[PATCH 43/43] userns: Convert the move_pages, and migrate_pages permission checks to use uid_eq

"Eric W. Beiderman
2012-04-08T05:13:30Z

From: Eric W. Biederman <ebiederm@xmission.com>

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
mm/mempolicy.c | 4 ++--
mm/migrate.c | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index cfb6c86..7b44fc8 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1334,8 +1334,8 @@ SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode,
* userid as the target process.
*/
tcred = __task_cred(task);
- if (cred->euid != tcred->suid && cred->euid != tcred->uid &&
- cred->uid != tcred->suid && cred->uid != tcred->uid &&
+ if (!uid_eq(cred->euid, tcred->suid) && !uid_eq(cred->euid, tcred->uid) &&
+ !uid_eq(cred->uid, tcred->suid) && !uid_eq(cred->uid, tcred->uid) &&
!capable(CAP_SYS_NICE)) {
rcu_read_unlock();
err = -EPERM;
diff --git a/mm/migrate.c b/mm/migrate.c
index 51c08a0..1cf5252 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1371,8 +1371,8 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages,
* userid as the target process.
*/
tcred = __task_cred(task);
- if (cred->euid != tcred->suid && cred->euid != tcred->uid &&
- cred->uid != tcred->suid && cred->uid != tcred->uid &&
+ if (!uid_eq(cred->euid, tcred->suid) && !uid_eq(cred->euid, tcred->uid) &&
+ !uid_eq(cred->uid, tcred->suid) && !uid_eq(cred->uid, tcred->uid) &&
!capable(CAP_SYS_NICE)) {
rcu_read_unlock();
err = -EPERM;
--
1.7.2.5