redonkable/remarkable-linux
redonkable/remarkable-linux
1
0
Fork 0
Code Releases Activity
remarkable-linux/arch/ia64
History
Luck, Tony c76f39bddb ia64: fix futex_atomic_cmpxchg_inatomic() 
Michel Lespinasse cleaned up the futex calling conventions in commit
37a9d912b2 ("futex: Sanitize cmpxchg_futex_value_locked API").

But the ia64 implementation was subtly broken.  Gcc does not know that
register "r8" will be updated by the fault handler if the cmpxchg
instruction takes an exception.  So it feels safe in letting the
initialization of r8 slide to after the cmpxchg.  Result: we always
return 0 whether the user address faulted or not.

Fix by moving the initialization of r8 into the __asm__ code so gcc
won't move it.

Reported-by: <emeric.maschino@gmail.com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=42757
Tested-by: <emeric.maschino@gmail.com>
Acked-by: Michel Lespinasse <walken@google.com>
Cc: stable@vger.kernel.org # v2.6.39+
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-04-16 18:30:01 -07:00
..
configs Merge branch 'misc-3.2' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux 2011-11-02 16:52:17 -07:00
dig Disintegrate asm/system.h for IA64 2012-03-28 18:30:02 +01:00
hp Merge branch 'for-linus' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping 2012-04-04 17:13:43 -07:00
include/asm ia64: fix futex_atomic_cmpxchg_inatomic() 2012-04-16 18:30:01 -07:00
kernel Merge branch 'for-linus' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping 2012-04-04 17:13:43 -07:00
kvm KVM: Ensure all vcpus are consistent with in-kernel irqchip settings 2012-03-08 14:10:30 +02:00
lib
mm Disintegrate asm/system.h for IA64 2012-03-28 18:30:02 +01:00
oprofile Disintegrate asm/system.h for IA64 2012-03-28 18:30:02 +01:00
pci Disintegrate and delete asm/system.h 2012-03-28 15:58:21 -07:00
scripts
sn Merge branch 'for-linus' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping 2012-04-04 17:13:43 -07:00
uv
xen Disintegrate asm/system.h for IA64 2012-03-28 18:30:02 +01:00
install.sh
Kconfig lib: use generic pci_iomap on all architectures 2012-01-10 18:04:27 -08:00
Kconfig.debug
Makefile
module.lds