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    SubjectRe: [005/107] sparc: Allow handling signals when stack is corrupted.
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    On Wed, 2011-11-02 at 15:13 -0700, Greg KH wrote:
    > 2.6.32-longterm review patch. If anyone has any objections, please let us know.
    >
    > ------------------
    >
    > From: "David S. Miller" <davem@davemloft.net>
    >
    > commit 5598473a5b40c47a8c5349dd2c2630797169cf1a upstream.
    >
    > If we can't push the pending register windows onto the user's stack,
    > we disallow signal delivery even if the signal would be delivered on a
    > valid seperate signal stack.
    >
    > Add a register window save area in the signal frame, and store any
    > unsavable windows there.
    >
    > On sigreturn, if any windows are still queued up in the signal frame,
    > try to push them back onto the stack and if that fails we kill the
    > process immediately.
    >
    > This allows the debug/tst-longjmp_chk2 glibc test case to pass.
    [...]

    But is there a real application that needs this?

    Ben.

    --
    Ben Hutchings
    Sturgeon's Law: Ninety percent of everything is crap.
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