mirror/freebsd
1
0
Fork 0
mirror of https://git.FreeBSD.org/src.git synced 2025-01-27 16:39:08 +00:00
Code Issues Releases Activity

Replace use of random() with arc4random() to provide less guessable

Browse Source 
values for the initial inode generation numbers in newfs and for
newly allocated inode generation numbers in the kernel.

Submitted by:	Theo de Raadt <deraadt@cvs.openbsd.org>
Sponsored by:   DARPA & NAI Labs.
This commit is contained in:
Kirk McKusick 2003-02-14 21:31:58 +00:00
parent 363c185255
commit aca3e4974f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=110885
3 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
sbin/newfs/mkfs.c
View File

@ -126,7 +126,7 @@ mkfs(struct partition *pp, char *fsys)
time(&utime);
if (!Rflag && !randinit) {
randinit = 1;
srandomdev();
arc4random_stir();
}
sblock.fs_old_flags = FS_FLAGS_UPDATED;
sblock.fs_flags = 0;
@ -387,7 +387,7 @@ mkfs(struct partition *pp, char *fsys)
sblock.fs_state = 0;
sblock.fs_clean = 1;
sblock.fs_id[0] = (long)utime;
sblock.fs_id[1] = random();
sblock.fs_id[1] = arc4random();
sblock.fs_fsmnt[0] = '\0';
csfrags = howmany(sblock.fs_cssize, sblock.fs_fsize);
sblock.fs_dsize = sblock.fs_size - sblock.fs_sblkno -
@ -649,10 +649,10 @@ initcg(int cylno, time_t utime)
dp2 = (struct ufs2_dinode *)(&iobuf[start]);
for (i = 0; i < acg.cg_initediblk; i++) {
if (sblock.fs_magic == FS_UFS1_MAGIC) {
dp1->di_gen = random();
dp1->di_gen = arc4random();
dp1++;
} else {
dp2->di_gen = random();
dp2->di_gen = arc4random();
dp2++;
}
}
@ -666,7 +666,7 @@ initcg(int cylno, time_t utime)
i += sblock.fs_frag) {
dp1 = (struct ufs1_dinode *)(&iobuf[start]);
for (j = 0; j < INOPB(&sblock); j++) {
dp1->di_gen = random();
dp1->di_gen = arc4random();
dp1++;
}
wtfs(fsbtodb(&sblock, cgimin(&sblock, cylno) + i),

4
sys/ufs/ffs/ffs_alloc.c
View File

@ -879,7 +879,7 @@ ffs_valloc(pvp, mode, cred, vpp)
* Set up a new generation number for this inode.
*/
if (ip->i_gen == 0 || ++ip->i_gen == 0)
ip->i_gen = random() / 2 + 1;
ip->i_gen = arc4random() / 2 + 1;
DIP(ip, i_gen) = ip->i_gen;
if (fs->fs_magic == FS_UFS2_MAGIC) {
vfs_timestamp(&ts);
@ -1630,7 +1630,7 @@ ffs_nodealloccg(ip, cg, ipref, mode)
bzero(ibp->b_data, (int)fs->fs_bsize);
dp2 = (struct ufs2_dinode *)(ibp->b_data);
for (i = 0; i < INOPB(fs); i++) {
dp2->di_gen = random() / 2 + 1;
dp2->di_gen = arc4random() / 2 + 1;
dp2++;
}
bawrite(ibp);

2
sys/ufs/ffs/ffs_vfsops.c
View File

@ -1345,7 +1345,7 @@ ffs_vget(mp, ino, flags, vpp)
* already have one. This should only happen on old filesystems.
*/
if (ip->i_gen == 0) {
ip->i_gen = random() / 2 + 1;
ip->i_gen = arc4random() / 2 + 1;
if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
ip->i_flag |= IN_MODIFIED;
DIP(ip, i_gen) = ip->i_gen;