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| author | Richard Kuo <rkuo@codeaurora.org> | 2012-05-29 18:56:39 -0500 |
|---|---|---|
| committer | Richard Kuo <rkuo@codeaurora.org> | 2013-04-30 19:40:24 -0500 |
| commit | 9cdae82d14f8f9e272304dccb48434482e57d43c (patch) | |
| tree | 1640d27f7ef97236a4fe1a1ad44d3fd4383e82f6 /arch/hexagon/kernel/signal.c | |
| parent | a11e67c2611d483622aad007a3533e7dfbea700e (diff) | |
Hexagon: check to if we will overflow the signal stack
Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Diffstat (limited to 'arch/hexagon/kernel/signal.c')
| -rw-r--r-- | arch/hexagon/kernel/signal.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/hexagon/kernel/signal.c b/arch/hexagon/kernel/signal.c index 8a20e8ed5d7d..097623c0c4b4 100644 --- a/arch/hexagon/kernel/signal.c +++ b/arch/hexagon/kernel/signal.c @@ -41,6 +41,10 @@ static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, { 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 */ if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags(sp) == 0)) sp = current->sas_ss_sp + current->sas_ss_size; |