From 6778948f9de86c3cfaf36725a7c87dcff9ba247f Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 11 Dec 2023 08:20:59 +0000
Subject: [PATCH] kernel_5.10 no rt
---
kernel/arch/um/kernel/skas/syscall.c | 17 +++++++++++++++--
1 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/kernel/arch/um/kernel/skas/syscall.c b/kernel/arch/um/kernel/skas/syscall.c
index b783ac8..3d91f89 100644
--- a/kernel/arch/um/kernel/skas/syscall.c
+++ b/kernel/arch/um/kernel/skas/syscall.c
@@ -1,6 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- * Licensed under the GPL
*/
#include <linux/kernel.h>
@@ -10,11 +10,24 @@
#include <sysdep/ptrace.h>
#include <sysdep/ptrace_user.h>
#include <sysdep/syscalls.h>
+#include <linux/time-internal.h>
+#include <asm/unistd.h>
void handle_syscall(struct uml_pt_regs *r)
{
struct pt_regs *regs = container_of(r, struct pt_regs, regs);
int syscall;
+
+ /*
+ * If we have infinite CPU resources, then make every syscall also a
+ * preemption point, since we don't have any other preemption in this
+ * case, and kernel threads would basically never run until userspace
+ * went to sleep, even if said userspace interacts with the kernel in
+ * various ways.
+ */
+ if (time_travel_mode == TT_MODE_INFCPU ||
+ time_travel_mode == TT_MODE_EXTERNAL)
+ schedule();
/* Initialize the syscall number and default return value. */
UPT_SYSCALL_NR(r) = PT_SYSCALL_NR(r->gp);
@@ -24,7 +37,7 @@
goto out;
/* Do the seccomp check after ptrace; failures should be fast. */
- if (secure_computing(NULL) == -1)
+ if (secure_computing() == -1)
goto out;
syscall = UPT_SYSCALL_NR(r);
--
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