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    SubjectRe: [x86] Access off the bottom of stack causes a segfault?
    Date
    Followup to:  <Pine.LNX.4.53.0310141510590.2211@chaos>
    By author: "Richard B. Johnson" <root@chaos.analogic.com>
    In newsgroup: linux.dev.kernel
    >
    > > main:
    > > mov DWORD PTR [%ESP - 16004], %EBP # Save EBP to stack
    >
    > BAM **INTERRUPT** writes return address below stack-pointer.
    >

    Since we're in user mode, interrupts don't matter, but signals have
    the same effect.

    Note that this is a matter of the ABI definition. For example, in the
    x86-64 ABI there is a designated region of well-defined size below
    %rsp called the redzone, which signals aren't allowed to clobber.

    -hpa
    --
    <hpa@transmeta.com> at work, <hpa@zytor.com> in private!
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