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authorJohn Stultz <john.stultz@linaro.org>2015-02-09 23:30:36 -0800
committerIngo Molnar <mingo@kernel.org>2015-02-18 14:50:10 +0100
commit29183a70b0b828500816bd794b3fe192fce89f73 (patch)
treeb0f40ccd43fb98fc1f9c03d65501442803a948fb /kernel
parente07e0d4cb0c4bfe822ec8491cc06269096a38bea (diff)
downloadlinux-29183a70b0b828500816bd794b3fe192fce89f73.tar.bz2
ntp: Fixup adjtimex freq validation on 32-bit systems
Additional validation of adjtimex freq values to avoid potential multiplication overflows were added in commit 5e5aeb4367b (time: adjtimex: Validate the ADJ_FREQUENCY values) Unfortunately the patch used LONG_MAX/MIN instead of LLONG_MAX/MIN, which was fine on 64-bit systems, but being much smaller on 32-bit systems caused false positives resulting in most direct frequency adjustments to fail w/ EINVAL. ntpd only does direct frequency adjustments at startup, so the issue was not as easily observed there, but other time sync applications like ptpd and chrony were more effected by the bug. See bugs: https://bugzilla.kernel.org/show_bug.cgi?id=92481 https://bugzilla.redhat.com/show_bug.cgi?id=1188074 This patch changes the checks to use LLONG_MAX for clarity, and additionally the checks are disabled on 32-bit systems since LLONG_MAX/PPM_SCALE is always larger then the 32-bit long freq value, so multiplication overflows aren't possible there. Reported-by: Josh Boyer <jwboyer@fedoraproject.org> Reported-by: George Joseph <george.joseph@fairview5.com> Tested-by: George Joseph <george.joseph@fairview5.com> Signed-off-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: <stable@vger.kernel.org> # v3.19+ Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Sasha Levin <sasha.levin@oracle.com> Link: http://lkml.kernel.org/r/1423553436-29747-1-git-send-email-john.stultz@linaro.org [ Prettified the changelog and the comments a bit. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/time/ntp.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 4b585e0fdd22..0f60b08a4f07 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -633,10 +633,14 @@ int ntp_validate_timex(struct timex *txc)
if ((txc->modes & ADJ_SETOFFSET) && (!capable(CAP_SYS_TIME)))
return -EPERM;
- if (txc->modes & ADJ_FREQUENCY) {
- if (LONG_MIN / PPM_SCALE > txc->freq)
+ /*
+ * Check for potential multiplication overflows that can
+ * only happen on 64-bit systems:
+ */
+ if ((txc->modes & ADJ_FREQUENCY) && (BITS_PER_LONG == 64)) {
+ if (LLONG_MIN / PPM_SCALE > txc->freq)
return -EINVAL;
- if (LONG_MAX / PPM_SCALE < txc->freq)
+ if (LLONG_MAX / PPM_SCALE < txc->freq)
return -EINVAL;
}