[src/trunk]: src/sbin/newfs Check the number of cylinder group summary area a...

[bouyer <bouyer%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/02f1bf10fcc3
branches:  trunk
changeset: 486435:02f1bf10fcc3
user:      bouyer <bouyer%NetBSD.org@localhost>
date:      Mon May 22 10:33:45 2000 +0000

description:
Check the number of cylinder group summary area against MAXCSBUFS. fsck and
the kernel will happilly trash data after fs_csp[] in the superblock with
a large number of cylinder group.

diffstat:

 sbin/newfs/mkfs.c |  12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)

diffs (33 lines):

diff -r 702f53327a9c -r 02f1bf10fcc3 sbin/newfs/mkfs.c
--- a/sbin/newfs/mkfs.c Mon May 22 10:18:46 2000 +0000
+++ b/sbin/newfs/mkfs.c Mon May 22 10:33:45 2000 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: mkfs.c,v 1.37 1999/07/30 17:44:01 wrstuden Exp $       */
+/*     $NetBSD: mkfs.c,v 1.38 2000/05/22 10:33:45 bouyer Exp $ */
 
 /*
  * Copyright (c) 1980, 1989, 1993
@@ -38,7 +38,7 @@
 #if 0
 static char sccsid[] = "@(#)mkfs.c     8.11 (Berkeley) 5/3/95";
 #else
-__RCSID("$NetBSD: mkfs.c,v 1.37 1999/07/30 17:44:01 wrstuden Exp $");
+__RCSID("$NetBSD: mkfs.c,v 1.38 2000/05/22 10:33:45 bouyer Exp $");
 #endif
 #endif /* not lint */
 
@@ -561,6 +561,14 @@
        sblock.fs_csaddr = cgdmin(&sblock, 0);
        sblock.fs_cssize =
            fragroundup(&sblock, sblock.fs_ncg * sizeof(struct csum));
+       if (sblock.fs_cssize / sblock.fs_bsize > MAXCSBUFS) {
+               printf("With %d cylinder groups %d cylinder group sumary "
+                   "area are needed.\n",
+                   sblock.fs_ncg, sblock.fs_cssize / sblock.fs_bsize);
+               printf("Only %ld are available, reduce the number of cylinder "
+                   "groups.\n", (long)MAXCSBUFS);
+               exit(38);
+       }
        i = sblock.fs_bsize / sizeof(struct csum);
        sblock.fs_csmask = ~(i - 1);
        for (sblock.fs_csshift = 0; i > 1; i >>= 1)