diff options
| author | Kees Cook <keescook@chromium.org> | 2017-12-12 11:28:38 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-12-17 14:26:25 -0800 |
| commit | 779f4e1c6c7c661db40dfebd6dd6bda7b5f88aa3 (patch) | |
| tree | 82a08df0d53ff8eaed94c405f79690a5c11f4fae | |
| parent | f8940a0f20ebf3f1fb81008a6a9b287b65a85a92 (diff) | |
Revert "exec: avoid RLIMIT_STACK races with prlimit()"
This reverts commit 04e35f4495dd560db30c25efca4eecae8ec8c375.
SELinux runs with secureexec for all non-"noatsecure" domain transitions,
which means lots of processes end up hitting the stack hard-limit change
that was introduced in order to fix a race with prlimit(). That race fix
will need to be redesigned.
Reported-by: Laura Abbott <labbott@redhat.com>
Reported-by: Tomáš Trnka <trnka@scm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/exec.c | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/fs/exec.c b/fs/exec.c index 156f56acfe8e..5688b5e1b937 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1339,15 +1339,10 @@ 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 - * races from other threads changing the limits. This also - * must be protected from races with prlimit() calls. + * needing to clean up the change on failure. */ - 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); |