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zfs: light refactor to indicate cachedlookup in zfs_lookup

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If we come from VOP_CACHEDLOOKUP, we must skip the VEXEC check as it will
have been done in the caller (vfs_cache_lookup). This is a part of D23247,
which may skip the earlier VEXEC check as well if the root fd was opened
with O_SEARCH.

This one required slightly more work as zfs_lookup may also be called
indirectly as VOP_LOOKUP or a couple of other places where we must do the
check.
This commit is contained in:
kevans 2020-02-02 16:10:33 +00:00
parent 4c0e920398
commit 1f9321e091
1 changed files with 22 additions and 17 deletions
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39
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c
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@ -1470,7 +1470,7 @@ zfs_lookup_lock(vnode_t *dvp, vnode_t *vp, const char *name, int lkflags)
/* ARGSUSED */
static int
zfs_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, struct componentname *cnp,
int nameiop, cred_t *cr, kthread_t *td, int flags)
int nameiop, cred_t *cr, kthread_t *td, int flags, boolean_t cached)
{
znode_t *zdp = VTOZ(dvp);
znode_t *zp;
@ -1542,9 +1542,12 @@ zfs_lookup(vnode_t *dvp, char *nm, vnode_t **vpp, struct componentname *cnp,
/*
* Check accessibility of directory.
*/
if (error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr)) {
ZFS_EXIT(zfsvfs);
return (error);
if (!cached) {
error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr);
if (error != 0) {
ZFS_EXIT(zfsvfs);
return (error);
}
}
if (zfsvfs->z_utf8 && u8_validate(nm, strlen(nm),
@ -4894,12 +4897,7 @@ zfs_freebsd_access(ap)
}
static int
zfs_freebsd_lookup(ap)
struct vop_lookup_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
} */ *ap;
zfs_freebsd_lookup(struct vop_lookup_args *ap, boolean_t cached)
{
struct componentname *cnp = ap->a_cnp;
char nm[NAME_MAX + 1];
@ -4908,7 +4906,14 @@ zfs_freebsd_lookup(ap)
strlcpy(nm, cnp->cn_nameptr, MIN(cnp->cn_namelen + 1, sizeof(nm)));
return (zfs_lookup(ap->a_dvp, nm, ap->a_vpp, cnp, cnp->cn_nameiop,
cnp->cn_cred, cnp->cn_thread, 0));
cnp->cn_cred, cnp->cn_thread, 0, cached));
}
static int
zfs_freebsd_cachedlookup(struct vop_cachedlookup_args *ap)
{
return (zfs_freebsd_lookup((struct vop_lookup_args *)ap, B_TRUE));
}
static int
@ -4925,7 +4930,7 @@ zfs_cache_lookup(ap)
if (zfsvfs->z_use_namecache)
return (vfs_cache_lookup(ap));
else
return (zfs_freebsd_lookup(ap));
return (zfs_freebsd_lookup(ap, B_FALSE));
}
static int
@ -5507,7 +5512,7 @@ vop_getextattr {
ZFS_ENTER(zfsvfs);
error = zfs_lookup(ap->a_vp, NULL, &xvp, NULL, 0, ap->a_cred, td,
LOOKUP_XATTR);
LOOKUP_XATTR, B_FALSE);
if (error != 0) {
ZFS_EXIT(zfsvfs);
return (error);
@ -5576,7 +5581,7 @@ vop_deleteextattr {
ZFS_ENTER(zfsvfs);
error = zfs_lookup(ap->a_vp, NULL, &xvp, NULL, 0, ap->a_cred, td,
LOOKUP_XATTR);
LOOKUP_XATTR, B_FALSE);
if (error != 0) {
ZFS_EXIT(zfsvfs);
return (error);
@ -5644,7 +5649,7 @@ vop_setextattr {
ZFS_ENTER(zfsvfs);
error = zfs_lookup(ap->a_vp, NULL, &xvp, NULL, 0, ap->a_cred, td,
LOOKUP_XATTR | CREATE_XATTR_DIR);
LOOKUP_XATTR | CREATE_XATTR_DIR, B_FALSE);
if (error != 0) {
ZFS_EXIT(zfsvfs);
return (error);
@ -5721,7 +5726,7 @@ vop_listextattr {
*sizep = 0;
error = zfs_lookup(ap->a_vp, NULL, &xvp, NULL, 0, ap->a_cred, td,
LOOKUP_XATTR);
LOOKUP_XATTR, B_FALSE);
if (error != 0) {
ZFS_EXIT(zfsvfs);
/*
@ -5982,7 +5987,7 @@ struct vop_vector zfs_vnodeops = {
.vop_access = zfs_freebsd_access,
.vop_allocate = VOP_EINVAL,
.vop_lookup = zfs_cache_lookup,
.vop_cachedlookup = zfs_freebsd_lookup,
.vop_cachedlookup = zfs_freebsd_cachedlookup,
.vop_getattr = zfs_freebsd_getattr,
.vop_setattr = zfs_freebsd_setattr,
.vop_create = zfs_freebsd_create,