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    SubjectRe: [PATCH 00/11] ARMv8.3 pointer authentication userspace support
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    On 19/07/17 17:01, Mark Rutland wrote:
    > If authentication fails, bits are set in the pointer such that it is guaranteed
    > to cause a fault if used.

    How does user space know the fault is caused by authentication fail?
    When GDB is debugging a program, and it failed in pointer
    authentication, I assume GDB only knows that the program receives signal
    SIGSEGV, but how does GDB or user know why does the program get SIGSEGV?
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