diff options
| -rw-r--r-- | mm/mempolicy.c | 32 | ||||
| -rw-r--r-- | mm/migrate.c | 36 |
2 files changed, 38 insertions, 30 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 0a375706763..71e1a523e20 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1323,12 +1323,9 @@ SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode, err = -ESRCH; goto out; } - mm = get_task_mm(task); - rcu_read_unlock(); + get_task_struct(task); err = -EINVAL; - if (!mm) - goto out; /* * Check if this process has the right to modify the specified @@ -1336,14 +1333,13 @@ SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode, * capabilities, superuser privileges or the same * userid as the target process. */ - rcu_read_lock(); tcred = __task_cred(task); if (cred->euid != tcred->suid && cred->euid != tcred->uid && cred->uid != tcred->suid && cred->uid != tcred->uid && !capable(CAP_SYS_NICE)) { rcu_read_unlock(); err = -EPERM; - goto out; + goto out_put; } rcu_read_unlock(); @@ -1351,26 +1347,36 @@ SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode, /* Is the user allowed to access the target nodes? */ if (!nodes_subset(*new, task_nodes) && !capable(CAP_SYS_NICE)) { err = -EPERM; - goto out; + goto out_put; } if (!nodes_subset(*new, node_states[N_HIGH_MEMORY])) { err = -EINVAL; - goto out; + goto out_put; } err = security_task_movememory(task); if (err) - goto out; + goto out_put; - err = do_migrate_pages(mm, old, new, - capable(CAP_SYS_NICE) ? MPOL_MF_MOVE_ALL : MPOL_MF_MOVE); -out: + mm = get_task_mm(task); + put_task_struct(task); if (mm) - mmput(mm); + err = do_migrate_pages(mm, old, new, + capable(CAP_SYS_NICE) ? MPOL_MF_MOVE_ALL : MPOL_MF_MOVE); + else + err = -EINVAL; + + mmput(mm); +out: NODEMASK_SCRATCH_FREE(scratch); return err; + +out_put: + put_task_struct(task); + goto out; + } diff --git a/mm/migrate.c b/mm/migrate.c index 1503b6b54ec..51c08a0c6f6 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1174,20 +1174,17 @@ set_status: * Migrate an array of page address onto an array of nodes and fill * the corresponding array of status. */ -static int do_pages_move(struct mm_struct *mm, struct task_struct *task, +static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, unsigned long nr_pages, const void __user * __user *pages, const int __user *nodes, int __user *status, int flags) { struct page_to_node *pm; - nodemask_t task_nodes; unsigned long chunk_nr_pages; unsigned long chunk_start; int err; - task_nodes = cpuset_mems_allowed(task); - err = -ENOMEM; pm = (struct page_to_node *)__get_free_page(GFP_KERNEL); if (!pm) @@ -1349,6 +1346,7 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages, struct task_struct *task; struct mm_struct *mm; int err; + nodemask_t task_nodes; /* Check flags */ if (flags & ~(MPOL_MF_MOVE|MPOL_MF_MOVE_ALL)) @@ -1364,11 +1362,7 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages, rcu_read_unlock(); return -ESRCH; } - mm = get_task_mm(task); - rcu_read_unlock(); - - if (!mm) - return -EINVAL; + get_task_struct(task); /* * Check if this process has the right to modify the specified @@ -1376,7 +1370,6 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages, * capabilities, superuser privileges or the same * userid as the target process. */ - rcu_read_lock(); tcred = __task_cred(task); if (cred->euid != tcred->suid && cred->euid != tcred->uid && cred->uid != tcred->suid && cred->uid != tcred->uid && @@ -1391,16 +1384,25 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages, if (err) goto out; - if (nodes) { - err = do_pages_move(mm, task, nr_pages, pages, nodes, status, - flags); - } else { - err = do_pages_stat(mm, nr_pages, pages, status); - } + task_nodes = cpuset_mems_allowed(task); + mm = get_task_mm(task); + put_task_struct(task); + + if (mm) { + if (nodes) + err = do_pages_move(mm, task_nodes, nr_pages, pages, + nodes, status, flags); + else + err = do_pages_stat(mm, nr_pages, pages, status); + } else + err = -EINVAL; -out: mmput(mm); return err; + +out: + put_task_struct(task); + return err; } /* |