From: deraadt <deraadt@openbsd.org>
Date: Tue, 8 Apr 1997 09:02:15 +0000 (+0000)
Subject: attempt cd9660 & part/nblks fix
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=60581c90034a2637864b89a076ed3e70be167036;p=openbsd

attempt cd9660 & part/nblks fix
---

diff --git a/sys/arch/vax/vax/disksubr.c b/sys/arch/vax/vax/disksubr.c
index ecb1b062272..26ca3a9049a 100644
--- a/sys/arch/vax/vax/disksubr.c
+++ b/sys/arch/vax/vax/disksubr.c
@@ -70,14 +70,16 @@ bounds_check_with_label(bp, lp, wlabel)
 	struct	disklabel *lp;
 	int	wlabel;
 {
+#define blockpersec(count, lp) ((count) * (((lp)->d_secsize) / DEV_BSIZE))
 	struct partition *p = lp->d_partitions + DISKPART(bp->b_dev);
-	int labelsect = lp->d_partitions[2].p_offset;
-	int maxsz = p->p_size,
-		sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT;
+	int labelsect = blockpersec(lp->d_partitions[2].p_offset, lp) +
+	    LABELSECTOR;
+	int sz = howmany(bp->b_bcount, DEV_BSIZE);
+
 	/* overwriting disk label ? */
-	if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect &&
+	if (bp->b_blkno + p->p_offset <= labelsect &&
 #if LABELSECTOR != 0
-	    bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect &&
+	    bp->b_blkno + p->p_offset + sz > labelsect &&
 #endif
 	    (bp->b_flags & B_READ) == 0 && wlabel == 0) {
 		bp->b_error = EROFS;
@@ -85,23 +87,24 @@ bounds_check_with_label(bp, lp, wlabel)
 	}
 
 	/* beyond partition? */
-	if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) {
-		/* if exactly at end of disk, return an EOF */
-		if (bp->b_blkno == maxsz) {
+	if (bp->b_blkno + sz > blockpersec(p->p_size, lp)) {
+		sz = blockpersec(p->p_size, lp) - bp->b_blkno;
+		if (sz == 0) {
+			/* if exactly at end of disk, return an EOF */
 			bp->b_resid = bp->b_bcount;
 			return(0);
 		}
-		/* or truncate if part of it fits */
-		sz = maxsz - bp->b_blkno;
-		if (sz <= 0) {
+		if (sz < 0) {
 			bp->b_error = EINVAL;
 			goto bad;
 		}
+		/* or truncate if part of it fits */
 		bp->b_bcount = sz << DEV_BSHIFT;
 	}
 
 	/* calculate cylinder for disksort to order transfers with */
-	bp->b_cylin = (bp->b_blkno + p->p_offset) / lp->d_secpercyl;
+	bp->b_cylin = (bp->b_blkno + blockpersec(p->p_offset, lp)) /
+	    lp->d_secpercyl;
 	return(1);
 
 bad:
@@ -178,8 +181,12 @@ readdisklabel(dev, strat, lp, osdep)
 	    dlp <= (struct disklabel *)(bp->b_un.b_addr+DEV_BSIZE-sizeof(*dlp));
 	    dlp = (struct disklabel *)((char *)dlp + sizeof(long))) {
 		if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) {
-			if (msg == NULL)
-				msg = "no disk label";
+			if (msg == NULL) {
+#if defined(CD9660)
+				if (iso_disklabelspoof(dev, strat, lp) != 0)
+#endif
+					msg = "no disk label";
+			}
 		} else if (dlp->d_npartitions > MAXPARTITIONS ||
 			   dkcksum(dlp) != 0)
 			msg = "disk label corrupted";