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Implement ffs_listextattr() by breaking out that logic and special-cased

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attribute name of "" from ffs_getextattr().  Invoking VOP_GETETATTR()
with an empty name is now no longer supported; user application
compatibility is provided by a system call level compatibility
wrapper.  We make sure to explicitly reject attempts to set an EA
with the name "".

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, Network Associates Laboratories
This commit is contained in:
Robert Watson 2003-06-05 05:57:39 +00:00
parent 777621799b
commit 1e9e2eb598
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=115869
1 changed files with 88 additions and 32 deletions
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120
sys/ufs/ffs/ffs_vnops.c
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@ -90,6 +90,7 @@ static int ffs_extwrite(struct vnode *vp, struct uio *uio, int ioflag,
static int ffsext_strategy(struct vop_strategy_args *);
static int ffs_closeextattr(struct vop_closeextattr_args *);
static int ffs_getextattr(struct vop_getextattr_args *);
static int ffs_listextattr(struct vop_listextattr_args *);
static int ffs_openextattr(struct vop_openextattr_args *);
static int ffs_setextattr(struct vop_setextattr_args *);
@ -105,6 +106,7 @@ static struct vnodeopv_entry_desc ffs_vnodeop_entries[] = {
{ &vop_write_desc, (vop_t *) ffs_write },
{ &vop_closeextattr_desc, (vop_t *) ffs_closeextattr },
{ &vop_getextattr_desc, (vop_t *) ffs_getextattr },
{ &vop_listextattr_desc, (vop_t *) ffs_listextattr },
{ &vop_openextattr_desc, (vop_t *) ffs_openextattr },
{ &vop_setextattr_desc, (vop_t *) ffs_setextattr },
{ NULL, NULL }
@ -120,6 +122,7 @@ static struct vnodeopv_entry_desc ffs_specop_entries[] = {
{ &vop_strategy_desc, (vop_t *) ffsext_strategy },
{ &vop_closeextattr_desc, (vop_t *) ffs_closeextattr },
{ &vop_getextattr_desc, (vop_t *) ffs_getextattr },
{ &vop_listextattr_desc, (vop_t *) ffs_listextattr },
{ &vop_openextattr_desc, (vop_t *) ffs_openextattr },
{ &vop_setextattr_desc, (vop_t *) ffs_setextattr },
{ NULL, NULL }
@ -135,6 +138,7 @@ static struct vnodeopv_entry_desc ffs_fifoop_entries[] = {
{ &vop_strategy_desc, (vop_t *) ffsext_strategy },
{ &vop_closeextattr_desc, (vop_t *) ffs_closeextattr },
{ &vop_getextattr_desc, (vop_t *) ffs_getextattr },
{ &vop_listextattr_desc, (vop_t *) ffs_listextattr },
{ &vop_openextattr_desc, (vop_t *) ffs_openextattr },
{ &vop_setextattr_desc, (vop_t *) ffs_setextattr },
{ NULL, NULL }
@ -1464,6 +1468,68 @@ vop_getextattr {
IN struct thread *a_td;
};
*/
{
struct inode *ip;
struct fs *fs;
u_char *eae, *p;
unsigned easize;
int error, ealen, stand_alone;
ip = VTOI(ap->a_vp);
fs = ip->i_fs;
if (fs->fs_magic == FS_UFS1_MAGIC)
return (ufs_vnoperate((struct vop_generic_args *)ap));
if (ap->a_vp->v_type == VCHR)
return (EOPNOTSUPP);
error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
ap->a_cred, ap->a_td, IREAD);
if (error)
return (error);
if (ip->i_ea_area == NULL) {
error = ffs_open_ea(ap->a_vp, ap->a_cred, ap->a_td);
if (error)
return (error);
stand_alone = 1;
} else {
stand_alone = 0;
}
eae = ip->i_ea_area;
easize = ip->i_ea_len;
ealen = ffs_findextattr(eae, easize, ap->a_attrnamespace, ap->a_name,
NULL, &p);
if (ealen >= 0) {
error = 0;
if (ap->a_size != NULL)
*ap->a_size = ealen;
else if (ap->a_uio != NULL)
error = uiomove(p, ealen, ap->a_uio);
} else
error = ENOATTR;
if (stand_alone)
ffs_close_ea(ap->a_vp, 0, ap->a_cred, ap->a_td);
return(error);
}
/*
* Vnode operation to retrieve extended attributes on a vnode.
*/
static int
ffs_listextattr(struct vop_listextattr_args *ap)
/*
vop_listextattr {
IN struct vnode *a_vp;
IN int a_attrnamespace;
INOUT struct uio *a_uio;
OUT size_t *a_size;
IN struct ucred *a_cred;
IN struct thread *a_td;
};
*/
{
struct inode *ip;
struct fs *fs;
@ -1496,38 +1562,25 @@ vop_getextattr {
}
eae = ip->i_ea_area;
easize = ip->i_ea_len;
if (strlen(ap->a_name) > 0) {
ealen = ffs_findextattr(eae, easize,
ap->a_attrnamespace, ap->a_name, NULL, &p);
if (ealen >= 0) {
error = 0;
if (ap->a_size != NULL)
*ap->a_size = ealen;
else if (ap->a_uio != NULL)
error = uiomove(p, ealen, ap->a_uio);
} else {
error = ENOATTR;
}
} else {
error = 0;
if (ap->a_size != NULL)
*ap->a_size = 0;
pe = eae + easize;
for(p = eae; error == 0 && p < pe; p = pn) {
bcopy(p, &ul, sizeof(ul));
pn = p + ul;
if (pn > pe)
break;
p += sizeof(ul);
if (*p++ != ap->a_attrnamespace)
continue;
p++; /* pad2 */
ealen = *p;
if (ap->a_size != NULL) {
*ap->a_size += ealen + 1;
} else if (ap->a_uio != NULL) {
error = uiomove(p, ealen + 1, ap->a_uio);
}
error = 0;
if (ap->a_size != NULL)
*ap->a_size = 0;
pe = eae + easize;
for(p = eae; error == 0 && p < pe; p = pn) {
bcopy(p, &ul, sizeof(ul));
pn = p + ul;
if (pn > pe)
break;
p += sizeof(ul);
if (*p++ != ap->a_attrnamespace)
continue;
p++; /* pad2 */
ealen = *p;
if (ap->a_size != NULL) {
*ap->a_size += ealen + 1;
} else if (ap->a_uio != NULL) {
error = uiomove(p, ealen + 1, ap->a_uio);
}
}
if (stand_alone)
@ -1567,6 +1620,9 @@ vop_setextattr {
if (ap->a_vp->v_type == VCHR)
return (EOPNOTSUPP);
if (strlen(ap->a_name) == 0)
return (EINVAL);
error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
ap->a_cred, ap->a_td, IWRITE);
if (error) {