diff options
Diffstat (limited to 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 623259fc794d..11c5c8ab827c 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -79,7 +79,7 @@ #include <asm/pgtable.h> #include <asm/pgalloc.h> -#include <asm/uaccess.h> +#include <linux/uaccess.h> #include <asm/mmu_context.h> #include <asm/cacheflush.h> #include <asm/tlbflush.h> @@ -229,7 +229,7 @@ static inline void free_thread_stack(struct task_struct *tsk) } local_irq_restore(flags); - vfree(tsk->stack); + vfree_atomic(tsk->stack); return; } #endif @@ -315,6 +315,9 @@ static void account_kernel_stack(struct task_struct *tsk, int account) static void release_task_stack(struct task_struct *tsk) { + if (WARN_ON(tsk->state != TASK_DEAD)) + return; /* Better to leak the stack than to free prematurely */ + account_kernel_stack(tsk, -1); arch_release_thread_stack(tsk->stack); free_thread_stack(tsk); @@ -351,6 +354,8 @@ void free_task(struct task_struct *tsk) ftrace_graph_exit_task(tsk); put_seccomp_filter(tsk); arch_release_task_struct(tsk); + if (tsk->flags & PF_KTHREAD) + free_kthread_struct(tsk); free_task_struct(tsk); } EXPORT_SYMBOL(free_task); @@ -742,7 +747,8 @@ static void mm_init_owner(struct mm_struct *mm, struct task_struct *p) #endif } -static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p) +static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p, + struct user_namespace *user_ns) { mm->mmap = NULL; mm->mm_rb = RB_ROOT; @@ -782,6 +788,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p) if (init_new_context(p, mm)) goto fail_nocontext; + mm->user_ns = get_user_ns(user_ns); return mm; fail_nocontext: @@ -827,7 +834,7 @@ struct mm_struct *mm_alloc(void) return NULL; memset(mm, 0, sizeof(*mm)); - return mm_init(mm, current); + return mm_init(mm, current, current_user_ns()); } /* @@ -842,6 +849,7 @@ void __mmdrop(struct mm_struct *mm) destroy_context(mm); mmu_notifier_mm_destroy(mm); check_mm(mm); + put_user_ns(mm->user_ns); free_mm(mm); } EXPORT_SYMBOL_GPL(__mmdrop); @@ -1123,7 +1131,7 @@ static struct mm_struct *dup_mm(struct task_struct *tsk) memcpy(mm, oldmm, sizeof(*mm)); - if (!mm_init(mm, tsk)) + if (!mm_init(mm, tsk, mm->user_ns)) goto fail_nomem; err = dup_mmap(mm, oldmm); @@ -1342,8 +1350,10 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk) seqlock_init(&sig->stats_lock); prev_cputime_init(&sig->prev_cputime); +#ifdef CONFIG_POSIX_TIMERS hrtimer_init(&sig->real_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); sig->real_timer.function = it_real_fn; +#endif task_lock(current->group_leader); memcpy(sig->rlim, current->signal->rlim, sizeof sig->rlim); @@ -1537,7 +1547,7 @@ static __latent_entropy struct task_struct *copy_process( goto bad_fork_cleanup_count; delayacct_tsk_init(p); /* Must remain after dup_task_struct() */ - p->flags &= ~(PF_SUPERPRIV | PF_WQ_WORKER); + p->flags &= ~(PF_SUPERPRIV | PF_WQ_WORKER | PF_IDLE); p->flags |= PF_FORKNOEXEC; INIT_LIST_HEAD(&p->children); INIT_LIST_HEAD(&p->sibling); @@ -1548,7 +1558,9 @@ static __latent_entropy struct task_struct *copy_process( init_sigpending(&p->pending); p->utime = p->stime = p->gtime = 0; +#ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME p->utimescaled = p->stimescaled = 0; +#endif prev_cputime_init(&p->prev_cputime); #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN @@ -1862,6 +1874,7 @@ bad_fork_cleanup_count: atomic_dec(&p->cred->user->processes); exit_creds(p); bad_fork_free: + p->state = TASK_DEAD; put_task_stack(p); free_task(p); fork_out: |