linux-kernel - [PATCH 3.16 027/366] signal/xtensa: Consistenly use SIGBUS in do_unaligned

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Date:   Sun, 11 Nov 2018 19:49:05 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, linux-xtensa@...ux-xtensa.org,
        "Max Filippov" <jcmvbkbc@...il.com>,
        "Chris Zankel" <chris@...kel.net>,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 3.16 027/366] signal/xtensa: Consistenly use SIGBUS in
 do_unaligned_user

3.16.61-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: "Eric W. Biederman" <ebiederm@...ssion.com>

commit 7de712ccc096b81d23cc0a941cd9b8cb3956605d upstream.

While working on changing this code to use force_sig_fault I
discovered that do_unaliged_user is sets si_signo to SIGBUS and passes
SIGSEGV to force_sig_info.  Which is just b0rked.

The code is reporting a SIGBUS error so replace the SIGSEGV with SIGBUS.

Cc: Chris Zankel <chris@...kel.net>
Cc: Max Filippov <jcmvbkbc@...il.com>
Cc: linux-xtensa@...ux-xtensa.org
Acked-by: Max Filippov <jcmvbkbc@...il.com>
Fixes: 5a0015d62668 ("[PATCH] xtensa: Architecture support for Tensilica Xtensa Part 3")
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/xtensa/kernel/traps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -282,7 +282,7 @@ do_unaligned_user (struct pt_regs *regs)
 	info.si_errno = 0;
 	info.si_code = BUS_ADRALN;
 	info.si_addr = (void *) regs->excvaddr;
-	force_sig_info(SIGSEGV, &info, current);
+	force_sig_info(SIGBUS, &info, current);
 
 }
 #endif