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authorShi Weihua <shiwh@cn.fujitsu.com>2008-02-19 10:26:19 +0800
committerTony Luck <tony.luck@intel.com>2008-03-04 14:11:22 -0800
commit86dffa4cd1a1d61fed68ab64c674d4094f2bdfe4 (patch)
treebb6450017d8327f0403037e850dbf755d9584159 /arch/ia64
parentd7a6c68a2f991b18e61ebfe0251ab42c054d9a1d (diff)
[IA64] signal(ia64_ia32): add a signal stack overflow check
The similar check has been added to x86_32(i386) in commit id 83bd01024b1fdfc41d9b758e5669e80fca72df66. So we add this check to ia64_ia32 and improve it a liitle bit in that we need to check for stack overflow only when the signal is on stack. Signed-off-by: Shi Weihua <shiwh@cn.fujitsu.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/ia32/ia32_signal.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/arch/ia64/ia32/ia32_signal.c b/arch/ia64/ia32/ia32_signal.c
index 85e82f32e48..256a7faeda0 100644
--- a/arch/ia64/ia32/ia32_signal.c
+++ b/arch/ia64/ia32/ia32_signal.c
@@ -766,8 +766,19 @@ get_sigframe (struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
/* This is the X/Open sanctioned signal stack switching. */
if (ka->sa.sa_flags & SA_ONSTACK) {
- if (!on_sig_stack(esp))
+ int onstack = sas_ss_flags(esp);
+
+ if (onstack == 0)
esp = current->sas_ss_sp + current->sas_ss_size;
+ else if (onstack == SS_ONSTACK) {
+ /*
+ * If we are on the alternate signal stack and would
+ * overflow it, don't. Return an always-bogus address
+ * instead so we will die with SIGSEGV.
+ */
+ if (!likely(on_sig_stack(esp - frame_size)))
+ return (void __user *) -1L;
+ }
}
/* Legacy stack switching not supported */