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1/*
2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
5
6#include <linux/audit.h>
7#include <linux/ptrace.h>
8#include <linux/sched.h>
9#include <linux/tracehook.h>
10#include <linux/uaccess.h>
11#include <asm/ptrace-abi.h>
12
13void user_enable_single_step(struct task_struct *child)
14{
15 child->ptrace |= PT_DTRACE;
16 child->thread.singlestep_syscall = 0;
17
18#ifdef SUBARCH_SET_SINGLESTEPPING
19 SUBARCH_SET_SINGLESTEPPING(child, 1);
20#endif
21}
22
23void user_disable_single_step(struct task_struct *child)
24{
25 child->ptrace &= ~PT_DTRACE;
26 child->thread.singlestep_syscall = 0;
27
28#ifdef SUBARCH_SET_SINGLESTEPPING
29 SUBARCH_SET_SINGLESTEPPING(child, 0);
30#endif
31}
32
33/*
34 * Called by kernel/ptrace.c when detaching..
35 */
36void ptrace_disable(struct task_struct *child)
37{
38 user_disable_single_step(child);
39}
40
41extern int peek_user(struct task_struct * child, long addr, long data);
42extern int poke_user(struct task_struct * child, long addr, long data);
43
44long arch_ptrace(struct task_struct *child, long request,
45 unsigned long addr, unsigned long data)
46{
47 int i, ret;
48 unsigned long __user *p = (void __user *)data;
49 void __user *vp = p;
50
51 switch (request) {
52 /* read the word at location addr in the USER area. */
53 case PTRACE_PEEKUSR:
54 ret = peek_user(child, addr, data);
55 break;
56
57 /* write the word at location addr in the USER area */
58 case PTRACE_POKEUSR:
59 ret = poke_user(child, addr, data);
60 break;
61
62 case PTRACE_SYSEMU:
63 case PTRACE_SYSEMU_SINGLESTEP:
64 ret = -EIO;
65 break;
66
67#ifdef PTRACE_GETREGS
68 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
69 if (!access_ok(VERIFY_WRITE, p, MAX_REG_OFFSET)) {
70 ret = -EIO;
71 break;
72 }
73 for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
74 __put_user(getreg(child, i), p);
75 p++;
76 }
77 ret = 0;
78 break;
79 }
80#endif
81#ifdef PTRACE_SETREGS
82 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
83 unsigned long tmp = 0;
84 if (!access_ok(VERIFY_READ, p, MAX_REG_OFFSET)) {
85 ret = -EIO;
86 break;
87 }
88 for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
89 __get_user(tmp, p);
90 putreg(child, i, tmp);
91 p++;
92 }
93 ret = 0;
94 break;
95 }
96#endif
97 case PTRACE_GET_THREAD_AREA:
98 ret = ptrace_get_thread_area(child, addr, vp);
99 break;
100
101 case PTRACE_SET_THREAD_AREA:
102 ret = ptrace_set_thread_area(child, addr, vp);
103 break;
104
105 default:
106 ret = ptrace_request(child, request, addr, data);
107 if (ret == -EIO)
108 ret = subarch_ptrace(child, request, addr, data);
109 break;
110 }
111
112 return ret;
113}
114
115static void send_sigtrap(struct task_struct *tsk, struct uml_pt_regs *regs,
116 int error_code)
117{
118 struct siginfo info;
119
120 memset(&info, 0, sizeof(info));
121 info.si_signo = SIGTRAP;
122 info.si_code = TRAP_BRKPT;
123
124 /* User-mode eip? */
125 info.si_addr = UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL;
126
127 /* Send us the fake SIGTRAP */
128 force_sig_info(SIGTRAP, &info, tsk);
129}
130
131/*
132 * XXX Check PT_DTRACE vs TIF_SINGLESTEP for singlestepping check and
133 * PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check
134 */
135int syscall_trace_enter(struct pt_regs *regs)
136{
137 audit_syscall_entry(UPT_SYSCALL_NR(®s->regs),
138 UPT_SYSCALL_ARG1(®s->regs),
139 UPT_SYSCALL_ARG2(®s->regs),
140 UPT_SYSCALL_ARG3(®s->regs),
141 UPT_SYSCALL_ARG4(®s->regs));
142
143 if (!test_thread_flag(TIF_SYSCALL_TRACE))
144 return 0;
145
146 return tracehook_report_syscall_entry(regs);
147}
148
149void syscall_trace_leave(struct pt_regs *regs)
150{
151 int ptraced = current->ptrace;
152
153 audit_syscall_exit(regs);
154
155 /* Fake a debug trap */
156 if (ptraced & PT_DTRACE)
157 send_sigtrap(current, ®s->regs, 0);
158
159 if (!test_thread_flag(TIF_SYSCALL_TRACE))
160 return;
161
162 tracehook_report_syscall_exit(regs, 0);
163 /* force do_signal() --> is_syscall() */
164 if (ptraced & PT_PTRACED)
165 set_thread_flag(TIF_SIGPENDING);
166}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4 */
5
6#include <linux/audit.h>
7#include <linux/ptrace.h>
8#include <linux/sched.h>
9#include <linux/uaccess.h>
10#include <asm/ptrace-abi.h>
11
12void user_enable_single_step(struct task_struct *child)
13{
14 set_tsk_thread_flag(child, TIF_SINGLESTEP);
15
16#ifdef SUBARCH_SET_SINGLESTEPPING
17 SUBARCH_SET_SINGLESTEPPING(child, 1);
18#endif
19}
20
21void user_disable_single_step(struct task_struct *child)
22{
23 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
24
25#ifdef SUBARCH_SET_SINGLESTEPPING
26 SUBARCH_SET_SINGLESTEPPING(child, 0);
27#endif
28}
29
30/*
31 * Called by kernel/ptrace.c when detaching..
32 */
33void ptrace_disable(struct task_struct *child)
34{
35 user_disable_single_step(child);
36}
37
38long arch_ptrace(struct task_struct *child, long request,
39 unsigned long addr, unsigned long data)
40{
41 int i, ret;
42 unsigned long __user *p = (void __user *)data;
43 void __user *vp = p;
44
45 switch (request) {
46 /* read the word at location addr in the USER area. */
47 case PTRACE_PEEKUSR:
48 ret = peek_user(child, addr, data);
49 break;
50
51 /* write the word at location addr in the USER area */
52 case PTRACE_POKEUSR:
53 ret = poke_user(child, addr, data);
54 break;
55
56 case PTRACE_SYSEMU:
57 case PTRACE_SYSEMU_SINGLESTEP:
58 ret = -EIO;
59 break;
60
61#ifdef PTRACE_GETREGS
62 case PTRACE_GETREGS: { /* Get all gp regs from the child. */
63 if (!access_ok(p, MAX_REG_OFFSET)) {
64 ret = -EIO;
65 break;
66 }
67 for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
68 __put_user(getreg(child, i), p);
69 p++;
70 }
71 ret = 0;
72 break;
73 }
74#endif
75#ifdef PTRACE_SETREGS
76 case PTRACE_SETREGS: { /* Set all gp regs in the child. */
77 unsigned long tmp = 0;
78 if (!access_ok(p, MAX_REG_OFFSET)) {
79 ret = -EIO;
80 break;
81 }
82 for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) {
83 __get_user(tmp, p);
84 putreg(child, i, tmp);
85 p++;
86 }
87 ret = 0;
88 break;
89 }
90#endif
91 case PTRACE_GET_THREAD_AREA:
92 ret = ptrace_get_thread_area(child, addr, vp);
93 break;
94
95 case PTRACE_SET_THREAD_AREA:
96 ret = ptrace_set_thread_area(child, addr, vp);
97 break;
98
99 default:
100 ret = ptrace_request(child, request, addr, data);
101 if (ret == -EIO)
102 ret = subarch_ptrace(child, request, addr, data);
103 break;
104 }
105
106 return ret;
107}
108
109static void send_sigtrap(struct uml_pt_regs *regs, int error_code)
110{
111 /* Send us the fake SIGTRAP */
112 force_sig_fault(SIGTRAP, TRAP_BRKPT,
113 /* User-mode eip? */
114 UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL);
115}
116
117/*
118 * XXX Check TIF_SINGLESTEP for singlestepping check and
119 * PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check
120 */
121int syscall_trace_enter(struct pt_regs *regs)
122{
123 audit_syscall_entry(UPT_SYSCALL_NR(®s->regs),
124 UPT_SYSCALL_ARG1(®s->regs),
125 UPT_SYSCALL_ARG2(®s->regs),
126 UPT_SYSCALL_ARG3(®s->regs),
127 UPT_SYSCALL_ARG4(®s->regs));
128
129 if (!test_thread_flag(TIF_SYSCALL_TRACE))
130 return 0;
131
132 return ptrace_report_syscall_entry(regs);
133}
134
135void syscall_trace_leave(struct pt_regs *regs)
136{
137 int ptraced = current->ptrace;
138
139 audit_syscall_exit(regs);
140
141 /* Fake a debug trap */
142 if (test_thread_flag(TIF_SINGLESTEP))
143 send_sigtrap(®s->regs, 0);
144
145 if (!test_thread_flag(TIF_SYSCALL_TRACE))
146 return;
147
148 ptrace_report_syscall_exit(regs, 0);
149 /* force do_signal() --> is_syscall() */
150 if (ptraced & PT_PTRACED)
151 set_thread_flag(TIF_SIGPENDING);
152}