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Today's Unix Security Trivia

If you write to a file that is SUID (or SGID) the SUID (and SGID) bits on the file are removed as a security precaution against tampering (unless uid 0 is doing the writing).

(See FreeBSD 5.4 source code, sys/ufs/ffs/ffs_vnops.c:739)

Posted by Tom Limoncelli in Technical Tips

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