From: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Date: Tue, 3 Feb 2015 12:00:24 +0000 (+0100)
Subject: x86/microcode/intel: Handle truncated microcode images more robustly
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~25^2~1^2
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=35a9ff4eec7a1725ac4364972fc6c156e4feedd0;p=pandora-kernel.git

x86/microcode/intel: Handle truncated microcode images more robustly

We do not check the input data bounds containing the microcode before
copying a struct microcode_intel_header from it. A specially crafted
microcode could cause the kernel to read invalid memory and lead to a
denial-of-service.

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/1422964824-22056-3-git-send-email-quentin.casasnovas@oracle.com
[ Made error message differ from the next one and flipped comparison. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
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