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(parent: 3084fd4) | 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>
Sat, 28 Jan 2017 16:11:16 +0000 (16:11 +0000)
commitf9cda9d72a9083ec8f482e11ebc31eb23e3b1a83
tree9defa41a09a60143c0ee776516fc867036ce79abtree | snapshot
parent3084fd465980de5b710b11a18bfd2cf421b68bcacommit | 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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