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(parent: a9f1803) | patch
x86, smap: Don't enable SMAP if CONFIG_X86_SMAP is disabled
authorH. Peter Anvin <hpa@linux.intel.com>
Thu, 13 Feb 2014 15:34:30 +0000 (07:34 -0800)
committerH. Peter Anvin <hpa@linux.intel.com>
Thu, 13 Feb 2014 15:50:25 +0000 (07:50 -0800)
commit03bbd596ac04fef47ce93a730b8f086d797c3021
tree763dcbb9bab4588640392226e06789bc688db565tree | snapshot (tar.gz zip)
parenta9f180345f5378ac87d80ed0bea55ba421d83859commit | diff
x86, smap: Don't enable SMAP if CONFIG_X86_SMAP is disabled

If SMAP support is not compiled into the kernel, don't enable SMAP in
CR4 -- in fact, we should clear it, because the kernel doesn't contain
the proper STAC/CLAC instructions for SMAP support.

Found by Fengguang Wu's test system.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Link: http://lkml.kernel.org/r/20140213124550.GA30497@localhost
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: <stable@vger.kernel.org> # v3.7+
arch/x86/kernel/cpu/common.c diff | blob | blame | history