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    SubjectRe: 2.2.0 SECURITY
    >There is a bug that works only on the 2.2.0 kernel that will allow root
    >and non-root users to crash the machine (the system reboots).
    >To replicate this bug do following:
    >Take any core file, and as normal user or root run: ldd core
    >The machine will reboot, saying that it cannot get execution permissions
    >for ./core
    >As far as I can tell, this problem only affects x86 machines running
    >2.2.0. I know that PPC is not affected.
    >Note: This problem does not occur in kernels before 2.2.0, and is
    >apparently fixed in 2.2.0ac1.
    >Thanks to Gennady Gurov ( for discovering this problem.

    Occured here: Ppro 200, 48mb RAM, Matrox fb, Soundblaster 16, smbfs,
    IP-masq, using egcs 1.1, ide-scsi, rest is pretty vanilla

    Both on 2.2.0 AND 2.2.0-final

    ldd is from Glibc-2.0.108 (also compiled with egcs 1.1)

    core was from program:
    main() { * (int *) 0 = 0; }

    core perms were 600

    Note, my machine hung hard, with no reboot.
    Error message given:
    free_one_pmd: bad directory entry 000001e3

    Paul Laufer

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