![Laurent Meyer](/assets/img/avatar_default.png)
If a signal handler has been established with the SA_ONSTACK option but no alternate stack is provided with sigaltstack(), the kernel still tries to install the alternate stack. Also when setting an alternate stack with sigalstack() and the SS_DISABLE flag, the kernel tries to install the alternate stack on signal delivery. Use the correct conditions sas_ss_flags() to check if the alternate stack has to be used. Signed-off-by: Laurent Meyer <meyerlau@fr.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
587 lines
17 KiB
C
587 lines
17 KiB
C
/*
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* arch/s390/kernel/compat_signal.c
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*
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* Copyright (C) IBM Corp. 2000,2006
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* Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
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* Gerhard Tonn (ton@de.ibm.com)
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
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*/
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#include <linux/config.h>
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#include <linux/compat.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/errno.h>
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#include <linux/wait.h>
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#include <linux/ptrace.h>
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#include <linux/unistd.h>
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#include <linux/stddef.h>
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#include <linux/tty.h>
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#include <linux/personality.h>
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#include <linux/binfmts.h>
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#include <asm/ucontext.h>
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#include <asm/uaccess.h>
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#include <asm/lowcore.h>
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#include "compat_linux.h"
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#include "compat_ptrace.h"
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#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
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typedef struct
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{
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__u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
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struct sigcontext32 sc;
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_sigregs32 sregs;
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int signo;
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__u8 retcode[S390_SYSCALL_SIZE];
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} sigframe32;
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typedef struct
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{
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__u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
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__u8 retcode[S390_SYSCALL_SIZE];
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compat_siginfo_t info;
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struct ucontext32 uc;
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} rt_sigframe32;
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int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
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{
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int err;
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if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
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return -EFAULT;
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/* If you change siginfo_t structure, please be sure
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this code is fixed accordingly.
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It should never copy any pad contained in the structure
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to avoid security leaks, but must copy the generic
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3 ints plus the relevant union member.
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This routine must convert siginfo from 64bit to 32bit as well
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at the same time. */
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err = __put_user(from->si_signo, &to->si_signo);
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err |= __put_user(from->si_errno, &to->si_errno);
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err |= __put_user((short)from->si_code, &to->si_code);
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if (from->si_code < 0)
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err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
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else {
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switch (from->si_code >> 16) {
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case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
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case __SI_MESGQ >> 16:
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err |= __put_user(from->si_int, &to->si_int);
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/* fallthrough */
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case __SI_KILL >> 16:
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err |= __put_user(from->si_pid, &to->si_pid);
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err |= __put_user(from->si_uid, &to->si_uid);
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break;
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case __SI_CHLD >> 16:
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err |= __put_user(from->si_pid, &to->si_pid);
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err |= __put_user(from->si_uid, &to->si_uid);
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err |= __put_user(from->si_utime, &to->si_utime);
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err |= __put_user(from->si_stime, &to->si_stime);
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err |= __put_user(from->si_status, &to->si_status);
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break;
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case __SI_FAULT >> 16:
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err |= __put_user((unsigned long) from->si_addr,
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&to->si_addr);
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break;
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case __SI_POLL >> 16:
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err |= __put_user(from->si_band, &to->si_band);
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err |= __put_user(from->si_fd, &to->si_fd);
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break;
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case __SI_TIMER >> 16:
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err |= __put_user(from->si_tid, &to->si_tid);
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err |= __put_user(from->si_overrun, &to->si_overrun);
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err |= __put_user(from->si_int, &to->si_int);
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break;
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default:
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break;
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}
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}
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return err;
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}
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int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
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{
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int err;
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u32 tmp;
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if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t)))
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return -EFAULT;
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err = __get_user(to->si_signo, &from->si_signo);
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err |= __get_user(to->si_errno, &from->si_errno);
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err |= __get_user(to->si_code, &from->si_code);
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if (to->si_code < 0)
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err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
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else {
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switch (to->si_code >> 16) {
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case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
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case __SI_MESGQ >> 16:
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err |= __get_user(to->si_int, &from->si_int);
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/* fallthrough */
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case __SI_KILL >> 16:
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err |= __get_user(to->si_pid, &from->si_pid);
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err |= __get_user(to->si_uid, &from->si_uid);
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break;
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case __SI_CHLD >> 16:
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err |= __get_user(to->si_pid, &from->si_pid);
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err |= __get_user(to->si_uid, &from->si_uid);
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err |= __get_user(to->si_utime, &from->si_utime);
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err |= __get_user(to->si_stime, &from->si_stime);
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err |= __get_user(to->si_status, &from->si_status);
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break;
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case __SI_FAULT >> 16:
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err |= __get_user(tmp, &from->si_addr);
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to->si_addr = (void __user *)(u64) (tmp & PSW32_ADDR_INSN);
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break;
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case __SI_POLL >> 16:
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err |= __get_user(to->si_band, &from->si_band);
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err |= __get_user(to->si_fd, &from->si_fd);
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break;
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case __SI_TIMER >> 16:
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err |= __get_user(to->si_tid, &from->si_tid);
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err |= __get_user(to->si_overrun, &from->si_overrun);
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err |= __get_user(to->si_int, &from->si_int);
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break;
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default:
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break;
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}
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}
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return err;
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}
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asmlinkage long
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sys32_sigaction(int sig, const struct old_sigaction32 __user *act,
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struct old_sigaction32 __user *oact)
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{
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struct k_sigaction new_ka, old_ka;
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unsigned long sa_handler, sa_restorer;
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int ret;
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if (act) {
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compat_old_sigset_t mask;
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if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
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__get_user(sa_handler, &act->sa_handler) ||
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__get_user(sa_restorer, &act->sa_restorer))
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return -EFAULT;
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new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
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new_ka.sa.sa_restorer = (void (*)(void)) sa_restorer;
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__get_user(new_ka.sa.sa_flags, &act->sa_flags);
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__get_user(mask, &act->sa_mask);
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siginitset(&new_ka.sa.sa_mask, mask);
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}
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ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
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if (!ret && oact) {
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sa_handler = (unsigned long) old_ka.sa.sa_handler;
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sa_restorer = (unsigned long) old_ka.sa.sa_restorer;
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if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
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__put_user(sa_handler, &oact->sa_handler) ||
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__put_user(sa_restorer, &oact->sa_restorer))
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return -EFAULT;
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__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
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__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
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}
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return ret;
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}
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asmlinkage long
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sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
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struct sigaction32 __user *oact, size_t sigsetsize)
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{
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struct k_sigaction new_ka, old_ka;
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unsigned long sa_handler;
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int ret;
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compat_sigset_t set32;
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/* XXX: Don't preclude handling different sized sigset_t's. */
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if (sigsetsize != sizeof(compat_sigset_t))
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return -EINVAL;
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if (act) {
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ret = get_user(sa_handler, &act->sa_handler);
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ret |= __copy_from_user(&set32, &act->sa_mask,
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sizeof(compat_sigset_t));
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switch (_NSIG_WORDS) {
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case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6]
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| (((long)set32.sig[7]) << 32);
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case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4]
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| (((long)set32.sig[5]) << 32);
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case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2]
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| (((long)set32.sig[3]) << 32);
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case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0]
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| (((long)set32.sig[1]) << 32);
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}
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ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
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if (ret)
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return -EFAULT;
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new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
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}
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ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
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if (!ret && oact) {
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switch (_NSIG_WORDS) {
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case 4:
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set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32);
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set32.sig[6] = old_ka.sa.sa_mask.sig[3];
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case 3:
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set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32);
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set32.sig[4] = old_ka.sa.sa_mask.sig[2];
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case 2:
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set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32);
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set32.sig[2] = old_ka.sa.sa_mask.sig[1];
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case 1:
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set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
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set32.sig[0] = old_ka.sa.sa_mask.sig[0];
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}
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ret = put_user((unsigned long)old_ka.sa.sa_handler, &oact->sa_handler);
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ret |= __copy_to_user(&oact->sa_mask, &set32,
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sizeof(compat_sigset_t));
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ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
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}
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return ret;
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}
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asmlinkage long
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sys32_sigaltstack(const stack_t32 __user *uss, stack_t32 __user *uoss,
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struct pt_regs *regs)
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{
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stack_t kss, koss;
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unsigned long ss_sp;
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int ret, err = 0;
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mm_segment_t old_fs = get_fs();
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if (uss) {
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if (!access_ok(VERIFY_READ, uss, sizeof(*uss)))
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return -EFAULT;
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err |= __get_user(ss_sp, &uss->ss_sp);
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err |= __get_user(kss.ss_size, &uss->ss_size);
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err |= __get_user(kss.ss_flags, &uss->ss_flags);
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if (err)
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return -EFAULT;
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kss.ss_sp = (void __user *) ss_sp;
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}
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set_fs (KERNEL_DS);
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ret = do_sigaltstack((stack_t __user *) (uss ? &kss : NULL),
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(stack_t __user *) (uoss ? &koss : NULL),
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regs->gprs[15]);
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set_fs (old_fs);
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if (!ret && uoss) {
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if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)))
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return -EFAULT;
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ss_sp = (unsigned long) koss.ss_sp;
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err |= __put_user(ss_sp, &uoss->ss_sp);
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err |= __put_user(koss.ss_size, &uoss->ss_size);
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err |= __put_user(koss.ss_flags, &uoss->ss_flags);
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if (err)
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return -EFAULT;
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}
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return ret;
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}
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static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
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{
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_s390_regs_common32 regs32;
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int err, i;
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regs32.psw.mask = PSW32_MASK_MERGE(PSW32_USER_BITS,
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(__u32)(regs->psw.mask >> 32));
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regs32.psw.addr = PSW32_ADDR_AMODE31 | (__u32) regs->psw.addr;
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for (i = 0; i < NUM_GPRS; i++)
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regs32.gprs[i] = (__u32) regs->gprs[i];
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save_access_regs(current->thread.acrs);
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memcpy(regs32.acrs, current->thread.acrs, sizeof(regs32.acrs));
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err = __copy_to_user(&sregs->regs, ®s32, sizeof(regs32));
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if (err)
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return err;
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save_fp_regs(¤t->thread.fp_regs);
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/* s390_fp_regs and _s390_fp_regs32 are the same ! */
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return __copy_to_user(&sregs->fpregs, ¤t->thread.fp_regs,
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sizeof(_s390_fp_regs32));
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}
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static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
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{
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_s390_regs_common32 regs32;
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int err, i;
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/* Alwys make any pending restarted system call return -EINTR */
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current_thread_info()->restart_block.fn = do_no_restart_syscall;
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err = __copy_from_user(®s32, &sregs->regs, sizeof(regs32));
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if (err)
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return err;
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regs->psw.mask = PSW_MASK_MERGE(regs->psw.mask,
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(__u64)regs32.psw.mask << 32);
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regs->psw.addr = (__u64)(regs32.psw.addr & PSW32_ADDR_INSN);
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for (i = 0; i < NUM_GPRS; i++)
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regs->gprs[i] = (__u64) regs32.gprs[i];
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memcpy(current->thread.acrs, regs32.acrs, sizeof(current->thread.acrs));
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restore_access_regs(current->thread.acrs);
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err = __copy_from_user(¤t->thread.fp_regs, &sregs->fpregs,
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sizeof(_s390_fp_regs32));
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current->thread.fp_regs.fpc &= FPC_VALID_MASK;
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if (err)
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return err;
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restore_fp_regs(¤t->thread.fp_regs);
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regs->trap = -1; /* disable syscall checks */
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return 0;
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}
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asmlinkage long sys32_sigreturn(struct pt_regs *regs)
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{
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sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15];
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sigset_t set;
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if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
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goto badframe;
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if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32))
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goto badframe;
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sigdelsetmask(&set, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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current->blocked = set;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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if (restore_sigregs32(regs, &frame->sregs))
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goto badframe;
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return regs->gprs[2];
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badframe:
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force_sig(SIGSEGV, current);
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return 0;
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}
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asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs)
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{
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rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15];
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sigset_t set;
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stack_t st;
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__u32 ss_sp;
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int err;
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mm_segment_t old_fs = get_fs();
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if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
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goto badframe;
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if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
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goto badframe;
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sigdelsetmask(&set, ~_BLOCKABLE);
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spin_lock_irq(¤t->sighand->siglock);
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current->blocked = set;
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recalc_sigpending();
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spin_unlock_irq(¤t->sighand->siglock);
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if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
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goto badframe;
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err = __get_user(ss_sp, &frame->uc.uc_stack.ss_sp);
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st.ss_sp = compat_ptr(ss_sp);
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err |= __get_user(st.ss_size, &frame->uc.uc_stack.ss_size);
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err |= __get_user(st.ss_flags, &frame->uc.uc_stack.ss_flags);
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if (err)
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goto badframe;
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set_fs (KERNEL_DS);
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do_sigaltstack((stack_t __user *)&st, NULL, regs->gprs[15]);
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set_fs (old_fs);
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return regs->gprs[2];
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badframe:
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force_sig(SIGSEGV, current);
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return 0;
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}
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/*
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* Set up a signal frame.
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*/
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/*
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* Determine which stack to use..
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*/
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static inline void __user *
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get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
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{
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unsigned long sp;
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/* Default to using normal stack */
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sp = (unsigned long) A(regs->gprs[15]);
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/* This is the X/Open sanctioned signal stack switching. */
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if (ka->sa.sa_flags & SA_ONSTACK) {
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if (! sas_ss_flags(sp))
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sp = current->sas_ss_sp + current->sas_ss_size;
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}
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/* This is the legacy signal stack switching. */
|
|
else if (!user_mode(regs) &&
|
|
!(ka->sa.sa_flags & SA_RESTORER) &&
|
|
ka->sa.sa_restorer) {
|
|
sp = (unsigned long) ka->sa.sa_restorer;
|
|
}
|
|
|
|
return (void __user *)((sp - frame_size) & -8ul);
|
|
}
|
|
|
|
static inline int map_signal(int sig)
|
|
{
|
|
if (current_thread_info()->exec_domain
|
|
&& current_thread_info()->exec_domain->signal_invmap
|
|
&& sig < 32)
|
|
return current_thread_info()->exec_domain->signal_invmap[sig];
|
|
else
|
|
return sig;
|
|
}
|
|
|
|
static int setup_frame32(int sig, struct k_sigaction *ka,
|
|
sigset_t *set, struct pt_regs * regs)
|
|
{
|
|
sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(sigframe32));
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe32)))
|
|
goto give_sigsegv;
|
|
|
|
if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE32))
|
|
goto give_sigsegv;
|
|
|
|
if (save_sigregs32(regs, &frame->sregs))
|
|
goto give_sigsegv;
|
|
if (__put_user((unsigned long) &frame->sregs, &frame->sc.sregs))
|
|
goto give_sigsegv;
|
|
|
|
/* Set up to return from userspace. If provided, use a stub
|
|
already in userspace. */
|
|
if (ka->sa.sa_flags & SA_RESTORER) {
|
|
regs->gprs[14] = (__u64) ka->sa.sa_restorer;
|
|
} else {
|
|
regs->gprs[14] = (__u64) frame->retcode;
|
|
if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn,
|
|
(u16 __user *)(frame->retcode)))
|
|
goto give_sigsegv;
|
|
}
|
|
|
|
/* Set up backchain. */
|
|
if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
|
|
goto give_sigsegv;
|
|
|
|
/* Set up registers for signal handler */
|
|
regs->gprs[15] = (__u64) frame;
|
|
regs->psw.addr = (__u64) ka->sa.sa_handler;
|
|
|
|
regs->gprs[2] = map_signal(sig);
|
|
regs->gprs[3] = (__u64) &frame->sc;
|
|
|
|
/* We forgot to include these in the sigcontext.
|
|
To avoid breaking binary compatibility, they are passed as args. */
|
|
regs->gprs[4] = current->thread.trap_no;
|
|
regs->gprs[5] = current->thread.prot_addr;
|
|
|
|
/* Place signal number on stack to allow backtrace from handler. */
|
|
if (__put_user(regs->gprs[2], (int __user *) &frame->signo))
|
|
goto give_sigsegv;
|
|
return 0;
|
|
|
|
give_sigsegv:
|
|
force_sigsegv(sig, current);
|
|
return -EFAULT;
|
|
}
|
|
|
|
static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info,
|
|
sigset_t *set, struct pt_regs * regs)
|
|
{
|
|
int err = 0;
|
|
rt_sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(rt_sigframe32));
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe32)))
|
|
goto give_sigsegv;
|
|
|
|
if (copy_siginfo_to_user32(&frame->info, info))
|
|
goto give_sigsegv;
|
|
|
|
/* Create the ucontext. */
|
|
err |= __put_user(0, &frame->uc.uc_flags);
|
|
err |= __put_user(0, &frame->uc.uc_link);
|
|
err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
|
|
err |= __put_user(sas_ss_flags(regs->gprs[15]),
|
|
&frame->uc.uc_stack.ss_flags);
|
|
err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
|
|
err |= save_sigregs32(regs, &frame->uc.uc_mcontext);
|
|
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
|
if (err)
|
|
goto give_sigsegv;
|
|
|
|
/* Set up to return from userspace. If provided, use a stub
|
|
already in userspace. */
|
|
if (ka->sa.sa_flags & SA_RESTORER) {
|
|
regs->gprs[14] = (__u64) ka->sa.sa_restorer;
|
|
} else {
|
|
regs->gprs[14] = (__u64) frame->retcode;
|
|
err |= __put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn,
|
|
(u16 __user *)(frame->retcode));
|
|
}
|
|
|
|
/* Set up backchain. */
|
|
if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
|
|
goto give_sigsegv;
|
|
|
|
/* Set up registers for signal handler */
|
|
regs->gprs[15] = (__u64) frame;
|
|
regs->psw.addr = (__u64) ka->sa.sa_handler;
|
|
|
|
regs->gprs[2] = map_signal(sig);
|
|
regs->gprs[3] = (__u64) &frame->info;
|
|
regs->gprs[4] = (__u64) &frame->uc;
|
|
return 0;
|
|
|
|
give_sigsegv:
|
|
force_sigsegv(sig, current);
|
|
return -EFAULT;
|
|
}
|
|
|
|
/*
|
|
* OK, we're invoking a handler
|
|
*/
|
|
|
|
int
|
|
handle_signal32(unsigned long sig, struct k_sigaction *ka,
|
|
siginfo_t *info, sigset_t *oldset, struct pt_regs * regs)
|
|
{
|
|
int ret;
|
|
|
|
/* Set up the stack frame */
|
|
if (ka->sa.sa_flags & SA_SIGINFO)
|
|
ret = setup_rt_frame32(sig, ka, info, oldset, regs);
|
|
else
|
|
ret = setup_frame32(sig, ka, oldset, regs);
|
|
|
|
if (ret == 0) {
|
|
spin_lock_irq(¤t->sighand->siglock);
|
|
sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
|
|
if (!(ka->sa.sa_flags & SA_NODEFER))
|
|
sigaddset(¤t->blocked,sig);
|
|
recalc_sigpending();
|
|
spin_unlock_irq(¤t->sighand->siglock);
|
|
}
|
|
return ret;
|
|
}
|
|
|