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ucounts: Handle wrapping in is_ucounts_overlimit

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commit 0cbae9e24f upstream.

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: 21d1c5e386 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric W. Biederman 2022-02-09 18:09:41 -06:00 • committed by Justin Hammond
parent 9dd7fd8019
commit 6f924d0160
1 changed files with 2 additions and 1 deletions
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3
kernel/ucount.c
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@ -344,7 +344,8 @@ 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]);
}