Patch "mn10300/misalignment: Use SIGSEGV SEGV_MAPERR to report a failed user copy" has been added to the 4.4-stable tree

Patch "mn10300/misalignment: Use SIGSEGV SEGV_MAPERR to report a failed user copy" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

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

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mn10300-misalignment-use-sigsegv-segv_maperr-to-report-a-failed-user-copy.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 6ac1dc736b323011a55ecd1fc5897c24c4f77cbd Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Tue, 1 Aug 2017 05:02:38 -0500
Subject: mn10300/misalignment: Use SIGSEGV SEGV_MAPERR to report a failed user copy

From: Eric W. Biederman <ebiederm@xmission.com>

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/mn10300/mm/misalignment.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/mn10300/mm/misalignment.c
+++ b/arch/mn10300/mm/misalignment.c
@@ -437,7 +437,7 @@ transfer_failed:
 
 	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;


Patches currently in stable-queue which might be from ebiederm@xmission.com are

queue-4.4/netfilter-nf_queue-make-the-queue_handler-pernet.patch
queue-4.4/signal-openrisc-fix-do_unaligned_access-to-send-the-proper-signal.patch
queue-4.4/signal-sh-ensure-si_signo-is-initialized-in-do_divide_error.patch
queue-4.4/mn10300-misalignment-use-sigsegv-segv_maperr-to-report-a-failed-user-copy.patch