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[IA64] signal(ia64_ia32): add a signal stack overflow check 

The similar check has been added to x86_32(i386) in commit
id 83bd01024b.
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>
This commit is contained in:
Shi Weihua 2008-02-19 10:26:19 +08:00 committed by Tony Luck
parent d7a6c68a2f
commit 86dffa4cd1
1 changed files with 12 additions and 1 deletions
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13
arch/ia64/ia32/ia32_signal.c
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@ -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 */