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