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| author | Eric W. Biederman <ebiederm@xmission.com> | 2020-03-30 16:33:39 -0500 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2020-05-11 12:08:48 -0500 |
| commit | a28bf136e651e17d7e2c753aa140ce3cc1df36a0 (patch) | |
| tree | 59d5b9fac27883ec10a233dad05a0dd64857d053 /fs/exec.c | |
| parent | 13c432b51449dcdcfa0350fb87250b1dbd1fbd12 (diff) | |
| download | linux-a28bf136e651e17d7e2c753aa140ce3cc1df36a0.tar.gz | |
exec: Run sync_mm_rss before taking exec_update_mutex
Like exec_mm_release sync_mm_rss is about flushing out the state of
the old_mm, which does not need to happen under exec_update_mutex.
Make this explicit by moving sync_mm_rss outside of exec_update_mutex.
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lkml.kernel.org/r/875zd66za3.fsf_-_@x220.int.ebiederm.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'fs/exec.c')
| -rw-r--r-- | fs/exec.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/exec.c b/fs/exec.c index 82106241ed531..ecee0ebebf85f 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1051,13 +1051,14 @@ static int exec_mmap(struct mm_struct *mm) tsk = current; old_mm = current->mm; exec_mm_release(tsk, old_mm); + if (old_mm) + sync_mm_rss(old_mm); ret = mutex_lock_killable(&tsk->signal->exec_update_mutex); if (ret) return ret; if (old_mm) { - sync_mm_rss(old_mm); /* * Make sure that if there is a core dump in progress * for the old mm, we get out and die instead of going |