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    SubjectRe: [PATCH] set*uid() must not fail-and-return on OOM/rlimits
    Date
    Solar Designer <solar@openwall.com> writes in gmane.linux.kernel

    > Attached is a trivial patch (extracted from 2.4.33-ow1) that makes
    > set*uid() kill the current process rather than proceed with -EAGAIN when
    > the kernel is running out of memory. Apparently, alloc_uid() can't fail
    > and return anyway due to properties of the allocator, in which case the
    > patch does not change a thing. But better safe than sorry.
    >
    > As you're probably aware, 2.6 kernels are affected to a greater extent,
    > where set*uid() may also fail on trying to exceed RLIMIT_NPROC. That
    > needs to be fixed, too.
    >
    > Opinions are welcome.

    Perhaps stupid suggestion:

    Should there be new signal for 'failure to drop privileges' ?
    ( perhaps SIGPRIV or is this name free )

    By default signal terminates process.

    By setting this to SIG_IGN this allows deamons handle situation when
    becoming to user failed and give proper error message.

    Still unaware root processes are killed and not causing privilge escalation.

    / Kari Hurtta

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