On Wed, Mar 21, 2018 at 11:01:13PM -0700, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
>
> Refactor the bmap validator into a more complete helper that looks for
> extents that run off the end of the device, overflow into the next AG,
> or have invalid flag states.
>
> Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> ---
> v2: defer repair-oriented wrappers until they're needed
> ---
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
> fs/xfs/libxfs/xfs_bmap.c | 46 +++++++++++++++++++++++++++++++++++++---
> fs/xfs/libxfs/xfs_bmap.h | 3 +++
> fs/xfs/libxfs/xfs_bmap_btree.h | 14 ------------
> fs/xfs/libxfs/xfs_inode_fork.c | 12 +++++++---
> 4 files changed, 54 insertions(+), 21 deletions(-)
>
> diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
> index daae00e..91214f2 100644
> --- a/fs/xfs/libxfs/xfs_bmap.c
> +++ b/fs/xfs/libxfs/xfs_bmap.c
> @@ -1261,11 +1261,15 @@ xfs_iread_extents(
> */
> frp = XFS_BMBT_REC_ADDR(mp, block, 1);
> for (j = 0; j < num_recs; j++, frp++, i++) {
> + xfs_failaddr_t fa;
> +
> xfs_bmbt_disk_get_all(frp, &new);
> - if (!xfs_bmbt_validate_extent(mp, whichfork, &new)) {
> - XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
> - XFS_ERRLEVEL_LOW, mp);
> + fa = xfs_bmap_validate_extent(ip, whichfork, &new);
> + if (fa) {
> error = -EFSCORRUPTED;
> + xfs_inode_verifier_error(ip, error,
> + "xfs_iread_extents(2)",
> + frp, sizeof(*frp), fa);
> goto out_brelse;
> }
> xfs_iext_insert(ip, &icur, &new, state);
> @@ -6154,3 +6158,39 @@ xfs_bmap_finish_one(
>
> return error;
> }
> +
> +/* Check that an inode's extent does not have invalid flags or bad ranges. */
> +xfs_failaddr_t
> +xfs_bmap_validate_extent(
> + struct xfs_inode *ip,
> + int whichfork,
> + struct xfs_bmbt_irec *irec)
> +{
> + struct xfs_mount *mp = ip->i_mount;
> + xfs_fsblock_t endfsb;
> + bool isrt;
> +
> + isrt = XFS_IS_REALTIME_INODE(ip);
> + endfsb = irec->br_startblock + irec->br_blockcount - 1;
> + if (isrt) {
> + if (!xfs_verify_rtbno(mp, irec->br_startblock))
> + return __this_address;
> + if (!xfs_verify_rtbno(mp, endfsb))
> + return __this_address;
> + } else {
> + if (!xfs_verify_fsbno(mp, irec->br_startblock))
> + return __this_address;
> + if (!xfs_verify_fsbno(mp, endfsb))
> + return __this_address;
> + if (XFS_FSB_TO_AGNO(mp, irec->br_startblock) !=
> + XFS_FSB_TO_AGNO(mp, endfsb))
> + return __this_address;
> + }
> + if (irec->br_state != XFS_EXT_NORM) {
> + if (whichfork != XFS_DATA_FORK)
> + return __this_address;
> + if (!xfs_sb_version_hasextflgbit(&mp->m_sb))
> + return __this_address;
> + }
> + return NULL;
> +}
> diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h
> index e36d757..f3be641 100644
> --- a/fs/xfs/libxfs/xfs_bmap.h
> +++ b/fs/xfs/libxfs/xfs_bmap.h
> @@ -274,4 +274,7 @@ static inline int xfs_bmap_fork_to_state(int whichfork)
> }
> }
>
> +xfs_failaddr_t xfs_bmap_validate_extent(struct xfs_inode *ip, int whichfork,
> + struct xfs_bmbt_irec *irec);
> +
> #endif /* __XFS_BMAP_H__ */
> diff --git a/fs/xfs/libxfs/xfs_bmap_btree.h b/fs/xfs/libxfs/xfs_bmap_btree.h
> index 135b8c5..e450574 100644
> --- a/fs/xfs/libxfs/xfs_bmap_btree.h
> +++ b/fs/xfs/libxfs/xfs_bmap_btree.h
> @@ -118,18 +118,4 @@ extern int xfs_bmbt_change_owner(struct xfs_trans *tp, struct xfs_inode *ip,
> extern struct xfs_btree_cur *xfs_bmbt_init_cursor(struct xfs_mount *,
> struct xfs_trans *, struct xfs_inode *, int);
>
> -/*
> - * Check that the extent does not contain an invalid unwritten extent flag.
> - */
> -static inline bool xfs_bmbt_validate_extent(struct xfs_mount *mp, int whichfork,
> - struct xfs_bmbt_irec *irec)
> -{
> - if (irec->br_state == XFS_EXT_NORM)
> - return true;
> - if (whichfork == XFS_DATA_FORK &&
> - xfs_sb_version_hasextflgbit(&mp->m_sb))
> - return true;
> - return false;
> -}
> -
> #endif /* __XFS_BMAP_BTREE_H__ */
> diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c
> index 866d2861..613fba2 100644
> --- a/fs/xfs/libxfs/xfs_inode_fork.c
> +++ b/fs/xfs/libxfs/xfs_inode_fork.c
> @@ -245,10 +245,14 @@ xfs_iformat_extents(
>
> xfs_iext_first(ifp, &icur);
> for (i = 0; i < nex; i++, dp++) {
> + xfs_failaddr_t fa;
> +
> xfs_bmbt_disk_get_all(dp, &new);
> - if (!xfs_bmbt_validate_extent(mp, whichfork, &new)) {
> - XFS_ERROR_REPORT("xfs_iformat_extents(2)",
> - XFS_ERRLEVEL_LOW, mp);
> + fa = xfs_bmap_validate_extent(ip, whichfork, &new);
> + if (fa) {
> + xfs_inode_verifier_error(ip, -EFSCORRUPTED,
> + "xfs_iformat_extents(2)",
> + dp, sizeof(*dp), fa);
> return -EFSCORRUPTED;
> }
>
> @@ -595,7 +599,7 @@ xfs_iextents_copy(
> for_each_xfs_iext(ifp, &icur, &rec) {
> if (isnullstartblock(rec.br_startblock))
> continue;
> - ASSERT(xfs_bmbt_validate_extent(ip->i_mount, whichfork, &rec));
> + ASSERT(xfs_bmap_validate_extent(ip, whichfork, &rec) == NULL);
> xfs_bmbt_disk_set_all(dp, &rec);
> trace_xfs_write_extent(ip, &icur, state, _RET_IP_);
> copied += sizeof(struct xfs_bmbt_rec);
> --
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