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authorPaul Mackerras <paulus@samba.org>2005-04-30 10:01:40 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-30 10:01:40 -0700
commit9747dd6fa98f2983f4dd09cd6dad1fa3d2a4c5f2 (patch)
treef8e191827f6ff913d083a89028b1b732ef56b231
parenta6ad57fb4b5e9d68553f4440377b99f75588fa88 (diff)
[PATCH] ppc64: fix 32-bit signal frame back link
When the kernel creates a signal frame on the user stack, it puts the old stack pointer value at the beginning so that the signal frame is linked into the chain of stack frames like any other frame. Unfortunately, for 32-bit processes we are writing the old stack pointer as a 64-bit value rather than a 32-bit value, and the process sees that as a null pointer, since it only looks at the first 32 bits, which are zero since ppc is bigendian and the stack pointer is below 4GB. This bug is in SLES9 and RHEL4 too, hence the ccs. This patch fixes the bug by making the signal code write the old stack pointer as a u32 instead of an unsigned long. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/ppc64/kernel/signal32.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/ppc64/kernel/signal32.c b/arch/ppc64/kernel/signal32.c
index b0e167db6af..3c2fa5c284c 100644
--- a/arch/ppc64/kernel/signal32.c
+++ b/arch/ppc64/kernel/signal32.c
@@ -657,7 +657,7 @@ static int handle_rt_signal32(unsigned long sig, struct k_sigaction *ka,
/* Save user registers on the stack */
frame = &rt_sf->uc.uc_mcontext;
- if (put_user(regs->gpr[1], (unsigned long __user *)newsp))
+ if (put_user(regs->gpr[1], (u32 __user *)newsp))
goto badframe;
if (vdso32_rt_sigtramp && current->thread.vdso_base) {
@@ -842,7 +842,7 @@ static int handle_signal32(unsigned long sig, struct k_sigaction *ka,
regs->link = (unsigned long) frame->mctx.tramp;
}
- if (put_user(regs->gpr[1], (unsigned long __user *)newsp))
+ if (put_user(regs->gpr[1], (u32 __user *)newsp))
goto badframe;
regs->gpr[1] = (unsigned long) newsp;
regs->gpr[3] = sig;