diff options
| author | David Howells <dhowells@redhat.com> | 2008-11-14 10:39:12 +1100 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2008-11-14 10:39:12 +1100 |
| commit | 76aac0e9a17742e60d408be1a706e9aaad370891 (patch) | |
| tree | e873a000d9c96209726e0958e311f005c13b2ed5 /mm/mempolicy.c | |
| parent | b103c59883f1ec6e4d548b25054608cb5724453c (diff) | |
| download | lwn-76aac0e9a17742e60d408be1a706e9aaad370891.tar.gz lwn-76aac0e9a17742e60d408be1a706e9aaad370891.zip | |
CRED: Wrap task credential accesses in the core kernel
Wrap access to task credentials so that they can be separated more easily from
the task_struct during the introduction of COW creds.
Change most current->(|e|s|fs)[ug]id to current_(|e|s|fs)[ug]id().
Change some task->e?[ug]id to task_e?[ug]id(). In some places it makes more
sense to use RCU directly rather than a convenient wrapper; these will be
addressed by later patches.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-audit@redhat.com
Cc: containers@lists.linux-foundation.org
Cc: linux-mm@kvack.org
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'mm/mempolicy.c')
| -rw-r--r-- | mm/mempolicy.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 36f42573a335..07a96474077d 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1115,6 +1115,7 @@ asmlinkage long sys_migrate_pages(pid_t pid, unsigned long maxnode, nodemask_t old; nodemask_t new; nodemask_t task_nodes; + uid_t uid, euid; int err; err = get_nodes(&old, old_nodes, maxnode); @@ -1144,8 +1145,10 @@ asmlinkage long sys_migrate_pages(pid_t pid, unsigned long maxnode, * capabilities, superuser privileges or the same * userid as the target process. */ - if ((current->euid != task->suid) && (current->euid != task->uid) && - (current->uid != task->suid) && (current->uid != task->uid) && + uid = current_uid(); + euid = current_euid(); + if (euid != task->suid && euid != task->uid && + uid != task->suid && uid != task->uid && !capable(CAP_SYS_NICE)) { err = -EPERM; goto out; |