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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/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(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(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 uml_pt_regs *regs, int error_code)
116{
117 /* Send us the fake SIGTRAP */
118 force_sig_fault(SIGTRAP, TRAP_BRKPT,
119 /* User-mode eip? */
120 UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL);
121}
122
123/*
124 * XXX Check PT_DTRACE vs TIF_SINGLESTEP for singlestepping check and
125 * PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check
126 */
127int syscall_trace_enter(struct pt_regs *regs)
128{
129 audit_syscall_entry(UPT_SYSCALL_NR(®s->regs),
130 UPT_SYSCALL_ARG1(®s->regs),
131 UPT_SYSCALL_ARG2(®s->regs),
132 UPT_SYSCALL_ARG3(®s->regs),
133 UPT_SYSCALL_ARG4(®s->regs));
134
135 if (!test_thread_flag(TIF_SYSCALL_TRACE))
136 return 0;
137
138 return tracehook_report_syscall_entry(regs);
139}
140
141void syscall_trace_leave(struct pt_regs *regs)
142{
143 int ptraced = current->ptrace;
144
145 audit_syscall_exit(regs);
146
147 /* Fake a debug trap */
148 if (ptraced & PT_DTRACE)
149 send_sigtrap(®s->regs, 0);
150
151 if (!test_thread_flag(TIF_SYSCALL_TRACE))
152 return;
153
154 tracehook_report_syscall_exit(regs, 0);
155 /* force do_signal() --> is_syscall() */
156 if (ptraced & PT_PTRACED)
157 set_thread_flag(TIF_SIGPENDING);
158}
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}