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    SubjectRe: PROBLEM?: "permission denied" when accessing /proc/self/fd/* after setuid
    Alexey Dobriyan wrote:

    > Something similar was fixed in 2.6.22, but let me check.

    You're right - from <http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.22>:

    commit 8948e11f450e6189a79e47d6051c3d5a0b98e3f3
    Author: Alexey Dobriyan <adobriyan@openvz.org>
    Date: Tue May 8 00:23:35 2007 -0700

    Allow access to /proc/$PID/fd after setuid()

    /proc/$PID/fd has r-x------ permissions, so if process does setuid(), it
    will not be able to access /proc/*/fd/. This breaks fstatat() emulation
    in glibc.

    open("foo", O_RDONLY|O_DIRECTORY) = 4
    setuid32(65534) = 0
    stat64("/proc/self/fd/4/bar", 0xbfafb298) = -1 EACCES (Permission denied)


    However, one of the kernels I tried this on (and failed) was a 2.6.24-19 -
    is it possible this patch was backed out?

    Cheers,
    --dt



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