diff options
| author | phk <phk@FreeBSD.org> | 1999-08-21 06:48:16 +0000 |
|---|---|---|
| committer | phk <phk@FreeBSD.org> | 1999-08-21 06:48:16 +0000 |
| commit | 2a4a60dfae5b4436f3f3beb6d425bc4ad0f8c61c (patch) | |
| tree | db81b9006f5a9e2a9078bb3d80db00961c6867f7 /sys/kern | |
| parent | b51f157bff8b959d943b0836a1c57f065b9318d5 (diff) | |
| download | FreeBSD-src-2a4a60dfae5b4436f3f3beb6d425bc4ad0f8c61c.zip FreeBSD-src-2a4a60dfae5b4436f3f3beb6d425bc4ad0f8c61c.tar.gz | |
Detect if the the offset used to read from a raw device loose bits
when converted to block number.
Diffstat (limited to 'sys/kern')
| -rw-r--r-- | sys/kern/kern_physio.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/sys/kern/kern_physio.c b/sys/kern/kern_physio.c index 3455f99..aae8ee9 100644 --- a/sys/kern/kern_physio.c +++ b/sys/kern/kern_physio.c @@ -16,7 +16,7 @@ * 4. Modifications may be freely made to this file if the above conditions * are met. * - * $Id: kern_physio.c,v 1.35 1999/06/26 02:46:02 mckusick Exp $ + * $Id: kern_physio.c,v 1.36 1999/08/14 11:40:42 phk Exp $ */ #include <sys/param.h> @@ -57,6 +57,7 @@ physio(bp, dev, rw, minp, uio) int error; int spl; caddr_t sa; + off_t blockno; int bp_alloc = (bp == 0); struct buf *bpa; @@ -95,7 +96,12 @@ physio(bp, dev, rw, minp, uio) * for the temporary kernel mapping. */ bp->b_saveaddr = sa; - bp->b_blkno = btodb(uio->uio_offset); + blockno = uio->uio_offset >> DEV_BSHIFT; + bp->b_blkno = blockno; + if (bp->b_blkno != blockno) { + error = EINVAL; + goto doerror; + } bp->b_offset = uio->uio_offset; if (uio->uio_segflg == UIO_USERSPACE) { |
