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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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