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authorJosh Boyer <jwboyer@linux.vnet.ibm.com>2009-03-25 06:23:59 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-03-27 16:58:24 +1100
commitefbda86098455da014be849713df6498cefc5a2a (patch)
treefb239d51dd521bb2976807eeedfacd17be9b6824 /arch/powerpc/kernel/signal_64.c
parent82631f5dd114e52239fb3d1e270a49d37c088b46 (diff)
powerpc: Sanitize stack pointer in signal handling code
On powerpc64 machines running 32-bit userspace, we can get garbage bits in the stack pointer passed into the kernel. Most places handle this correctly, but the signal handling code uses the passed value directly for allocating signal stack frames. This fixes the issue by introducing a get_clean_sp function that returns a sanitized stack pointer. For 32-bit tasks on a 64-bit kernel, the stack pointer is masked correctly. In all other cases, the stack pointer is simply returned. Additionally, we pass an 'is_32' parameter to get_sigframe now in order to get the properly sanitized stack. The callers are know to be 32 or 64-bit statically. Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/signal_64.c')
-rw-r--r--arch/powerpc/kernel/signal_64.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index e132891d3ce..2fe6fc64b61 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -402,7 +402,7 @@ int handle_rt_signal64(int signr, struct k_sigaction *ka, siginfo_t *info,
unsigned long newsp = 0;
long err = 0;
- frame = get_sigframe(ka, regs, sizeof(*frame));
+ frame = get_sigframe(ka, regs, sizeof(*frame), 0);
if (unlikely(frame == NULL))
goto badframe;