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