stub-data.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3
 4 * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
 5 * Copyright (C) 2005 Jeff Dike (jdike@karaya.com)
 6 */
 7
 8#ifndef __STUB_DATA_H
 9#define __STUB_DATA_H
10
11#include <linux/compiler_types.h>
12#include <as-layout.h>
13#include <sysdep/tls.h>
14#include <sysdep/stub-data.h>
15#include <mm_id.h>
16
17#define FUTEX_IN_CHILD 0
18#define FUTEX_IN_KERN 1
19
20struct stub_init_data {
21	int seccomp;
22
23	unsigned long stub_start;
24
25	int stub_code_fd;
26	unsigned long stub_code_offset;
27	int stub_data_fd;
28	unsigned long stub_data_offset;
29
30	unsigned long signal_handler;
31	unsigned long signal_restorer;
32};
33
34#define STUB_NEXT_SYSCALL(s) \
35	((struct stub_syscall *) (((unsigned long) s) + (s)->cmd_len))
36
37enum stub_syscall_type {
38	STUB_SYSCALL_UNSET = 0,
39	STUB_SYSCALL_MMAP,
40	STUB_SYSCALL_MUNMAP,
41};
42
43struct stub_syscall {
44	struct {
45		unsigned long addr;
46		unsigned long length;
47		unsigned long offset;
48		int fd;
49		int prot;
50	} mem;
51
52	enum stub_syscall_type syscall;
53};
54
55struct stub_data {
56	long err;
57
58	int syscall_data_len;
59	/* 128 leaves enough room for additional fields in the struct */
60	struct stub_syscall syscall_data[(UM_KERN_PAGE_SIZE - 128) / sizeof(struct stub_syscall)] __aligned(16);
61
62	/* data shared with signal handler (only used in seccomp mode) */
63	short restart_wait;
64	unsigned int futex;
65	int signal;
66	unsigned short si_offset;
67	unsigned short mctx_offset;
68
69	/* seccomp architecture specific state restore */
70	struct stub_data_arch arch_data;
71
72	/* Stack for our signal handlers and for calling into . */
73	unsigned char sigstack[UM_KERN_PAGE_SIZE] __aligned(UM_KERN_PAGE_SIZE);
74};
75
76#endif