@@ -244,7 +244,8 @@ int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **de
return -EPERM;
if (!inode_owner_or_capable(inode)) {
- error = inode_permission(inode, MAY_WRITE);
+ error = inode_permission(&init_user_ns, inode,
+ MAY_WRITE);
if (error)
return error;
}
@@ -9889,7 +9889,7 @@ static int btrfs_permission(struct inode *inode, int mask)
if (BTRFS_I(inode)->flags & BTRFS_INODE_READONLY)
return -EACCES;
}
- return generic_permission(inode, mask);
+ return generic_permission(&init_user_ns, inode, mask);
}
static int btrfs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
@@ -922,7 +922,7 @@ static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
BUG_ON(d_inode(victim->d_parent) != dir);
audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
- error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
+ error = inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
if (error)
return error;
if (IS_APPEND(dir))
@@ -951,7 +951,7 @@ static inline int btrfs_may_create(struct inode *dir, struct dentry *child)
return -EEXIST;
if (IS_DEADDIR(dir))
return -ENOENT;
- return inode_permission(dir, MAY_WRITE | MAY_EXEC);
+ return inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
}
/*
@@ -2538,7 +2538,8 @@ static int btrfs_search_path_in_tree_user(struct inode *inode,
ret = PTR_ERR(temp_inode);
goto out_put;
}
- ret = inode_permission(temp_inode, MAY_READ | MAY_EXEC);
+ ret = inode_permission(&init_user_ns, temp_inode,
+ MAY_READ | MAY_EXEC);
iput(temp_inode);
if (ret) {
ret = -EACCES;
@@ -3068,7 +3069,8 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
if (root == dest)
goto out_dput;
- err = inode_permission(inode, MAY_WRITE | MAY_EXEC);
+ err = inode_permission(&init_user_ns, inode,
+ MAY_WRITE | MAY_EXEC);
if (err)
goto out_dput;
}
@@ -3139,7 +3141,7 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
* running and allows defrag on files open in read-only mode.
*/
if (!capable(CAP_SYS_ADMIN) &&
- inode_permission(inode, MAY_WRITE)) {
+ inode_permission(&init_user_ns, inode, MAY_WRITE)) {
ret = -EPERM;
goto out;
}
@@ -2331,7 +2331,7 @@ int ceph_permission(struct inode *inode, int mask)
err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
if (!err)
- err = generic_permission(inode, mask);
+ err = generic_permission(&init_user_ns, inode, mask);
return err;
}
@@ -320,7 +320,7 @@ static int cifs_permission(struct inode *inode, int mask)
on the client (above and beyond ACL on servers) for
servers which do not support setting and viewing mode bits,
so allowing client to check permissions is useful */
- return generic_permission(inode, mask);
+ return generic_permission(&init_user_ns, inode, mask);
}
static struct kmem_cache *cifs_inode_cachep;
@@ -197,7 +197,8 @@ int configfs_symlink(struct inode *dir, struct dentry *dentry, const char *symna
if (dentry->d_inode || d_unhashed(dentry))
ret = -EEXIST;
else
- ret = inode_permission(dir, MAY_WRITE | MAY_EXEC);
+ ret = inode_permission(&init_user_ns, dir,
+ MAY_WRITE | MAY_EXEC);
if (!ret)
ret = type->ct_item_ops->allow_link(parent_item, target_item);
if (!ret) {
@@ -864,7 +864,8 @@ int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
static int
ecryptfs_permission(struct inode *inode, int mask)
{
- return inode_permission(ecryptfs_inode_to_lower(inode), mask);
+ return inode_permission(&init_user_ns,
+ ecryptfs_inode_to_lower(inode), mask);
}
/**
@@ -1404,7 +1404,7 @@ EXPORT_SYMBOL(begin_new_exec);
void would_dump(struct linux_binprm *bprm, struct file *file)
{
struct inode *inode = file_inode(file);
- if (inode_permission(inode, MAY_READ) < 0) {
+ if (inode_permission(&init_user_ns, inode, MAY_READ) < 0) {
struct user_namespace *old, *user_ns;
bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP;
@@ -1280,7 +1280,7 @@ static int fuse_permission(struct inode *inode, int mask)
}
if (fc->default_permissions) {
- err = generic_permission(inode, mask);
+ err = generic_permission(&init_user_ns, inode, mask);
/* If permission is denied, try to refresh file
attributes. This is also needed, because the root
@@ -1288,7 +1288,8 @@ static int fuse_permission(struct inode *inode, int mask)
if (err == -EACCES && !refreshed) {
err = fuse_perm_getattr(inode, mask);
if (!err)
- err = generic_permission(inode, mask);
+ err = generic_permission(&init_user_ns,
+ inode, mask);
}
/* Note: the opposite of the above test does not
@@ -1852,7 +1852,7 @@ int gfs2_permission(struct inode *inode, int mask)
if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
error = -EPERM;
else
- error = generic_permission(inode, mask);
+ error = generic_permission(&init_user_ns, inode, mask);
if (gfs2_holder_initialized(&i_gh))
gfs2_glock_dq_uninit(&i_gh);
@@ -779,7 +779,7 @@ static int hostfs_permission(struct inode *ino, int desired)
err = access_file(name, r, w, x);
__putname(name);
if (!err)
- err = generic_permission(ino, desired);
+ err = generic_permission(&init_user_ns, ino, desired);
return err;
}
@@ -285,7 +285,7 @@ int kernfs_iop_permission(struct inode *inode, int mask)
kernfs_refresh_inode(kn, inode);
mutex_unlock(&kernfs_mutex);
- return generic_permission(inode, mask);
+ return generic_permission(&init_user_ns, inode, mask);
}
int kernfs_xattr_get(struct kernfs_node *kn, const char *name,
@@ -1318,9 +1318,14 @@ static ssize_t empty_dir_listxattr(struct dentry *dentry, char *list, size_t siz
return -EOPNOTSUPP;
}
+static int empty_dir_permission(struct inode *inode, int mask)
+{
+ return generic_permission(&init_user_ns, inode, mask);
+}
+
static const struct inode_operations empty_dir_inode_operations = {
.lookup = empty_dir_lookup,
- .permission = generic_permission,
+ .permission = empty_dir_permission,
.setattr = empty_dir_setattr,
.getattr = empty_dir_getattr,
.listxattr = empty_dir_listxattr,
@@ -259,7 +259,24 @@ void putname(struct filename *name)
__putname(name);
}
-static int check_acl(struct inode *inode, int mask)
+/**
+ * check_acl - perform ACL permission checking
+ * @mnt_userns: user namespace of the mount the inode was found from
+ * @inode: inode to check permissions on
+ * @mask: right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC ...)
+ *
+ * This function performs the ACL permission checking. Since this function
+ * retrieve POSIX acls it needs to know whether it is called from a blocking or
+ * non-blocking context and thus cares about the MAY_NOT_BLOCK bit.
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then take
+ * care to map the inode according to @mnt_userns before checking permissions.
+ * On non-idmapped mounts or if permission checking is to be performed on the
+ * raw inode simply passs init_user_ns.
+ */
+static int check_acl(struct user_namespace *mnt_userns,
+ struct inode *inode, int mask)
{
#ifdef CONFIG_FS_POSIX_ACL
struct posix_acl *acl;
@@ -271,14 +288,14 @@ static int check_acl(struct inode *inode, int mask)
/* no ->get_acl() calls in RCU mode... */
if (is_uncached_acl(acl))
return -ECHILD;
- return posix_acl_permission(inode, acl, mask);
+ return posix_acl_permission(mnt_userns, inode, acl, mask);
}
acl = get_acl(inode, ACL_TYPE_ACCESS);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (acl) {
- int error = posix_acl_permission(inode, acl, mask);
+ int error = posix_acl_permission(mnt_userns, inode, acl, mask);
posix_acl_release(acl);
return error;
}
@@ -287,18 +304,31 @@ static int check_acl(struct inode *inode, int mask)
return -EAGAIN;
}
-/*
- * This does the basic UNIX permission checking.
+/**
+ * acl_permission_check - perform basic UNIX permission checking
+ * @mnt_userns: user namespace of the mount the inode was found from
+ * @inode: inode to check permissions on
+ * @mask: right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC ...)
+ *
+ * This function performs the basic UNIX permission checking. Since this
+ * function may retrieve POSIX acls it needs to know whether it is called from a
+ * blocking or non-blocking context and thus cares about the MAY_NOT_BLOCK bit.
*
- * Note that the POSIX ACL check cares about the MAY_NOT_BLOCK bit,
- * for RCU walking.
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then take
+ * care to map the inode according to @mnt_userns before checking permissions.
+ * On non-idmapped mounts or if permission checking is to be performed on the
+ * raw inode simply passs init_user_ns.
*/
-static int acl_permission_check(struct inode *inode, int mask)
+static int acl_permission_check(struct user_namespace *mnt_userns,
+ struct inode *inode, int mask)
{
unsigned int mode = inode->i_mode;
+ kuid_t i_uid;
/* Are we the owner? If so, ACL's don't matter */
- if (likely(uid_eq(current_fsuid(), inode->i_uid))) {
+ i_uid = i_uid_into_mnt(mnt_userns, inode);
+ if (likely(uid_eq(current_fsuid(), i_uid))) {
mask &= 7;
mode >>= 6;
return (mask & ~mode) ? -EACCES : 0;
@@ -306,7 +336,7 @@ static int acl_permission_check(struct inode *inode, int mask)
/* Do we have ACL's? */
if (IS_POSIXACL(inode) && (mode & S_IRWXG)) {
- int error = check_acl(inode, mask);
+ int error = check_acl(mnt_userns, inode, mask);
if (error != -EAGAIN)
return error;
}
@@ -320,7 +350,8 @@ static int acl_permission_check(struct inode *inode, int mask)
* about? Need to check group ownership if so.
*/
if (mask & (mode ^ (mode >> 3))) {
- if (in_group_p(inode->i_gid))
+ kgid_t kgid = i_gid_into_mnt(mnt_userns, inode);
+ if (in_group_p(kgid))
mode >>= 3;
}
@@ -330,6 +361,7 @@ static int acl_permission_check(struct inode *inode, int mask)
/**
* generic_permission - check for access rights on a Posix-like filesystem
+ * @mnt_userns: user namespace of the mount the inode was found from
* @inode: inode to check access rights for
* @mask: right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC,
* %MAY_NOT_BLOCK ...)
@@ -342,25 +374,32 @@ static int acl_permission_check(struct inode *inode, int mask)
* generic_permission is rcu-walk aware. It returns -ECHILD in case an rcu-walk
* request cannot be satisfied (eg. requires blocking or too much complexity).
* It would then be called again in ref-walk mode.
+ *
+ * If the inode has been found through an idmapped mount the user namespace of
+ * the vfsmount must be passed through @mnt_userns. This function will then take
+ * care to map the inode according to @mnt_userns before checking permissions.
+ * On non-idmapped mounts or if permission checking is to be performed on the
+ * raw inode simply passs init_user_ns.
*/
-int generic_permission(struct inode *inode, int mask)
+int generic_permission(struct user_namespace *mnt_userns, struct inode *inode,
+ int mask)
{
int ret;
/*
* Do the basic permission checks.
*/
- ret = acl_permission_check(inode, mask);
+ ret = acl_permission_check(mnt_userns, inode, mask);
if (ret != -EACCES)
return ret;
if (S_ISDIR(inode->i_mode)) {
/* DACs are overridable for directories */
if (!(mask & MAY_WRITE))
- if (capable_wrt_inode_uidgid(&init_user_ns, inode,
+ if (capable_wrt_inode_uidgid(mnt_userns, inode,
CAP_DAC_READ_SEARCH))
return 0;
- if (capable_wrt_inode_uidgid(&init_user_ns, inode,
+ if (capable_wrt_inode_uidgid(mnt_userns, inode,
CAP_DAC_OVERRIDE))
return 0;
return -EACCES;
@@ -371,7 +410,7 @@ int generic_permission(struct inode *inode, int mask)
*/
mask &= MAY_READ | MAY_WRITE | MAY_EXEC;
if (mask == MAY_READ)
- if (capable_wrt_inode_uidgid(&init_user_ns, inode,
+ if (capable_wrt_inode_uidgid(mnt_userns, inode,
CAP_DAC_READ_SEARCH))
return 0;
/*
@@ -380,7 +419,7 @@ int generic_permission(struct inode *inode, int mask)
* at least one exec bit set.
*/
if (!(mask & MAY_EXEC) || (inode->i_mode & S_IXUGO))
- if (capable_wrt_inode_uidgid(&init_user_ns, inode,
+ if (capable_wrt_inode_uidgid(mnt_userns, inode,
CAP_DAC_OVERRIDE))
return 0;
@@ -388,13 +427,19 @@ int generic_permission(struct inode *inode, int mask)
}
EXPORT_SYMBOL(generic_permission);
-/*
+/**
+ * do_inode_permission - UNIX permission checking
+ * @mnt_userns: user namespace of the mount the inode was found from
+ * @inode: inode to check permissions on
+ * @mask: right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC ...)
+ *
* We _really_ want to just do "generic_permission()" without
* even looking at the inode->i_op values. So we keep a cache
* flag in inode->i_opflags, that says "this has not special
* permission function, use the fast case".
*/
-static inline int do_inode_permission(struct inode *inode, int mask)
+static inline int do_inode_permission(struct user_namespace *mnt_userns,
+ struct inode *inode, int mask)
{
if (unlikely(!(inode->i_opflags & IOP_FASTPERM))) {
if (likely(inode->i_op->permission))
@@ -405,7 +450,7 @@ static inline int do_inode_permission(struct inode *inode, int mask)
inode->i_opflags |= IOP_FASTPERM;
spin_unlock(&inode->i_lock);
}
- return generic_permission(inode, mask);
+ return generic_permission(mnt_userns, inode, mask);
}
/**
@@ -430,8 +475,9 @@ static int sb_permission(struct super_block *sb, struct inode *inode, int mask)
/**
* inode_permission - Check for access rights to a given inode
- * @inode: Inode to check permission on
- * @mask: Right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC)
+ * @mnt_userns: User namespace of the mount the inode was found from
+ * @inode: Inode to check permission on
+ * @mask: Right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC)
*
* Check for read/write/execute permissions on an inode. We use fs[ug]id for
* this, letting us set arbitrary permissions for filesystem access without
@@ -439,7 +485,8 @@ static int sb_permission(struct super_block *sb, struct inode *inode, int mask)
*
* When checking for MAY_APPEND, MAY_WRITE must also be set in @mask.
*/
-int inode_permission(struct inode *inode, int mask)
+int inode_permission(struct user_namespace *mnt_userns,
+ struct inode *inode, int mask)
{
int retval;
@@ -463,7 +510,7 @@ int inode_permission(struct inode *inode, int mask)
return -EACCES;
}
- retval = do_inode_permission(inode, mask);
+ retval = do_inode_permission(mnt_userns, inode, mask);
if (retval)
return retval;
@@ -1009,7 +1056,7 @@ static bool safe_hardlink_source(struct inode *inode)
return false;
/* Hardlinking to unreadable or unwritable sources is dangerous. */
- if (inode_permission(inode, MAY_READ | MAY_WRITE))
+ if (inode_permission(&init_user_ns, inode, MAY_READ | MAY_WRITE))
return false;
return true;
@@ -1569,13 +1616,14 @@ static struct dentry *lookup_slow(const struct qstr *name,
static inline int may_lookup(struct nameidata *nd)
{
if (nd->flags & LOOKUP_RCU) {
- int err = inode_permission(nd->inode, MAY_EXEC|MAY_NOT_BLOCK);
+ int err = inode_permission(&init_user_ns, nd->inode,
+ MAY_EXEC | MAY_NOT_BLOCK);
if (err != -ECHILD)
return err;
if (unlazy_walk(nd))
return -ECHILD;
}
- return inode_permission(nd->inode, MAY_EXEC);
+ return inode_permission(&init_user_ns, nd->inode, MAY_EXEC);
}
static int reserve_stack(struct nameidata *nd, struct path *link, unsigned seq)
@@ -2509,7 +2557,7 @@ static int lookup_one_len_common(const char *name, struct dentry *base,
return err;
}
- return inode_permission(base->d_inode, MAY_EXEC);
+ return inode_permission(&init_user_ns, base->d_inode, MAY_EXEC);
}
/**
@@ -2703,7 +2751,7 @@ static int may_delete(struct inode *dir, struct dentry *victim, bool isdir)
audit_inode_child(dir, victim, AUDIT_TYPE_CHILD_DELETE);
- error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
+ error = inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
if (error)
return error;
if (IS_APPEND(dir))
@@ -2747,7 +2795,7 @@ static inline int may_create(struct inode *dir, struct dentry *child)
if (!kuid_has_mapping(s_user_ns, current_fsuid()) ||
!kgid_has_mapping(s_user_ns, current_fsgid()))
return -EOVERFLOW;
- return inode_permission(dir, MAY_WRITE | MAY_EXEC);
+ return inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
}
/*
@@ -2877,7 +2925,7 @@ static int may_open(const struct path *path, int acc_mode, int flag)
break;
}
- error = inode_permission(inode, MAY_OPEN | acc_mode);
+ error = inode_permission(&init_user_ns, inode, MAY_OPEN | acc_mode);
if (error)
return error;
@@ -2939,7 +2987,8 @@ static int may_o_create(const struct path *dir, struct dentry *dentry, umode_t m
!kgid_has_mapping(s_user_ns, current_fsgid()))
return -EOVERFLOW;
- error = inode_permission(dir->dentry->d_inode, MAY_WRITE | MAY_EXEC);
+ error = inode_permission(&init_user_ns, dir->dentry->d_inode,
+ MAY_WRITE | MAY_EXEC);
if (error)
return error;
@@ -3276,7 +3325,7 @@ struct dentry *vfs_tmpfile(struct dentry *dentry, umode_t mode, int open_flag)
int error;
/* we want directory to be writable */
- error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
+ error = inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
if (error)
goto out_err;
error = -EOPNOTSUPP;
@@ -4267,12 +4316,14 @@ int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
*/
if (new_dir != old_dir) {
if (is_dir) {
- error = inode_permission(source, MAY_WRITE);
+ error = inode_permission(&init_user_ns, source,
+ MAY_WRITE);
if (error)
return error;
}
if ((flags & RENAME_EXCHANGE) && new_is_dir) {
- error = inode_permission(target, MAY_WRITE);
+ error = inode_permission(&init_user_ns, target,
+ MAY_WRITE);
if (error)
return error;
}
@@ -2987,7 +2987,7 @@ int nfs_permission(struct inode *inode, int mask)
res = nfs_revalidate_inode(NFS_SERVER(inode), inode);
if (res == 0)
- res = generic_permission(inode, mask);
+ res = generic_permission(&init_user_ns, inode, mask);
goto out;
}
EXPORT_SYMBOL_GPL(nfs_permission);
@@ -40,7 +40,8 @@ static int nfsd_acceptable(void *expv, struct dentry *dentry)
/* make sure parents give x permission to user */
int err;
parent = dget_parent(tdentry);
- err = inode_permission(d_inode(parent), MAY_EXEC);
+ err = inode_permission(&init_user_ns,
+ d_inode(parent), MAY_EXEC);
if (err < 0) {
dput(parent);
break;
@@ -2391,13 +2391,14 @@ nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp,
return 0;
/* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */
- err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC));
+ err = inode_permission(&init_user_ns, inode,
+ acc & (MAY_READ | MAY_WRITE | MAY_EXEC));
/* Allow read access to binaries even when mode 111 */
if (err == -EACCES && S_ISREG(inode->i_mode) &&
(acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) ||
acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC)))
- err = inode_permission(inode, MAY_EXEC);
+ err = inode_permission(&init_user_ns, inode, MAY_EXEC);
return err? nfserrno(err) : 0;
}
@@ -851,7 +851,7 @@ int nilfs_permission(struct inode *inode, int mask)
root->cno != NILFS_CPTREE_CURRENT_CNO)
return -EROFS; /* snapshot is not writable */
- return generic_permission(inode, mask);
+ return generic_permission(&init_user_ns, inode, mask);
}
int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
@@ -1355,7 +1355,7 @@ int ocfs2_permission(struct inode *inode, int mask)
dump_stack();
}
- ret = generic_permission(inode, mask);
+ ret = generic_permission(&init_user_ns, inode, mask);
ocfs2_inode_unlock_tracker(inode, 0, &oh, had_lock);
out:
@@ -4346,7 +4346,7 @@ static inline int ocfs2_may_create(struct inode *dir, struct dentry *child)
return -EEXIST;
if (IS_DEADDIR(dir))
return -ENOENT;
- return inode_permission(dir, MAY_WRITE | MAY_EXEC);
+ return inode_permission(&init_user_ns, dir, MAY_WRITE | MAY_EXEC);
}
/**
@@ -4400,7 +4400,7 @@ static int ocfs2_vfs_reflink(struct dentry *old_dentry, struct inode *dir,
* file.
*/
if (!preserve) {
- error = inode_permission(inode, MAY_READ);
+ error = inode_permission(&init_user_ns, inode, MAY_READ);
if (error)
return error;
}
@@ -83,7 +83,7 @@ long vfs_truncate(const struct path *path, loff_t length)
if (error)
goto out;
- error = inode_permission(inode, MAY_WRITE);
+ error = inode_permission(&init_user_ns, inode, MAY_WRITE);
if (error)
goto mnt_drop_write_and_out;
@@ -436,7 +436,7 @@ static long do_faccessat(int dfd, const char __user *filename, int mode, int fla
goto out_path_release;
}
- res = inode_permission(inode, mode | MAY_ACCESS);
+ res = inode_permission(&init_user_ns, inode, mode | MAY_ACCESS);
/* SuS v2 requires we report a read only fs too */
if (res || !(mode & S_IWOTH) || special_file(inode->i_mode))
goto out_path_release;
@@ -933,7 +933,7 @@ int orangefs_permission(struct inode *inode, int mask)
if (ret < 0)
return ret;
- return generic_permission(inode, mask);
+ return generic_permission(&init_user_ns, inode, mask);
}
int orangefs_update_time(struct inode *inode, struct timespec64 *time, int flags)
@@ -50,7 +50,7 @@ static struct file *ovl_open_realfile(const struct file *file,
acc_mode |= MAY_APPEND;
old_cred = ovl_override_creds(inode->i_sb);
- err = inode_permission(realinode, MAY_OPEN | acc_mode);
+ err = inode_permission(&init_user_ns, realinode, MAY_OPEN | acc_mode);
if (err) {
realfile = ERR_PTR(err);
} else {
@@ -294,7 +294,7 @@ int ovl_permission(struct inode *inode, int mask)
* Check overlay inode with the creds of task and underlying inode
* with creds of mounter
*/
- err = generic_permission(inode, mask);
+ err = generic_permission(&init_user_ns, inode, mask);
if (err)
return err;
@@ -305,7 +305,7 @@ int ovl_permission(struct inode *inode, int mask)
/* Make sure mounter can read file for copy up later */
mask |= MAY_READ;
}
- err = inode_permission(realinode, mask);
+ err = inode_permission(&init_user_ns, realinode, mask);
revert_creds(old_cred);
return err;
@@ -479,7 +479,7 @@ struct file *ovl_path_open(struct path *path, int flags)
BUG();
}
- err = inode_permission(inode, acc_mode | MAY_OPEN);
+ err = inode_permission(&init_user_ns, inode, acc_mode | MAY_OPEN);
if (err)
return ERR_PTR(err);
@@ -345,10 +345,13 @@ EXPORT_SYMBOL(posix_acl_from_mode);
* by the acl. Returns -E... otherwise.
*/
int
-posix_acl_permission(struct inode *inode, const struct posix_acl *acl, int want)
+posix_acl_permission(struct user_namespace *mnt_userns, struct inode *inode,
+ const struct posix_acl *acl, int want)
{
const struct posix_acl_entry *pa, *pe, *mask_obj;
int found = 0;
+ kuid_t uid;
+ kgid_t gid;
want &= MAY_READ | MAY_WRITE | MAY_EXEC;
@@ -356,22 +359,26 @@ posix_acl_permission(struct inode *inode, const struct posix_acl *acl, int want)
switch(pa->e_tag) {
case ACL_USER_OBJ:
/* (May have been checked already) */
- if (uid_eq(inode->i_uid, current_fsuid()))
+ uid = i_uid_into_mnt(mnt_userns, inode);
+ if (uid_eq(uid, current_fsuid()))
goto check_perm;
break;
case ACL_USER:
- if (uid_eq(pa->e_uid, current_fsuid()))
+ uid = kuid_into_mnt(mnt_userns, pa->e_uid);
+ if (uid_eq(uid, current_fsuid()))
goto mask;
break;
case ACL_GROUP_OBJ:
- if (in_group_p(inode->i_gid)) {
+ gid = i_gid_into_mnt(mnt_userns, inode);
+ if (in_group_p(gid)) {
found = 1;
if ((pa->e_perm & want) == want)
goto mask;
}
break;
case ACL_GROUP:
- if (in_group_p(pa->e_gid)) {
+ gid = kgid_into_mnt(mnt_userns, pa->e_gid);
+ if (in_group_p(gid)) {
found = 1;
if ((pa->e_perm & want) == want)
goto mask;
@@ -751,7 +751,7 @@ static int proc_pid_permission(struct inode *inode, int mask)
return -EPERM;
}
- return generic_permission(inode, mask);
+ return generic_permission(&init_user_ns, inode, mask);
}
@@ -3492,7 +3492,7 @@ static int proc_tid_comm_permission(struct inode *inode, int mask)
return 0;
}
- return generic_permission(inode, mask);
+ return generic_permission(&init_user_ns, inode, mask);
}
static const struct inode_operations proc_tid_comm_inode_operations = {
@@ -281,7 +281,7 @@ int proc_fd_permission(struct inode *inode, int mask)
struct task_struct *p;
int rv;
- rv = generic_permission(inode, mask);
+ rv = generic_permission(&init_user_ns, inode, mask);
if (rv == 0)
return rv;
@@ -957,7 +957,7 @@ int reiserfs_permission(struct inode *inode, int mask)
if (IS_PRIVATE(inode))
return 0;
- return generic_permission(inode, mask);
+ return generic_permission(&init_user_ns, inode, mask);
}
static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags)
@@ -438,7 +438,7 @@ static bool allow_file_dedupe(struct file *file)
return true;
if (uid_eq(current_fsuid(), file_inode(file)->i_uid))
return true;
- if (!inode_permission(file_inode(file), MAY_WRITE))
+ if (!inode_permission(&init_user_ns, file_inode(file), MAY_WRITE))
return true;
return false;
}
@@ -131,7 +131,7 @@ xattr_permission(struct inode *inode, const char *name, int mask)
return -EPERM;
}
- return inode_permission(inode, mask);
+ return inode_permission(&init_user_ns, inode, mask);
}
/*
@@ -2810,15 +2810,17 @@ static inline int bmap(struct inode *inode, sector_t *block)
#endif
extern int notify_change(struct dentry *, struct iattr *, struct inode **);
-extern int inode_permission(struct inode *, int);
-extern int generic_permission(struct inode *, int);
+int inode_permission(struct user_namespace *, struct inode *, int);
+int generic_permission(struct user_namespace *, struct inode *, int);
static inline int file_permission(struct file *file, int mask)
{
- return inode_permission(file_inode(file), mask);
+ return inode_permission(file_mnt_user_ns(file),
+ file_inode(file), mask);
}
static inline int path_permission(const struct path *path, int mask)
{
- return inode_permission(d_inode(path->dentry), mask);
+ return inode_permission(mnt_user_ns(path->mnt),
+ d_inode(path->dentry), mask);
}
extern int __check_sticky(struct inode *dir, struct inode *inode);
@@ -15,6 +15,8 @@
#include <linux/refcount.h>
#include <uapi/linux/posix_acl.h>
+struct user_namespace;
+
struct posix_acl_entry {
short e_tag;
unsigned short e_perm;
@@ -61,8 +63,6 @@ posix_acl_release(struct posix_acl *acl)
extern void posix_acl_init(struct posix_acl *, int);
extern struct posix_acl *posix_acl_alloc(int, gfp_t);
-extern int posix_acl_valid(struct user_namespace *, const struct posix_acl *);
-extern int posix_acl_permission(struct inode *, const struct posix_acl *, int);
extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t);
extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *);
extern int __posix_acl_create(struct posix_acl **, gfp_t, umode_t *);
@@ -85,6 +85,9 @@ struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type);
void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl);
void forget_cached_acl(struct inode *inode, int type);
void forget_all_cached_acls(struct inode *inode);
+int posix_acl_valid(struct user_namespace *, const struct posix_acl *);
+int posix_acl_permission(struct user_namespace *, struct inode *,
+ const struct posix_acl *, int);
static inline void cache_no_acl(struct inode *inode)
{
@@ -873,7 +873,7 @@ static int prepare_open(struct dentry *dentry, int oflag, int ro,
if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY))
return -EINVAL;
acc = oflag2acc[oflag & O_ACCMODE];
- return inode_permission(d_inode(dentry), acc);
+ return inode_permission(&init_user_ns, d_inode(dentry), acc);
}
static int do_mq_open(const char __user *u_name, int oflag, umode_t mode,
@@ -558,7 +558,7 @@ int bpf_obj_get_user(const char __user *pathname, int flags)
static struct bpf_prog *__get_prog_inode(struct inode *inode, enum bpf_prog_type type)
{
struct bpf_prog *prog;
- int ret = inode_permission(inode, MAY_READ);
+ int ret = inode_permission(&init_user_ns, inode, MAY_READ);
if (ret)
return ERR_PTR(ret);
@@ -4670,7 +4670,7 @@ static int cgroup_may_write(const struct cgroup *cgrp, struct super_block *sb)
if (!inode)
return -ENOMEM;
- ret = inode_permission(inode, MAY_WRITE);
+ ret = inode_permission(&init_user_ns, inode, MAY_WRITE);
iput(inode);
return ret;
}