This is a note to let you know that I've just added the patch titled
x86/microcode/intel: Guard against stack overflow in the loader
to the 3.10-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-microcode-intel-guard-against-stack-overflow-in-the-loader.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From c5988181af3b41381c4d20e08ca6852f99f95417 Mon Sep 17 00:00:00 2001
From: Quentin Casasnovas <[email protected]>
Date: Tue, 3 Feb 2015 13:00:22 +0100
Subject: x86/microcode/intel: Guard against stack overflow in the loader
From: Quentin Casasnovas <[email protected]>
commit f84598bd7c851f8b0bf8cd0d7c3be0d73c432ff4 upstream.
mc_saved_tmp is a static array allocated on the stack, we need to make
sure mc_saved_count stays within its bounds, otherwise we're overflowing
the stack in _save_mc(). A specially crafted microcode header could lead
to a kernel crash or potentially kernel execution.
Signed-off-by: Quentin Casasnovas <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Fenghua Yu <[email protected]>
Link:
http://lkml.kernel.org/r/[email protected]
Signed-off-by: Borislav Petkov <[email protected]>
Signed-off-by: Jiri Slaby <[email protected]>
Signed-off-by: Sheng Yong <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/x86/kernel/microcode_intel_early.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/microcode_intel_early.c
+++ b/arch/x86/kernel/microcode_intel_early.c
@@ -321,7 +321,7 @@ get_matching_model_microcode(int cpu, un
unsigned int mc_saved_count = mc_saved_data->mc_saved_count;
int i;
- while (leftover) {
+ while (leftover && mc_saved_count < ARRAY_SIZE(mc_saved_tmp)) {
mc_header = (struct microcode_header_intel *)ucode_ptr;
mc_size = get_totalsize(mc_header);
Patches currently in stable-queue which might be from
[email protected] are
queue-3.10/x86-microcode-intel-guard-against-stack-overflow-in-the-loader.patch
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