On Fri, May 05, 2017 at 11:17:18AM -0700, Ricardo Neri wrote: > User-Mode Instruction Prevention is a security feature present in new > Intel processors that, when set, prevents the execution of a subset of > instructions if such instructions are executed in user mode (CPL > 0). > Attempting to execute such instructions causes a general protection > exception. > > The subset of instructions comprises: > > * SGDT - Store Global Descriptor Table > * SIDT - Store Interrupt Descriptor Table > * SLDT - Store Local Descriptor Table > * SMSW - Store Machine Status Word > * STR - Store Task Register > > This feature is also added to the list of disabled-features to allow > a cleaner handling of build-time configuration. > > Cc: Andy Lutomirski <luto@xxxxxxxxxx> > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: H. Peter Anvin <hpa@xxxxxxxxx> > Cc: Borislav Petkov <bp@xxxxxxx> > Cc: Brian Gerst <brgerst@xxxxxxxxx> > Cc: Chen Yucong <slaoub@xxxxxxxxx> > Cc: Chris Metcalf <cmetcalf@xxxxxxxxxxxx> > Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> > Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx> > Cc: Huang Rui <ray.huang@xxxxxxx> > Cc: Jiri Slaby <jslaby@xxxxxxx> > Cc: Jonathan Corbet <corbet@xxxxxxx> > Cc: Michael S. Tsirkin <mst@xxxxxxxxxx> > Cc: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx> > Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Cc: Ravi V. Shankar <ravi.v.shankar@xxxxxxxxx> > Cc: Shuah Khan <shuah@xxxxxxxxxx> > Cc: Vlastimil Babka <vbabka@xxxxxxx> > Cc: Tony Luck <tony.luck@xxxxxxxxx> > Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx> > Cc: Liang Z. Li <liang.z.li@xxxxxxxxx> > Cc: Alexandre Julliard <julliard@xxxxxxxxxx> > Cc: Stas Sergeev <stsp@xxxxxxx> > Cc: x86@xxxxxxxxxx > Cc: linux-msdos@xxxxxxxxxxxxxxx > > Signed-off-by: Ricardo Neri <ricardo.neri-calderon@xxxxxxxxxxxxxxx> > --- > arch/x86/include/asm/cpufeatures.h | 1 + > arch/x86/include/asm/disabled-features.h | 8 +++++++- > arch/x86/include/uapi/asm/processor-flags.h | 2 ++ > 3 files changed, 10 insertions(+), 1 deletion(-) Reviewed-by: Borislav Petkov <bp@xxxxxxx> -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) -- -- To unsubscribe from this list: send the line "unsubscribe linux-msdos" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html