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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: 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>
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@ -350,7 +350,8 @@ bool is_ucounts_overlimit(struct ucounts *ucounts, enum ucount_type type, unsign
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if (rlimit > LONG_MAX)
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max = LONG_MAX;
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for (iter = ucounts; iter; iter = iter->ns->ucounts) {
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if (get_ucounts_value(iter, type) > max)
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long val = get_ucounts_value(iter, type);
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if (val < 0 || val > max)
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return true;
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max = READ_ONCE(iter->ns->ucount_max[type]);
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}
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