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(parent: 7a476e1) | 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)
committerYves-Alexis Perez <corsac@debian.org>
Fri, 9 Feb 2018 12:58:52 +0000 (12:58 +0000)
commit006e06e85bb51e1535fcd2907ca1a62b25d0021a
tree0be8a677c92945696b01580245b3de80984feb53tree | snapshot
parent7a476e19559c6e0f9855b5c5050e839850979b67commit | 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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