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    Subject[PATCH 4.14 006/104] kasan: add no_sanitize attribute for clang builds
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Andrey Konovalov <andreyknvl@google.com>

    commit 12c8f25a016dff69ee284aa3338bebfd2cfcba33 upstream.

    KASAN uses the __no_sanitize_address macro to disable instrumentation of
    particular functions. Right now it's defined only for GCC build, which
    causes false positives when clang is used.

    This patch adds a definition for clang.

    Note, that clang's revision 329612 or higher is required.

    [andreyknvl@google.com: remove redundant #ifdef CONFIG_KASAN check]
    Link: http://lkml.kernel.org/r/c79aa31a2a2790f6131ed607c58b0dd45dd62a6c.1523967959.git.andreyknvl@google.com
    Link: http://lkml.kernel.org/r/4ad725cc903f8534f8c8a60f0daade5e3d674f8d.1523554166.git.andreyknvl@google.com
    Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
    Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
    Cc: Alexander Potapenko <glider@google.com>
    Cc: Dmitry Vyukov <dvyukov@google.com>
    Cc: David Rientjes <rientjes@google.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Ingo Molnar <mingo@kernel.org>
    Cc: David Woodhouse <dwmw@amazon.co.uk>
    Cc: Andrey Konovalov <andreyknvl@google.com>
    Cc: Will Deacon <will.deacon@arm.com>
    Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Cc: Paul Lawrence <paullawrence@google.com>
    Cc: Sandipan Das <sandipan@linux.vnet.ibm.com>
    Cc: Kees Cook <keescook@chromium.org>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Sodagudi Prasad <psodagud@codeaurora.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    include/linux/compiler-clang.h | 3 +++
    1 file changed, 3 insertions(+)

    --- a/include/linux/compiler-clang.h
    +++ b/include/linux/compiler-clang.h
    @@ -17,6 +17,9 @@
    */
    #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)

    +#undef __no_sanitize_address
    +#define __no_sanitize_address __attribute__((no_sanitize("address")))
    +
    /* Clang doesn't have a way to turn it off per-function, yet. */
    #ifdef __noretpoline
    #undef __noretpoline

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