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exec: avoid RLIMIT_STACK races with prlimit() 

While the defense-in-depth RLIMIT_STACK limit on setuid processes was
protected against races from other threads calling setrlimit(), I missed
protecting it against races from external processes calling prlimit().
This adds locking around the change and makes sure that rlim_max is set
too.

Link: http://lkml.kernel.org/r/20171127193457.GA11348@beast
Fixes: 64701dee41 ("exec: Use sane stack rlimit under secureexec")
Signed-off-by: Kees Cook <keescook@chromium.org>
Reported-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Reported-by: Brad Spengler <spender@grsecurity.net>
Acked-by: Serge Hallyn <serge@hallyn.com>
Cc: James Morris <james.l.morris@oracle.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kees Cook 2017-11-29 16:10:51 -08:00 committed by Linus Torvalds
parent 5f1d43de54
commit 04e35f4495
1 changed files with 6 additions and 1 deletions
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7
fs/exec.c
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@ -1340,10 +1340,15 @@ void setup_new_exec(struct linux_binprm * bprm)
* avoid bad behavior from the prior rlimits. This has to
* happen before arch_pick_mmap_layout(), which examines
* RLIMIT_STACK, but after the point of no return to avoid
* needing to clean up the change on failure.
* races from other threads changing the limits. This also
* must be protected from races with prlimit() calls.
*/
task_lock(current->group_leader);
if (current->signal->rlim[RLIMIT_STACK].rlim_cur > _STK_LIM)
current->signal->rlim[RLIMIT_STACK].rlim_cur = _STK_LIM;
if (current->signal->rlim[RLIMIT_STACK].rlim_max > _STK_LIM)
current->signal->rlim[RLIMIT_STACK].rlim_max = _STK_LIM;
task_unlock(current->group_leader);
}
arch_pick_mmap_layout(current->mm);