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Subject[AppArmor 09/47] Add a struct vfsmount parameter to vfs_symlink()
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/ecryptfs/inode.c | 4 +++-
fs/namei.c | 6 ++++--
fs/nfsd/vfs.c | 13 +++++++++----
fs/unionfs/copyup.c | 1 +
fs/unionfs/inode.c | 4 +++-
fs/unionfs/sioq.c | 3 ++-
fs/unionfs/sioq.h | 1 +
include/linux/fs.h | 2 +-
8 files changed, 24 insertions(+), 10 deletions(-)
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -460,6 +460,7 @@ static int ecryptfs_symlink(struct inode
{
int rc;
struct dentry *lower_dentry;
+ struct vfsmount *lower_mnt;
struct dentry *lower_dir_dentry;
umode_t mode;
char *encoded_symname;
@@ -468,6 +469,7 @@ static int ecryptfs_symlink(struct inode

lower_dentry = ecryptfs_dentry_to_lower(dentry);
dget(lower_dentry);
+ lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
lower_dir_dentry = lock_parent(lower_dentry);
mode = S_IALLUGO;
encoded_symlen = ecryptfs_encode_filename(crypt_stat, symname,
@@ -477,7 +479,7 @@ static int ecryptfs_symlink(struct inode
rc = encoded_symlen;
goto out_lock;
}
- rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
+ rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, lower_mnt,
encoded_symname, mode);
kfree(encoded_symname);
if (rc || !lower_dentry->d_inode)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2391,7 +2391,8 @@ asmlinkage long sys_unlink(const char __
return do_unlinkat(AT_FDCWD, pathname);
}

-int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname, int mode)
+int vfs_symlink(struct inode *dir, struct dentry *dentry, struct vfsmount *mnt,
+ const char *oldname, int mode)
{
int error = may_create(dir, dentry, NULL);

@@ -2440,7 +2441,8 @@ asmlinkage long sys_symlinkat(const char
error = mnt_want_write(nd.path.mnt);
if (error)
goto out_dput;
- error = vfs_symlink(nd.path.dentry->d_inode, dentry, from, S_IALLUGO);
+ error = vfs_symlink(nd.path.dentry->d_inode, dentry, nd.path.mnt, from,
+ S_IALLUGO);
mnt_drop_write(nd.path.mnt);
out_dput:
dput(dentry);
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1495,6 +1495,7 @@ nfsd_symlink(struct svc_rqst *rqstp, str
struct iattr *iap)
{
struct dentry *dentry, *dnew;
+ struct svc_export *exp;
__be32 err, cerr;
int host_err;
umode_t mode;
@@ -1521,6 +1522,7 @@ nfsd_symlink(struct svc_rqst *rqstp, str
if (iap && (iap->ia_valid & ATTR_MODE))
mode = iap->ia_mode & S_IALLUGO;

+ exp = fhp->fh_export;
if (unlikely(path[plen] != 0)) {
char *path_alloced = kmalloc(plen+1, GFP_KERNEL);
if (path_alloced == NULL)
@@ -1528,20 +1530,23 @@ nfsd_symlink(struct svc_rqst *rqstp, str
else {
strncpy(path_alloced, path, plen);
path_alloced[plen] = 0;
- host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode);
+ host_err = vfs_symlink(dentry->d_inode, dnew,
+ exp->ex_path.mnt, path_alloced,
+ mode);
kfree(path_alloced);
}
} else
- host_err = vfs_symlink(dentry->d_inode, dnew, path, mode);
+ host_err = vfs_symlink(dentry->d_inode, dnew, exp->ex_path.mnt,
+ path, mode);

if (!host_err) {
- if (EX_ISSYNC(fhp->fh_export))
+ if (EX_ISSYNC(exp))
host_err = nfsd_sync_dir(dentry);
}
err = nfserrno(host_err);
fh_unlock(fhp);

- cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp);
+ cerr = fh_compose(resfhp, exp, dnew, fhp);
dput(dnew);
if (err==0) err = cerr;
out:
--- a/fs/unionfs/copyup.c
+++ b/fs/unionfs/copyup.c
@@ -184,6 +184,7 @@ static int __copyup_ndentry(struct dentr
} else if (S_ISLNK(old_mode)) {
args.symlink.parent = new_lower_parent_dentry->d_inode;
args.symlink.dentry = new_lower_dentry;
+ args.symlink.mnt = new_lower_mnt;
args.symlink.symbuf = symbuf;
args.symlink.mode = old_mode;

--- a/fs/unionfs/inode.c
+++ b/fs/unionfs/inode.c
@@ -452,6 +452,7 @@ static int unionfs_symlink(struct inode
*/
for (bindex = bstart; bindex >= 0; bindex--) {
lower_dentry = unionfs_lower_dentry_idx(dentry, bindex);
+ lower_mnt = unionfs_lower_mnt_idx(dentry, bindex);
if (!lower_dentry) {
/*
* if lower_dentry is NULL, create the entire
@@ -482,7 +483,8 @@ static int unionfs_symlink(struct inode
if (!err) {
mode = S_IALLUGO;
err = vfs_symlink(lower_dir_dentry->d_inode,
- lower_dentry, symname, mode);
+ lower_dentry, lower_mnt, symname,
+ mode);
}
unlock_dir(lower_dir_dentry);

--- a/fs/unionfs/sioq.c
+++ b/fs/unionfs/sioq.c
@@ -87,7 +87,8 @@ void __unionfs_symlink(struct work_struc
struct sioq_args *args = container_of(work, struct sioq_args, work);
struct symlink_args *s = &args->symlink;

- args->err = vfs_symlink(s->parent, s->dentry, s->symbuf, s->mode);
+ args->err = vfs_symlink(s->parent, s->dentry, s->mnt, s->symbuf,
+ s->mode);
complete(&args->comp);
}

--- a/fs/unionfs/sioq.h
+++ b/fs/unionfs/sioq.h
@@ -50,6 +50,7 @@ struct mknod_args {
struct symlink_args {
struct inode *parent;
struct dentry *dentry;
+ struct vfsmount *mnt;
char *symbuf;
umode_t mode;
};
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1072,7 +1072,7 @@ extern int vfs_permission(struct nameida
extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
extern int vfs_mkdir(struct inode *, struct dentry *, struct vfsmount *, int);
extern int vfs_mknod(struct inode *, struct dentry *, struct vfsmount *, int, dev_t);
-extern int vfs_symlink(struct inode *, struct dentry *, const char *, int);
+extern int vfs_symlink(struct inode *, struct dentry *, struct vfsmount *, const char *, int);
extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
extern int vfs_rmdir(struct inode *, struct dentry *);
extern int vfs_unlink(struct inode *, struct dentry *);
--



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