diff options
Diffstat (limited to 'kernel/sys.c')
| -rw-r--r-- | kernel/sys.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/kernel/sys.c b/kernel/sys.c index a9331f101883..f9bc5c303e3f 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -2261,6 +2261,8 @@ int __weak arch_prctl_spec_ctrl_set(struct task_struct *t, unsigned long which, return -EINVAL; } +#define PR_IO_FLUSHER (PF_MEMALLOC_NOIO | PF_LESS_THROTTLE) + SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, unsigned long, arg4, unsigned long, arg5) { @@ -2488,6 +2490,29 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, return -EINVAL; error = GET_TAGGED_ADDR_CTRL(); break; + case PR_SET_IO_FLUSHER: + if (!capable(CAP_SYS_RESOURCE)) + return -EPERM; + + if (arg3 || arg4 || arg5) + return -EINVAL; + + if (arg2 == 1) + current->flags |= PR_IO_FLUSHER; + else if (!arg2) + current->flags &= ~PR_IO_FLUSHER; + else + return -EINVAL; + break; + case PR_GET_IO_FLUSHER: + if (!capable(CAP_SYS_RESOURCE)) + return -EPERM; + + if (arg2 || arg3 || arg4 || arg5) + return -EINVAL; + + error = (current->flags & PR_IO_FLUSHER) == PR_IO_FLUSHER; + break; default: error = -EINVAL; break; |