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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/arch/um/kernel/skas/syscall.c
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@@ -1,6 +1,6 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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- * Licensed under the GPL
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  */
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 #include <linux/kernel.h>
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@@ -10,11 +10,24 @@
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 #include <sysdep/ptrace.h>
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 #include <sysdep/ptrace_user.h>
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 #include <sysdep/syscalls.h>
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+#include <linux/time-internal.h>
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+#include <asm/unistd.h>
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 void handle_syscall(struct uml_pt_regs *r)
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 {
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 	struct pt_regs *regs = container_of(r, struct pt_regs, regs);
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 	int syscall;
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+
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+	/*
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+	 * If we have infinite CPU resources, then make every syscall also a
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+	 * preemption point, since we don't have any other preemption in this
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+	 * case, and kernel threads would basically never run until userspace
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+	 * went to sleep, even if said userspace interacts with the kernel in
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+	 * various ways.
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+	 */
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+	if (time_travel_mode == TT_MODE_INFCPU ||
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+	    time_travel_mode == TT_MODE_EXTERNAL)
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+		schedule();
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 	/* Initialize the syscall number and default return value. */
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 	UPT_SYSCALL_NR(r) = PT_SYSCALL_NR(r->gp);
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@@ -24,7 +37,7 @@
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 		goto out;
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 	/* Do the seccomp check after ptrace; failures should be fast. */
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-	if (secure_computing(NULL) == -1)
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+	if (secure_computing() == -1)
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 		goto out;
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 	syscall = UPT_SYSCALL_NR(r);