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Check user access rights only if `uio_segflg' says it's a user space buffer.

This commit is contained in:
pk 1996-06-13 22:30:18 +00:00
parent e2655dd7cc
commit 7b9f9e5426
1 changed files with 7 additions and 5 deletions
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12
sys/kern/kern_physio.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_physio.c,v 1.26 1996/02/04 02:15:51 christos Exp $ */
/* $NetBSD: kern_physio.c,v 1.27 1996/06/13 22:30:18 pk Exp $ */
/*-
* Copyright (c) 1994 Christopher G. Demetriou
@ -92,10 +92,12 @@ physio(strategy, bp, dev, flags, minphys, uio)
* writing, so we ignore the uio's rw parameter. Also note that if
* we're doing a read, that's a *write* to user-space.
*/
for (i = 0; i < uio->uio_iovcnt; i++)
if (!useracc(uio->uio_iov[i].iov_base, uio->uio_iov[i].iov_len,
(flags == B_READ) ? B_WRITE : B_READ))
return (EFAULT);
if (uio->uio_segflg == UIO_USERSPACE)
for (i = 0; i < uio->uio_iovcnt; i++)
if (!useracc(uio->uio_iov[i].iov_base,
uio->uio_iov[i].iov_len,
(flags == B_READ) ? B_WRITE : B_READ))
return (EFAULT);
/* Make sure we have a buffer, creating one if necessary. */
if ((nobuf = (bp == NULL)) != 0)