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CVE-2015-2666 execution in the early microcode loader (rhbz 1204724 1204722)

This commit is contained in:
Josh Boyer 2015-03-23 09:16:48 -04:00
parent 91fac7ba57
commit 3b4fe48582
2 changed files with 45 additions and 0 deletions
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9
kernel.spec
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@ -795,6 +795,9 @@ Patch26168: HID-multitouch-add-support-of-clickpads.patch
Patch26170: acpi-video-Allow-forcing-native-backlight-on-non-win.patch
Patch26171: acpi-video-Add-force-native-backlight-quirk-for-Leno.patch
#CVE-2015-2666 rhbz 1204724 1204722
Patch26172: x86-microcode-intel-Guard-against-stack-overflow-in-.patch
# END OF PATCH DEFINITIONS
%endif
@ -1553,6 +1556,9 @@ ApplyPatch HID-multitouch-add-support-of-clickpads.patch
ApplyPatch acpi-video-Allow-forcing-native-backlight-on-non-win.patch
ApplyPatch acpi-video-Add-force-native-backlight-quirk-for-Leno.patch
#CVE-2015-2666 rhbz 1204724 1204722
ApplyPatch x86-microcode-intel-Guard-against-stack-overflow-in-.patch
%if 0%{?aarch64patches}
ApplyPatch kernel-arm64.patch
%ifnarch aarch64 # this is stupid, but i want to notice before secondary koji does.
@ -2371,6 +2377,9 @@ fi
# ||----w |
# || ||
%changelog
* Mon Mar 23 2015 Josh Boyer <jwboyer@fedoraproject.org>
- CVE-2015-2666 execution in the early microcode loader (rhbz 1204724 1204722)
* Fri Mar 20 2015 Josh Boyer <jwboyer@fedoraproject.org>
- Fix brightness on Lenovo Ideapad Z570 (rhbz 1187004)

36
x86-microcode-intel-Guard-against-stack-overflow-in-.patch Normal file
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@ -0,0 +1,36 @@
From 4423997d1e2f479f98b8f0c7ad733607f361ed76 Mon Sep 17 00:00:00 2001
From: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Date: Tue, 3 Feb 2015 13:00:22 +0100
Subject: [PATCH] x86/microcode/intel: Guard against stack overflow in the
loader
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 <quentin.casasnovas@oracle.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/1422964824-22056-1-git-send-email-quentin.casasnovas@oracle.com
Signed-off-by: Borislav Petkov <bp@suse.de>
---
arch/x86/kernel/cpu/microcode/intel_early.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/microcode/intel_early.c b/arch/x86/kernel/cpu/microcode/intel_early.c
index ec9df6f9cd47..5e109a31f62b 100644
--- a/arch/x86/kernel/cpu/microcode/intel_early.c
+++ b/arch/x86/kernel/cpu/microcode/intel_early.c
@@ -321,7 +321,7 @@ get_matching_model_microcode(int cpu, unsigned long start,
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);
--
2.1.0