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Diffstat (limited to 'kernel/fork.c')
-rw-r--r--kernel/fork.c66
1 files changed, 36 insertions, 30 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 3ca8f1f83fb3..d66cd1014211 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -225,8 +225,8 @@ static unsigned long *alloc_thread_stack_node(struct task_struct *tsk, int node)
if (!s)
continue;
- /* Clear the KASAN shadow of the stack. */
- kasan_unpoison_shadow(s->addr, THREAD_SIZE);
+ /* Mark stack accessible for KASAN. */
+ kasan_unpoison_range(s->addr, THREAD_SIZE);
/* Clear stale pointers from reused stack. */
memset(s->addr, 0, THREAD_SIZE);
@@ -385,7 +385,7 @@ static void account_kernel_stack(struct task_struct *tsk, int account)
mod_lruvec_page_state(vm->pages[0], NR_KERNEL_STACK_KB,
account * (THREAD_SIZE / 1024));
else
- mod_lruvec_slab_state(stack, NR_KERNEL_STACK_KB,
+ mod_lruvec_kmem_state(stack, NR_KERNEL_STACK_KB,
account * (THREAD_SIZE / 1024));
}
@@ -404,9 +404,10 @@ static int memcg_charge_kernel_stack(struct task_struct *tsk)
for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++) {
/*
- * If memcg_kmem_charge_page() fails, page->mem_cgroup
- * pointer is NULL, and memcg_kmem_uncharge_page() in
- * free_thread_stack() will ignore this page.
+ * If memcg_kmem_charge_page() fails, page's
+ * memory cgroup pointer is NULL, and
+ * memcg_kmem_uncharge_page() in free_thread_stack()
+ * will ignore this page.
*/
ret = memcg_kmem_charge_page(vm->pages[i], GFP_KERNEL,
0);
@@ -556,7 +557,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
get_file(file);
if (tmp->vm_flags & VM_DENYWRITE)
- atomic_dec(&inode->i_writecount);
+ put_write_access(inode);
i_mmap_lock_write(mapping);
if (tmp->vm_flags & VM_SHARED)
mapping_allow_writable(mapping);
@@ -818,9 +819,8 @@ void __init fork_init(void)
init_task.signal->rlim[RLIMIT_SIGPENDING] =
init_task.signal->rlim[RLIMIT_NPROC];
- for (i = 0; i < UCOUNT_COUNTS; i++) {
+ for (i = 0; i < UCOUNT_COUNTS; i++)
init_user_ns.ucount_max[i] = max_threads/2;
- }
#ifdef CONFIG_VMAP_STACK
cpuhp_setup_state(CPUHP_BP_PREPARE_DYN, "fork:vm_stack_cache",
@@ -906,6 +906,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
clear_user_return_notifier(tsk);
clear_tsk_need_resched(tsk);
set_task_stack_end_magic(tsk);
+ clear_syscall_work_syscall_user_dispatch(tsk);
#ifdef CONFIG_STACKPROTECTOR
tsk->stack_canary = get_random_canary();
@@ -930,6 +931,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
account_kernel_stack(tsk, 1);
kcov_task_init(tsk);
+ kmap_local_fork(tsk);
#ifdef CONFIG_FAULT_INJECTION
tsk->fail_nth = 0;
@@ -1007,6 +1009,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p,
mm->vmacache_seqnum = 0;
atomic_set(&mm->mm_users, 1);
atomic_set(&mm->mm_count, 1);
+ seqcount_init(&mm->write_protect_seq);
mmap_init_lock(mm);
INIT_LIST_HEAD(&mm->mmlist);
mm->core_state = NULL;
@@ -1221,7 +1224,7 @@ struct mm_struct *mm_access(struct task_struct *task, unsigned int mode)
struct mm_struct *mm;
int err;
- err = mutex_lock_killable(&task->signal->exec_update_mutex);
+ err = down_read_killable(&task->signal->exec_update_lock);
if (err)
return ERR_PTR(err);
@@ -1231,7 +1234,7 @@ struct mm_struct *mm_access(struct task_struct *task, unsigned int mode)
mmput(mm);
mm = ERR_PTR(-EACCES);
}
- mutex_unlock(&task->signal->exec_update_mutex);
+ up_read(&task->signal->exec_update_lock);
return mm;
}
@@ -1591,7 +1594,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
sig->oom_score_adj_min = current->signal->oom_score_adj_min;
mutex_init(&sig->cred_guard_mutex);
- mutex_init(&sig->exec_update_mutex);
+ init_rwsem(&sig->exec_update_lock);
return 0;
}
@@ -1625,7 +1628,7 @@ static void copy_seccomp(struct task_struct *p)
* to manually enable the seccomp thread flag here.
*/
if (p->seccomp.mode != SECCOMP_MODE_DISABLED)
- set_tsk_thread_flag(p, TIF_SECCOMP);
+ set_task_syscall_work(p, SECCOMP);
#endif
}
@@ -1650,9 +1653,8 @@ static inline void init_task_pid_links(struct task_struct *task)
{
enum pid_type type;
- for (type = PIDTYPE_PID; type < PIDTYPE_MAX; ++type) {
+ for (type = PIDTYPE_PID; type < PIDTYPE_MAX; ++type)
INIT_HLIST_NODE(&task->pid_links[type]);
- }
}
static inline void
@@ -2158,23 +2160,18 @@ static __latent_entropy struct task_struct *copy_process(
* child regardless of CLONE_PTRACE.
*/
user_disable_single_step(p);
- clear_tsk_thread_flag(p, TIF_SYSCALL_TRACE);
-#ifdef TIF_SYSCALL_EMU
- clear_tsk_thread_flag(p, TIF_SYSCALL_EMU);
+ clear_task_syscall_work(p, SYSCALL_TRACE);
+#if defined(CONFIG_GENERIC_ENTRY) || defined(TIF_SYSCALL_EMU)
+ clear_task_syscall_work(p, SYSCALL_EMU);
#endif
clear_tsk_latency_tracing(p);
/* ok, now we should be set up.. */
p->pid = pid_nr(pid);
if (clone_flags & CLONE_THREAD) {
- p->exit_signal = -1;
p->group_leader = current->group_leader;
p->tgid = current->tgid;
} else {
- if (clone_flags & CLONE_PARENT)
- p->exit_signal = current->group_leader->exit_signal;
- else
- p->exit_signal = args->exit_signal;
p->group_leader = p;
p->tgid = p->pid;
}
@@ -2187,9 +2184,13 @@ static __latent_entropy struct task_struct *copy_process(
INIT_LIST_HEAD(&p->thread_group);
p->task_works = NULL;
+#ifdef CONFIG_KRETPROBES
+ p->kretprobe_instances.first = NULL;
+#endif
+
/*
* Ensure that the cgroup subsystem policies allow the new process to be
- * forked. It should be noted the the new process's css_set can be changed
+ * forked. It should be noted that the new process's css_set can be changed
* between here and cgroup_post_fork() if an organisation operation is in
* progress.
*/
@@ -2218,9 +2219,14 @@ static __latent_entropy struct task_struct *copy_process(
if (clone_flags & (CLONE_PARENT|CLONE_THREAD)) {
p->real_parent = current->real_parent;
p->parent_exec_id = current->parent_exec_id;
+ if (clone_flags & CLONE_THREAD)
+ p->exit_signal = -1;
+ else
+ p->exit_signal = current->group_leader->exit_signal;
} else {
p->real_parent = current;
p->parent_exec_id = current->self_exec_id;
+ p->exit_signal = args->exit_signal;
}
klp_copy_process(p);
@@ -3023,21 +3029,21 @@ SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags)
* the exec layer of the kernel.
*/
-int unshare_files(struct files_struct **displaced)
+int unshare_files(void)
{
struct task_struct *task = current;
- struct files_struct *copy = NULL;
+ struct files_struct *old, *copy = NULL;
int error;
error = unshare_fd(CLONE_FILES, NR_OPEN_MAX, &copy);
- if (error || !copy) {
- *displaced = NULL;
+ if (error || !copy)
return error;
- }
- *displaced = task->files;
+
+ old = task->files;
task_lock(task);
task->files = copy;
task_unlock(task);
+ put_files_struct(old);
return 0;
}
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