This is a note to let you know that I've just added the patch titled
parisc: Avoid function pointers for kernel exception routines
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:
parisc-avoid-function-pointers-for-kernel-exception-routines.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@xxxxxxxxxxxxxxx> know about it.
>From e3893027a300927049efc1572f852201eb785142 Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@xxxxxx>
Date: Fri, 8 Apr 2016 18:11:33 +0200
Subject: parisc: Avoid function pointers for kernel exception routines
From: Helge Deller <deller@xxxxxx>
commit e3893027a300927049efc1572f852201eb785142 upstream.
We want to avoid the kernel module loader to create function pointers
for the kernel fixup routines of get_user() and put_user(). Changing
the external reference from function type to int type fixes this.
This unbreaks exception handling for get_user() and put_user() when
called from a kernel module.
Signed-off-by: Helge Deller <deller@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/parisc/kernel/parisc_ksyms.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
--- a/arch/parisc/kernel/parisc_ksyms.c
+++ b/arch/parisc/kernel/parisc_ksyms.c
@@ -47,11 +47,11 @@ EXPORT_SYMBOL(__cmpxchg_u64);
EXPORT_SYMBOL(lclear_user);
EXPORT_SYMBOL(lstrnlen_user);
-/* Global fixups */
-extern void fixup_get_user_skip_1(void);
-extern void fixup_get_user_skip_2(void);
-extern void fixup_put_user_skip_1(void);
-extern void fixup_put_user_skip_2(void);
+/* Global fixups - defined as int to avoid creation of function pointers */
+extern int fixup_get_user_skip_1;
+extern int fixup_get_user_skip_2;
+extern int fixup_put_user_skip_1;
+extern int fixup_put_user_skip_2;
EXPORT_SYMBOL(fixup_get_user_skip_1);
EXPORT_SYMBOL(fixup_get_user_skip_2);
EXPORT_SYMBOL(fixup_put_user_skip_1);
Patches currently in stable-queue which might be from deller@xxxxxx are
queue-4.4/parisc-fix-kernel-crash-with-reversed-copy_from_user.patch
queue-4.4/parisc-unbreak-handling-exceptions-from-kernel-modules.patch
queue-4.4/parisc-avoid-function-pointers-for-kernel-exception-routines.patch
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