| Message ID | 20180510231359.16899-3-mcgrof@kernel.org |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | vfs: detect symlink corruption with attributes | expand |
On Thu, May 10, 2018 at 04:13:57PM -0700, Luis R. Rodriguez wrote: > The Linux VFS does not allow a way to set append/immuttable attributes > to symlinks, this is just not possible. If this is detected we can > correct this with xfs_repair, so inform the user. > > Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org> > --- > fs/xfs/libxfs/xfs_symlink_remote.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/fs/xfs/libxfs/xfs_symlink_remote.c b/fs/xfs/libxfs/xfs_symlink_remote.c > index 5ef5f354587e..42dd81ede3d6 100644 > --- a/fs/xfs/libxfs/xfs_symlink_remote.c > +++ b/fs/xfs/libxfs/xfs_symlink_remote.c > @@ -242,5 +242,10 @@ xfs_symlink_shortform_verify( > /* We /did/ null-terminate the buffer, right? */ > if (*endp != 0) > return __this_address; > + > + /* Immutable and append flags are not allowed on symlinks */ > + if (ip->i_d.di_flags & (XFS_DIFLAG_APPEND | XFS_DIFLAG_IMMUTABLE)) > + return __this_address; This belongs in xfs_dinode_verify so that it checks all symlinks, not just the one shortform ones. --D > + > return NULL; > } > -- > 2.17.0 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-xfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/fs/xfs/libxfs/xfs_symlink_remote.c b/fs/xfs/libxfs/xfs_symlink_remote.c index 5ef5f354587e..42dd81ede3d6 100644 --- a/fs/xfs/libxfs/xfs_symlink_remote.c +++ b/fs/xfs/libxfs/xfs_symlink_remote.c @@ -242,5 +242,10 @@ xfs_symlink_shortform_verify( /* We /did/ null-terminate the buffer, right? */ if (*endp != 0) return __this_address; + + /* Immutable and append flags are not allowed on symlinks */ + if (ip->i_d.di_flags & (XFS_DIFLAG_APPEND | XFS_DIFLAG_IMMUTABLE)) + return __this_address; + return NULL; }
The Linux VFS does not allow a way to set append/immuttable attributes to symlinks, this is just not possible. If this is detected we can correct this with xfs_repair, so inform the user. Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org> --- fs/xfs/libxfs/xfs_symlink_remote.c | 5 +++++ 1 file changed, 5 insertions(+)