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| author |   Al Viro <viro@zeniv.linux.org.uk> | 2019-05-12 18:16:04 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2019-05-25 18:00:01 -0400 |
| commit | 059338aae33165179352a26b58d815801072c87d (patch) | |
| tree | ad75b40c28596ac0ccd50a2588f7e1444243a811 /fs/super.c | |
| parent | cpuset: move mount -t cpuset logics into cgroup.c (diff) | |
| download | linux-dev-059338aae33165179352a26b58d815801072c87d.tar.xz linux-dev-059338aae33165179352a26b58d815801072c87d.zip | |
move mount_capable() calls to vfs_get_tree()
sget_fc() is called only from ->get_tree() instances and
the only instance not calling it is legacy_get_tree(),
which calls mount_capable() directly.
In all sget_fc() callers the checks could be moved to the
very beginning of ->get_tree() - ->user_ns is not changed
in between. So lifting the checks to the only caller of
->get_tree() is OK.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/super.c')
| -rw-r--r-- | fs/super.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/fs/super.c b/fs/super.c index d1e2f46bad7e..2c38541cd89f 100644 --- a/fs/super.c +++ b/fs/super.c @@ -514,12 +514,6 @@ struct super_block *sget_fc(struct fs_context *fc, struct user_namespace *user_ns = fc->global ? &init_user_ns : fc->user_ns; int err; - if (!(fc->sb_flags & SB_KERNMOUNT) && - fc->purpose != FS_CONTEXT_FOR_SUBMOUNT) { - if (!mount_capable(fc)) - return ERR_PTR(-EPERM); - } - retry: spin_lock(&sb_lock); if (test) { @@ -1421,6 +1415,12 @@ 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. */ |