From: Cedric Le Goater <[email protected]>
[patch 4/5] s390: rt_sigreturn fix.
Check return code of do_sigaltstack and force a SIGSEGV
if it is -EFAULT.
Signed-off-by: Martin Schwidefsky <[email protected]>
Signed-off-by: Cedric Le Goater <[email protected]>
---
arch/s390/kernel/compat_signal.c | 2 --
arch/s390/kernel/signal.c | 6 +++---
2 files changed, 3 insertions(+), 5 deletions(-)
diff -urpN linux-2.6/arch/s390/kernel/compat_signal.c linux-2.6-patched/arch/s390/kernel/compat_signal.c
--- linux-2.6/arch/s390/kernel/compat_signal.c 2005-10-28 02:02:08.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/compat_signal.c 2005-11-21 18:40:07.000000000 +0100
@@ -467,8 +467,6 @@ asmlinkage long sys32_rt_sigreturn(struc
if (err)
goto badframe;
- /* It is more difficult to avoid calling this function than to
- call it and ignore errors. */
set_fs (KERNEL_DS);
do_sigaltstack((stack_t __user *)&st, NULL, regs->gprs[15]);
set_fs (old_fs);
diff -urpN linux-2.6/arch/s390/kernel/signal.c linux-2.6-patched/arch/s390/kernel/signal.c
--- linux-2.6/arch/s390/kernel/signal.c 2005-10-28 02:02:08.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/signal.c 2005-11-21 18:40:07.000000000 +0100
@@ -254,9 +254,9 @@ asmlinkage long sys_rt_sigreturn(struct
if (restore_sigregs(regs, &frame->uc.uc_mcontext))
goto badframe;
- /* It is more difficult to avoid calling this function than to
- call it and ignore errors. */
- do_sigaltstack(&frame->uc.uc_stack, NULL, regs->gprs[15]);
+ if (do_sigaltstack(&frame->uc.uc_stack, NULL,
+ regs->gprs[15]) == -EFAULT)
+ goto badframe;
return regs->gprs[2];
badframe:
-
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