diff options
Diffstat (limited to 'kernel/sys.c')
| -rwxr-xr-x | kernel/sys.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/kernel/sys.c b/kernel/sys.c index f24794e7652..35cda542e8c 100755 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -39,6 +39,7 @@ #include <linux/syscore_ops.h> #include <linux/version.h> #include <linux/ctype.h> +#include <linux/sched.h> #include <linux/compat.h> #include <linux/syscalls.h> @@ -1710,6 +1711,7 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, unsigned long, arg4, unsigned long, arg5) { struct task_struct *me = current; + struct task_struct *tsk; unsigned char comm[sizeof(me->comm)]; long error; @@ -1854,6 +1856,26 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, else error = PR_MCE_KILL_DEFAULT; break; + case PR_SET_TIMERSLACK_PID: + if (current->pid != (pid_t)arg3 && + !capable(CAP_SYS_NICE)) + return -EPERM; + rcu_read_lock(); + tsk = find_task_by_pid_ns((pid_t)arg3, &init_pid_ns); + if (tsk == NULL) { + rcu_read_unlock(); + return -EINVAL; + } + get_task_struct(tsk); + rcu_read_unlock(); + if (arg2 <= 0) + tsk->timer_slack_ns = + tsk->default_timer_slack_ns; + else + tsk->timer_slack_ns = arg2; + put_task_struct(tsk); + error = 0; + break; default: error = -EINVAL; break; |