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PR/41620 CVS commit: src/sys/kern

The following reply was made to PR lib/41620; it has been noted by GNATS.

From: David Laight <>
Subject: PR/41620 CVS commit: src/sys/kern
Date: Wed, 5 Aug 2009 19:39:50 +0000

 Module Name:   src
 Committed By:  dsl
 Date:          Wed Aug  5 19:39:50 UTC 2009
 Modified Files:
        src/sys/kern: vfs_lockf.c
 Log Message:
 lockf() passes its arguments through to fcntl() but is supposed to
 support -ve lengths (lock area before current offset).
 Nothing in libc or the kernel allowed for this, so some random part
 of the file would get locked (no idea which bits).
 Although this could probably be fixed in libc, the stubs for posix file
 locks for emulations could easily get into the kernel with -ve lengths.
 So fixing in the kernel avoids those problems.
 This also fixes PR/41620 (attempting to lock negative offsets) - which
 is what I was looking into!
 To generate a diff of this commit:
 cvs rdiff -u -r1.71 -r1.72 src/sys/kern/vfs_lockf.c
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

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