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(parent: 4db5a49) | 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>
Sun, 4 Jun 2017 02:03:01 +0000 (02:03 +0000)
commitd9aa0a99613d18f1157550d457fde87158d96373
tree69278951194e32f087fa4807008eb2c1d06a0471tree | snapshot
parent4db5a497b37bbe17631d8905a42e6430f685c304commit | 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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