diff options
| -rw-r--r-- | mm/mempolicy.c | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index a2af6d58a68f..dad166b736ba 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -85,6 +85,7 @@ #include <linux/interrupt.h> #include <linux/init.h> #include <linux/compat.h> +#include <linux/ptrace.h> #include <linux/swap.h> #include <linux/seq_file.h> #include <linux/proc_fs.h> @@ -1365,7 +1366,6 @@ SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode, const unsigned long __user *, old_nodes, const unsigned long __user *, new_nodes) { - const struct cred *cred = current_cred(), *tcred; struct mm_struct *mm = NULL; struct task_struct *task; nodemask_t task_nodes; @@ -1401,15 +1401,10 @@ SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode, err = -EINVAL; /* - * Check if this process has the right to modify the specified - * process. The right exists if the process has administrative - * capabilities, superuser privileges or the same - * userid as the target process. + * Check if this process has the right to modify the specified process. + * Use the regular "ptrace_may_access()" checks. */ - tcred = __task_cred(task); - 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)) { + if (!ptrace_may_access(task, PTRACE_MODE_READ_REALCREDS)) { rcu_read_unlock(); err = -EPERM; goto out_put; |