Date: Sat, 3 Feb 2001 17:52:11 -0800 (PST) From: Ian Dowse <iedowse@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/ufs/ufs ufs_lookup.c Message-ID: <200102040152.f141qB433351@freefall.freebsd.org>
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iedowse 2001/02/03 17:52:11 PST
Modified files:
sys/ufs/ufs ufs_lookup.c
Log:
Extend the sanity checks in ufs_lookup to ensure that each directory
entry fits within its DIRBLKSIZ block. The surrounding code is
extremely fragile with respect to corruption of the directory entry
'd_reclen' field; if directory corruption occurs, it can blindly
scan forward beyond the end of the filesystem block. Usually this
results in a 'fault on nofault entry' panic.
Directory corruption is now much more likely to be detected, resulting
in a 'ufs_dirbad' panic. If the filesystem is read-only, it will
simply print a warning message, and skip the corrupted block.
Reviewed by: mckusick
Revision Changes Path
1.45 +3 -2 src/sys/ufs/ufs/ufs_lookup.c
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