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author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2007-10-01 01:20:13 -0700 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-01 07:52:23 -0700 |
commit | 9f96cb1e8bca179a92afa40dfc3c49990f1cfc71 (patch) | |
tree | 7d1f921f488aa570083420dc3846856b17a7b2b6 /kernel/utsname_sysctl.c | |
parent | 8792f961ba8057d9f27987def3600253a3ba060f (diff) | |
download | linux-stable-9f96cb1e8bca179a92afa40dfc3c49990f1cfc71.tar.gz linux-stable-9f96cb1e8bca179a92afa40dfc3c49990f1cfc71.tar.bz2 linux-stable-9f96cb1e8bca179a92afa40dfc3c49990f1cfc71.zip |
robust futex thread exit race
Calling handle_futex_death in exit_robust_list for the different robust
mutexes of a thread basically frees the mutex. Another thread might grab
the lock immediately which updates the next pointer of the mutex.
fetch_robust_entry over the next pointer might therefore branch into the
robust mutex list of a different thread. This can cause two problems: 1)
some mutexes held by the dead thread are not getting freed and 2) some
mutexs held by a different thread are freed.
The next point need to be read before calling handle_futex_death.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/utsname_sysctl.c')
0 files changed, 0 insertions, 0 deletions