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    SubjectRe: [PATCH 0/4] coredump: core dump masking support v3
    > Kawai, Hidehiro wrote:
    > >This patch series is version 3 of the core dump masking feature,
    > >which provides a per-process flag not to dump anonymous shared
    > >memory segments.
    > I just wanted to remind you that you need to be careful about dumping
    > the [vdso] segment no matter whether you omit other segments. I didn't
    > actually try running your patches, and if the kernel doesn't actually
    > consider this segment anonymous and shared, things might already work
    > fine as is.
    > In any case, you can check with "readelf -a", if the [vdso] segment is
    > there. And you will find that if you forget to dump it, "gdb" can no
    > longer give you stack traces on call chains that involve signal handlers.
    > As an alternative to your kernel patch, you could achieve the same goal
    > in user space, by linking my coredumper
    > into your binaries and
    > setting up appropriate signal handlers. An equivalent patch for
    > selectively omitting memory regions would be trivial to add. While this
    > does give you more flexibility, it of course has the drawback of
    > requiring you to change your applications, so there still is some
    > benefit in a kernelspace solution.

    "We are too lazy to change 0.01% of apps that actually need it" is not
    good enough reason to push the feature into kernel, I'd say.

    (cesky, pictures)
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      Last update: 2007-02-24 12:41    [W:0.020 / U:5.072 seconds]
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