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Hexagon: check to if we will overflow the signal stack

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Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
This commit is contained in:
Richard Kuo 2012-05-29 18:56:39 -05:00
parent a11e67c261
commit 9cdae82d14
1 changed files with 4 additions and 0 deletions
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4
arch/hexagon/kernel/signal.c
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@ -41,6 +41,10 @@ static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
{ {
unsigned long sp = regs->r29; unsigned long sp = regs->r29;
/* check if we would overflow the alt stack */
if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size)))
return (void __user __force *)-1UL;
/* Switch to signal stack if appropriate */ /* Switch to signal stack if appropriate */
if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags(sp) == 0)) if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags(sp) == 0))
sp = current->sas_ss_sp + current->sas_ss_size; sp = current->sas_ss_sp + current->sas_ss_size;