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Subject[AppArmor 25/41] Add a struct vfsmount parameter to vfs_getxattr()
The vfsmount will be passed down to the LSM hook so that LSMs can compute
pathnames.

Signed-off-by: Tony Jones <tonyj@suse.de>
Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: John Johansen <jjohansen@suse.de>

---
fs/nfsd/nfs4xdr.c | 2 +-
fs/nfsd/vfs.c | 21 ++++++++++++---------
fs/xattr.c | 14 ++++++++------
include/linux/nfsd/nfsd.h | 3 ++-
include/linux/xattr.h | 3 ++-
5 files changed, 25 insertions(+), 18 deletions(-)
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1470,7 +1470,7 @@ nfsd4_encode_fattr(struct svc_fh *fhp, s
}
if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
| FATTR4_WORD0_SUPPORTED_ATTRS)) {
- err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
+ err = nfsd4_get_nfs4_acl(rqstp, dentry, exp->ex_mnt, &acl);
aclsupport = (err == 0);
if (bmval0 & FATTR4_WORD0_ACL) {
if (err == -EOPNOTSUPP)
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -378,11 +378,12 @@ out_nfserr:
#if defined(CONFIG_NFSD_V2_ACL) || \
defined(CONFIG_NFSD_V3_ACL) || \
defined(CONFIG_NFSD_V4)
-static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf)
+static ssize_t nfsd_getxattr(struct dentry *dentry, struct vfsmount *mnt,
+ char *key, void **buf)
{
ssize_t buflen;

- buflen = vfs_getxattr(dentry, key, NULL, 0);
+ buflen = vfs_getxattr(dentry, mnt, key, NULL, 0);
if (buflen <= 0)
return buflen;

@@ -390,7 +391,7 @@ static ssize_t nfsd_getxattr(struct dent
if (!*buf)
return -ENOMEM;

- return vfs_getxattr(dentry, key, *buf, buflen);
+ return vfs_getxattr(dentry, mnt, key, *buf, buflen);
}
#endif

@@ -479,13 +480,13 @@ out_nfserr:
}

static struct posix_acl *
-_get_posix_acl(struct dentry *dentry, char *key)
+_get_posix_acl(struct dentry *dentry, struct vfsmount *mnt, char *key)
{
void *buf = NULL;
struct posix_acl *pacl = NULL;
int buflen;

- buflen = nfsd_getxattr(dentry, key, &buf);
+ buflen = nfsd_getxattr(dentry, mnt, key, &buf);
if (!buflen)
buflen = -ENODATA;
if (buflen <= 0)
@@ -497,14 +498,15 @@ _get_posix_acl(struct dentry *dentry, ch
}

int
-nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl)
+nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry,
+ struct vfsmount *mnt, struct nfs4_acl **acl)
{
struct inode *inode = dentry->d_inode;
int error = 0;
struct posix_acl *pacl = NULL, *dpacl = NULL;
unsigned int flags = 0;

- pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS);
+ pacl = _get_posix_acl(dentry, mnt, POSIX_ACL_XATTR_ACCESS);
if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA)
pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
if (IS_ERR(pacl)) {
@@ -514,7 +516,7 @@ nfsd4_get_nfs4_acl(struct svc_rqst *rqst
}

if (S_ISDIR(inode->i_mode)) {
- dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT);
+ dpacl = _get_posix_acl(dentry, mnt, POSIX_ACL_XATTR_DEFAULT);
if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA)
dpacl = NULL;
else if (IS_ERR(dpacl)) {
@@ -1938,7 +1940,8 @@ nfsd_get_posix_acl(struct svc_fh *fhp, i
return ERR_PTR(-EOPNOTSUPP);
}

- size = nfsd_getxattr(fhp->fh_dentry, name, &value);
+ size = nfsd_getxattr(fhp->fh_dentry, fhp->fh_export->ex_mnt, name,
+ &value);
if (size < 0)
return ERR_PTR(size);

--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -107,7 +107,8 @@ out:
EXPORT_SYMBOL_GPL(vfs_setxattr);

ssize_t
-vfs_getxattr(struct dentry *dentry, char *name, void *value, size_t size)
+vfs_getxattr(struct dentry *dentry, struct vfsmount *mnt, char *name,
+ void *value, size_t size)
{
struct inode *inode = dentry->d_inode;
int error;
@@ -279,7 +280,8 @@ sys_fsetxattr(int fd, char __user *name,
* Extended attribute GET operations
*/
static ssize_t
-getxattr(struct dentry *d, char __user *name, void __user *value, size_t size)
+getxattr(struct dentry *dentry, struct vfsmount *mnt, char __user *name,
+ void __user *value, size_t size)
{
ssize_t error;
void *kvalue = NULL;
@@ -299,7 +301,7 @@ getxattr(struct dentry *d, char __user *
return -ENOMEM;
}

- error = vfs_getxattr(d, kname, kvalue, size);
+ error = vfs_getxattr(dentry, mnt, kname, kvalue, size);
if (error > 0) {
if (size && copy_to_user(value, kvalue, error))
error = -EFAULT;
@@ -322,7 +324,7 @@ sys_getxattr(char __user *path, char __u
error = user_path_walk(path, &nd);
if (error)
return error;
- error = getxattr(nd.dentry, name, value, size);
+ error = getxattr(nd.dentry, nd.mnt, name, value, size);
path_release(&nd);
return error;
}
@@ -337,7 +339,7 @@ sys_lgetxattr(char __user *path, char __
error = user_path_walk_link(path, &nd);
if (error)
return error;
- error = getxattr(nd.dentry, name, value, size);
+ error = getxattr(nd.dentry, nd.mnt, name, value, size);
path_release(&nd);
return error;
}
@@ -351,7 +353,7 @@ sys_fgetxattr(int fd, char __user *name,
f = fget(fd);
if (!f)
return error;
- error = getxattr(f->f_path.dentry, name, value, size);
+ error = getxattr(f->f_path.dentry, f->f_path.mnt, name, value, size);
fput(f);
return error;
}
--- a/include/linux/nfsd/nfsd.h
+++ b/include/linux/nfsd/nfsd.h
@@ -77,7 +77,8 @@ __be32 nfsd_setattr(struct svc_rqst *,
#ifdef CONFIG_NFSD_V4
__be32 nfsd4_set_nfs4_acl(struct svc_rqst *, struct svc_fh *,
struct nfs4_acl *);
-int nfsd4_get_nfs4_acl(struct svc_rqst *, struct dentry *, struct nfs4_acl **);
+int nfsd4_get_nfs4_acl(struct svc_rqst *, struct dentry *,
+ struct vfsmount *mnt, struct nfs4_acl **);
#endif /* CONFIG_NFSD_V4 */
__be32 nfsd_create(struct svc_rqst *, struct svc_fh *,
char *name, int len, struct iattr *attrs,
--- a/include/linux/xattr.h
+++ b/include/linux/xattr.h
@@ -46,7 +46,8 @@ struct xattr_handler {
size_t size, int flags);
};

-ssize_t vfs_getxattr(struct dentry *, char *, void *, size_t);
+ssize_t vfs_getxattr(struct dentry *, struct vfsmount *, char *, void *,
+ size_t);
ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
int vfs_setxattr(struct dentry *, struct vfsmount *, char *, void *, size_t,
int);
--
-
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