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| author |   Al Viro <viro@zeniv.linux.org.uk> | 2019-05-13 12:57:22 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2019-05-25 18:00:02 -0400 |
| commit | c3aabf0780a506225b53bfe2b5177dd5dfec093d (patch) | |
| tree | 95e0457725a49ae8849f4e17014de6871b78cac3 /fs/super.c | |
| parent | move mount_capable() calls to vfs_get_tree() (diff) | |
| download | linux-dev-c3aabf0780a506225b53bfe2b5177dd5dfec093d.tar.xz linux-dev-c3aabf0780a506225b53bfe2b5177dd5dfec093d.zip | |
move mount_capable() further out
Call graph of vfs_get_tree():
vfs_fsconfig_locked() # neither kernmount, nor submount
do_new_mount() # neither kernmount, nor submount
fc_mount()
afs_mntpt_do_automount() # submount
mount_one_hugetlbfs() # kernmount
pid_ns_prepare_proc() # kernmount
mq_create_mount() # kernmount
vfs_kern_mount()
simple_pin_fs() # kernmount
vfs_submount() # submount
kern_mount() # kernmount
init_mount_tree()
btrfs_mount()
nfs_do_root_mount()
The first two need the check (unconditionally).
init_mount_tree() is setting rootfs up; any capability
checks make zero sense for that one. And btrfs_mount()/
nfs_do_root_mount() have the checks already done in their
callers.
IOW, we can shift mount_capable() handling into
the two callers - one in the normal case of mount(2),
another - in fsconfig(2) handling of FSCONFIG_CMD_CREATE.
I.e. the syscalls that set a new filesystem up.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/super.c')
| -rw-r--r-- | fs/super.c | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/fs/super.c b/fs/super.c index 2c38541cd89f..72b4a5afcfd6 100644 --- a/fs/super.c +++ b/fs/super.c @@ -1415,12 +1415,6 @@ int vfs_get_tree(struct fs_context *fc) if (fc->root) return -EBUSY; - if (!(fc->sb_flags & SB_KERNMOUNT) && - fc->purpose != FS_CONTEXT_FOR_SUBMOUNT) { - if (!mount_capable(fc)) - return -EPERM; - } - /* Get the mountable root in fc->root, with a ref on the root and a ref * on the superblock. */ |