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    SubjectRe: [PATCH] new syscall: flink
    On 7 Apr 2003 06:43:40 GMT
    daw@mozart.cs.berkeley.edu (David Wagner) wrote:

    > 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?
    open("/proc/self/fd/3", O_RDWR) -- i thought, it just makes a copy for fd/3, and fd/3 should have the same permissions as it was opened.

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