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(parent: b20130b) | 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>
Mon, 27 Feb 2017 15:58:07 +0000 (15:58 +0000)
commit1e4c365923345a6f1f77021443462a6199f7ff28
tree6bd3b0cea38dcbb89495a20f9b2509809ef272ebtree | snapshot
parentb20130b241ac70ccf9c635c84106a5ca99b18152commit | 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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