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time: adjtimex: Validate the ADJ_FREQUENCY values

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commit 5e5aeb4367b450a28f447f6d5ab57d8f2ab16a5f upstream.

Verify that the frequency value from userspace is valid and makes sense.

Unverified values can cause overflows later on.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
[jstultz: Fix up bug for negative values and drop redunent cap check]
Signed-off-by: John Stultz <john.stultz@linaro.org>
[lizf: Backported to 3.4: adjust context]
Signed-off-by: Zefan Li <lizefan@huawei.com>
This commit is contained in:
Sasha Levin 2014-12-03 19:25:05 -05:00 committed by Zefan Li
parent 370375c0a4
commit 3f6d9b6262
1 changed files with 7 additions and 0 deletions
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7
kernel/time/ntp.c
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@ -660,6 +660,13 @@ int do_adjtimex(struct timex *txc)
return result;
}
if (txc->modes & ADJ_FREQUENCY) {
if (LONG_MIN / PPM_SCALE > txc->freq)
return -EINVAL;
if (LONG_MAX / PPM_SCALE < txc->freq)
return -EINVAL;
}
getnstimeofday(&ts);
spin_lock_irq(&ntp_lock);