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x86, smap: Turn on Supervisor Mode Access Prevention

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If Supervisor Mode Access Prevention is available and not disabled by
the user, turn it on.  Also fix the expansion of SMEP (Supervisor Mode
Execution Prevention.)

Signed-off-by: H. Peter Anvin <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
This commit is contained in:
H. Peter Anvin 2012-09-21 12:43:13 -07:00
commit 52b6179ac8
2 changed files with 31 additions and 1 deletions
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6
Documentation/kernel-parameters.txt
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@ -1812,8 +1812,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
noexec=on: enable non-executable mappings (default)
noexec=off: disable non-executable mappings
nosmap [X86]
Disable SMAP (Supervisor Mode Access Prevention)
even if it is supported by processor.
nosmep [X86]
Disable SMEP (Supervisor Mode Execution Protection)
Disable SMEP (Supervisor Mode Execution Prevention)
even if it is supported by processor.
noexec32 [X86-64]