[IA64] signal(ia64_ia32): add a signal stack overflow check (86dffa4c) · Commits · 戴 / test

The similar check has been added to x86_32(i386) in commit id . 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>

arch/ia64/ia32/ia32_signal.c

+12 −1

Original line number	Diff line number	Diff line
		@@ -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 */

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