diff options
Diffstat (limited to 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 73beb8dfa9df..e92b06351dec 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1606,8 +1606,6 @@ static __latent_entropy struct task_struct *copy_process( posix_cpu_timers_init(p); - p->start_time = ktime_get_ns(); - p->real_start_time = ktime_get_boot_ns(); p->io_context = NULL; p->audit_context = NULL; cgroup_fork(p); @@ -1768,6 +1766,17 @@ static __latent_entropy struct task_struct *copy_process( goto bad_fork_free_pid; /* + * From this point on we must avoid any synchronous user-space + * communication until we take the tasklist-lock. In particular, we do + * not want user-space to be able to predict the process start-time by + * stalling fork(2) after we recorded the start_time but before it is + * visible to the system. + */ + + p->start_time = ktime_get_ns(); + p->real_start_time = ktime_get_boot_ns(); + + /* * Make it visible to the rest of the system, but dont wake it up yet. * Need tasklist lock for parent etc handling! */ |