1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 
 4 */
 5
 6#include <linux/kernel.h>
 7#include <linux/ptrace.h>
 8#include <linux/seccomp.h>
 9#include <kern_util.h>
10#include <sysdep/ptrace.h>
11#include <sysdep/ptrace_user.h>
12#include <sysdep/syscalls.h>
13#include <linux/time-internal.h>
14#include <asm/unistd.h>
15
16void handle_syscall(struct uml_pt_regs *r)
17{
18	struct pt_regs *regs = container_of(r, struct pt_regs, regs);
19	int syscall;
20
21	/*
22	 * If we have infinite CPU resources, then make every syscall also a
23	 * preemption point, since we don't have any other preemption in this
24	 * case, and kernel threads would basically never run until userspace
25	 * went to sleep, even if said userspace interacts with the kernel in
26	 * various ways.
27	 */
28	if (time_travel_mode == TT_MODE_INFCPU ||
29	    time_travel_mode == TT_MODE_EXTERNAL)
30		schedule();
31
32	/* Initialize the syscall number and default return value. */
33	UPT_SYSCALL_NR(r) = PT_SYSCALL_NR(r->gp);
34	PT_REGS_SET_SYSCALL_RETURN(regs, -ENOSYS);
35
36	if (syscall_trace_enter(regs))
37		goto out;
38
39	/* Do the seccomp check after ptrace; failures should be fast. */
40	if (secure_computing() == -1)
 
 
 
41		goto out;
42
 
 
 
 
43	syscall = UPT_SYSCALL_NR(r);
 
44	if (syscall >= 0 && syscall <= __NR_syscall_max)
45		PT_REGS_SET_SYSCALL_RETURN(regs,
46				EXECUTE_SYSCALL(syscall, regs));
47
48out:
49	syscall_trace_leave(regs);
50}

 
 1/*
 2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 3 * Licensed under the GPL
 4 */
 5
 6#include <linux/kernel.h>
 7#include <linux/ptrace.h>
 8#include <linux/seccomp.h>
 9#include <kern_util.h>
10#include <sysdep/ptrace.h>
11#include <sysdep/ptrace_user.h>
12#include <sysdep/syscalls.h>
 
 
13
14void handle_syscall(struct uml_pt_regs *r)
15{
16	struct pt_regs *regs = container_of(r, struct pt_regs, regs);
17	int syscall;
18
 
 
 
 
 
 
 
 
 
 
 
19	/* Initialize the syscall number and default return value. */
20	UPT_SYSCALL_NR(r) = PT_SYSCALL_NR(r->gp);
21	PT_REGS_SET_SYSCALL_RETURN(regs, -ENOSYS);
22
23	/* Do the secure computing check first; failures should be fast. */
 
 
 
24	if (secure_computing() == -1)
25		return;
26
27	if (syscall_trace_enter(regs))
28		goto out;
29
30	/* Update the syscall number after orig_ax has potentially been updated
31	 * with ptrace.
32	 */
33	UPT_SYSCALL_NR(r) = PT_SYSCALL_NR(r->gp);
34	syscall = UPT_SYSCALL_NR(r);
35
36	if (syscall >= 0 && syscall <= __NR_syscall_max)
37		PT_REGS_SET_SYSCALL_RETURN(regs,
38				EXECUTE_SYSCALL(syscall, regs));
39
40out:
41	syscall_trace_leave(regs);
42}