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(parent: 1ddf663) | 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)
committerSalvatore Bonaccorso <carnil@debian.org>
Sun, 6 Aug 2017 04:24:47 +0000 (05:24 +0100)
commitc10f450959d2f965d5689fe0e8ee7ad5faa3be41
treeb43651a4f35ea4e7282e77fbaa03cdd1f4d18287tree | snapshot
parent1ddf6638456b9dd2c215b7b25ea50abdcc92b53ccommit | 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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