Patch "x86: Reject x32 executables if x32 ABI not supported" has been added to the 3.14-stable tree

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

    x86: Reject x32 executables if x32 ABI not supported

to the 3.14-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:
     x86-reject-x32-executables-if-x32-abi-not-supported.patch
and it can be found in the queue-3.14 subdirectory.

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


>From 0e6d3112a4e95d55cf6dca88f298d5f4b8f29bd1 Mon Sep 17 00:00:00 2001
From: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Date: Sun, 7 Sep 2014 21:05:05 +0100
Subject: x86: Reject x32 executables if x32 ABI not supported

From: Ben Hutchings <ben@xxxxxxxxxxxxxxx>

commit 0e6d3112a4e95d55cf6dca88f298d5f4b8f29bd1 upstream.

It is currently possible to execve() an x32 executable on an x86_64
kernel that has only ia32 compat enabled.  However all its syscalls
will fail, even _exit().  This usually causes it to segfault.

Change the ELF compat architecture check so that x32 executables are
rejected if we don't support the x32 ABI.

Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1410120305.6822.9.camel@xxxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/x86/include/asm/elf.h |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/arch/x86/include/asm/elf.h
+++ b/arch/x86/include/asm/elf.h
@@ -155,8 +155,9 @@ do {						\
 #define elf_check_arch(x)			\
 	((x)->e_machine == EM_X86_64)
 
-#define compat_elf_check_arch(x)		\
-	(elf_check_arch_ia32(x) || (x)->e_machine == EM_X86_64)
+#define compat_elf_check_arch(x)					\
+	(elf_check_arch_ia32(x) ||					\
+	 (IS_ENABLED(CONFIG_X86_X32_ABI) && (x)->e_machine == EM_X86_64))
 
 #if __USER32_DS != __USER_DS
 # error "The following code assumes __USER32_DS == __USER_DS"


Patches currently in stable-queue which might be from ben@xxxxxxxxxxxxxxx are

queue-3.14/x86-reject-x32-executables-if-x32-abi-not-supported.patch
queue-3.14/drivers-net-ipv6-select-ipv6-fragment-idents-for-virtio-ufo-packets.patch
queue-3.14/drivers-net-disable-ufo-through-virtio.patch
queue-3.14/drivers-net-macvtap-and-tun-depend-on-inet.patch
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