3859a271a0
This marks many critical kernel structures for randomization. These are structures that have been targeted in the past in security exploits, or contain functions pointers, pointers to function pointer tables, lists, workqueues, ref-counters, credentials, permissions, or are otherwise sensitive. This initial list was extracted from Brad Spengler/PaX Team's code in the last public patch of grsecurity/PaX based on my understanding of the code. Changes or omissions from the original code are mine and don't reflect the original grsecurity/PaX code. Left out of this list is task_struct, which requires special handling and will be covered in a subsequent patch. Signed-off-by: Kees Cook <keescook@chromium.org>
137 lines
4.4 KiB
C
137 lines
4.4 KiB
C
#ifndef _LINUX_BINFMTS_H
|
|
#define _LINUX_BINFMTS_H
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/unistd.h>
|
|
#include <asm/exec.h>
|
|
#include <uapi/linux/binfmts.h>
|
|
|
|
struct filename;
|
|
|
|
#define CORENAME_MAX_SIZE 128
|
|
|
|
/*
|
|
* This structure is used to hold the arguments that are used when loading binaries.
|
|
*/
|
|
struct linux_binprm {
|
|
char buf[BINPRM_BUF_SIZE];
|
|
#ifdef CONFIG_MMU
|
|
struct vm_area_struct *vma;
|
|
unsigned long vma_pages;
|
|
#else
|
|
# define MAX_ARG_PAGES 32
|
|
struct page *page[MAX_ARG_PAGES];
|
|
#endif
|
|
struct mm_struct *mm;
|
|
unsigned long p; /* current top of mem */
|
|
unsigned int
|
|
cred_prepared:1,/* true if creds already prepared (multiple
|
|
* preps happen for interpreters) */
|
|
cap_effective:1;/* true if has elevated effective capabilities,
|
|
* false if not; except for init which inherits
|
|
* its parent's caps anyway */
|
|
#ifdef __alpha__
|
|
unsigned int taso:1;
|
|
#endif
|
|
unsigned int recursion_depth; /* only for search_binary_handler() */
|
|
struct file * file;
|
|
struct cred *cred; /* new credentials */
|
|
int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */
|
|
unsigned int per_clear; /* bits to clear in current->personality */
|
|
int argc, envc;
|
|
const char * filename; /* Name of binary as seen by procps */
|
|
const char * interp; /* Name of the binary really executed. Most
|
|
of the time same as filename, but could be
|
|
different for binfmt_{misc,script} */
|
|
unsigned interp_flags;
|
|
unsigned interp_data;
|
|
unsigned long loader, exec;
|
|
} __randomize_layout;
|
|
|
|
#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
|
|
#define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
|
|
|
|
/* fd of the binary should be passed to the interpreter */
|
|
#define BINPRM_FLAGS_EXECFD_BIT 1
|
|
#define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
|
|
|
|
/* filename of the binary will be inaccessible after exec */
|
|
#define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2
|
|
#define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT)
|
|
|
|
/* Function parameter for binfmt->coredump */
|
|
struct coredump_params {
|
|
const siginfo_t *siginfo;
|
|
struct pt_regs *regs;
|
|
struct file *file;
|
|
unsigned long limit;
|
|
unsigned long mm_flags;
|
|
loff_t written;
|
|
loff_t pos;
|
|
};
|
|
|
|
/*
|
|
* This structure defines the functions that are used to load the binary formats that
|
|
* linux accepts.
|
|
*/
|
|
struct linux_binfmt {
|
|
struct list_head lh;
|
|
struct module *module;
|
|
int (*load_binary)(struct linux_binprm *);
|
|
int (*load_shlib)(struct file *);
|
|
int (*core_dump)(struct coredump_params *cprm);
|
|
unsigned long min_coredump; /* minimal dump size */
|
|
} __randomize_layout;
|
|
|
|
extern void __register_binfmt(struct linux_binfmt *fmt, int insert);
|
|
|
|
/* Registration of default binfmt handlers */
|
|
static inline void register_binfmt(struct linux_binfmt *fmt)
|
|
{
|
|
__register_binfmt(fmt, 0);
|
|
}
|
|
/* Same as above, but adds a new binfmt at the top of the list */
|
|
static inline void insert_binfmt(struct linux_binfmt *fmt)
|
|
{
|
|
__register_binfmt(fmt, 1);
|
|
}
|
|
|
|
extern void unregister_binfmt(struct linux_binfmt *);
|
|
|
|
extern int prepare_binprm(struct linux_binprm *);
|
|
extern int __must_check remove_arg_zero(struct linux_binprm *);
|
|
extern int search_binary_handler(struct linux_binprm *);
|
|
extern int flush_old_exec(struct linux_binprm * bprm);
|
|
extern void setup_new_exec(struct linux_binprm * bprm);
|
|
extern void would_dump(struct linux_binprm *, struct file *);
|
|
|
|
extern int suid_dumpable;
|
|
|
|
/* Stack area protections */
|
|
#define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */
|
|
#define EXSTACK_DISABLE_X 1 /* Disable executable stacks */
|
|
#define EXSTACK_ENABLE_X 2 /* Enable executable stacks */
|
|
|
|
extern int setup_arg_pages(struct linux_binprm * bprm,
|
|
unsigned long stack_top,
|
|
int executable_stack);
|
|
extern int transfer_args_to_stack(struct linux_binprm *bprm,
|
|
unsigned long *sp_location);
|
|
extern int bprm_change_interp(char *interp, struct linux_binprm *bprm);
|
|
extern int copy_strings_kernel(int argc, const char *const *argv,
|
|
struct linux_binprm *bprm);
|
|
extern int prepare_bprm_creds(struct linux_binprm *bprm);
|
|
extern void install_exec_creds(struct linux_binprm *bprm);
|
|
extern void set_binfmt(struct linux_binfmt *new);
|
|
extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t);
|
|
|
|
extern int do_execve(struct filename *,
|
|
const char __user * const __user *,
|
|
const char __user * const __user *);
|
|
extern int do_execveat(int, struct filename *,
|
|
const char __user * const __user *,
|
|
const char __user * const __user *,
|
|
int);
|
|
|
|
#endif /* _LINUX_BINFMTS_H */
|