
|
{
|
|
teardown_trace_fixture(_metadata, self->tracer);
|
|
if (self->prog.filter)
|
|
free(self->prog.filter);
|
|
}
|
|
|
|
TEST_F(TRACE_poke, read_has_side_effects)
|
|
{
|
|
ssize_t ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
EXPECT_EQ(0, self->poked);
|
|
ret = read(-1, NULL, 0);
|
|
EXPECT_EQ(-1, ret);
|
|
EXPECT_EQ(0x1001, self->poked);
|
|
}
|
|
|
|
TEST_F(TRACE_poke, getpid_runs_normally)
|
|
{
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
EXPECT_EQ(0, self->poked);
|
|
EXPECT_NE(0, syscall(__NR_getpid));
|
|
EXPECT_EQ(0, self->poked);
|
|
}
|
|
|
|
#if defined(__x86_64__)
|
|
# define ARCH_REGS struct user_regs_struct
|
|
# define SYSCALL_NUM orig_rax
|
|
# define SYSCALL_RET rax
|
|
#elif defined(__i386__)
|
|
# define ARCH_REGS struct user_regs_struct
|
|
# define SYSCALL_NUM orig_eax
|
|
# define SYSCALL_RET eax
|
|
#elif defined(__arm__)
|
|
# define ARCH_REGS struct pt_regs
|
|
# define SYSCALL_NUM ARM_r7
|
|
# define SYSCALL_RET ARM_r0
|
|
#elif defined(__aarch64__)
|
|
# define ARCH_REGS struct user_pt_regs
|
|
# define SYSCALL_NUM regs[8]
|
|
# define SYSCALL_RET regs[0]
|
|
#elif defined(__hppa__)
|
|
# define ARCH_REGS struct user_regs_struct
|
|
# define SYSCALL_NUM gr[20]
|
|
# define SYSCALL_RET gr[28]
|
|
#elif defined(__powerpc__)
|
|
# define ARCH_REGS struct pt_regs
|
|
# define SYSCALL_NUM gpr[0]
|
|
# define SYSCALL_RET gpr[3]
|
|
#elif defined(__s390__)
|
|
# define ARCH_REGS s390_regs
|
|
# define SYSCALL_NUM gprs[2]
|
|
# define SYSCALL_RET gprs[2]
|
|
#elif defined(__mips__)
|
|
# define ARCH_REGS struct pt_regs
|
|
# define SYSCALL_NUM regs[2]
|
|
# define SYSCALL_SYSCALL_NUM regs[4]
|
|
# define SYSCALL_RET regs[2]
|
|
# define SYSCALL_NUM_RET_SHARE_REG
|
|
#else
|
|
# error "Do not know how to find your architecture's registers and syscalls"
|
|
#endif
|
|
|
|
/* When the syscall return can't be changed, stub out the tests for it. */
|
|
#ifdef SYSCALL_NUM_RET_SHARE_REG
|
|
# define EXPECT_SYSCALL_RETURN(val, action) EXPECT_EQ(-1, action)
|
|
#else
|
|
# define EXPECT_SYSCALL_RETURN(val, action) EXPECT_EQ(val, action)
|
|
#endif
|
|
|
|
/* Use PTRACE_GETREGS and PTRACE_SETREGS when available. This is useful for
|
|
* architectures without HAVE_ARCH_TRACEHOOK (e.g. User-mode Linux).
|
|
*/
|
|
#if defined(__x86_64__) || defined(__i386__) || defined(__mips__)
|
|
#define HAVE_GETREGS
|
|
#endif
|
|
|
|
/* Architecture-specific syscall fetching routine. */
|
|
int get_syscall(struct __test_metadata *_metadata, pid_t tracee)
|
|
{
|
|
ARCH_REGS regs;
|
|
#ifdef HAVE_GETREGS
|
|
EXPECT_EQ(0, ptrace(PTRACE_GETREGS, tracee, 0, ®s)) {
|
|
TH_LOG("PTRACE_GETREGS failed");
|
|
return -1;
|
|
}
|
|
#else
|
|
struct iovec iov;
|
|
|
|
iov.iov_base = ®s;
|
|
iov.iov_len = sizeof(regs);
|
|
EXPECT_EQ(0, ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov)) {
|
|
TH_LOG("PTRACE_GETREGSET failed");
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
#if defined(__mips__)
|
|
if (regs.SYSCALL_NUM == __NR_O32_Linux)
|
|
return regs.SYSCALL_SYSCALL_NUM;
|
|
#endif
|
|
return regs.SYSCALL_NUM;
|
|
}
|
|
|
|
/* Architecture-specific syscall changing routine. */
|
|
void change_syscall(struct __test_metadata *_metadata,
|
|
pid_t tracee, int syscall)
|
|
{
|
|
int ret;
|
|
ARCH_REGS regs;
|
|
#ifdef HAVE_GETREGS
|
|
ret = ptrace(PTRACE_GETREGS, tracee, 0, ®s);
|
|
#else
|
|
struct iovec iov;
|
|
iov.iov_base = ®s;
|
|
iov.iov_len = sizeof(regs);
|
|
ret = ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov);
|
|
#endif
|
|
EXPECT_EQ(0, ret) {}
|
|
|
|
#if defined(__x86_64__) || defined(__i386__) || defined(__powerpc__) || \
|
|
defined(__s390__) || defined(__hppa__)
|
|
{
|
|
regs.SYSCALL_NUM = syscall;
|
|
}
|
|
#elif defined(__mips__)
|
|
{
|
|
if (regs.SYSCALL_NUM == __NR_O32_Linux)
|
|
regs.SYSCALL_SYSCALL_NUM = syscall;
|
|
else
|
|
regs.SYSCALL_NUM = syscall;
|
|
}
|
|
|
|
#elif defined(__arm__)
|
|
# ifndef PTRACE_SET_SYSCALL
|
|
# define PTRACE_SET_SYSCALL 23
|
|
# endif
|
|
{
|
|
ret = ptrace(PTRACE_SET_SYSCALL, tracee, NULL, syscall);
|
|
EXPECT_EQ(0, ret);
|
|
}
|
|
|
|
#elif defined(__aarch64__)
|
|
# ifndef NT_ARM_SYSTEM_CALL
|
|
# define NT_ARM_SYSTEM_CALL 0x404
|
|
# endif
|
|
{
|
|
iov.iov_base = &syscall;
|
|
iov.iov_len = sizeof(syscall);
|
|
ret = ptrace(PTRACE_SETREGSET, tracee, NT_ARM_SYSTEM_CALL,
|
|
&iov);
|
|
EXPECT_EQ(0, ret);
|
|
}
|
|
|
|
#else
|
|
ASSERT_EQ(1, 0) {
|
|
TH_LOG("How is the syscall changed on this architecture?");
|
|
}
|
|
#endif
|
|
|
|
/* If syscall is skipped, change return value. */
|
|
if (syscall == -1)
|
|
#ifdef SYSCALL_NUM_RET_SHARE_REG
|
|
TH_LOG("Can't modify syscall return on this architecture");
|
|
#else
|
|
regs.SYSCALL_RET = EPERM;
|
|
#endif
|
|
|
|
#ifdef HAVE_GETREGS
|
|
ret = ptrace(PTRACE_SETREGS, tracee, 0, ®s);
|
|
#else
|
|
iov.iov_base = ®s;
|
|
iov.iov_len = sizeof(regs);
|
|
ret = ptrace(PTRACE_SETREGSET, tracee, NT_PRSTATUS, &iov);
|
|
#endif
|
|
EXPECT_EQ(0, ret);
|
|
}
|
|
|
|
void tracer_syscall(struct __test_metadata *_metadata, pid_t tracee,
|
|
int status, void *args)
|
|
{
|
|
int ret;
|
|
unsigned long msg;
|
|
|
|
/* Make sure we got the right message. */
|
|
ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
|
|
EXPECT_EQ(0, ret);
|
|
|
|
/* Validate and take action on expected syscalls. */
|
|
switch (msg) {
|
|
case 0x1002:
|
|
/* change getpid to getppid. */
|
|
EXPECT_EQ(__NR_getpid, get_syscall(_metadata, tracee));
|
|
change_syscall(_metadata, tracee, __NR_getppid);
|
|
break;
|
|
case 0x1003:
|
|
/* skip gettid. */
|
|
EXPECT_EQ(__NR_gettid, get_syscall(_metadata, tracee));
|
|
change_syscall(_metadata, tracee, -1);
|
|
break;
|
|
case 0x1004:
|
|
/* do nothing (allow getppid) */
|
|
EXPECT_EQ(__NR_getppid, get_syscall(_metadata, tracee));
|
|
break;
|
|
default:
|
|
EXPECT_EQ(0, msg) {
|
|
TH_LOG("Unknown PTRACE_GETEVENTMSG: 0x%lx", msg);
|
|
kill(tracee, SIGKILL);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
void tracer_ptrace(struct __test_metadata *_metadata, pid_t tracee,
|
|
int status, void *args)
|
|
{
|
|
int ret, nr;
|
|
unsigned long msg;
|
|
static bool entry;
|
|
|
|
/* Make sure we got an empty message. */
|
|
ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
|
|
EXPECT_EQ(0, ret);
|
|
EXPECT_EQ(0, msg);
|
|
|
|
/* The only way to tell PTRACE_SYSCALL entry/exit is by counting. */
|
|
entry = !entry;
|
|
if (!entry)
|
|
return;
|
|
|
|
nr = get_syscall(_metadata, tracee);
|
|
|
|
if (nr == __NR_getpid)
|
|
change_syscall(_metadata, tracee, __NR_getppid);
|
|
if (nr == __NR_open)
|
|
change_syscall(_metadata, tracee, -1);
|
|
}
|
|
|
|
FIXTURE_DATA(TRACE_syscall) {
|
|
struct sock_fprog prog;
|
|
pid_t tracer, mytid, mypid, parent;
|
|
};
|
|
|
|
FIXTURE_SETUP(TRACE_syscall)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1002),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_gettid, 0, 1),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1003),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1004),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
|
|
memset(&self->prog, 0, sizeof(self->prog));
|
|
self->prog.filter = malloc(sizeof(filter));
|
|
ASSERT_NE(NULL, self->prog.filter);
|
|
memcpy(self->prog.filter, filter, sizeof(filter));
|
|
self->prog.len = (unsigned short)ARRAY_SIZE(filter);
|
|
|
|
/* Prepare some testable syscall results. */
|
|
self->mytid = syscall(__NR_gettid);
|
|
ASSERT_GT(self->mytid, 0);
|
|
ASSERT_NE(self->mytid, 1) {
|
|
TH_LOG("Running this test as init is not supported. :)");
|
|
}
|
|
|
|
self->mypid = getpid();
|
|
ASSERT_GT(self->mypid, 0);
|
|
ASSERT_EQ(self->mytid, self->mypid);
|
|
|
|
self->parent = getppid();
|
|
ASSERT_GT(self->parent, 0);
|
|
ASSERT_NE(self->parent, self->mypid);
|
|
|
|
/* Launch tracer. */
|
|
self->tracer = setup_trace_fixture(_metadata, tracer_syscall, NULL,
|
|
false);
|
|
}
|
|
|
|
FIXTURE_TEARDOWN(TRACE_syscall)
|
|
{
|
|
teardown_trace_fixture(_metadata, self->tracer);
|
|
if (self->prog.filter)
|
|
free(self->prog.filter);
|
|
}
|
|
|
|
TEST_F(TRACE_syscall, ptrace_syscall_redirected)
|
|
{
|
|
/* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
|
|
teardown_trace_fixture(_metadata, self->tracer);
|
|
self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
|
|
true);
|
|
|
|
/* Tracer will redirect getpid to getppid. */
|
|
EXPECT_NE(self->mypid, syscall(__NR_getpid));
|
|
}
|
|
|
|
TEST_F(TRACE_syscall, ptrace_syscall_dropped)
|
|
{
|
|
/* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
|
|
teardown_trace_fixture(_metadata, self->tracer);
|
|
self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
|
|
true);
|
|
|
|
/* Tracer should skip the open syscall, resulting in EPERM. */
|
|
EXPECT_SYSCALL_RETURN(EPERM, syscall(__NR_open));
|
|
}
|
|
|
|
TEST_F(TRACE_syscall, syscall_allowed)
|
|
{
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
/* getppid works as expected (no changes). */
|
|
EXPECT_EQ(self->parent, syscall(__NR_getppid));
|
|
EXPECT_NE(self->mypid, syscall(__NR_getppid));
|
|
}
|
|
|
|
TEST_F(TRACE_syscall, syscall_redirected)
|
|
{
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
/* getpid has been redirected to getppid as expected. */
|
|
EXPECT_EQ(self->parent, syscall(__NR_getpid));
|
|
EXPECT_NE(self->mypid, syscall(__NR_getpid));
|
|
}
|
|
|
|
TEST_F(TRACE_syscall, syscall_dropped)
|
|
{
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
/* gettid has been skipped and an altered return value stored. */
|
|
EXPECT_SYSCALL_RETURN(EPERM, syscall(__NR_gettid));
|
|
EXPECT_NE(self->mytid, syscall(__NR_gettid));
|
|
}
|
|
|
|
TEST_F(TRACE_syscall, skip_after_RET_TRACE)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EPERM),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
/* Install fixture filter. */
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
/* Install "errno on getppid" filter. */
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
/* Tracer will redirect getpid to getppid, and we should see EPERM. */
|
|
errno = 0;
|
|
EXPECT_EQ(-1, syscall(__NR_getpid));
|
|
EXPECT_EQ(EPERM, errno);
|
|
}
|
|
|
|
TEST_F_SIGNAL(TRACE_syscall, kill_after_RET_TRACE, SIGSYS)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
/* Install fixture filter. */
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
/* Install "death on getppid" filter. */
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
/* Tracer will redirect getpid to getppid, and we should die. */
|
|
EXPECT_NE(self->mypid, syscall(__NR_getpid));
|
|
}
|
|
|
|
TEST_F(TRACE_syscall, skip_after_ptrace)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EPERM),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
|
|
/* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
|
|
teardown_trace_fixture(_metadata, self->tracer);
|
|
self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
|
|
true);
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
/* Install "errno on getppid" filter. */
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
/* Tracer will redirect getpid to getppid, and we should see EPERM. */
|
|
EXPECT_EQ(-1, syscall(__NR_getpid));
|
|
EXPECT_EQ(EPERM, errno);
|
|
}
|
|
|
|
TEST_F_SIGNAL(TRACE_syscall, kill_after_ptrace, SIGSYS)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
|
|
/* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
|
|
teardown_trace_fixture(_metadata, self->tracer);
|
|
self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
|
|
true);
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
/* Install "death on getppid" filter. */
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
/* Tracer will redirect getpid to getppid, and we should die. */
|
|
EXPECT_NE(self->mypid, syscall(__NR_getpid));
|
|
}
|
|
|
|
TEST(seccomp_syscall)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret) {
|
|
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
|
|
}
|
|
|
|
/* Reject insane operation. */
|
|
ret = seccomp(-1, 0, &prog);
|
|
ASSERT_NE(ENOSYS, errno) {
|
|
TH_LOG("Kernel does not support seccomp syscall!");
|
|
}
|
|
EXPECT_EQ(EINVAL, errno) {
|
|
TH_LOG("Did not reject crazy op value!");
|
|
}
|
|
|
|
/* Reject strict with flags or pointer. */
|
|
ret = seccomp(SECCOMP_SET_MODE_STRICT, -1, NULL);
|
|
EXPECT_EQ(EINVAL, errno) {
|
|
TH_LOG("Did not reject mode strict with flags!");
|
|
}
|
|
ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, &prog);
|
|
EXPECT_EQ(EINVAL, errno) {
|
|
TH_LOG("Did not reject mode strict with uargs!");
|
|
}
|
|
|
|
/* Reject insane args for filter. */
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, -1, &prog);
|
|
EXPECT_EQ(EINVAL, errno) {
|
|
TH_LOG("Did not reject crazy filter flags!");
|
|
}
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, NULL);
|
|
EXPECT_EQ(EFAULT, errno) {
|
|
TH_LOG("Did not reject NULL filter!");
|
|
}
|
|
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
|
|
EXPECT_EQ(0, errno) {
|
|
TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER: %s",
|
|
strerror(errno));
|
|
}
|
|
}
|
|
|
|
TEST(seccomp_syscall_mode_lock)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
|
|
ASSERT_EQ(0, ret) {
|
|
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
|
|
}
|
|
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
|
|
ASSERT_NE(ENOSYS, errno) {
|
|
TH_LOG("Kernel does not support seccomp syscall!");
|
|
}
|
|
EXPECT_EQ(0, ret) {
|
|
TH_LOG("Could not install filter!");
|
|
}
|
|
|
|
/* Make sure neither entry point will switch to strict. */
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, 0, 0, 0);
|
|
EXPECT_EQ(EINVAL, errno) {
|
|
TH_LOG("Switched to mode strict!");
|
|
}
|
|
|
|
ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, NULL);
|
|
EXPECT_EQ(EINVAL, errno) {
|
|
TH_LOG("Switched to mode strict!");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Test detection of known and unknown filter flags. Userspace needs to be able
|
|
* to check if a filter flag is supported by the current kernel and a good way
|
|
* of doing that is by attempting to enter filter mode, with the flag bit in
|
|
* question set, and a NULL pointer for the _args_ parameter. EFAULT indicates
|
|
* that the flag is valid and EINVAL indicates that the flag is invalid.
|
|
*/
|
|
TEST(detect_seccomp_filter_flags)
|
|
{
|
|
unsigned int flags[] = { SECCOMP_FILTER_FLAG_TSYNC,
|
|
SECCOMP_FILTER_FLAG_LOG };
|
|
unsigned int flag, all_flags;
|
|
int i;
|
|
long ret;
|
|
|
|
/* Test detection of known-good filter flags */
|
|
for (i = 0, all_flags = 0; i < ARRAY_SIZE(flags); i++) {
|
|
flag = flags[i];
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
|
|
ASSERT_NE(ENOSYS, errno) {
|
|
TH_LOG("Kernel does not support seccomp syscall!");
|
|
}
|
|
EXPECT_EQ(-1, ret);
|
|
EXPECT_EQ(EFAULT, errno) {
|
|
TH_LOG("Failed to detect that a known-good filter flag (0x%X) is supported!",
|
|
flag);
|
|
}
|
|
|
|
all_flags |= flag;
|
|
}
|
|
|
|
/* Test detection of all known-good filter flags */
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, all_flags, NULL);
|
|
EXPECT_EQ(-1, ret);
|
|
EXPECT_EQ(EFAULT, errno) {
|
|
TH_LOG("Failed to detect that all known-good filter flags (0x%X) are supported!",
|
|
all_flags);
|
|
}
|
|
|
|
/* Test detection of an unknown filter flag */
|
|
flag = -1;
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
|
|
EXPECT_EQ(-1, ret);
|
|
EXPECT_EQ(EINVAL, errno) {
|
|
TH_LOG("Failed to detect that an unknown filter flag (0x%X) is unsupported!",
|
|
flag);
|
|
}
|
|
|
|
/*
|
|
* Test detection of an unknown filter flag that may simply need to be
|
|
* added to this test
|
|
*/
|
|
flag = flags[ARRAY_SIZE(flags) - 1] << 1;
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
|
|
EXPECT_EQ(-1, ret);
|
|
EXPECT_EQ(EINVAL, errno) {
|
|
TH_LOG("Failed to detect that an unknown filter flag (0x%X) is unsupported! Does a new flag need to be added to this test?",
|
|
flag);
|
|
}
|
|
}
|
|
|
|
TEST(TSYNC_first)
|
|
{
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
long ret;
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
|
|
ASSERT_EQ(0, ret) {
|
|
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
|
|
}
|
|
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
|
|
&prog);
|
|
ASSERT_NE(ENOSYS, errno) {
|
|
TH_LOG("Kernel does not support seccomp syscall!");
|
|
}
|
|
EXPECT_EQ(0, ret) {
|
|
TH_LOG("Could not install initial filter with TSYNC!");
|
|
}
|
|
}
|
|
|
|
#define TSYNC_SIBLINGS 2
|
|
struct tsync_sibling {
|
|
pthread_t tid;
|
|
pid_t system_tid;
|
|
sem_t *started;
|
|
pthread_cond_t *cond;
|
|
pthread_mutex_t *mutex;
|
|
int diverge;
|
|
int num_waits;
|
|
struct sock_fprog *prog;
|
|
struct __test_metadata *metadata;
|
|
};
|
|
|
|
/*
|
|
* To avoid joining joined threads (which is not allowed by Bionic),
|
|
* make sure we both successfully join and clear the tid to skip a
|
|
* later join attempt during fixture teardown. Any remaining threads
|
|
* will be directly killed during teardown.
|
|
*/
|
|
#define PTHREAD_JOIN(tid, status) \
|
|
do { \
|
|
int _rc = pthread_join(tid, status); \
|
|
if (_rc) { \
|
|
TH_LOG("pthread_join of tid %u failed: %d\n", \
|
|
(unsigned int)tid, _rc); \
|
|
} else { \
|
|
tid = 0; \
|
|
} \
|
|
} while (0)
|
|
|
|
FIXTURE_DATA(TSYNC) {
|
|
struct sock_fprog root_prog, apply_prog;
|
|
struct tsync_sibling sibling[TSYNC_SIBLINGS];
|
|
sem_t started;
|
|
pthread_cond_t cond;
|
|
pthread_mutex_t mutex;
|
|
int sibling_count;
|
|
};
|
|
|
|
FIXTURE_SETUP(TSYNC)
|
|
{
|
|
struct sock_filter root_filter[] = {
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_filter apply_filter[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
|
|
memset(&self->root_prog, 0, sizeof(self->root_prog));
|
|
memset(&self->apply_prog, 0, sizeof(self->apply_prog));
|
|
memset(&self->sibling, 0, sizeof(self->sibling));
|
|
self->root_prog.filter = malloc(sizeof(root_filter));
|
|
ASSERT_NE(NULL, self->root_prog.filter);
|
|
memcpy(self->root_prog.filter, &root_filter, sizeof(root_filter));
|
|
self->root_prog.len = (unsigned short)ARRAY_SIZE(root_filter);
|
|
|
|
self->apply_prog.filter = malloc(sizeof(apply_filter));
|
|
ASSERT_NE(NULL, self->apply_prog.filter);
|
|
memcpy(self->apply_prog.filter, &apply_filter, sizeof(apply_filter));
|
|
self->apply_prog.len = (unsigned short)ARRAY_SIZE(apply_filter);
|
|
|
|
self->sibling_count = 0;
|
|
pthread_mutex_init(&self->mutex, NULL);
|
|
pthread_cond_init(&self->cond, NULL);
|
|
sem_init(&self->started, 0, 0);
|
|
self->sibling[0].tid = 0;
|
|
self->sibling[0].cond = &self->cond;
|
|
self->sibling[0].started = &self->started;
|
|
self->sibling[0].mutex = &self->mutex;
|
|
self->sibling[0].diverge = 0;
|
|
self->sibling[0].num_waits = 1;
|
|
self->sibling[0].prog = &self->root_prog;
|
|
self->sibling[0].metadata = _metadata;
|
|
self->sibling[1].tid = 0;
|
|
self->sibling[1].cond = &self->cond;
|
|
self->sibling[1].started = &self->started;
|
|
self->sibling[1].mutex = &self->mutex;
|
|
self->sibling[1].diverge = 0;
|
|
self->sibling[1].prog = &self->root_prog;
|
|
self->sibling[1].num_waits = 1;
|
|
self->sibling[1].metadata = _metadata;
|
|
}
|
|
|
|
FIXTURE_TEARDOWN(TSYNC)
|
|
{
|
|
int sib = 0;
|
|
|
|
if (self->root_prog.filter)
|
|
free(self->root_prog.filter);
|
|
if (self->apply_prog.filter)
|
|
free(self->apply_prog.filter);
|
|
|
|
for ( ; sib < self->sibling_count; ++sib) {
|
|
struct tsync_sibling *s = &self->sibling[sib];
|
|
|
|
if (!s->tid)
|
|
continue;
|
|
/*
|
|
* If a thread is still running, it may be stuck, so hit
|
|
* it over the head really hard.
|
|
*/
|
|
pthread_kill(s->tid, 9);
|
|
}
|
|
pthread_mutex_destroy(&self->mutex);
|
|
pthread_cond_destroy(&self->cond);
|
|
sem_destroy(&self->started);
|
|
}
|
|
|
|
void *tsync_sibling(void *data)
|
|
{
|
|
long ret = 0;
|
|
struct tsync_sibling *me = data;
|
|
|
|
me->system_tid = syscall(__NR_gettid);
|
|
|
|
pthread_mutex_lock(me->mutex);
|
|
if (me->diverge) {
|
|
/* Just re-apply the root prog to fork the tree */
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER,
|
|
me->prog, 0, 0);
|
|
}
|
|
sem_post(me->started);
|
|
/* Return outside of started so parent notices failures. */
|
|
if (ret) {
|
|
pthread_mutex_unlock(me->mutex);
|
|
return (void *)SIBLING_EXIT_FAILURE;
|
|
}
|
|
do {
|
|
pthread_cond_wait(me->cond, me->mutex);
|
|
me->num_waits = me->num_waits - 1;
|
|
} while (me->num_waits);
|
|
pthread_mutex_unlock(me->mutex);
|
|
|
|
ret = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0);
|
|
if (!ret)
|
|
return (void *)SIBLING_EXIT_NEWPRIVS;
|
|
read(0, NULL, 0);
|
|
return (void *)SIBLING_EXIT_UNKILLED;
|
|
}
|
|
|
|
void tsync_start_sibling(struct tsync_sibling *sibling)
|
|
{
|
|
pthread_create(&sibling->tid, NULL, tsync_sibling, (void *)sibling);
|
|
}
|
|
|
|
TEST_F(TSYNC, siblings_fail_prctl)
|
|
{
|
|
long ret;
|
|
void *status;
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EINVAL),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
|
|
ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
|
|
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
|
|
}
|
|
|
|
/* Check prctl failure detection by requesting sib 0 diverge. */
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
|
|
ASSERT_NE(ENOSYS, errno) {
|
|
TH_LOG("Kernel does not support seccomp syscall!");
|
|
}
|
|
ASSERT_EQ(0, ret) {
|
|
TH_LOG("setting filter failed");
|
|
}
|
|
|
|
self->sibling[0].diverge = 1;
|
|
tsync_start_sibling(&self->sibling[0]);
|
|
tsync_start_sibling(&self->sibling[1]);
|
|
|
|
while (self->sibling_count < TSYNC_SIBLINGS) {
|
|
sem_wait(&self->started);
|
|
self->sibling_count++;
|
|
}
|
|
|
|
/* Signal the threads to clean up*/
|
|
pthread_mutex_lock(&self->mutex);
|
|
ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
|
|
TH_LOG("cond broadcast non-zero");
|
|
}
|
|
pthread_mutex_unlock(&self->mutex);
|
|
|
|
/* Ensure diverging sibling failed to call prctl. */
|
|
PTHREAD_JOIN(self->sibling[0].tid, &status);
|
|
EXPECT_EQ(SIBLING_EXIT_FAILURE, (long)status);
|
|
PTHREAD_JOIN(self->sibling[1].tid, &status);
|
|
EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
|
|
}
|
|
|
|
TEST_F(TSYNC, two_siblings_with_ancestor)
|
|
{
|
|
long ret;
|
|
void *status;
|
|
|
|
ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
|
|
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
|
|
}
|
|
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
|
|
ASSERT_NE(ENOSYS, errno) {
|
|
TH_LOG("Kernel does not support seccomp syscall!");
|
|
}
|
|
ASSERT_EQ(0, ret) {
|
|
TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
|
|
}
|
|
tsync_start_sibling(&self->sibling[0]);
|
|
tsync_start_sibling(&self->sibling[1]);
|
|
|
|
while (self->sibling_count < TSYNC_SIBLINGS) {
|
|
sem_wait(&self->started);
|
|
self->sibling_count++;
|
|
}
|
|
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
|
|
&self->apply_prog);
|
|
ASSERT_EQ(0, ret) {
|
|
TH_LOG("Could install filter on all threads!");
|
|
}
|
|
/* Tell the siblings to test the policy */
|
|
pthread_mutex_lock(&self->mutex);
|
|
ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
|
|
TH_LOG("cond broadcast non-zero");
|
|
}
|
|
pthread_mutex_unlock(&self->mutex);
|
|
/* Ensure they are both killed and don't exit cleanly. */
|
|
PTHREAD_JOIN(self->sibling[0].tid, &status);
|
|
EXPECT_EQ(0x0, (long)status);
|
|
PTHREAD_JOIN(self->sibling[1].tid, &status);
|
|
EXPECT_EQ(0x0, (long)status);
|
|
}
|
|
|
|
TEST_F(TSYNC, two_sibling_want_nnp)
|
|
{
|
|
void *status;
|
|
|
|
/* start siblings before any prctl() operations */
|
|
tsync_start_sibling(&self->sibling[0]);
|
|
tsync_start_sibling(&self->sibling[1]);
|
|
while (self->sibling_count < TSYNC_SIBLINGS) {
|
|
sem_wait(&self->started);
|
|
self->sibling_count++;
|
|
}
|
|
|
|
/* Tell the siblings to test no policy */
|
|
pthread_mutex_lock(&self->mutex);
|
|
ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
|
|
TH_LOG("cond broadcast non-zero");
|
|
}
|
|
pthread_mutex_unlock(&self->mutex);
|
|
|
|
/* Ensure they are both upset about lacking nnp. */
|
|
PTHREAD_JOIN(self->sibling[0].tid, &status);
|
|
EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status);
|
|
PTHREAD_JOIN(self->sibling[1].tid, &status);
|
|
EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status);
|
|
}
|
|
|
|
TEST_F(TSYNC, two_siblings_with_no_filter)
|
|
{
|
|
long ret;
|
|
void *status;
|
|
|
|
/* start siblings before any prctl() operations */
|
|
tsync_start_sibling(&self->sibling[0]);
|
|
tsync_start_sibling(&self->sibling[1]);
|
|
while (self->sibling_count < TSYNC_SIBLINGS) {
|
|
sem_wait(&self->started);
|
|
self->sibling_count++;
|
|
}
|
|
|
|
ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
|
|
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
|
|
}
|
|
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
|
|
&self->apply_prog);
|
|
ASSERT_NE(ENOSYS, errno) {
|
|
TH_LOG("Kernel does not support seccomp syscall!");
|
|
}
|
|
ASSERT_EQ(0, ret) {
|
|
TH_LOG("Could install filter on all threads!");
|
|
}
|
|
|
|
/* Tell the siblings to test the policy */
|
|
pthread_mutex_lock(&self->mutex);
|
|
ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
|
|
TH_LOG("cond broadcast non-zero");
|
|
}
|
|
pthread_mutex_unlock(&self->mutex);
|
|
|
|
/* Ensure they are both killed and don't exit cleanly. */
|
|
PTHREAD_JOIN(self->sibling[0].tid, &status);
|
|
EXPECT_EQ(0x0, (long)status);
|
|
PTHREAD_JOIN(self->sibling[1].tid, &status);
|
|
EXPECT_EQ(0x0, (long)status);
|
|
}
|
|
|
|
TEST_F(TSYNC, two_siblings_with_one_divergence)
|
|
{
|
|
long ret;
|
|
void *status;
|
|
|
|
ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
|
|
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
|
|
}
|
|
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
|
|
ASSERT_NE(ENOSYS, errno) {
|
|
TH_LOG("Kernel does not support seccomp syscall!");
|
|
}
|
|
ASSERT_EQ(0, ret) {
|
|
TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
|
|
}
|
|
self->sibling[0].diverge = 1;
|
|
tsync_start_sibling(&self->sibling[0]);
|
|
tsync_start_sibling(&self->sibling[1]);
|
|
|
|
while (self->sibling_count < TSYNC_SIBLINGS) {
|
|
sem_wait(&self->started);
|
|
self->sibling_count++;
|
|
}
|
|
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
|
|
&self->apply_prog);
|
|
ASSERT_EQ(self->sibling[0].system_tid, ret) {
|
|
TH_LOG("Did not fail on diverged sibling.");
|
|
}
|
|
|
|
/* Wake the threads */
|
|
pthread_mutex_lock(&self->mutex);
|
|
ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
|
|
TH_LOG("cond broadcast non-zero");
|
|
}
|
|
pthread_mutex_unlock(&self->mutex);
|
|
|
|
/* Ensure they are both unkilled. */
|
|
PTHREAD_JOIN(self->sibling[0].tid, &status);
|
|
EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
|
|
PTHREAD_JOIN(self->sibling[1].tid, &status);
|
|
EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
|
|
}
|
|
|
|
TEST_F(TSYNC, two_siblings_not_under_filter)
|
|
{
|
|
long ret, sib;
|
|
void *status;
|
|
|
|
ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
|
|
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
|
|
}
|
|
|
|
/*
|
|
* Sibling 0 will have its own seccomp policy
|
|
* and Sibling 1 will not be under seccomp at
|
|
* all. Sibling 1 will enter seccomp and 0
|
|
* will cause failure.
|
|
*/
|
|
self->sibling[0].diverge = 1;
|
|
tsync_start_sibling(&self->sibling[0]);
|
|
tsync_start_sibling(&self->sibling[1]);
|
|
|
|
while (self->sibling_count < TSYNC_SIBLINGS) {
|
|
sem_wait(&self->started);
|
|
self->sibling_count++;
|
|
}
|
|
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
|
|
ASSERT_NE(ENOSYS, errno) {
|
|
TH_LOG("Kernel does not support seccomp syscall!");
|
|
}
|
|
ASSERT_EQ(0, ret) {
|
|
TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
|
|
}
|
|
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
|
|
&self->apply_prog);
|
|
ASSERT_EQ(ret, self->sibling[0].system_tid) {
|
|
TH_LOG("Did not fail on diverged sibling.");
|
|
}
|
|
sib = 1;
|
|
if (ret == self->sibling[0].system_tid)
|
|
sib = 0;
|
|
|
|
pthread_mutex_lock(&self->mutex);
|
|
|
|
/* Increment the other siblings num_waits so we can clean up
|
|
* the one we just saw.
|
|
*/
|
|
self->sibling[!sib].num_waits += 1;
|
|
|
|
/* Signal the thread to clean up*/
|
|
ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
|
|
TH_LOG("cond broadcast non-zero");
|
|
}
|
|
pthread_mutex_unlock(&self->mutex);
|
|
PTHREAD_JOIN(self->sibling[sib].tid, &status);
|
|
EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
|
|
/* Poll for actual task death. pthread_join doesn't guarantee it. */
|
|
while (!kill(self->sibling[sib].system_tid, 0))
|
|
sleep(0.1);
|
|
/* Switch to the remaining sibling */
|
|
sib = !sib;
|
|
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
|
|
&self->apply_prog);
|
|
ASSERT_EQ(0, ret) {
|
|
TH_LOG("Expected the remaining sibling to sync");
|
|
};
|
|
|
|
pthread_mutex_lock(&self->mutex);
|
|
|
|
/* If remaining sibling didn't have a chance to wake up during
|
|
* the first broadcast, manually reduce the num_waits now.
|
|
*/
|
|
if (self->sibling[sib].num_waits > 1)
|
|
self->sibling[sib].num_waits = 1;
|
|
ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
|
|
TH_LOG("cond broadcast non-zero");
|
|
}
|
|
pthread_mutex_unlock(&self->mutex);
|
|
PTHREAD_JOIN(self->sibling[sib].tid, &status);
|
|
EXPECT_EQ(0, (long)status);
|
|
/* Poll for actual task death. pthread_join doesn't guarantee it. */
|
|
while (!kill(self->sibling[sib].system_tid, 0))
|
|
sleep(0.1);
|
|
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
|
|
&self->apply_prog);
|
|
ASSERT_EQ(0, ret); /* just us chickens */
|
|
}
|
|
|
|
/* Make sure restarted syscalls are seen directly as "restart_syscall". */
|
|
TEST(syscall_restart)
|
|
{
|
|
long ret;
|
|
unsigned long msg;
|
|
pid_t child_pid;
|
|
int pipefd[2];
|
|
int status;
|
|
siginfo_t info = { };
|
|
struct sock_filter filter[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
|
|
#ifdef __NR_sigreturn
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_sigreturn, 6, 0),
|
|
#endif
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 5, 0),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_exit, 4, 0),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_rt_sigreturn, 3, 0),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_nanosleep, 4, 0),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_restart_syscall, 4, 0),
|
|
|
|
/* Allow __NR_write for easy logging. */
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_write, 0, 1),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
|
|
/* The nanosleep jump target. */
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x100),
|
|
/* The restart_syscall jump target. */
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x200),
|
|
};
|
|
struct sock_fprog prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(filter),
|
|
.filter = filter,
|
|
};
|
|
#if defined(__arm__)
|
|
struct utsname utsbuf;
|
|
#endif
|
|
|
|
ASSERT_EQ(0, pipe(pipefd));
|
|
|
|
child_pid = fork();
|
|
ASSERT_LE(0, child_pid);
|
|
if (child_pid == 0) {
|
|
/* Child uses EXPECT not ASSERT to deliver status correctly. */
|
|
char buf = ' ';
|
|
struct timespec timeout = { };
|
|
|
|
/* Attach parent as tracer and stop. */
|
|
EXPECT_EQ(0, ptrace(PTRACE_TRACEME));
|
|
EXPECT_EQ(0, raise(SIGSTOP));
|
|
|
|
EXPECT_EQ(0, close(pipefd[1]));
|
|
|
|
EXPECT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
|
|
TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
|
|
}
|
|
|
|
ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
|
|
EXPECT_EQ(0, ret) {
|
|
TH_LOG("Failed to install filter!");
|
|
}
|
|
|
|
EXPECT_EQ(1, read(pipefd[0], &buf, 1)) {
|
|
TH_LOG("Failed to read() sync from parent");
|
|
}
|
|
EXPECT_EQ('.', buf) {
|
|
TH_LOG("Failed to get sync data from read()");
|
|
}
|
|
|
|
/* Start nanosleep to be interrupted. */
|
|
timeout.tv_sec = 1;
|
|
errno = 0;
|
|
EXPECT_EQ(0, nanosleep(&timeout, NULL)) {
|
|
TH_LOG("Call to nanosleep() failed (errno %d)", errno);
|
|
}
|
|
|
|
/* Read final sync from parent. */
|
|
EXPECT_EQ(1, read(pipefd[0], &buf, 1)) {
|
|
TH_LOG("Failed final read() from parent");
|
|
}
|
|
EXPECT_EQ('!', buf) {
|
|
TH_LOG("Failed to get final data from read()");
|
|
}
|
|
|
|
/* Directly report the status of our test harness results. */
|
|
syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS
|
|
: EXIT_FAILURE);
|
|
}
|
|
EXPECT_EQ(0, close(pipefd[0]));
|
|
|
|
/* Attach to child, setup options, and release. */
|
|
ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
|
|
ASSERT_EQ(true, WIFSTOPPED(status));
|
|
ASSERT_EQ(0, ptrace(PTRACE_SETOPTIONS, child_pid, NULL,
|
|
PTRACE_O_TRACESECCOMP));
|
|
ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
|
|
ASSERT_EQ(1, write(pipefd[1], ".", 1));
|
|
|
|
/* Wait for nanosleep() to start. */
|
|
ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
|
|
ASSERT_EQ(true, WIFSTOPPED(status));
|
|
ASSERT_EQ(SIGTRAP, WSTOPSIG(status));
|
|
ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16));
|
|
ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg));
|
|
ASSERT_EQ(0x100, msg);
|
|
EXPECT_EQ(__NR_nanosleep, get_syscall(_metadata, child_pid));
|
|
|
|
/* Might as well check siginfo for sanity while we're here. */
|
|
ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info));
|
|
ASSERT_EQ(SIGTRAP, info.si_signo);
|
|
ASSERT_EQ(SIGTRAP | (PTRACE_EVENT_SECCOMP << 8), info.si_code);
|
|
EXPECT_EQ(0, info.si_errno);
|
|
EXPECT_EQ(getuid(), info.si_uid);
|
|
/* Verify signal delivery came from child (seccomp-triggered). */
|
|
EXPECT_EQ(child_pid, info.si_pid);
|
|
|
|
/* Interrupt nanosleep with SIGSTOP (which we'll need to handle). */
|
|
ASSERT_EQ(0, kill(child_pid, SIGSTOP));
|
|
ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
|
|
ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
|
|
ASSERT_EQ(true, WIFSTOPPED(status));
|
|
ASSERT_EQ(SIGSTOP, WSTOPSIG(status));
|
|
/* Verify signal delivery came from parent now. */
|
|
ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info));
|
|
EXPECT_EQ(getpid(), info.si_pid);
|
|
|
|
/* Restart nanosleep with SIGCONT, which triggers restart_syscall. */
|
|
ASSERT_EQ(0, kill(child_pid, SIGCONT));
|
|
ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
|
|
ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
|
|
ASSERT_EQ(true, WIFSTOPPED(status));
|
|
ASSERT_EQ(SIGCONT, WSTOPSIG(status));
|
|
ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
|
|
|
|
/* Wait for restart_syscall() to start. */
|
|
ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
|
|
ASSERT_EQ(true, WIFSTOPPED(status));
|
|
ASSERT_EQ(SIGTRAP, WSTOPSIG(status));
|
|
ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16));
|
|
ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg));
|
|
|
|
ASSERT_EQ(0x200, msg);
|
|
ret = get_syscall(_metadata, child_pid);
|
|
#if defined(__arm__)
|
|
/*
|
|
* FIXME:
|
|
* - native ARM registers do NOT expose true syscall.
|
|
* - compat ARM registers on ARM64 DO expose true syscall.
|
|
*/
|
|
ASSERT_EQ(0, uname(&utsbuf));
|
|
if (strncmp(utsbuf.machine, "arm", 3) == 0) {
|
|
EXPECT_EQ(__NR_nanosleep, ret);
|
|
} else
|
|
#endif
|
|
{
|
|
EXPECT_EQ(__NR_restart_syscall, ret);
|
|
}
|
|
|
|
/* Write again to end test. */
|
|
ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
|
|
ASSERT_EQ(1, write(pipefd[1], "!", 1));
|
|
EXPECT_EQ(0, close(pipefd[1]));
|
|
|
|
ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
|
|
if (WIFSIGNALED(status) || WEXITSTATUS(status))
|
|
_metadata->passed = 0;
|
|
}
|
|
|
|
TEST_SIGNAL(filter_flag_log, SIGSYS)
|
|
{
|
|
struct sock_filter allow_filter[] = {
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_filter kill_filter[] = {
|
|
BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
|
|
offsetof(struct seccomp_data, nr)),
|
|
BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
|
|
BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
|
|
};
|
|
struct sock_fprog allow_prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(allow_filter),
|
|
.filter = allow_filter,
|
|
};
|
|
struct sock_fprog kill_prog = {
|
|
.len = (unsigned short)ARRAY_SIZE(kill_filter),
|
|
.filter = kill_filter,
|
|
};
|
|
long ret;
|
|
pid_t parent = getppid();
|
|
|
|
ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
|
|
ASSERT_EQ(0, ret);
|
|
|
|
/* Verify that the FILTER_FLAG_LOG flag isn't accepted in strict mode */
|
|
ret = seccomp(SECCOMP_SET_MODE_STRICT, SECCOMP_FILTER_FLAG_LOG,
|
|
&allow_prog);
|
|
ASSERT_NE(ENOSYS, errno) {
|
|
TH_LOG("Kernel does not support seccomp syscall!");
|
|
}
|
|
EXPECT_NE(0, ret) {
|
|
TH_LOG("Kernel accepted FILTER_FLAG_LOG flag in strict mode!");
|
|
}
|
|
EXPECT_EQ(EINVAL, errno) {
|
|
TH_LOG("Kernel returned unexpected errno for FILTER_FLAG_LOG flag in strict mode!");
|
|
}
|
|
|
|
/* Verify that a simple, permissive filter can be added with no flags */
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &allow_prog);
|
|
EXPECT_EQ(0, ret);
|
|
|
|
/* See if the same filter can be added with the FILTER_FLAG_LOG flag */
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG,
|
|
&allow_prog);
|
|
ASSERT_NE(EINVAL, errno) {
|
|
TH_LOG("Kernel does not support the FILTER_FLAG_LOG flag!");
|
|
}
|
|
EXPECT_EQ(0, ret);
|
|
|
|
/* Ensure that the kill filter works with the FILTER_FLAG_LOG flag */
|
|
ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG,
|
|
&kill_prog);
|
|
EXPECT_EQ(0, ret);
|
|
|
|
EXPECT_EQ(parent, syscall(__NR_getppid));
|
|
/* getpid() should never return. */
|
|
EXPECT_EQ(0, syscall(__NR_getpid));
|
|
}
|
|
|
|
TEST(get_action_avail)
|
|
{
|
|
__u32 actions[] = { SECCOMP_RET_KILL_THREAD, SECCOMP_RET_TRAP,
|
|
SECCOMP_RET_ERRNO, SECCOMP_RET_TRACE,
|
|
SECCOMP_RET_LOG, SECCOMP_RET_ALLOW };
|
|
__u32 unknown_action = 0x10000000U;
|
|
int i;
|
|
long ret;
|
|
|
|
ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &actions[0]);
|
|
ASSERT_NE(ENOSYS, errno) {
|
|
TH_LOG("Kernel does not support seccomp syscall!");
|
|
}
|
|
ASSERT_NE(EINVAL, errno) {
|
|
TH_LOG("Kernel does not support SECCOMP_GET_ACTION_AVAIL operation!");
|
|
}
|
|
EXPECT_EQ(ret, 0);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(actions); i++) {
|
|
ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &actions[i]);
|
|
EXPECT_EQ(ret, 0) {
|
|
TH_LOG("Expected action (0x%X) not available!",
|
|
actions[i]);
|
|
}
|
|
}
|
|
|
|
/* Check that an unknown action is handled properly (EOPNOTSUPP) */
|
|
ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &unknown_action);
|
|
EXPECT_EQ(ret, -1);
|
|
EXPECT_EQ(errno, EOPNOTSUPP);
|
|
}
|
|
|
|
/*
|
|
* TODO:
|
|
* - add microbenchmarks
|
|
* - expand NNP testing
|
|
* - better arch-specific TRACE and TRAP handlers.
|
|
* - endianness checking when appropriate
|
|
* - 64-bit arg prodding
|
|
* - arch value testing (x86 modes especially)
|
|
* - verify that FILTER_FLAG_LOG filters generate log messages
|
|
* - verify that RET_LOG generates log messages
|
|
* - ...
|
|
*/
|
|
|
|
TEST_HARNESS_MAIN
|