diff options
author | Thomas Gleixner <tglx@linutronix.de> | 2008-12-20 21:27:34 +0100 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-12-20 14:13:45 -0800 |
commit | 3d44cc3e01ee1b40317f79ed54324e25c4f848df (patch) | |
tree | 99feb824dd6beda01bf11c56e412ff147bf24551 /arch/x86/kernel/apic.c | |
parent | ab65387243f47a7bc11725f733c86bf27248b326 (diff) |
Null pointer deref with hrtimer_try_to_cancel()
Impact: Prevent kernel crash with posix timer clockid CLOCK_MONOTONIC_RAW
commit 2d42244ae71d6c7b0884b5664cf2eda30fb2ae68 (clocksource:
introduce CLOCK_MONOTONIC_RAW) introduced a new clockid, which is only
available to read out the raw not NTP adjusted system time.
The above commit did not prevent that a posix timer can be created
with that clockid. The timer_create() syscall succeeds and initializes
the timer to a non existing hrtimer base. When the timer is deleted
either by timer_delete() or by the exit() cleanup the kernel crashes.
Prevent the creation of timers for CLOCK_MONOTONIC_RAW by setting the
posix clock function to no_timer_create which returns an error code.
Reported-and-tested-by: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/kernel/apic.c')
0 files changed, 0 insertions, 0 deletions