Patch "x86/cpuid: Prevent out of bound access in do_clear_cpu_cap()" has been added to the 4.14-stable tree

[<gregkh@linuxfoundation.org>]

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

    x86/cpuid: Prevent out of bound access in do_clear_cpu_cap()

to the 4.14-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-cpuid-prevent-out-of-bound-access-in-do_clear_cpu_cap.patch
and it can be found in the queue-4.14 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 57b8b1a1856adaa849d02d547411a553a531022b Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 18 Oct 2017 19:39:35 +0200
Subject: x86/cpuid: Prevent out of bound access in do_clear_cpu_cap()

From: Thomas Gleixner <tglx@linutronix.de>

commit 57b8b1a1856adaa849d02d547411a553a531022b upstream.

do_clear_cpu_cap() allocates a bitmap to keep track of disabled feature
dependencies. That bitmap is sized NCAPINTS * BITS_PER_INIT. The possible
'features' which can be handed in are larger than this, because after the
capabilities the bug 'feature' bits occupy another 32bit. Not really
obvious...

So clearing any of the misfeature bits, as 32bit does for the F00F bug,
accesses that bitmap out of bounds thereby corrupting the stack.

Size the bitmap proper and add a sanity check to catch accidental out of
bound access.

Fixes: 0b00de857a64 ("x86/cpuid: Add generic table for CPUID dependencies")
Reported-by: kernel test robot <xiaolong.ye@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Link: https://lkml.kernel.org/r/20171018022023.GA12058@yexl-desktop
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/x86/kernel/cpu/cpuid-deps.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

--- a/arch/x86/kernel/cpu/cpuid-deps.c
+++ b/arch/x86/kernel/cpu/cpuid-deps.c
@@ -75,11 +75,17 @@ static inline void clear_feature(struct
 		__clear_cpu_cap(c, feature);
 }
 
+/* Take the capabilities and the BUG bits into account */
+#define MAX_FEATURE_BITS ((NCAPINTS + NBUGINTS) * sizeof(u32) * 8)
+
 static void do_clear_cpu_cap(struct cpuinfo_x86 *c, unsigned int feature)
 {
-	bool changed;
-	DECLARE_BITMAP(disable, NCAPINTS * sizeof(u32) * 8);
+	DECLARE_BITMAP(disable, MAX_FEATURE_BITS);
 	const struct cpuid_dep *d;
+	bool changed;
+
+	if (WARN_ON(feature >= MAX_FEATURE_BITS))
+		return;
 
 	clear_feature(c, feature);
 


Patches currently in stable-queue which might be from tglx@linutronix.de are

queue-4.14/x86-asm-remove-unnecessary-n-t-in-front-of-cc_set-from-asm-templates.patch
queue-4.14/x86-cpuid-add-generic-table-for-cpuid-dependencies.patch
queue-4.14/objtool-don-t-report-end-of-section-error-after-an-empty-unwind-hint.patch
queue-4.14/x86-cpufeatures-enable-new-sse-avx-avx512-cpu-features.patch
queue-4.14/x86-cpuid-prevent-out-of-bound-access-in-do_clear_cpu_cap.patch
queue-4.14/x86-cpufeatures-re-tabulate-the-x86_feature-definitions.patch
queue-4.14/x86-cpuid-replace-set-clear_bit32.patch