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Code Issues Releases Activity

Updates to UFS/FFS superblock integrity checks when reading a superblock.

Browse Source 
Further updates based on ways Peter Holm found to corrupt UFS
superblocks in ways that could cause kernel hangs or crashes.

No legitimate superblocks should fail as a result of these changes.

Reported by:  Peter Holm
Tested by:    Peter Holm
Sponsored by: The FreeBSD Foundation
This commit is contained in:
Kirk McKusick 2022-10-03 05:52:17 -07:00
parent db79bf75ac
commit dcdba3460d
1 changed files with 2 additions and 2 deletions
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4
sys/ufs/ffs/ffs_subr.c
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@ -407,7 +407,7 @@ validate_sblock(struct fs *fs, int flags)
FCHK(powerof2(fs->fs_fsize), ==, 0, %jd);
FCHK(fs->fs_sbsize, >, SBLOCKSIZE, %jd);
FCHK(fs->fs_sbsize, <, (signed)sizeof(struct fs), %jd);
FCHK(fs->fs_sbsize % fs->fs_fsize, !=, 0, %jd);
FCHK(fs->fs_sbsize % dbtob(1), !=, 0, %jd);
FCHK(fs->fs_fpg, <, 3 * fs->fs_frag, %jd);
FCHK(fs->fs_ncg, <, 1, %jd);
FCHK(fs->fs_fsbtodb, !=, ILOG2(fs->fs_fsize / sectorsize), %jd);
@ -503,7 +503,7 @@ validate_sblock(struct fs *fs, int flags)
*/
if (error)
return (error);
FCHK(fs->fs_sbsize % fs->fs_fsize, !=, 0, %jd);
FCHK(fs->fs_sbsize % dbtob(1), !=, 0, %jd);
FCHK(fs->fs_ipg % fs->fs_inopb, !=, 0, %jd);
FCHK(fs->fs_sblkno, !=, roundup(
howmany(fs->fs_sblockloc + SBLOCKSIZE, fs->fs_fsize),