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userns: Teach security_path_chown to take kuids and kgids 

Don't make the security modules deal with raw user space uid and
gids instead pass in a kuid_t and a kgid_t so that security modules
only have to deal with internal kernel uids and gids.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: James Morris <james.l.morris@oracle.com>
Cc: John Johansen <john.johansen@canonical.com>
Cc: Kentaro Takeda <takedakn@nttdata.co.jp>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2012-06-01 16:14:19 -06:00
parent 8b94eea4bf
commit d2b31ca644
6 changed files with 14 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/open.c
View File

@ -534,7 +534,7 @@ static int chown_common(struct path *path, uid_t user, gid_t group)
newattrs.ia_valid |=
ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV;
mutex_lock(&inode->i_mutex);
error = security_path_chown(path, user, group);
error = security_path_chown(path, uid, gid);
if (!error)
error = notify_change(path->dentry, &newattrs);
mutex_unlock(&inode->i_mutex);

6
include/linux/security.h
View File

@ -1437,7 +1437,7 @@ struct security_operations {
int (*path_rename) (struct path *old_dir, struct dentry *old_dentry,
struct path *new_dir, struct dentry *new_dentry);
int (*path_chmod) (struct path *path, umode_t mode);
int (*path_chown) (struct path *path, uid_t uid, gid_t gid);
int (*path_chown) (struct path *path, kuid_t uid, kgid_t gid);
int (*path_chroot) (struct path *path);
#endif
@ -2832,7 +2832,7 @@ int security_path_link(struct dentry *old_dentry, struct path *new_dir,
int security_path_rename(struct path *old_dir, struct dentry *old_dentry,
struct path *new_dir, struct dentry *new_dentry);
int security_path_chmod(struct path *path, umode_t mode);
int security_path_chown(struct path *path, uid_t uid, gid_t gid);
int security_path_chown(struct path *path, kuid_t uid, kgid_t gid);
int security_path_chroot(struct path *path);
#else /* CONFIG_SECURITY_PATH */
static inline int security_path_unlink(struct path *dir, struct dentry *dentry)
@ -2888,7 +2888,7 @@ static inline int security_path_chmod(struct path *path, umode_t mode)
return 0;
}
static inline int security_path_chown(struct path *path, uid_t uid, gid_t gid)
static inline int security_path_chown(struct path *path, kuid_t uid, kgid_t gid)
{
return 0;
}

2
security/apparmor/lsm.c
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@ -352,7 +352,7 @@ static int apparmor_path_chmod(struct path *path, umode_t mode)
return common_perm_mnt_dentry(OP_CHMOD, path->mnt, path->dentry, AA_MAY_CHMOD);
}
static int apparmor_path_chown(struct path *path, uid_t uid, gid_t gid)
static int apparmor_path_chown(struct path *path, kuid_t uid, kgid_t gid)
{
struct path_cond cond = { path->dentry->d_inode->i_uid,
path->dentry->d_inode->i_mode

2
security/capability.c
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@ -284,7 +284,7 @@ static int cap_path_chmod(struct path *path, umode_t mode)
return 0;
}
static int cap_path_chown(struct path *path, uid_t uid, gid_t gid)
static int cap_path_chown(struct path *path, kuid_t uid, kgid_t gid)
{
return 0;
}

2
security/security.c
View File

@ -434,7 +434,7 @@ int security_path_chmod(struct path *path, umode_t mode)
return security_ops->path_chmod(path, mode);
}
int security_path_chown(struct path *path, uid_t uid, gid_t gid)
int security_path_chown(struct path *path, kuid_t uid, kgid_t gid)
{
if (unlikely(IS_PRIVATE(path->dentry->d_inode)))
return 0;

12
security/tomoyo/tomoyo.c
View File

@ -373,13 +373,15 @@ static int tomoyo_path_chmod(struct path *path, umode_t mode)
*
* Returns 0 on success, negative value otherwise.
*/
static int tomoyo_path_chown(struct path *path, uid_t uid, gid_t gid)
static int tomoyo_path_chown(struct path *path, kuid_t uid, kgid_t gid)
{
int error = 0;
if (uid != (uid_t) -1)
error = tomoyo_path_number_perm(TOMOYO_TYPE_CHOWN, path, uid);
if (!error && gid != (gid_t) -1)
error = tomoyo_path_number_perm(TOMOYO_TYPE_CHGRP, path, gid);
if (uid_valid(uid))
error = tomoyo_path_number_perm(TOMOYO_TYPE_CHOWN, path,
from_kuid(&init_user_ns, uid));
if (!error && gid_valid(gid))
error = tomoyo_path_number_perm(TOMOYO_TYPE_CHGRP, path,
from_kgid(&init_user_ns, gid));
return error;
}