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author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-27 04:16:07 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-27 04:16:07 (GMT) |
commit | d895cb1af15c04c522a25c79cc429076987c089b (patch) | |
tree | 895dc9157e28f603d937a58be664e4e440d5530c /fs/namespace.c | |
parent | 9626357371b519f2b955fef399647181034a77fe (diff) | |
parent | d3d009cb965eae7e002ea5badf603ea8f4c34915 (diff) | |
download | linux-fsl-qoriq-d895cb1af15c04c522a25c79cc429076987c089b.tar.xz |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs pile (part one) from Al Viro:
"Assorted stuff - cleaning namei.c up a bit, fixing ->d_name/->d_parent
locking violations, etc.
The most visible changes here are death of FS_REVAL_DOT (replaced with
"has ->d_weak_revalidate()") and a new helper getting from struct file
to inode. Some bits of preparation to xattr method interface changes.
Misc patches by various people sent this cycle *and* ocfs2 fixes from
several cycles ago that should've been upstream right then.
PS: the next vfs pile will be xattr stuff."
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (46 commits)
saner proc_get_inode() calling conventions
proc: avoid extra pde_put() in proc_fill_super()
fs: change return values from -EACCES to -EPERM
fs/exec.c: make bprm_mm_init() static
ocfs2/dlm: use GFP_ATOMIC inside a spin_lock
ocfs2: fix possible use-after-free with AIO
ocfs2: Fix oops in ocfs2_fast_symlink_readpage() code path
get_empty_filp()/alloc_file() leave both ->f_pos and ->f_version zero
target: writev() on single-element vector is pointless
export kernel_write(), convert open-coded instances
fs: encode_fh: return FILEID_INVALID if invalid fid_type
kill f_vfsmnt
vfs: kill FS_REVAL_DOT by adding a d_weak_revalidate dentry op
nfsd: handle vfs_getattr errors in acl protocol
switch vfs_getattr() to struct path
default SET_PERSONALITY() in linux/elf.h
ceph: prepopulate inodes only when request is aborted
d_hash_and_lookup(): export, switch open-coded instances
9p: switch v9fs_set_create_acl() to inode+fid, do it before d_instantiate()
9p: split dropping the acls from v9fs_set_create_acl()
...
Diffstat (limited to 'fs/namespace.c')
-rw-r--r-- | fs/namespace.c | 42 |
1 files changed, 8 insertions, 34 deletions
diff --git a/fs/namespace.c b/fs/namespace.c index edac42c..50ca17d 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -384,7 +384,7 @@ EXPORT_SYMBOL_GPL(mnt_clone_write); */ int __mnt_want_write_file(struct file *file) { - struct inode *inode = file->f_dentry->d_inode; + struct inode *inode = file_inode(file); if (!(file->f_mode & FMODE_WRITE) || special_file(inode->i_mode)) return __mnt_want_write(file->f_path.mnt); @@ -1300,24 +1300,6 @@ SYSCALL_DEFINE1(oldumount, char __user *, name) #endif -static int mount_is_safe(struct path *path) -{ - if (may_mount()) - return 0; - return -EPERM; -#ifdef notyet - if (S_ISLNK(path->dentry->d_inode->i_mode)) - return -EPERM; - if (path->dentry->d_inode->i_mode & S_ISVTX) { - if (current_uid() != path->dentry->d_inode->i_uid) - return -EPERM; - } - if (inode_permission(path->dentry->d_inode, MAY_WRITE)) - return -EPERM; - return 0; -#endif -} - static bool mnt_ns_loop(struct path *path) { /* Could bind mounting the mount namespace inode cause a @@ -1640,9 +1622,6 @@ static int do_change_type(struct path *path, int flag) int type; int err = 0; - if (!may_mount()) - return -EPERM; - if (path->dentry != path->mnt->mnt_root) return -EINVAL; @@ -1676,9 +1655,7 @@ static int do_loopback(struct path *path, const char *old_name, LIST_HEAD(umount_list); struct path old_path; struct mount *mnt = NULL, *old; - int err = mount_is_safe(path); - if (err) - return err; + int err; if (!old_name || !*old_name) return -EINVAL; err = kern_path(old_name, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &old_path); @@ -1755,9 +1732,6 @@ static int do_remount(struct path *path, int flags, int mnt_flags, struct super_block *sb = path->mnt->mnt_sb; struct mount *mnt = real_mount(path->mnt); - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - if (!check_mnt(mnt)) return -EINVAL; @@ -1771,6 +1745,8 @@ static int do_remount(struct path *path, int flags, int mnt_flags, down_write(&sb->s_umount); if (flags & MS_BIND) err = change_mount_flags(path->mnt, flags); + else if (!capable(CAP_SYS_ADMIN)) + err = -EPERM; else err = do_remount_sb(sb, flags, data, 0); if (!err) { @@ -1803,9 +1779,7 @@ static int do_move_mount(struct path *path, const char *old_name) struct path old_path, parent_path; struct mount *p; struct mount *old; - int err = 0; - if (!may_mount()) - return -EPERM; + int err; if (!old_name || !*old_name) return -EINVAL; err = kern_path(old_name, LOOKUP_FOLLOW, &old_path); @@ -1947,9 +1921,6 @@ static int do_new_mount(struct path *path, const char *fstype, int flags, if (!fstype) return -EINVAL; - if (!may_mount()) - return -EPERM; - type = get_fs_type(fstype); if (!type) return -ENODEV; @@ -2263,6 +2234,9 @@ long do_mount(const char *dev_name, const char *dir_name, if (retval) goto dput_out; + if (!may_mount()) + return -EPERM; + /* Default to relatime unless overriden */ if (!(flags & MS_NOATIME)) mnt_flags |= MNT_RELATIME; |