The branch stable/13 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=def8b2b427ea5bff099e70b2a8351312be9e997a
commit def8b2b427ea5bff099e70b2a8351312be9e997a Author: Konstantin Belousov <[email protected]> AuthorDate: 2021-03-01 15:24:11 +0000 Commit: Konstantin Belousov <[email protected]> CommitDate: 2021-03-04 19:07:25 +0000 FFS extattr: fix handling of the tail (cherry picked from commit 8742817ba62ec604156c139727155d36f5fbad06) --- sys/ufs/ffs/ffs_vnops.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-) diff --git a/sys/ufs/ffs/ffs_vnops.c b/sys/ufs/ffs/ffs_vnops.c index af03b369a280..582ccccc2e12 100644 --- a/sys/ufs/ffs/ffs_vnops.c +++ b/sys/ufs/ffs/ffs_vnops.c @@ -1346,13 +1346,20 @@ ffs_rdextattr(u_char **p, struct vnode *vp, struct thread *td) /* Validate disk xattrfile contents. */ for (eap = (void *)eae, eaend = (void *)(eae + easize); eap < eaend; eap = eapnext) { + /* Detect zeroed out tail */ + if (eap->ea_length < sizeof(*eap) || eap->ea_length == 0) { + easize = (const u_char *)eap - eae; + break; + } + eapnext = EXTATTR_NEXT(eap); - /* Bogusly short entry or bogusly long entry. */ - if (eap->ea_length < sizeof(*eap) || eapnext > eaend) { + /* Bogusly long entry. */ + if (eapnext > eaend) { free(eae, M_TEMP); return (EINTEGRITY); } } + ip->i_ea_len = easize; *p = eae; return (0); } @@ -1407,7 +1414,6 @@ ffs_open_ea(struct vnode *vp, struct ucred *cred, struct thread *td) ffs_unlock_ea(vp); return (error); } - ip->i_ea_len = dp->di_extsize; ip->i_ea_error = 0; ip->i_ea_refs++; ffs_unlock_ea(vp); @@ -1426,6 +1432,7 @@ ffs_close_ea(struct vnode *vp, int commit, struct ucred *cred, struct thread *td struct ufs2_dinode *dp; size_t ea_len, tlen; int error, i, lcnt; + bool truncate; ip = VTOI(vp); @@ -1436,6 +1443,7 @@ ffs_close_ea(struct vnode *vp, int commit, struct ucred *cred, struct thread *td } dp = ip->i_din2; error = ip->i_ea_error; + truncate = false; if (commit && error == 0) { ASSERT_VOP_ELOCKED(vp, "ffs_close_ea commit"); if (cred == NOCRED) @@ -1452,12 +1460,12 @@ ffs_close_ea(struct vnode *vp, int commit, struct ucred *cred, struct thread *td liovec[0].iov_base = ip->i_ea_area; liovec[0].iov_len = ip->i_ea_len; - for (i = 1, tlen = ea_len; i < lcnt; i++) { + for (i = 1, tlen = ea_len - ip->i_ea_len; i < lcnt; i++) { liovec[i].iov_base = __DECONST(void *, zero_region); liovec[i].iov_len = MIN(ZERO_REGION_SIZE, tlen); tlen -= liovec[i].iov_len; } - MPASS(tlen == ip->i_ea_len); + MPASS(tlen == 0); luio.uio_iov = liovec; luio.uio_offset = 0; @@ -1466,6 +1474,8 @@ ffs_close_ea(struct vnode *vp, int commit, struct ucred *cred, struct thread *td luio.uio_rw = UIO_WRITE; luio.uio_td = td; error = ffs_extwrite(vp, &luio, IO_EXT | IO_SYNC, cred); + if (error == 0 && ip->i_ea_len == 0) + truncate = true; } if (--ip->i_ea_refs == 0) { free(ip->i_ea_area, M_TEMP); @@ -1475,7 +1485,7 @@ ffs_close_ea(struct vnode *vp, int commit, struct ucred *cred, struct thread *td } ffs_unlock_ea(vp); - if (commit && error == 0 && ip->i_ea_len == 0) + if (truncate) ffs_truncate(vp, 0, IO_EXT, cred); return (error); } _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/dev-commits-src-all To unsubscribe, send any mail to "[email protected]"
