From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: Dave Chinner <david@fromorbit.com>
Cc: linux-xfs@vger.kernel.org
Subject: Re: [PATCH 08/13] xfs: create structure verifier function for short form symlinks
Date: Tue, 19 Dec 2017 12:45:04 -0800 [thread overview]
Message-ID: <20171219204504.GD12613@magnolia> (raw)
In-Reply-To: <20171219052758.GR4094@dastard>
On Tue, Dec 19, 2017 at 04:27:58PM +1100, Dave Chinner wrote:
> On Wed, Dec 13, 2017 at 03:59:01PM -0800, Darrick J. Wong wrote:
> > From: Darrick J. Wong <darrick.wong@oracle.com>
> >
> > Create a function to check the structure of short form symlink targets.
> >
> > Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> > ---
> > fs/xfs/libxfs/xfs_shared.h | 1 +
> > fs/xfs/libxfs/xfs_symlink_remote.c | 36 ++++++++++++++++++++++++++++++++++++
> > 2 files changed, 37 insertions(+)
> >
> >
> > diff --git a/fs/xfs/libxfs/xfs_shared.h b/fs/xfs/libxfs/xfs_shared.h
> > index c6f4eb4..67ccb1a 100644
> > --- a/fs/xfs/libxfs/xfs_shared.h
> > +++ b/fs/xfs/libxfs/xfs_shared.h
> > @@ -143,5 +143,6 @@ bool xfs_symlink_hdr_ok(xfs_ino_t ino, uint32_t offset,
> > uint32_t size, struct xfs_buf *bp);
> > void xfs_symlink_local_to_remote(struct xfs_trans *tp, struct xfs_buf *bp,
> > struct xfs_inode *ip, struct xfs_ifork *ifp);
> > +xfs_failaddr_t xfs_symlink_shortform_verify(struct xfs_inode *ip);
> >
> > #endif /* __XFS_SHARED_H__ */
> > diff --git a/fs/xfs/libxfs/xfs_symlink_remote.c b/fs/xfs/libxfs/xfs_symlink_remote.c
> > index b6ef6cb..5d9642e 100644
> > --- a/fs/xfs/libxfs/xfs_symlink_remote.c
> > +++ b/fs/xfs/libxfs/xfs_symlink_remote.c
> > @@ -210,3 +210,39 @@ xfs_symlink_local_to_remote(
> > xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsymlink_hdr) +
> > ifp->if_bytes - 1);
> > }
> > +
> > +/* Verify the consistency of an inline symlink. */
> > +xfs_failaddr_t
> > +xfs_symlink_shortform_verify(
> > + struct xfs_inode *ip)
> > +{
> > + char *sfp;
> > + char *endp;
> > + struct xfs_ifork *ifp;
> > + int size;
> > +
> > + ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_LOCAL);
> > + ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
> > + sfp = (char *)ifp->if_u1.if_data;
> > + size = ifp->if_bytes;
> > + endp = sfp + size;
> > +
> > + /* Zero length symlinks can exist while we're deleting a remote one. */
> > + if (size == 0)
> > + return NULL;
> > +
> > + /* No negative sizes or overly long symlink targets. */
> > + if (size < 0 || size > XFS_SYMLINK_MAXLEN)
> > + return __this_address;
> > +
> > + /* No NULLs in the target either. */
> > + for (; sfp < endp; sfp++) {
> > + if (*sfp == 0)
> > + return __this_address;
> > + }
>
> if (memchr(sfp, 0, size - 1))
> return __this_address;
Fixed.
--D
> Otherwise looks ok.
>
> Reviewed-by: Dave Chinner <dchinner@redhat.com>
>
> --
> Dave Chinner
> david@fromorbit.com
> --
> To unsubscribe from this list: send the line "unsubscribe linux-xfs" in
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next prev parent reply other threads:[~2017-12-19 20:45 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-13 23:58 [PATCH 00/13] xfs: more and better verifiers Darrick J. Wong
2017-12-13 23:58 ` [PATCH 01/13] xfs: refactor long-format btree header verification routines Darrick J. Wong
2017-12-14 22:06 ` Dave Chinner
2017-12-15 0:12 ` Darrick J. Wong
2017-12-13 23:58 ` [PATCH 02/13] xfs: remove XFS_WANT_CORRUPTED_RETURN from dir3 data verifiers Darrick J. Wong
2017-12-19 3:50 ` Dave Chinner
2017-12-13 23:58 ` [PATCH 03/13] xfs: have buffer verifier functions report failing address Darrick J. Wong
2017-12-19 4:12 ` Dave Chinner
2017-12-19 20:26 ` Darrick J. Wong
2017-12-13 23:58 ` [PATCH 04/13] xfs: refactor verifier callers to print address of failing check Darrick J. Wong
2017-12-14 22:03 ` Dave Chinner
2017-12-15 0:04 ` Darrick J. Wong
2017-12-15 3:09 ` Dave Chinner
2017-12-19 20:29 ` Darrick J. Wong
2017-12-13 23:58 ` [PATCH 05/13] xfs: verify dinode header first Darrick J. Wong
2017-12-19 4:13 ` Dave Chinner
2017-12-13 23:58 ` [PATCH 06/13] xfs: move inode fork verifiers to xfs_dinode_verify Darrick J. Wong
2017-12-19 5:16 ` Dave Chinner
2017-12-19 20:34 ` Darrick J. Wong
2017-12-19 20:48 ` Dave Chinner
2017-12-13 23:58 ` [PATCH 07/13] xfs: create structure verifier function for shortform xattrs Darrick J. Wong
2017-12-19 5:23 ` Dave Chinner
2017-12-19 20:41 ` Darrick J. Wong
2017-12-19 20:51 ` Dave Chinner
2017-12-19 21:04 ` Darrick J. Wong
2017-12-13 23:59 ` [PATCH 08/13] xfs: create structure verifier function for short form symlinks Darrick J. Wong
2017-12-19 5:27 ` Dave Chinner
2017-12-19 20:45 ` Darrick J. Wong [this message]
2017-12-13 23:59 ` [PATCH 09/13] xfs: refactor short form directory structure verifier function Darrick J. Wong
2017-12-19 5:45 ` Dave Chinner
2017-12-13 23:59 ` [PATCH 10/13] xfs: provide a centralized method for verifying inline fork data Darrick J. Wong
2017-12-19 6:06 ` Dave Chinner
2017-12-19 20:50 ` Darrick J. Wong
2017-12-13 23:59 ` [PATCH 11/13] xfs: fail out of xfs_attr3_leaf_lookup_int if it looks corrupt Darrick J. Wong
2017-12-19 6:13 ` Dave Chinner
2017-12-13 23:59 ` [PATCH 12/13] xfs: create a new buf_ops pointer to verify structure metadata Darrick J. Wong
2017-12-19 6:22 ` Dave Chinner
2017-12-19 18:15 ` Darrick J. Wong
2017-12-19 20:53 ` Dave Chinner
2017-12-13 23:59 ` [PATCH 13/13] xfs: scrub in-core metadata Darrick J. Wong
2017-12-19 6:23 ` Dave Chinner
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