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Commit | Line | Data |
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0d1fb0a4 | 1 | // SPDX-License-Identifier: GPL-2.0 |
e32dacb9 | 2 | /* |
ba180fd4 | 3 | * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
e32dacb9 JD |
4 | */ |
5 | ||
37185b33 AV |
6 | #include <linux/kernel.h> |
7 | #include <linux/ptrace.h> | |
c50b4659 | 8 | #include <linux/seccomp.h> |
37185b33 AV |
9 | #include <kern_util.h> |
10 | #include <sysdep/ptrace.h> | |
e04c989e | 11 | #include <sysdep/ptrace_user.h> |
37185b33 | 12 | #include <sysdep/syscalls.h> |
f185063b | 13 | #include <linux/time-internal.h> |
e6da5df0 | 14 | #include <asm/unistd.h> |
e32dacb9 | 15 | |
77bf4400 | 16 | void handle_syscall(struct uml_pt_regs *r) |
e32dacb9 JD |
17 | { |
18 | struct pt_regs *regs = container_of(r, struct pt_regs, regs); | |
e32dacb9 | 19 | int syscall; |
e32dacb9 | 20 | |
06503870 JB |
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 | */ | |
88ce6424 JB |
28 | if (time_travel_mode == TT_MODE_INFCPU || |
29 | time_travel_mode == TT_MODE_EXTERNAL) | |
06503870 JB |
30 | schedule(); |
31 | ||
e04c989e MS |
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 | ||
26703c63 | 36 | if (syscall_trace_enter(regs)) |
972939e2 | 37 | goto out; |
c50b4659 | 38 | |
26703c63 | 39 | /* Do the seccomp check after ptrace; failures should be fast. */ |
fefad9ef | 40 | if (secure_computing() == -1) |
972939e2 | 41 | goto out; |
e32dacb9 | 42 | |
e04c989e | 43 | syscall = UPT_SYSCALL_NR(r); |
e04c989e MS |
44 | if (syscall >= 0 && syscall <= __NR_syscall_max) |
45 | PT_REGS_SET_SYSCALL_RETURN(regs, | |
46 | EXECUTE_SYSCALL(syscall, regs)); | |
e32dacb9 | 47 | |
972939e2 | 48 | out: |
1bfa2317 | 49 | syscall_trace_leave(regs); |
e32dacb9 | 50 | } |