mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 19:53:59 +08:00
964ee7df90
sys_delete_module() can set MODULE_STATE_GOING after search_binary_handler() does try_module_get(). In this case set_binfmt()->try_module_get() fails but since none of the callers check the returned error, the task will run with the wrong old ->binfmt. The proper fix should change all ->load_binary() methods, but we can rely on fact that the caller must hold a reference to binfmt->module and use __module_get() which never fails. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com> Cc: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
128 lines
4.1 KiB
C
128 lines
4.1 KiB
C
#ifndef _LINUX_BINFMTS_H
|
|
#define _LINUX_BINFMTS_H
|
|
|
|
#include <linux/capability.h>
|
|
|
|
struct pt_regs;
|
|
|
|
/*
|
|
* These are the maximum length and maximum number of strings passed to the
|
|
* execve() system call. MAX_ARG_STRLEN is essentially random but serves to
|
|
* prevent the kernel from being unduly impacted by misaddressed pointers.
|
|
* MAX_ARG_STRINGS is chosen to fit in a signed 32-bit integer.
|
|
*/
|
|
#define MAX_ARG_STRLEN (PAGE_SIZE * 32)
|
|
#define MAX_ARG_STRINGS 0x7FFFFFFF
|
|
|
|
/* sizeof(linux_binprm->buf) */
|
|
#define BINPRM_BUF_SIZE 128
|
|
|
|
#ifdef __KERNEL__
|
|
#include <linux/list.h>
|
|
|
|
#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;
|
|
#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;
|
|
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;
|
|
char * filename; /* Name of binary as seen by procps */
|
|
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;
|
|
};
|
|
|
|
#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)
|
|
|
|
#define BINPRM_MAX_RECURSION 4
|
|
|
|
/*
|
|
* 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 *, struct pt_regs * regs);
|
|
int (*load_shlib)(struct file *);
|
|
int (*core_dump)(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);
|
|
unsigned long min_coredump; /* minimal dump size */
|
|
int hasvdso;
|
|
};
|
|
|
|
extern int __register_binfmt(struct linux_binfmt *fmt, int insert);
|
|
|
|
/* Registration of default binfmt handlers */
|
|
static inline int register_binfmt(struct linux_binfmt *fmt)
|
|
{
|
|
return __register_binfmt(fmt, 0);
|
|
}
|
|
/* Same as above, but adds a new binfmt at the top of the list */
|
|
static inline int insert_binfmt(struct linux_binfmt *fmt)
|
|
{
|
|
return __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 *,struct pt_regs *);
|
|
extern int flush_old_exec(struct linux_binprm * bprm);
|
|
|
|
extern int suid_dumpable;
|
|
#define SUID_DUMP_DISABLE 0 /* No setuid dumping */
|
|
#define SUID_DUMP_USER 1 /* Dump as user of process */
|
|
#define SUID_DUMP_ROOT 2 /* Dump as root */
|
|
|
|
/* 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 bprm_mm_init(struct linux_binprm *bprm);
|
|
extern int copy_strings_kernel(int argc,char ** 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 do_coredump(long signr, int exit_code, struct pt_regs *regs);
|
|
extern void set_binfmt(struct linux_binfmt *new);
|
|
extern void free_bprm(struct linux_binprm *);
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _LINUX_BINFMTS_H */
|