• Ricardo Neri's avatar
    x86/cpufeature: Add User-Mode Instruction Prevention definitions · 3522c2a6
    Ricardo Neri authored
    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.
    Signed-off-by: default avatarRicardo Neri <ricardo.neri-calderon@linux.intel.com>
    Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
    Reviewed-by: default avatarBorislav Petkov <bp@suse.de>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Chen Yucong <slaoub@gmail.com>
    Cc: Chris Metcalf <cmetcalf@mellanox.com>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: Denys Vlasenko <dvlasenk@redhat.com>
    Cc: Fenghua Yu <fenghua.yu@intel.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Huang Rui <ray.huang@amd.com>
    Cc: Jiri Slaby <jslaby@suse.cz>
    Cc: Jonathan Corbet <corbet@lwn.net>
    Cc: Josh Poimboeuf <jpoimboe@redhat.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Masami Hiramatsu <mhiramat@kernel.org>
    Cc: Michael S. Tsirkin <mst@redhat.com>
    Cc: Paolo Bonzini <pbonzini@redhat.com>
    Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Ravi V. Shankar <ravi.v.shankar@intel.com>
    Cc: Shuah Khan <shuah@kernel.org>
    Cc: Tony Luck <tony.luck@intel.com>
    Cc: Vlastimil Babka <vbabka@suse.cz>
    Cc: ricardo.neri@intel.com
    Link: http://lkml.kernel.org/r/1509935277-22138-7-git-send-email-ricardo.neri-calderon@linux.intel.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    3522c2a6
cpufeatures.h 20 KB