1 // SPDX-License-Identifier: GPL-2.0 1
2 /*
3 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@
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
16 void handle_syscall(struct uml_pt_regs *r)
17 {
18 struct pt_regs *regs = container_of(r,
19 int syscall;
20
21 /*
22 * If we have infinite CPU resources,
23 * preemption point, since we don't ha
24 * case, and kernel threads would basi
25 * went to sleep, even if said userspa
26 * various ways.
27 */
28 if (time_travel_mode == TT_MODE_INFCPU
29 time_travel_mode == TT_MODE_EXTERN
30 schedule();
31
32 /* Initialize the syscall number and d
33 UPT_SYSCALL_NR(r) = PT_SYSCALL_NR(r->g
34 PT_REGS_SET_SYSCALL_RETURN(regs, -ENOS
35
36 if (syscall_trace_enter(regs))
37 goto out;
38
39 /* Do the seccomp check after ptrace;
40 if (secure_computing() == -1)
41 goto out;
42
43 syscall = UPT_SYSCALL_NR(r);
44 if (syscall >= 0 && syscall < __NR_sys
45 PT_REGS_SET_SYSCALL_RETURN(reg
46 EXECUTE_SYSCAL
47
48 out:
49 syscall_trace_leave(regs);
50 }
51
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