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exec: Rename the flag called_exec_mmap point_of_no_return

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Update the comments and make the code easier to understand by
renaming this flag.

Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Greg Ungerer <gerg@linux-m68k.org>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2020-04-02 18:17:50 -05:00
parent 89826cce37
commit 1507b7a30a
2 changed files with 9 additions and 9 deletions
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12
fs/exec.c
View file

@ -1326,12 +1326,12 @@ int flush_old_exec(struct linux_binprm * bprm)
goto out;
/*
* After setting bprm->called_exec_mmap (to mark that current is
* using the prepared mm now), we have nothing left of the original
* process. If anything from here on returns an error, the check
* in search_binary_handler() will SEGV current.
* With the new mm installed it is completely impossible to
* fail and return to the original process. If anything from
* here on returns an error, the check in
* search_binary_handler() will SEGV current.
*/
bprm->called_exec_mmap = 1;
bprm->point_of_no_return = true;
bprm->mm = NULL;
#ifdef CONFIG_POSIX_TIMERS
@ -1720,7 +1720,7 @@ int search_binary_handler(struct linux_binprm *bprm)
read_lock(&binfmt_lock);
put_binfmt(fmt);
if (retval < 0 && bprm->called_exec_mmap) {
if (retval < 0 && bprm->point_of_no_return) {
/* we got to flush_old_exec() and failed after it */
read_unlock(&binfmt_lock);
force_sigsegv(SIGSEGV);

6
include/linux/binfmts.h
View file

@ -46,10 +46,10 @@ struct linux_binprm {
*/
secureexec:1,
/*
* Set by flush_old_exec, when exec_mmap has been called.
* This is past the point of no return.
* Set when errors can no longer be returned to the
* original userspace.
*/
called_exec_mmap:1;
point_of_no_return:1;
#ifdef __alpha__
unsigned int taso:1;
#endif