This source file includes following definitions.
- user_enable_single_step
- user_disable_single_step
- ptrace_disable
- arch_ptrace
- send_sigtrap
- syscall_trace_enter
- syscall_trace_leave
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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
13 void 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
23 void 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
35
36 void ptrace_disable(struct task_struct *child)
37 {
38 user_disable_single_step(child);
39 }
40
41 extern int peek_user(struct task_struct * child, long addr, long data);
42 extern int poke_user(struct task_struct * child, long addr, long data);
43
44 long 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
53 case PTRACE_PEEKUSR:
54 ret = peek_user(child, addr, data);
55 break;
56
57
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: {
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: {
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
115 static void send_sigtrap(struct uml_pt_regs *regs, int error_code)
116 {
117
118 force_sig_fault(SIGTRAP, TRAP_BRKPT,
119
120 UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL);
121 }
122
123
124
125
126
127 int 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
141 void syscall_trace_leave(struct pt_regs *regs)
142 {
143 int ptraced = current->ptrace;
144
145 audit_syscall_exit(regs);
146
147
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
156 if (ptraced & PT_PTRACED)
157 set_thread_flag(TIF_SIGPENDING);
158 }