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Message-Id: <20180528100100.918706366@linuxfoundation.org>
Date: Mon, 28 May 2018 12:02:30 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Rich Felker <dalias@...c.org>,
Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 3.18 109/185] sh: fix debug trap failure to process signals before return to user
3.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Rich Felker <dalias@...c.org>
[ Upstream commit 96a598996f6ac518ac79839ecbb17c91af91f4f7 ]
When responding to a debug trap (breakpoint) in userspace, the
kernel's trap handler raised SIGTRAP but returned from the trap via a
code path that ignored pending signals, resulting in an infinite loop
re-executing the trapping instruction.
Signed-off-by: Rich Felker <dalias@...c.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
arch/sh/kernel/entry-common.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/sh/kernel/entry-common.S
+++ b/arch/sh/kernel/entry-common.S
@@ -255,7 +255,7 @@ debug_trap:
mov.l @r8, r8
jsr @r8
nop
- bra __restore_all
+ bra ret_from_exception
nop
CFI_ENDPROC
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