int __ptrace_may_access(struct task_struct *task, unsigned int mode)
{
+ struct cred *cred = current->cred, *tcred = task->cred;
+
/* May we inspect the given task?
* This check is used both for attaching with ptrace
* and for allowing access to sensitive information in /proc.
* because setting up the necessary parent/child relationship
* or halting the specified task is impossible.
*/
- uid_t uid;
- gid_t gid;
+ uid_t uid = cred->uid;
+ gid_t gid = cred->gid;
int dumpable = 0;
/* Don't let security modules deny introspection */
if (task == current)
return 0;
- current_uid_gid(&uid, &gid);
- if ((uid != task->euid ||
- uid != task->suid ||
- uid != task->uid ||
- gid != task->egid ||
- gid != task->sgid ||
- gid != task->gid) && !capable(CAP_SYS_PTRACE))
+ if ((uid != tcred->euid ||
+ uid != tcred->suid ||
+ uid != tcred->uid ||
+ gid != tcred->egid ||
+ gid != tcred->sgid ||
+ gid != tcred->gid) && !capable(CAP_SYS_PTRACE))
return -EPERM;
smp_rmb();
if (task->mm)