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    SubjectRe: [PATCH 1/3] signal(i386): alternative signal stack wraparound occurs
    KAMEZAWA Hiroyuki wrote::
    > On Thu, 04 Oct 2007 20:56:14 +0900
    > Shi Weihua <shiwh@cn.fujitsu.com> wrote:
    >
    >> stack.ss_sp = addr + pagesize;
    >> stack.ss_flags = 0;
    >> stack.ss_size = pagesize;
    > Here is bad.
    > stack,ss_sp = addr;
    > stack.ss_flags = 0;
    > stack.ss_size = pagesize * 2;
    [What the test code want to do]
    addr+pagesize*2 - addr+pagesize -> sigaltstack
    addr+pagesize - addr -> protected region
    The code want to catch overflow when esp enter the protected region.

    But it failed ...
    >
    > cheers.
    > -Kame
    >
    >
    >

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