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userns: Convert ipc to use kuid and kgid where appropriate

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- Store the ipc owner and creator with a kuid
- Store the ipc group and the crators group with a kgid.
- Add error handling to ipc_update_perms, allowing it to
  fail if the uids and gids can not be converted to kuids
  or kgids.
- Modify the proc files to display the ipc creator and
  owner in the user namespace of the opener of the proc file.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2012-02-07 16:54:11 -08:00
commit 1efdb69b0b
7 changed files with 55 additions and 38 deletions
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9
include/linux/ipc.h
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@ -79,6 +79,7 @@ struct ipc_kludge {
#ifdef __KERNEL__
#include <linux/spinlock.h>
#include <linux/uidgid.h>
#define IPCMNI 32768 /* <= MAX_INT limit for ipc arrays (including sysctl changes) */
@ -89,10 +90,10 @@ struct kern_ipc_perm
int deleted;
int id;
key_t key;
uid_t uid;
gid_t gid;
uid_t cuid;
gid_t cgid;
kuid_t uid;
kgid_t gid;
kuid_t cuid;
kgid_t cgid;
umode_t mode;
unsigned long seq;
void *security;