From: Richard Kuo <rkuo@codeaurora.org>
To: linux-arch@vger.kernel.org, linux-hexagon@vger.kernel.org,
linux-kernel@vger.kernel.org, viro@ZenIV.linux.org.uk
Cc: Richard Kuo <rkuo@codeaurora.org>
Subject: [PATCH 4/6] Hexagon: check to if we will overflow the signal stack
Date: Wed, 3 Apr 2013 19:02:54 -0500 [thread overview]
Message-ID: <1365033776-21804-5-git-send-email-rkuo@codeaurora.org> (raw)
In-Reply-To: <1365033776-21804-1-git-send-email-rkuo@codeaurora.org>
Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
---
arch/hexagon/kernel/signal.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/hexagon/kernel/signal.c b/arch/hexagon/kernel/signal.c
index 8a20e8e..097623c 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;
--
1.7.9.5
--
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation
next prev parent reply other threads:[~2013-04-04 0:02 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-04 0:02 [PATCH 0/6] Hexagon: various signal and return path cleanups Richard Kuo
2013-04-04 0:02 ` [PATCH 1/6] Hexagon: Signal and return path fixes Richard Kuo
2013-04-04 0:02 ` [PATCH 2/6] Hexagon: fix up int enable/disable at ret_from_fork Richard Kuo
2013-04-04 0:02 ` [PATCH 3/6] Hexagon: use correct work mask when checking for more work Richard Kuo
2013-04-04 0:02 ` Richard Kuo [this message]
2013-04-04 16:25 ` [PATCH 4/6] Hexagon: check to if we will overflow the signal stack Linas Vepstas
2013-04-04 16:58 ` Richard Kuo
2013-04-04 0:02 ` [PATCH 5/6] Hexagon: break up user fn/arg register setting Richard Kuo
2013-04-04 0:02 ` [PATCH 6/6] Hexagon: fix psp/sp macro Richard Kuo
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