From: Eric W. Biederman <ebiederm@xmission.com>
Date: Tue, 1 Aug 2017 10:02:38 +0000 (-0500)
Subject: mn10300/misalignment: Use SIGSEGV SEGV_MAPERR to report a failed user copy
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2aa8dcc6c0fed640aac249e2edac2013b797cc1c;p=pandora-kernel.git

mn10300/misalignment: Use SIGSEGV SEGV_MAPERR to report a failed user copy

commit 6ac1dc736b323011a55ecd1fc5897c24c4f77cbd upstream.

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.

Fixes: b920de1b77b7 ("mn10300: add the MN10300/AM33 architecture to the kernel")
Cc: David Howells <dhowells@redhat.com>
Cc: Masakazu Urade <urade.masakazu@jp.panasonic.com>
Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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