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userns: userns: check user namespace for task->file uid equivalence checks

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Cheat for now and say all files belong to init_user_ns.  Next step will be
to let superblocks belong to a user_ns, and derive inode_userns(inode)
from inode->i_sb->s_user_ns.  Finally we'll introduce more flexible
arrangements.

Changelog:
	Feb 15: make is_owner_or_cap take const struct inode
	Feb 23: make is_owner_or_cap bool

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Serge E. Hallyn <serge.hallyn@canonical.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Daniel Lezcano <daniel.lezcano@free.fr>
Acked-by: David Howells <dhowells@redhat.com>
Cc: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Serge E. Hallyn 2011-03-23 16:43:25 -07:00 • committed by Linus Torvalds
parent b0e77598f8
commit e795b71799
3 changed files with 40 additions and 7 deletions
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9
include/linux/fs.h
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@ -1457,8 +1457,13 @@ enum {
#define put_fs_excl() atomic_dec(&current->fs_excl)
#define has_fs_excl() atomic_read(&current->fs_excl)
#define is_owner_or_cap(inode) \
((current_fsuid() == (inode)->i_uid) || capable(CAP_FOWNER))
/*
* until VFS tracks user namespaces for inodes, just make all files
* belong to init_user_ns
*/
extern struct user_namespace init_user_ns;
#define inode_userns(inode) (&init_user_ns)
extern bool is_owner_or_cap(const struct inode *inode);
/* not quite ready to be deprecated, but... */
extern void lock_super(struct super_block *);