Cregit: Linux 5.2: syscall.c

Contributors: 7
Author	Tokens	Token Proportion	Commits	Commit Proportion
Jeff Dike	58	44.27%	4	28.57%
Mickaël Salaün	48	36.64%	3	21.43%
Kees Cook	8	6.11%	1	7.14%
Al Viro	6	4.58%	2	14.29%
Richard Weinberger	5	3.82%	2	14.29%
Paolo 'Blaisorblade' Giarrusso	4	3.05%	1	7.14%
Andrew Lutomirski	2	1.53%	1	7.14%
Total	131		14

/*
 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include <linux/kernel.h>
#include <linux/ptrace.h>
#include <linux/seccomp.h>
#include <kern_util.h>
#include <sysdep/ptrace.h>
#include <sysdep/ptrace_user.h>
#include <sysdep/syscalls.h>

void handle_syscall(struct uml_pt_regs *r)
{
	struct pt_regs *regs = container_of(r, struct pt_regs, regs);
	int syscall;

	/* Initialize the syscall number and default return value. */
	UPT_SYSCALL_NR(r) = PT_SYSCALL_NR(r->gp);
	PT_REGS_SET_SYSCALL_RETURN(regs, -ENOSYS);

	if (syscall_trace_enter(regs))
		goto out;

	/* Do the seccomp check after ptrace; failures should be fast. */
	if (secure_computing(NULL) == -1)
		goto out;

	syscall = UPT_SYSCALL_NR(r);
	if (syscall >= 0 && syscall <= __NR_syscall_max)
		PT_REGS_SET_SYSCALL_RETURN(regs,
				EXECUTE_SYSCALL(syscall, regs));

out:
	syscall_trace_leave(regs);
}