diff options
| author | Eric W. Biederman | 2022-02-09 18:09:41 -0600 |
|---|---|---|
| committer | Eric W. Biederman | 2022-02-17 09:11:57 -0600 |
| commit | 0cbae9e24fa7d6c6e9f828562f084da82217a0c5 (patch) | |
| tree | d00fdbcb46cfce60dfe064db7b6a8dc2568da262 /kernel | |
| parent | c923a8e7edb010da67424077cbf1a6f1396ebd2e (diff) | |
ucounts: Handle wrapping in is_ucounts_overlimit
While examining is_ucounts_overlimit and reading the various messages
I realized that is_ucounts_overlimit fails to deal with counts that
may have wrapped.
Being wrapped should be a transitory state for counts and they should
never be wrapped for long, but it can happen so handle it.
Cc: stable@vger.kernel.org
Fixes: 21d1c5e386bc ("Reimplement RLIMIT_NPROC on top of ucounts")
Link: https://lkml.kernel.org/r/20220216155832.680775-5-ebiederm@xmission.com
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/ucount.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/ucount.c b/kernel/ucount.c index 65b597431c86..06ea04d44685 100644 --- a/kernel/ucount.c +++ b/kernel/ucount.c @@ -350,7 +350,8 @@ bool is_ucounts_overlimit(struct ucounts *ucounts, enum ucount_type type, unsign if (rlimit > LONG_MAX) max = LONG_MAX; for (iter = ucounts; iter; iter = iter->ns->ucounts) { - if (get_ucounts_value(iter, type) > max) + long val = get_ucounts_value(iter, type); + if (val < 0 || val > max) return true; max = READ_ONCE(iter->ns->ucount_max[type]); } |