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(parent: 63d2421) | patch
x86: Restrict MSR access when securelevel is set
authorMatthew Garrett <mjg59@srcf.ucam.org>
Fri, 8 Feb 2013 19:12:13 +0000 (11:12 -0800)
committerBen Hutchings <ben@decadent.org.uk>
Thu, 28 Sep 2017 17:27:56 +0000 (18:27 +0100)
commit8c2b5cd27b55c60d4eb7e77fc9ac1ab1ab204196
tree315349b7c41981ff4858347e580c586c7bfe79b2tree | snapshot
parent63d24210dae75553f8b16a5cf566deb72aaf7989commit | diff
x86: Restrict MSR access when securelevel is set

Permitting write access to MSRs allows userspace to modify the running
kernel. Prevent this if securelevel has been set. Based on a patch by Kees
Cook.

Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Matthew Garrett <mjg59@srcf.ucam.org>
Gbp-Pq: Topic features/all/securelevel
Gbp-Pq: Name x86-restrict-msr-access-when-securelevel-is-set.patch
arch/x86/kernel/msr.c diff | blob | history
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