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From:   ebiederm@xmission.com (Eric W. Biederman)
To:     Alexey Gladkov <legion@kernel.org>
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Date:   Mon, 18 Oct 2021 12:23:07 -0500
In-Reply-To: <871r4itfjw.fsf_-_@disp2133> (Eric W. Biederman's message of
        "Mon, 18 Oct 2021 12:21:07 -0500")
Message-ID: <87v91us0w4.fsf_-_@disp2133>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)
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Subject: [PATCH 1/3] ucounts: Pair inc_rlimit_ucounts with dec_rlimit_ucoutns in commit_creds
Precedence: bulk


The purpose of inc_rlimit_ucounts and dec_rlimit_ucounts in commit_creds
is to change which rlimit counter is used to track a process when the
credentials changes.

Use the same test for both to guarantee the tracking is correct.

Cc: stable@vger.kernel.org
Fixes: 21d1c5e386bc ("Reimplement RLIMIT_NPROC on top of ucounts")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
 kernel/cred.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/cred.c b/kernel/cred.c
index f784e08c2fbd..3d163bfd64a9 100644
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -501,7 +501,7 @@ int commit_creds(struct cred *new)
 		inc_rlimit_ucounts(new->ucounts, UCOUNT_RLIMIT_NPROC, 1);
 	rcu_assign_pointer(task->real_cred, new);
 	rcu_assign_pointer(task->cred, new);
-	if (new->user != old->user)
+	if (new->user != old->user || new->user_ns != old->user_ns)
 		dec_rlimit_ucounts(old->ucounts, UCOUNT_RLIMIT_NPROC, 1);
 	alter_cred_subscribers(old, -2);
 
-- 
2.20.1