From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Refactor all the open-coded validation of file block ranges into a
single helper, and teach the bmap scrubber to check the ranges.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/libxfs/xfs_bmap.c | 2 +-
fs/xfs/libxfs/xfs_types.c | 25 +++++++++++++++++++++++++
fs/xfs/libxfs/xfs_types.h | 3 +++
fs/xfs/scrub/bmap.c | 4 ++++
fs/xfs/xfs_bmap_item.c | 2 +-
fs/xfs/xfs_rmap_item.c | 2 +-
6 files changed, 35 insertions(+), 3 deletions(-)
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index 7bcf498ef6b2..dcf56bcafb8f 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -6227,7 +6227,7 @@ xfs_bmap_validate_extent(
{
struct xfs_mount *mp = ip->i_mount;
- if (irec->br_startoff + irec->br_blockcount <= irec->br_startoff)
+ if (!xfs_verify_fileext(mp, irec->br_startoff, irec->br_blockcount))
return __this_address;
if (XFS_IS_REALTIME_INODE(ip) && whichfork == XFS_DATA_FORK) {
diff --git a/fs/xfs/libxfs/xfs_types.c b/fs/xfs/libxfs/xfs_types.c
index 7b310eb296b7..b254fbeaaa50 100644
--- a/fs/xfs/libxfs/xfs_types.c
+++ b/fs/xfs/libxfs/xfs_types.c
@@ -258,3 +258,28 @@ xfs_verify_dablk(
return dabno <= max_dablk;
}
+
+/* Check that a file block offset does not exceed the maximum. */
+bool
+xfs_verify_fileoff(
+ struct xfs_mount *mp,
+ xfs_fileoff_t off)
+{
+ return off <= XFS_MAX_FILEOFF;
+}
+
+/* Check that a range of file block offsets do not exceed the maximum. */
+bool
+xfs_verify_fileext(
+ struct xfs_mount *mp,
+ xfs_fileoff_t off,
+ xfs_fileoff_t len)
+{
+ if (off + len <= off)
+ return false;
+
+ if (!xfs_verify_fileoff(mp, off))
+ return false;
+
+ return xfs_verify_fileoff(mp, off + len - 1);
+}
diff --git a/fs/xfs/libxfs/xfs_types.h b/fs/xfs/libxfs/xfs_types.h
index 18e83ce46568..064bd6e8c922 100644
--- a/fs/xfs/libxfs/xfs_types.h
+++ b/fs/xfs/libxfs/xfs_types.h
@@ -203,5 +203,8 @@ bool xfs_verify_icount(struct xfs_mount *mp, unsigned long long icount);
bool xfs_verify_dablk(struct xfs_mount *mp, xfs_fileoff_t off);
void xfs_icount_range(struct xfs_mount *mp, unsigned long long *min,
unsigned long long *max);
+bool xfs_verify_fileoff(struct xfs_mount *mp, xfs_fileoff_t off);
+bool xfs_verify_fileext(struct xfs_mount *mp, xfs_fileoff_t off,
+ xfs_fileoff_t len);
#endif /* __XFS_TYPES_H__ */
diff --git a/fs/xfs/scrub/bmap.c b/fs/xfs/scrub/bmap.c
index cce8ac7d3973..bce4421acdb9 100644
--- a/fs/xfs/scrub/bmap.c
+++ b/fs/xfs/scrub/bmap.c
@@ -329,6 +329,10 @@ xchk_bmap_iextent(
xchk_fblock_set_corrupt(info->sc, info->whichfork,
irec->br_startoff);
+ if (!xfs_verify_fileext(mp, irec->br_startoff, irec->br_blockcount))
+ xchk_fblock_set_corrupt(info->sc, info->whichfork,
+ irec->br_startoff);
+
xchk_bmap_dirattr_extent(ip, info, irec);
/* There should never be a "hole" extent in either extent list. */
diff --git a/fs/xfs/xfs_bmap_item.c b/fs/xfs/xfs_bmap_item.c
index 5c9706760e68..9a2e54b7ccb9 100644
--- a/fs/xfs/xfs_bmap_item.c
+++ b/fs/xfs/xfs_bmap_item.c
@@ -449,7 +449,7 @@ xfs_bui_validate(
if (!xfs_verify_ino(mp, bmap->me_owner))
return false;
- if (bmap->me_startoff + bmap->me_len <= bmap->me_startoff)
+ if (!xfs_verify_fileext(mp, bmap->me_startoff, bmap->me_len))
return false;
return xfs_verify_fsbext(mp, bmap->me_startblock, bmap->me_len);
diff --git a/fs/xfs/xfs_rmap_item.c b/fs/xfs/xfs_rmap_item.c
index 4fa875237422..49cebd68b672 100644
--- a/fs/xfs/xfs_rmap_item.c
+++ b/fs/xfs/xfs_rmap_item.c
@@ -490,7 +490,7 @@ xfs_rui_validate_map(
!xfs_verify_ino(mp, rmap->me_owner))
return false;
- if (rmap->me_startoff + rmap->me_len <= rmap->me_startoff)
+ if (!xfs_verify_fileext(mp, rmap->me_startoff, rmap->me_len))
return false;
return xfs_verify_fsbext(mp, rmap->me_startblock, rmap->me_len);
