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(parent: e99c4d1) | 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>
Tue, 19 Sep 2017 01:34:05 +0000 (02:34 +0100)
commitede619fb9c009a0b7215b056b8c736a901784923
treeb50dfaf06179b80461ba1393cddea4ab328125e7tree | snapshot
parente99c4d1e690ed9fe8835036419ba1824196a4eb1commit | 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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