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  • linux-arm
  • linux-iv
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  • linux-iv
  • arch
  • x86
  • include
  • asm
  • msr.h
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  • Dan Williams's avatar
    x86: Introduce barrier_nospec · b3d7ad85
    Dan Williams authored Jan 29, 2018
    
    
    Rename the open coded form of this instruction sequence from
    rdtsc_ordered() into a generic barrier primitive, barrier_nospec().
    
    One of the mitigations for Spectre variant1 vulnerabilities is to fence
    speculative execution after successfully validating a bounds check. I.e.
    force the result of a bounds check to resolve in the instruction pipeline
    to ensure speculative execution honors that result before potentially
    operating on out-of-bounds data.
    
    No functional changes.
    
    Suggested-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    Suggested-by: default avatarAndi Kleen <ak@linux.intel.com>
    Suggested-by: default avatarIngo Molnar <mingo@redhat.com>
    Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
    Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
    Cc: linux-arch@vger.kernel.org
    Cc: Tom Lendacky <thomas.lendacky@amd.com>
    Cc: Kees Cook <keescook@chromium.org>
    Cc: kernel-hardening@lists.openwall.com
    Cc: gregkh@linuxfoundation.org
    Cc: Al Viro <viro@zeniv.linux.org.uk>
    Cc: alan@linux.intel.com
    Link: https://lkml.kernel.org/r/151727415361.33451.9049453007262764675.stgit@dwillia2-desk3.amr.corp.intel.com
    b3d7ad85