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 /kernel/futex.c | |
| parent | b103c59883f1ec6e4d548b25054608cb5724453c (diff) | |
| download | linux-76aac0e9a17742e60d408be1a706e9aaad370891.tar.gz | |
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 'kernel/futex.c')
| -rw-r--r-- | kernel/futex.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/kernel/futex.c b/kernel/futex.c index 8af10027514b..e06962132aaf 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -439,10 +439,11 @@ static void free_pi_state(struct futex_pi_state *pi_state) static struct task_struct * futex_find_get_task(pid_t pid) { struct task_struct *p; + uid_t euid = current_euid(); rcu_read_lock(); p = find_task_by_vpid(pid); - if (!p || ((current->euid != p->euid) && (current->euid != p->uid))) + if (!p || (euid != p->euid && euid != p->uid)) p = ERR_PTR(-ESRCH); else get_task_struct(p); @@ -1829,6 +1830,7 @@ sys_get_robust_list(int pid, struct robust_list_head __user * __user *head_ptr, { struct robust_list_head __user *head; unsigned long ret; + uid_t euid = current_euid(); if (!futex_cmpxchg_enabled) return -ENOSYS; @@ -1844,8 +1846,8 @@ sys_get_robust_list(int pid, struct robust_list_head __user * __user *head_ptr, if (!p) goto err_unlock; ret = -EPERM; - if ((current->euid != p->euid) && (current->euid != p->uid) && - !capable(CAP_SYS_PTRACE)) + if (euid != p->euid && euid != p->uid && + !capable(CAP_SYS_PTRACE)) goto err_unlock; head = p->robust_list; rcu_read_unlock(); |