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    SubjectRe: [PATCH] new syscall: flink
    Date
    H. Peter Anvin wrote:
    >Here is a better piece of sample code that actually shows a
    >permissions violation happening:
    >
    >[...]
    >mkdir("testdir", 0700) = 0
    >open("testdir/testfile", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3
    >write(3, "Ansiktsburk\n", 12) = 12
    >close(3) = 0
    >open("testdir/testfile", O_RDONLY) = 3
    >chmod("testdir", 0) = 0
    >open("/proc/self/fd/3", O_RDWR) = 4
    >write(4, "Tjo fidelittan hatt!\n", 21) = 21

    You're right! Good point. I retract the comments in my previous email.
    (I did try an experiment like this, but apparently not the right one.)

    My conclusion: /proc/*/fd is a security hole. It should be fixed.
    Do you agree?
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