diff options
| author | Kees Cook <[email protected]> | 2017-11-29 16:10:51 -0800 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2017-11-29 18:40:42 -0800 |
| commit | 04e35f4495dd560db30c25efca4eecae8ec8c375 (patch) | |
| tree | 62d890cff810621d1143f601df6181384fb87a86 | |
| parent | 5f1d43de54164dcfb9bfa542fcc92c1e1a1b6c1d (diff) | |
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: 64701dee4178e ("exec: Use sane stack rlimit under secureexec")
Signed-off-by: Kees Cook <[email protected]>
Reported-by: Ben Hutchings <[email protected]>
Reported-by: Brad Spengler <[email protected]>
Acked-by: Serge Hallyn <[email protected]>
Cc: James Morris <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | fs/exec.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/exec.c b/fs/exec.c index 1d6243d9f2b6..6be2aa0ab26f 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -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); |