Commit | Line | Data |
---|---|---|
ba180fd4 JD |
1 | /* |
2 | * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) | |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
1da177e4 | 6 | #include "linux/audit.h" |
ba180fd4 JD |
7 | #include "linux/ptrace.h" |
8 | #include "linux/sched.h" | |
9 | #include "asm/uaccess.h" | |
1da177e4 | 10 | #ifdef CONFIG_PROC_MM |
ba180fd4 | 11 | #include "proc_mm.h" |
1da177e4 | 12 | #endif |
1da177e4 | 13 | #include "skas_ptrace.h" |
1da177e4 | 14 | |
82c1c11b BS |
15 | static inline void set_singlestepping(struct task_struct *child, int on) |
16 | { | |
ba180fd4 JD |
17 | if (on) |
18 | child->ptrace |= PT_DTRACE; | |
19 | else | |
20 | child->ptrace &= ~PT_DTRACE; | |
21 | child->thread.singlestep_syscall = 0; | |
82c1c11b BS |
22 | |
23 | #ifdef SUBARCH_SET_SINGLESTEPPING | |
ba180fd4 | 24 | SUBARCH_SET_SINGLESTEPPING(child, on); |
82c1c11b | 25 | #endif |
ba9950c8 | 26 | } |
82c1c11b | 27 | |
1da177e4 LT |
28 | /* |
29 | * Called by kernel/ptrace.c when detaching.. | |
30 | */ | |
31 | void ptrace_disable(struct task_struct *child) | |
ba180fd4 JD |
32 | { |
33 | set_singlestepping(child,0); | |
1da177e4 LT |
34 | } |
35 | ||
82c1c11b BS |
36 | extern int peek_user(struct task_struct * child, long addr, long data); |
37 | extern int poke_user(struct task_struct * child, long addr, long data); | |
38 | ||
481bed45 | 39 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 40 | { |
1da177e4 | 41 | int i, ret; |
4d338e1a | 42 | unsigned long __user *p = (void __user *)(unsigned long)data; |
1da177e4 | 43 | |
1da177e4 | 44 | switch (request) { |
ba180fd4 JD |
45 | /* read word at location addr. */ |
46 | case PTRACE_PEEKTEXT: | |
76647323 AD |
47 | case PTRACE_PEEKDATA: |
48 | ret = generic_ptrace_peekdata(child, addr, data); | |
1da177e4 | 49 | break; |
1da177e4 LT |
50 | |
51 | /* read the word at location addr in the USER area. */ | |
ba180fd4 JD |
52 | case PTRACE_PEEKUSR: |
53 | ret = peek_user(child, addr, data); | |
54 | break; | |
1da177e4 | 55 | |
ba180fd4 JD |
56 | /* write the word at location addr. */ |
57 | case PTRACE_POKETEXT: | |
1da177e4 | 58 | case PTRACE_POKEDATA: |
f284ce72 | 59 | ret = generic_ptrace_pokedata(child, addr, data); |
1da177e4 LT |
60 | break; |
61 | ||
ba180fd4 JD |
62 | /* write the word at location addr in the USER area */ |
63 | case PTRACE_POKEUSR: | |
64 | ret = poke_user(child, addr, data); | |
65 | break; | |
1da177e4 | 66 | |
86d6f2bf RD |
67 | case PTRACE_SYSEMU: |
68 | case PTRACE_SYSEMU_SINGLESTEP: | |
69 | ret = -EIO; | |
70 | break; | |
71 | ||
ba180fd4 JD |
72 | /* continue and stop at next (return from) syscall */ |
73 | case PTRACE_SYSCALL: | |
74 | /* restart after signal. */ | |
75 | case PTRACE_CONT: { | |
1da177e4 | 76 | ret = -EIO; |
7ed20e1a | 77 | if (!valid_signal(data)) |
1da177e4 LT |
78 | break; |
79 | ||
ba180fd4 JD |
80 | set_singlestepping(child, 0); |
81 | if (request == PTRACE_SYSCALL) | |
1da177e4 | 82 | set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); |
ba180fd4 | 83 | else clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); |
1da177e4 LT |
84 | child->exit_code = data; |
85 | wake_up_process(child); | |
86 | ret = 0; | |
87 | break; | |
88 | } | |
89 | ||
90 | /* | |
ba180fd4 JD |
91 | * make the child exit. Best I can do is send it a sigkill. |
92 | * perhaps it should be put in the status that it wants to | |
1da177e4 LT |
93 | * exit. |
94 | */ | |
95 | case PTRACE_KILL: { | |
96 | ret = 0; | |
97 | if (child->exit_state == EXIT_ZOMBIE) /* already dead */ | |
98 | break; | |
99 | ||
ba180fd4 | 100 | set_singlestepping(child, 0); |
1da177e4 LT |
101 | child->exit_code = SIGKILL; |
102 | wake_up_process(child); | |
103 | break; | |
104 | } | |
105 | ||
106 | case PTRACE_SINGLESTEP: { /* set the trap flag. */ | |
107 | ret = -EIO; | |
7ed20e1a | 108 | if (!valid_signal(data)) |
1da177e4 LT |
109 | break; |
110 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
ba180fd4 | 111 | set_singlestepping(child, 1); |
1da177e4 LT |
112 | child->exit_code = data; |
113 | /* give it a chance to run. */ | |
114 | wake_up_process(child); | |
115 | ret = 0; | |
116 | break; | |
117 | } | |
118 | ||
1da177e4 LT |
119 | #ifdef PTRACE_GETREGS |
120 | case PTRACE_GETREGS: { /* Get all gp regs from the child. */ | |
4d338e1a | 121 | if (!access_ok(VERIFY_WRITE, p, MAX_REG_OFFSET)) { |
1da177e4 LT |
122 | ret = -EIO; |
123 | break; | |
124 | } | |
125 | for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) { | |
4d338e1a AV |
126 | __put_user(getreg(child, i), p); |
127 | p++; | |
1da177e4 LT |
128 | } |
129 | ret = 0; | |
130 | break; | |
131 | } | |
132 | #endif | |
133 | #ifdef PTRACE_SETREGS | |
134 | case PTRACE_SETREGS: { /* Set all gp regs in the child. */ | |
135 | unsigned long tmp = 0; | |
4d338e1a | 136 | if (!access_ok(VERIFY_READ, p, MAX_REG_OFFSET)) { |
1da177e4 LT |
137 | ret = -EIO; |
138 | break; | |
139 | } | |
140 | for ( i = 0; i < MAX_REG_OFFSET; i += sizeof(long) ) { | |
4d338e1a | 141 | __get_user(tmp, p); |
1da177e4 | 142 | putreg(child, i, tmp); |
4d338e1a | 143 | p++; |
1da177e4 LT |
144 | } |
145 | ret = 0; | |
146 | break; | |
147 | } | |
148 | #endif | |
149 | #ifdef PTRACE_GETFPREGS | |
150 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
e8012b58 JD |
151 | ret = get_fpregs((struct user_i387_struct __user *) data, |
152 | child); | |
1da177e4 LT |
153 | break; |
154 | #endif | |
155 | #ifdef PTRACE_SETFPREGS | |
156 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
e8012b58 JD |
157 | ret = set_fpregs((struct user_i387_struct __user *) data, |
158 | child); | |
1da177e4 LT |
159 | break; |
160 | #endif | |
aa6758d4 PBG |
161 | case PTRACE_GET_THREAD_AREA: |
162 | ret = ptrace_get_thread_area(child, addr, | |
163 | (struct user_desc __user *) data); | |
164 | break; | |
165 | ||
166 | case PTRACE_SET_THREAD_AREA: | |
167 | ret = ptrace_set_thread_area(child, addr, | |
168 | (struct user_desc __user *) data); | |
169 | break; | |
170 | ||
1da177e4 | 171 | case PTRACE_FAULTINFO: { |
ba180fd4 JD |
172 | /* |
173 | * Take the info from thread->arch->faultinfo, | |
4d338e1a AV |
174 | * but transfer max. sizeof(struct ptrace_faultinfo). |
175 | * On i386, ptrace_faultinfo is smaller! | |
176 | */ | |
177 | ret = copy_to_user(p, &child->thread.arch.faultinfo, | |
178 | sizeof(struct ptrace_faultinfo)); | |
1da177e4 LT |
179 | break; |
180 | } | |
1da177e4 | 181 | |
c578455a | 182 | #ifdef PTRACE_LDT |
1da177e4 LT |
183 | case PTRACE_LDT: { |
184 | struct ptrace_ldt ldt; | |
185 | ||
ba180fd4 | 186 | if (copy_from_user(&ldt, p, sizeof(ldt))) { |
1da177e4 LT |
187 | ret = -EIO; |
188 | break; | |
189 | } | |
190 | ||
ba180fd4 JD |
191 | /* |
192 | * This one is confusing, so just punt and return -EIO for | |
1da177e4 LT |
193 | * now |
194 | */ | |
195 | ret = -EIO; | |
196 | break; | |
197 | } | |
c578455a | 198 | #endif |
1da177e4 LT |
199 | #ifdef CONFIG_PROC_MM |
200 | case PTRACE_SWITCH_MM: { | |
201 | struct mm_struct *old = child->mm; | |
202 | struct mm_struct *new = proc_mm_get_mm(data); | |
203 | ||
ba180fd4 | 204 | if (IS_ERR(new)) { |
1da177e4 LT |
205 | ret = PTR_ERR(new); |
206 | break; | |
207 | } | |
208 | ||
209 | atomic_inc(&new->mm_users); | |
210 | child->mm = new; | |
211 | child->active_mm = new; | |
212 | mmput(old); | |
213 | ret = 0; | |
214 | break; | |
215 | } | |
6e6d74cf JD |
216 | #endif |
217 | #ifdef PTRACE_ARCH_PRCTL | |
ba180fd4 JD |
218 | case PTRACE_ARCH_PRCTL: |
219 | /* XXX Calls ptrace on the host - needs some SMP thinking */ | |
220 | ret = arch_prctl(child, data, (void *) addr); | |
221 | break; | |
1da177e4 LT |
222 | #endif |
223 | default: | |
224 | ret = ptrace_request(child, request, addr, data); | |
e8012b58 JD |
225 | if (ret == -EIO) |
226 | ret = subarch_ptrace(child, request, addr, data); | |
1da177e4 LT |
227 | break; |
228 | } | |
481bed45 | 229 | |
1da177e4 LT |
230 | return ret; |
231 | } | |
232 | ||
99764fa4 | 233 | static void send_sigtrap(struct task_struct *tsk, struct uml_pt_regs *regs, |
1da177e4 LT |
234 | int error_code) |
235 | { | |
236 | struct siginfo info; | |
237 | ||
238 | memset(&info, 0, sizeof(info)); | |
239 | info.si_signo = SIGTRAP; | |
240 | info.si_code = TRAP_BRKPT; | |
241 | ||
242 | /* User-mode eip? */ | |
243 | info.si_addr = UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL; | |
244 | ||
b60745b9 | 245 | /* Send us the fake SIGTRAP */ |
1da177e4 LT |
246 | force_sig_info(SIGTRAP, &info, tsk); |
247 | } | |
248 | ||
ba180fd4 JD |
249 | /* |
250 | * XXX Check PT_DTRACE vs TIF_SINGLESTEP for singlestepping check and | |
1da177e4 LT |
251 | * PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check |
252 | */ | |
77bf4400 | 253 | void syscall_trace(struct uml_pt_regs *regs, int entryexit) |
1da177e4 LT |
254 | { |
255 | int is_singlestep = (current->ptrace & PT_DTRACE) && entryexit; | |
256 | int tracesysgood; | |
257 | ||
258 | if (unlikely(current->audit_context)) { | |
259 | if (!entryexit) | |
5411be59 | 260 | audit_syscall_entry(HOST_AUDIT_ARCH, |
79d20b14 JD |
261 | UPT_SYSCALL_NR(regs), |
262 | UPT_SYSCALL_ARG1(regs), | |
263 | UPT_SYSCALL_ARG2(regs), | |
264 | UPT_SYSCALL_ARG3(regs), | |
265 | UPT_SYSCALL_ARG4(regs)); | |
5411be59 | 266 | else audit_syscall_exit(AUDITSC_RESULT(UPT_SYSCALL_RET(regs)), |
ba180fd4 | 267 | UPT_SYSCALL_RET(regs)); |
1da177e4 LT |
268 | } |
269 | ||
270 | /* Fake a debug trap */ | |
271 | if (is_singlestep) | |
272 | send_sigtrap(current, regs, 0); | |
273 | ||
274 | if (!test_thread_flag(TIF_SYSCALL_TRACE)) | |
275 | return; | |
276 | ||
277 | if (!(current->ptrace & PT_PTRACED)) | |
278 | return; | |
279 | ||
ba180fd4 JD |
280 | /* |
281 | * the 0x80 provides a way for the tracing parent to distinguish | |
282 | * between a syscall stop and SIGTRAP delivery | |
283 | */ | |
1da177e4 LT |
284 | tracesysgood = (current->ptrace & PT_TRACESYSGOOD); |
285 | ptrace_notify(SIGTRAP | (tracesysgood ? 0x80 : 0)); | |
286 | ||
287 | if (entryexit) /* force do_signal() --> is_syscall() */ | |
288 | set_thread_flag(TIF_SIGPENDING); | |
289 | ||
ba180fd4 JD |
290 | /* |
291 | * this isn't the same as continuing with a signal, but it will do | |
1da177e4 LT |
292 | * for normal use. strace only continues with a signal if the |
293 | * stopping signal is not SIGTRAP. -brl | |
294 | */ | |
295 | if (current->exit_code) { | |
296 | send_sig(current->exit_code, current, 1); | |
297 | current->exit_code = 0; | |
298 | } | |
299 | } |