diff options
Diffstat (limited to 'kernel/fork.c')
-rw-r--r-- | kernel/fork.c | 203 |
1 files changed, 122 insertions, 81 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 2c8857e12855..a31b823b3c2d 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -146,7 +146,7 @@ void __weak arch_release_thread_info(struct thread_info *ti) static struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node) { - struct page *page = alloc_pages_node(node, THREADINFO_GFP, + struct page *page = alloc_pages_node(node, THREADINFO_GFP_ACCOUNTED, THREAD_SIZE_ORDER); return page ? page_address(page) : NULL; @@ -154,7 +154,7 @@ static struct thread_info *alloc_thread_info_node(struct task_struct *tsk, static inline void free_thread_info(struct thread_info *ti) { - free_pages((unsigned long)ti, THREAD_SIZE_ORDER); + free_memcg_kmem_pages((unsigned long)ti, THREAD_SIZE_ORDER); } # else static struct kmem_cache *thread_info_cache; @@ -330,6 +330,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig) tsk->btrace_seq = 0; #endif tsk->splice_pipe = NULL; + tsk->task_frag.page = NULL; account_kernel_stack(ti, 1); @@ -351,8 +352,10 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm) unsigned long charge; struct mempolicy *pol; + uprobe_start_dup_mmap(); down_write(&oldmm->mmap_sem); flush_cache_dup_mm(oldmm); + uprobe_dup_mmap(oldmm, mm); /* * Not linked in yet - no deadlock potential: */ @@ -421,7 +424,12 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm) mapping->i_mmap_writable++; flush_dcache_mmap_lock(mapping); /* insert tmp into the share list, just after mpnt */ - vma_prio_tree_add(tmp, mpnt); + if (unlikely(tmp->vm_flags & VM_NONLINEAR)) + vma_nonlinear_insert(tmp, + &mapping->i_mmap_nonlinear); + else + vma_interval_tree_insert_after(tmp, mpnt, + &mapping->i_mmap); flush_dcache_mmap_unlock(mapping); mutex_unlock(&mapping->i_mmap_mutex); } @@ -454,9 +462,6 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm) if (retval) goto out; - - if (file) - uprobe_mmap(tmp); } /* a new mm has just been created */ arch_dup_mmap(oldmm, mm); @@ -465,6 +470,7 @@ out: up_write(&mm->mmap_sem); flush_tlb_mm(oldmm); up_write(&oldmm->mmap_sem); + uprobe_end_dup_mmap(); return retval; fail_nomem_anon_vma_fork: mpol_put(pol); @@ -623,26 +629,6 @@ void mmput(struct mm_struct *mm) } EXPORT_SYMBOL_GPL(mmput); -/* - * We added or removed a vma mapping the executable. The vmas are only mapped - * during exec and are not mapped with the mmap system call. - * Callers must hold down_write() on the mm's mmap_sem for these - */ -void added_exe_file_vma(struct mm_struct *mm) -{ - mm->num_exe_file_vmas++; -} - -void removed_exe_file_vma(struct mm_struct *mm) -{ - mm->num_exe_file_vmas--; - if ((mm->num_exe_file_vmas == 0) && mm->exe_file) { - fput(mm->exe_file); - mm->exe_file = NULL; - } - -} - void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) { if (new_exe_file) @@ -650,15 +636,13 @@ void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) if (mm->exe_file) fput(mm->exe_file); mm->exe_file = new_exe_file; - mm->num_exe_file_vmas = 0; } struct file *get_mm_exe_file(struct mm_struct *mm) { struct file *exe_file; - /* We need mmap_sem to protect against races with removal of - * VM_EXECUTABLE vmas */ + /* We need mmap_sem to protect against races with removal of exe_file */ down_read(&mm->mmap_sem); exe_file = mm->exe_file; if (exe_file) @@ -839,8 +823,9 @@ struct mm_struct *dup_mm(struct task_struct *tsk) #ifdef CONFIG_TRANSPARENT_HUGEPAGE mm->pmd_huge_pte = NULL; #endif - uprobe_reset_state(mm); - +#ifdef CONFIG_NUMA_BALANCING + mm->first_nid = NUMA_PTE_SCAN_INIT; +#endif if (!mm_init(mm, tsk)) goto fail_nomem; @@ -1059,8 +1044,6 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk) atomic_set(&sig->live, 1); atomic_set(&sig->sigcnt, 1); init_waitqueue_head(&sig->wait_chldexit); - if (clone_flags & CLONE_NEWPID) - sig->flags |= SIGNAL_UNKILLABLE; sig->curr_target = tsk; init_sigpending(&sig->shared_pending); INIT_LIST_HEAD(&sig->posix_timers); @@ -1081,7 +1064,6 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk) init_rwsem(&sig->group_rwsem); #endif - sig->oom_adj = current->signal->oom_adj; sig->oom_score_adj = current->signal->oom_score_adj; sig->oom_score_adj_min = current->signal->oom_score_adj_min; @@ -1148,7 +1130,6 @@ static void posix_cpu_timers_init(struct task_struct *tsk) */ static struct task_struct *copy_process(unsigned long clone_flags, unsigned long stack_start, - struct pt_regs *regs, unsigned long stack_size, int __user *child_tidptr, struct pid *pid, @@ -1156,7 +1137,6 @@ static struct task_struct *copy_process(unsigned long clone_flags, { int retval; struct task_struct *p; - int cgroup_callbacks_done = 0; if ((clone_flags & (CLONE_NEWNS|CLONE_FS)) == (CLONE_NEWNS|CLONE_FS)) return ERR_PTR(-EINVAL); @@ -1243,7 +1223,7 @@ static struct task_struct *copy_process(unsigned long clone_flags, p->utime = p->stime = p->gtime = 0; p->utimescaled = p->stimescaled = 0; #ifndef CONFIG_VIRT_CPU_ACCOUNTING - p->prev_utime = p->prev_stime = 0; + p->prev_cputime.utime = p->prev_cputime.stime = 0; #endif #if defined(SPLIT_RSS_COUNTING) memset(&p->rss_stat, 0, sizeof(p->rss_stat)); @@ -1280,11 +1260,7 @@ static struct task_struct *copy_process(unsigned long clone_flags, #endif #ifdef CONFIG_TRACE_IRQFLAGS p->irq_events = 0; -#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW - p->hardirqs_enabled = 1; -#else p->hardirqs_enabled = 0; -#endif p->hardirq_enable_ip = 0; p->hardirq_enable_event = 0; p->hardirq_disable_ip = _THIS_IP_; @@ -1345,7 +1321,7 @@ static struct task_struct *copy_process(unsigned long clone_flags, retval = copy_io(clone_flags, p); if (retval) goto bad_fork_cleanup_namespaces; - retval = copy_thread(clone_flags, stack_start, stack_size, p, regs); + retval = copy_thread(clone_flags, stack_start, stack_size, p); if (retval) goto bad_fork_cleanup_io; @@ -1418,12 +1394,6 @@ static struct task_struct *copy_process(unsigned long clone_flags, INIT_LIST_HEAD(&p->thread_group); p->task_works = NULL; - /* Now that the task is set up, run cgroup callbacks if - * necessary. We need to run them before the task is visible - * on the tasklist. */ - cgroup_fork_callbacks(p); - cgroup_callbacks_done = 1; - /* Need tasklist lock for parent etc handling! */ write_lock_irq(&tasklist_lock); @@ -1466,8 +1436,10 @@ static struct task_struct *copy_process(unsigned long clone_flags, ptrace_init_task(p, (clone_flags & CLONE_PTRACE) || trace); if (thread_group_leader(p)) { - if (is_child_reaper(pid)) - p->nsproxy->pid_ns->child_reaper = p; + if (is_child_reaper(pid)) { + ns_of_pid(pid)->child_reaper = p; + p->signal->flags |= SIGNAL_UNKILLABLE; + } p->signal->leader_pid = pid; p->signal->tty = tty_kref_get(current->signal->tty); @@ -1501,8 +1473,6 @@ bad_fork_cleanup_io: if (p->io_context) exit_io_context(p); bad_fork_cleanup_namespaces: - if (unlikely(clone_flags & CLONE_NEWPID)) - pid_ns_release_proc(p->nsproxy->pid_ns); exit_task_namespaces(p); bad_fork_cleanup_mm: if (p->mm) @@ -1528,7 +1498,7 @@ bad_fork_cleanup_cgroup: #endif if (clone_flags & CLONE_THREAD) threadgroup_change_end(current); - cgroup_exit(p, cgroup_callbacks_done); + cgroup_exit(p, 0); delayacct_tsk_free(p); module_put(task_thread_info(p)->exec_domain->module); bad_fork_cleanup_count: @@ -1540,12 +1510,6 @@ fork_out: return ERR_PTR(retval); } -noinline struct pt_regs * __cpuinit __attribute__((weak)) idle_regs(struct pt_regs *regs) -{ - memset(regs, 0, sizeof(struct pt_regs)); - return regs; -} - static inline void init_idle_pids(struct pid_link *links) { enum pid_type type; @@ -1559,10 +1523,7 @@ static inline void init_idle_pids(struct pid_link *links) struct task_struct * __cpuinit fork_idle(int cpu) { struct task_struct *task; - struct pt_regs regs; - - task = copy_process(CLONE_VM, 0, idle_regs(®s), 0, NULL, - &init_struct_pid, 0); + task = copy_process(CLONE_VM, 0, 0, NULL, &init_struct_pid, 0); if (!IS_ERR(task)) { init_idle_pids(task->pids); init_idle(task, cpu); @@ -1579,7 +1540,6 @@ struct task_struct * __cpuinit fork_idle(int cpu) */ long do_fork(unsigned long clone_flags, unsigned long stack_start, - struct pt_regs *regs, unsigned long stack_size, int __user *parent_tidptr, int __user *child_tidptr) @@ -1592,15 +1552,9 @@ long do_fork(unsigned long clone_flags, * Do some preliminary argument and permissions checking before we * actually start allocating stuff */ - if (clone_flags & CLONE_NEWUSER) { - if (clone_flags & CLONE_THREAD) + if (clone_flags & (CLONE_NEWUSER | CLONE_NEWPID)) { + if (clone_flags & (CLONE_THREAD|CLONE_PARENT)) return -EINVAL; - /* hopefully this check will go away when userns support is - * complete - */ - if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SETUID) || - !capable(CAP_SETGID)) - return -EPERM; } /* @@ -1609,7 +1563,7 @@ long do_fork(unsigned long clone_flags, * requested, no event is reported; otherwise, report if the event * for the type of forking is enabled. */ - if (likely(user_mode(regs)) && !(clone_flags & CLONE_UNTRACED)) { + if (!(clone_flags & CLONE_UNTRACED)) { if (clone_flags & CLONE_VFORK) trace = PTRACE_EVENT_VFORK; else if ((clone_flags & CSIGNAL) != SIGCHLD) @@ -1621,7 +1575,7 @@ long do_fork(unsigned long clone_flags, trace = 0; } - p = copy_process(clone_flags, stack_start, regs, stack_size, + p = copy_process(clone_flags, stack_start, stack_size, child_tidptr, NULL, trace); /* * Do this prior waking up the new thread - the thread pointer @@ -1659,6 +1613,58 @@ long do_fork(unsigned long clone_flags, return nr; } +/* + * Create a kernel thread. + */ +pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) +{ + return do_fork(flags|CLONE_VM|CLONE_UNTRACED, (unsigned long)fn, + (unsigned long)arg, NULL, NULL); +} + +#ifdef __ARCH_WANT_SYS_FORK +SYSCALL_DEFINE0(fork) +{ +#ifdef CONFIG_MMU + return do_fork(SIGCHLD, 0, 0, NULL, NULL); +#else + /* can not support in nommu mode */ + return(-EINVAL); +#endif +} +#endif + +#ifdef __ARCH_WANT_SYS_VFORK +SYSCALL_DEFINE0(vfork) +{ + return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0, + 0, NULL, NULL); +} +#endif + +#ifdef __ARCH_WANT_SYS_CLONE +#ifdef CONFIG_CLONE_BACKWARDS +SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp, + int __user *, parent_tidptr, + int, tls_val, + int __user *, child_tidptr) +#elif defined(CONFIG_CLONE_BACKWARDS2) +SYSCALL_DEFINE5(clone, unsigned long, newsp, unsigned long, clone_flags, + int __user *, parent_tidptr, + int __user *, child_tidptr, + int, tls_val) +#else +SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp, + int __user *, parent_tidptr, + int __user *, child_tidptr, + int, tls_val) +#endif +{ + return do_fork(clone_flags, newsp, 0, + parent_tidptr, child_tidptr); +} +#endif + #ifndef ARCH_MIN_MMSTRUCT_ALIGN #define ARCH_MIN_MMSTRUCT_ALIGN 0 #endif @@ -1708,7 +1714,8 @@ static int check_unshare_flags(unsigned long unshare_flags) { if (unshare_flags & ~(CLONE_THREAD|CLONE_FS|CLONE_NEWNS|CLONE_SIGHAND| CLONE_VM|CLONE_FILES|CLONE_SYSVSEM| - CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWNET)) + CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWNET| + CLONE_NEWUSER|CLONE_NEWPID)) return -EINVAL; /* * Not implemented, but pretend it works if there is nothing to @@ -1775,19 +1782,40 @@ SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags) { struct fs_struct *fs, *new_fs = NULL; struct files_struct *fd, *new_fd = NULL; + struct cred *new_cred = NULL; struct nsproxy *new_nsproxy = NULL; int do_sysvsem = 0; int err; - err = check_unshare_flags(unshare_flags); - if (err) - goto bad_unshare_out; - + /* + * If unsharing a user namespace must also unshare the thread. + */ + if (unshare_flags & CLONE_NEWUSER) + unshare_flags |= CLONE_THREAD; + /* + * If unsharing a pid namespace must also unshare the thread. + */ + if (unshare_flags & CLONE_NEWPID) + unshare_flags |= CLONE_THREAD; + /* + * If unsharing a thread from a thread group, must also unshare vm. + */ + if (unshare_flags & CLONE_THREAD) + unshare_flags |= CLONE_VM; + /* + * If unsharing vm, must also unshare signal handlers. + */ + if (unshare_flags & CLONE_VM) + unshare_flags |= CLONE_SIGHAND; /* * If unsharing namespace, must also unshare filesystem information. */ if (unshare_flags & CLONE_NEWNS) unshare_flags |= CLONE_FS; + + err = check_unshare_flags(unshare_flags); + if (err) + goto bad_unshare_out; /* * CLONE_NEWIPC must also detach from the undolist: after switching * to a new ipc namespace, the semaphore arrays from the old @@ -1801,11 +1829,15 @@ SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags) err = unshare_fd(unshare_flags, &new_fd); if (err) goto bad_unshare_cleanup_fs; - err = unshare_nsproxy_namespaces(unshare_flags, &new_nsproxy, new_fs); + err = unshare_userns(unshare_flags, &new_cred); if (err) goto bad_unshare_cleanup_fd; + err = unshare_nsproxy_namespaces(unshare_flags, &new_nsproxy, + new_cred, new_fs); + if (err) + goto bad_unshare_cleanup_cred; - if (new_fs || new_fd || do_sysvsem || new_nsproxy) { + if (new_fs || new_fd || do_sysvsem || new_cred || new_nsproxy) { if (do_sysvsem) { /* * CLONE_SYSVSEM is equivalent to sys_exit(). @@ -1838,11 +1870,20 @@ SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags) } task_unlock(current); + + if (new_cred) { + /* Install the new user namespace */ + commit_creds(new_cred); + new_cred = NULL; + } } if (new_nsproxy) put_nsproxy(new_nsproxy); +bad_unshare_cleanup_cred: + if (new_cred) + put_cred(new_cred); bad_unshare_cleanup_fd: if (new_fd) put_files_struct(new_fd); |