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    Subject[PATCH 3.18 52/59] stackprotector: Increase the per-task stack canarys random range from 32 bits to 64 bits on 64-bit platforms
    Date
    3.18-stable review patch.  If anyone has any objections, please let me know.

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

    From: Daniel Micay <danielmicay@gmail.com>

    commit 5ea30e4e58040cfd6434c2f33dc3ea76e2c15b05 upstream.

    The stack canary is an 'unsigned long' and should be fully initialized to
    random data rather than only 32 bits of random data.

    Signed-off-by: Daniel Micay <danielmicay@gmail.com>
    Acked-by: Arjan van de Ven <arjan@linux.intel.com>
    Acked-by: Rik van Riel <riel@redhat.com>
    Acked-by: Kees Cook <keescook@chromium.org>
    Cc: Arjan van Ven <arjan@linux.intel.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: kernel-hardening@lists.openwall.com
    Link: http://lkml.kernel.org/r/20170504133209.3053-1-danielmicay@gmail.com
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    kernel/fork.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/kernel/fork.c
    +++ b/kernel/fork.c
    @@ -338,7 +338,7 @@ static struct task_struct *dup_task_stru
    set_task_stack_end_magic(tsk);

    #ifdef CONFIG_CC_STACKPROTECTOR
    - tsk->stack_canary = get_random_int();
    + tsk->stack_canary = get_random_long();
    #endif

    /*

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