diff options
Diffstat (limited to 'kernel/pid.c')
| -rw-r--r-- | kernel/pid.c | 33 |
1 files changed, 32 insertions, 1 deletions
diff --git a/kernel/pid.c b/kernel/pid.c index 8317bcbc7cf7..c45a28c16cd2 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -100,7 +100,7 @@ void put_pid(struct pid *pid) ns = pid->numbers[pid->level].ns; if (refcount_dec_and_test(&pid->count)) { - WARN_ON_ONCE(pid->stashed); + pidfs_free_pid(pid); kmem_cache_free(ns->pid_cachep, pid); put_pid_ns(ns); } @@ -713,6 +713,29 @@ static struct ctl_table_root pid_table_root = { .set_ownership = pid_table_root_set_ownership, }; +static int proc_do_cad_pid(const struct ctl_table *table, int write, void *buffer, + size_t *lenp, loff_t *ppos) +{ + struct pid *new_pid; + pid_t tmp_pid; + int r; + struct ctl_table tmp_table = *table; + + tmp_pid = pid_vnr(cad_pid); + tmp_table.data = &tmp_pid; + + r = proc_dointvec(&tmp_table, write, buffer, lenp, ppos); + if (r || !write) + return r; + + new_pid = find_get_pid(tmp_pid); + if (!new_pid) + return -ESRCH; + + put_pid(xchg(&cad_pid, new_pid)); + return 0; +} + static const struct ctl_table pid_table[] = { { .procname = "pid_max", @@ -723,6 +746,14 @@ static const struct ctl_table pid_table[] = { .extra1 = &pid_max_min, .extra2 = &pid_max_max, }, +#ifdef CONFIG_PROC_SYSCTL + { + .procname = "cad_pid", + .maxlen = sizeof(int), + .mode = 0600, + .proc_handler = proc_do_cad_pid, + }, +#endif }; #endif |