UBUNTU: [Config] CONFIG_W1_SLAVE_DS2438=m

[mirror_ubuntu-artful-kernel.git] / mm / migrate.c

diff --git a/mm/migrate.c b/mm/migrate.c
index 62767155187356d54d1fa7333ad402e76183ca0b..e84eeb4e43566c7b1ee85e3759b1b60b72c1c532 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -41,6 +41,7 @@
 #include <linux/page_idle.h>
 #include <linux/page_owner.h>
 #include <linux/sched/mm.h>
+#include <linux/ptrace.h>
 
 #include <asm/tlbflush.h>
 
@@ -1652,7 +1653,6 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages,
                const int __user *, nodes,
                int __user *, status, int, flags)
 {
-       const struct cred *cred = current_cred(), *tcred;
        struct task_struct *task;
        struct mm_struct *mm;
        int err;
@@ -1676,14 +1676,9 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages,
 
        /*
         * 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.
+        * 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;
@@ -1937,12 +1932,6 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
                put_page(new_page);
                goto out_fail;
        }
-       /*
-        * We are not sure a pending tlb flush here is for a huge page
-        * mapping or not. Hence use the tlb range variant
-        */
-       if (mm_tlb_flush_pending(mm))
-               flush_tlb_range(vma, mmun_start, mmun_end);
 
        /* Prepare a page as a migration target */
        __SetPageLocked(new_page);