linux-kernel - [PATCH 1/2] mn10300/misalignment: Use SIGSEGV SEGV

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Message-Id: <20180112203135.4669-1-ebiederm@xmission.com>
Date:   Fri, 12 Jan 2018 14:31:34 -0600
From:   "Eric W. Biederman" <ebiederm@...ssion.com>
To:     linux-kernel@...r.kernel.org
Cc:     Al Viro <viro@...iv.linux.org.uk>, Oleg Nesterov <oleg@...hat.com>,
        linux-arch@...r.kernel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        stable@...r.kernel.org, David Howells <dhowells@...hat.com>,
        Masakazu Urade <urade.masakazu@...panasonic.com>,
        Koichi Yasutake <yasutake.koichi@...panasonic.com>
Subject: [PATCH 1/2] mn10300/misalignment: Use SIGSEGV SEGV_MAPERR to report a failed user copy

Setting si_code to 0 is the same a setting si_code to SI_USER which is definitely
not correct.  With si_code set to SI_USER si_pid and si_uid will be copied to
userspace instead of si_addr.  Which is very wrong.

So fix this by using a sensible si_code (SEGV_MAPERR) for this failure.

Cc: stable@...r.kernel.org
Fixes: b920de1b77b7 ("mn10300: add the MN10300/AM33 architecture to the kernel")
Cc: David Howells <dhowells@...hat.com>
Cc: Masakazu Urade <urade.masakazu@...panasonic.com>
Cc: Koichi Yasutake <yasutake.koichi@...panasonic.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 arch/mn10300/mm/misalignment.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mn10300/mm/misalignment.c b/arch/mn10300/mm/misalignment.c
index b39a388825ae..8ace89617c1c 100644
--- a/arch/mn10300/mm/misalignment.c
+++ b/arch/mn10300/mm/misalignment.c
@@ -437,7 +437,7 @@ asmlinkage void misalignment(struct pt_regs *regs, enum exception_code code)
 
 	info.si_signo	= SIGSEGV;
 	info.si_errno	= 0;
-	info.si_code	= 0;
+	info.si_code	= SEGV_MAPERR;
 	info.si_addr	= (void *) regs->pc;
 	force_sig_info(SIGSEGV, &info, current);
 	return;
-- 
2.14.1