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1da177e4 LT |
1 | /* |
2 | * linux/fs/proc/base.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * proc base directory handling functions | |
7 | * | |
8 | * 1999, Al Viro. Rewritten. Now it covers the whole per-process part. | |
9 | * Instead of using magical inumbers to determine the kind of object | |
10 | * we allocate and fill in-core inodes upon lookup. They don't even | |
11 | * go into icache. We cache the reference to task_struct upon lookup too. | |
12 | * Eventually it should become a filesystem in its own. We don't use the | |
13 | * rest of procfs anymore. | |
e070ad49 ML |
14 | * |
15 | * | |
16 | * Changelog: | |
17 | * 17-Jan-2005 | |
18 | * Allan Bezerra | |
19 | * Bruna Moreira <bruna.moreira@indt.org.br> | |
20 | * Edjard Mota <edjard.mota@indt.org.br> | |
21 | * Ilias Biris <ilias.biris@indt.org.br> | |
22 | * Mauricio Lin <mauricio.lin@indt.org.br> | |
23 | * | |
24 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
25 | * | |
26 | * A new process specific entry (smaps) included in /proc. It shows the | |
27 | * size of rss for each memory area. The maps entry lacks information | |
28 | * about physical memory size (rss) for each mapped file, i.e., | |
29 | * rss information for executables and library files. | |
30 | * This additional information is useful for any tools that need to know | |
31 | * about physical memory consumption for a process specific library. | |
32 | * | |
33 | * Changelog: | |
34 | * 21-Feb-2005 | |
35 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
36 | * Pud inclusion in the page table walking. | |
37 | * | |
38 | * ChangeLog: | |
39 | * 10-Mar-2005 | |
40 | * 10LE Instituto Nokia de Tecnologia - INdT: | |
41 | * A better way to walks through the page table as suggested by Hugh Dickins. | |
42 | * | |
43 | * Simo Piiroinen <simo.piiroinen@nokia.com>: | |
44 | * Smaps information related to shared, private, clean and dirty pages. | |
45 | * | |
46 | * Paul Mundt <paul.mundt@nokia.com>: | |
47 | * Overall revision about smaps. | |
1da177e4 LT |
48 | */ |
49 | ||
50 | #include <asm/uaccess.h> | |
51 | ||
52 | #include <linux/config.h> | |
53 | #include <linux/errno.h> | |
54 | #include <linux/time.h> | |
55 | #include <linux/proc_fs.h> | |
56 | #include <linux/stat.h> | |
57 | #include <linux/init.h> | |
58 | #include <linux/file.h> | |
59 | #include <linux/string.h> | |
60 | #include <linux/seq_file.h> | |
61 | #include <linux/namei.h> | |
62 | #include <linux/namespace.h> | |
63 | #include <linux/mm.h> | |
64 | #include <linux/smp_lock.h> | |
65 | #include <linux/kallsyms.h> | |
66 | #include <linux/mount.h> | |
67 | #include <linux/security.h> | |
68 | #include <linux/ptrace.h> | |
69 | #include <linux/seccomp.h> | |
70 | #include <linux/cpuset.h> | |
71 | #include <linux/audit.h> | |
72 | #include "internal.h" | |
73 | ||
74 | /* | |
75 | * For hysterical raisins we keep the same inumbers as in the old procfs. | |
76 | * Feel free to change the macro below - just keep the range distinct from | |
77 | * inumbers of the rest of procfs (currently those are in 0x0000--0xffff). | |
78 | * As soon as we'll get a separate superblock we will be able to forget | |
79 | * about magical ranges too. | |
80 | */ | |
81 | ||
82 | #define fake_ino(pid,ino) (((pid)<<16)|(ino)) | |
83 | ||
84 | enum pid_directory_inos { | |
85 | PROC_TGID_INO = 2, | |
86 | PROC_TGID_TASK, | |
87 | PROC_TGID_STATUS, | |
88 | PROC_TGID_MEM, | |
89 | #ifdef CONFIG_SECCOMP | |
90 | PROC_TGID_SECCOMP, | |
91 | #endif | |
92 | PROC_TGID_CWD, | |
93 | PROC_TGID_ROOT, | |
94 | PROC_TGID_EXE, | |
95 | PROC_TGID_FD, | |
96 | PROC_TGID_ENVIRON, | |
97 | PROC_TGID_AUXV, | |
98 | PROC_TGID_CMDLINE, | |
99 | PROC_TGID_STAT, | |
100 | PROC_TGID_STATM, | |
101 | PROC_TGID_MAPS, | |
6e21c8f1 | 102 | PROC_TGID_NUMA_MAPS, |
1da177e4 LT |
103 | PROC_TGID_MOUNTS, |
104 | PROC_TGID_WCHAN, | |
e070ad49 | 105 | PROC_TGID_SMAPS, |
1da177e4 LT |
106 | #ifdef CONFIG_SCHEDSTATS |
107 | PROC_TGID_SCHEDSTAT, | |
108 | #endif | |
109 | #ifdef CONFIG_CPUSETS | |
110 | PROC_TGID_CPUSET, | |
111 | #endif | |
112 | #ifdef CONFIG_SECURITY | |
113 | PROC_TGID_ATTR, | |
114 | PROC_TGID_ATTR_CURRENT, | |
115 | PROC_TGID_ATTR_PREV, | |
116 | PROC_TGID_ATTR_EXEC, | |
117 | PROC_TGID_ATTR_FSCREATE, | |
118 | #endif | |
119 | #ifdef CONFIG_AUDITSYSCALL | |
120 | PROC_TGID_LOGINUID, | |
121 | #endif | |
122 | PROC_TGID_FD_DIR, | |
123 | PROC_TGID_OOM_SCORE, | |
124 | PROC_TGID_OOM_ADJUST, | |
125 | PROC_TID_INO, | |
126 | PROC_TID_STATUS, | |
127 | PROC_TID_MEM, | |
128 | #ifdef CONFIG_SECCOMP | |
129 | PROC_TID_SECCOMP, | |
130 | #endif | |
131 | PROC_TID_CWD, | |
132 | PROC_TID_ROOT, | |
133 | PROC_TID_EXE, | |
134 | PROC_TID_FD, | |
135 | PROC_TID_ENVIRON, | |
136 | PROC_TID_AUXV, | |
137 | PROC_TID_CMDLINE, | |
138 | PROC_TID_STAT, | |
139 | PROC_TID_STATM, | |
140 | PROC_TID_MAPS, | |
6e21c8f1 | 141 | PROC_TID_NUMA_MAPS, |
1da177e4 LT |
142 | PROC_TID_MOUNTS, |
143 | PROC_TID_WCHAN, | |
e070ad49 | 144 | PROC_TID_SMAPS, |
1da177e4 LT |
145 | #ifdef CONFIG_SCHEDSTATS |
146 | PROC_TID_SCHEDSTAT, | |
147 | #endif | |
148 | #ifdef CONFIG_CPUSETS | |
149 | PROC_TID_CPUSET, | |
150 | #endif | |
151 | #ifdef CONFIG_SECURITY | |
152 | PROC_TID_ATTR, | |
153 | PROC_TID_ATTR_CURRENT, | |
154 | PROC_TID_ATTR_PREV, | |
155 | PROC_TID_ATTR_EXEC, | |
156 | PROC_TID_ATTR_FSCREATE, | |
157 | #endif | |
158 | #ifdef CONFIG_AUDITSYSCALL | |
159 | PROC_TID_LOGINUID, | |
160 | #endif | |
161 | PROC_TID_FD_DIR = 0x8000, /* 0x8000-0xffff */ | |
162 | PROC_TID_OOM_SCORE, | |
163 | PROC_TID_OOM_ADJUST, | |
164 | }; | |
165 | ||
166 | struct pid_entry { | |
167 | int type; | |
168 | int len; | |
169 | char *name; | |
170 | mode_t mode; | |
171 | }; | |
172 | ||
173 | #define E(type,name,mode) {(type),sizeof(name)-1,(name),(mode)} | |
174 | ||
175 | static struct pid_entry tgid_base_stuff[] = { | |
176 | E(PROC_TGID_TASK, "task", S_IFDIR|S_IRUGO|S_IXUGO), | |
177 | E(PROC_TGID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR), | |
178 | E(PROC_TGID_ENVIRON, "environ", S_IFREG|S_IRUSR), | |
179 | E(PROC_TGID_AUXV, "auxv", S_IFREG|S_IRUSR), | |
180 | E(PROC_TGID_STATUS, "status", S_IFREG|S_IRUGO), | |
181 | E(PROC_TGID_CMDLINE, "cmdline", S_IFREG|S_IRUGO), | |
182 | E(PROC_TGID_STAT, "stat", S_IFREG|S_IRUGO), | |
183 | E(PROC_TGID_STATM, "statm", S_IFREG|S_IRUGO), | |
184 | E(PROC_TGID_MAPS, "maps", S_IFREG|S_IRUGO), | |
6e21c8f1 CL |
185 | #ifdef CONFIG_NUMA |
186 | E(PROC_TGID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO), | |
187 | #endif | |
1da177e4 LT |
188 | E(PROC_TGID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR), |
189 | #ifdef CONFIG_SECCOMP | |
190 | E(PROC_TGID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR), | |
191 | #endif | |
192 | E(PROC_TGID_CWD, "cwd", S_IFLNK|S_IRWXUGO), | |
193 | E(PROC_TGID_ROOT, "root", S_IFLNK|S_IRWXUGO), | |
194 | E(PROC_TGID_EXE, "exe", S_IFLNK|S_IRWXUGO), | |
195 | E(PROC_TGID_MOUNTS, "mounts", S_IFREG|S_IRUGO), | |
e070ad49 | 196 | E(PROC_TGID_SMAPS, "smaps", S_IFREG|S_IRUGO), |
1da177e4 LT |
197 | #ifdef CONFIG_SECURITY |
198 | E(PROC_TGID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO), | |
199 | #endif | |
200 | #ifdef CONFIG_KALLSYMS | |
201 | E(PROC_TGID_WCHAN, "wchan", S_IFREG|S_IRUGO), | |
202 | #endif | |
203 | #ifdef CONFIG_SCHEDSTATS | |
204 | E(PROC_TGID_SCHEDSTAT, "schedstat", S_IFREG|S_IRUGO), | |
205 | #endif | |
206 | #ifdef CONFIG_CPUSETS | |
207 | E(PROC_TGID_CPUSET, "cpuset", S_IFREG|S_IRUGO), | |
208 | #endif | |
209 | E(PROC_TGID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO), | |
210 | E(PROC_TGID_OOM_ADJUST,"oom_adj", S_IFREG|S_IRUGO|S_IWUSR), | |
211 | #ifdef CONFIG_AUDITSYSCALL | |
212 | E(PROC_TGID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO), | |
213 | #endif | |
214 | {0,0,NULL,0} | |
215 | }; | |
216 | static struct pid_entry tid_base_stuff[] = { | |
217 | E(PROC_TID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR), | |
218 | E(PROC_TID_ENVIRON, "environ", S_IFREG|S_IRUSR), | |
219 | E(PROC_TID_AUXV, "auxv", S_IFREG|S_IRUSR), | |
220 | E(PROC_TID_STATUS, "status", S_IFREG|S_IRUGO), | |
221 | E(PROC_TID_CMDLINE, "cmdline", S_IFREG|S_IRUGO), | |
222 | E(PROC_TID_STAT, "stat", S_IFREG|S_IRUGO), | |
223 | E(PROC_TID_STATM, "statm", S_IFREG|S_IRUGO), | |
224 | E(PROC_TID_MAPS, "maps", S_IFREG|S_IRUGO), | |
6e21c8f1 CL |
225 | #ifdef CONFIG_NUMA |
226 | E(PROC_TID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO), | |
227 | #endif | |
1da177e4 LT |
228 | E(PROC_TID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR), |
229 | #ifdef CONFIG_SECCOMP | |
230 | E(PROC_TID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR), | |
231 | #endif | |
232 | E(PROC_TID_CWD, "cwd", S_IFLNK|S_IRWXUGO), | |
233 | E(PROC_TID_ROOT, "root", S_IFLNK|S_IRWXUGO), | |
234 | E(PROC_TID_EXE, "exe", S_IFLNK|S_IRWXUGO), | |
235 | E(PROC_TID_MOUNTS, "mounts", S_IFREG|S_IRUGO), | |
e070ad49 | 236 | E(PROC_TID_SMAPS, "smaps", S_IFREG|S_IRUGO), |
1da177e4 LT |
237 | #ifdef CONFIG_SECURITY |
238 | E(PROC_TID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO), | |
239 | #endif | |
240 | #ifdef CONFIG_KALLSYMS | |
241 | E(PROC_TID_WCHAN, "wchan", S_IFREG|S_IRUGO), | |
242 | #endif | |
243 | #ifdef CONFIG_SCHEDSTATS | |
244 | E(PROC_TID_SCHEDSTAT, "schedstat",S_IFREG|S_IRUGO), | |
245 | #endif | |
246 | #ifdef CONFIG_CPUSETS | |
247 | E(PROC_TID_CPUSET, "cpuset", S_IFREG|S_IRUGO), | |
248 | #endif | |
249 | E(PROC_TID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO), | |
250 | E(PROC_TID_OOM_ADJUST, "oom_adj", S_IFREG|S_IRUGO|S_IWUSR), | |
251 | #ifdef CONFIG_AUDITSYSCALL | |
252 | E(PROC_TID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO), | |
253 | #endif | |
254 | {0,0,NULL,0} | |
255 | }; | |
256 | ||
257 | #ifdef CONFIG_SECURITY | |
258 | static struct pid_entry tgid_attr_stuff[] = { | |
259 | E(PROC_TGID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO), | |
260 | E(PROC_TGID_ATTR_PREV, "prev", S_IFREG|S_IRUGO), | |
261 | E(PROC_TGID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO), | |
262 | E(PROC_TGID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO), | |
263 | {0,0,NULL,0} | |
264 | }; | |
265 | static struct pid_entry tid_attr_stuff[] = { | |
266 | E(PROC_TID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO), | |
267 | E(PROC_TID_ATTR_PREV, "prev", S_IFREG|S_IRUGO), | |
268 | E(PROC_TID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO), | |
269 | E(PROC_TID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO), | |
270 | {0,0,NULL,0} | |
271 | }; | |
272 | #endif | |
273 | ||
274 | #undef E | |
275 | ||
276 | static int proc_fd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) | |
277 | { | |
278 | struct task_struct *task = proc_task(inode); | |
279 | struct files_struct *files; | |
280 | struct file *file; | |
281 | int fd = proc_type(inode) - PROC_TID_FD_DIR; | |
282 | ||
283 | files = get_files_struct(task); | |
284 | if (files) { | |
285 | spin_lock(&files->file_lock); | |
286 | file = fcheck_files(files, fd); | |
287 | if (file) { | |
288 | *mnt = mntget(file->f_vfsmnt); | |
289 | *dentry = dget(file->f_dentry); | |
290 | spin_unlock(&files->file_lock); | |
291 | put_files_struct(files); | |
292 | return 0; | |
293 | } | |
294 | spin_unlock(&files->file_lock); | |
295 | put_files_struct(files); | |
296 | } | |
297 | return -ENOENT; | |
298 | } | |
299 | ||
300 | static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) | |
301 | { | |
302 | struct fs_struct *fs; | |
303 | int result = -ENOENT; | |
304 | task_lock(proc_task(inode)); | |
305 | fs = proc_task(inode)->fs; | |
306 | if(fs) | |
307 | atomic_inc(&fs->count); | |
308 | task_unlock(proc_task(inode)); | |
309 | if (fs) { | |
310 | read_lock(&fs->lock); | |
311 | *mnt = mntget(fs->pwdmnt); | |
312 | *dentry = dget(fs->pwd); | |
313 | read_unlock(&fs->lock); | |
314 | result = 0; | |
315 | put_fs_struct(fs); | |
316 | } | |
317 | return result; | |
318 | } | |
319 | ||
320 | static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) | |
321 | { | |
322 | struct fs_struct *fs; | |
323 | int result = -ENOENT; | |
324 | task_lock(proc_task(inode)); | |
325 | fs = proc_task(inode)->fs; | |
326 | if(fs) | |
327 | atomic_inc(&fs->count); | |
328 | task_unlock(proc_task(inode)); | |
329 | if (fs) { | |
330 | read_lock(&fs->lock); | |
331 | *mnt = mntget(fs->rootmnt); | |
332 | *dentry = dget(fs->root); | |
333 | read_unlock(&fs->lock); | |
334 | result = 0; | |
335 | put_fs_struct(fs); | |
336 | } | |
337 | return result; | |
338 | } | |
339 | ||
340 | #define MAY_PTRACE(task) \ | |
341 | (task == current || \ | |
342 | (task->parent == current && \ | |
343 | (task->ptrace & PT_PTRACED) && \ | |
344 | (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \ | |
345 | security_ptrace(current,task) == 0)) | |
346 | ||
347 | static int may_ptrace_attach(struct task_struct *task) | |
348 | { | |
349 | int retval = 0; | |
350 | ||
351 | task_lock(task); | |
352 | ||
353 | if (!task->mm) | |
354 | goto out; | |
355 | if (((current->uid != task->euid) || | |
356 | (current->uid != task->suid) || | |
357 | (current->uid != task->uid) || | |
358 | (current->gid != task->egid) || | |
359 | (current->gid != task->sgid) || | |
360 | (current->gid != task->gid)) && !capable(CAP_SYS_PTRACE)) | |
361 | goto out; | |
362 | rmb(); | |
d6e71144 | 363 | if (task->mm->dumpable != 1 && !capable(CAP_SYS_PTRACE)) |
1da177e4 LT |
364 | goto out; |
365 | if (security_ptrace(current, task)) | |
366 | goto out; | |
367 | ||
368 | retval = 1; | |
369 | out: | |
370 | task_unlock(task); | |
371 | return retval; | |
372 | } | |
373 | ||
374 | static int proc_pid_environ(struct task_struct *task, char * buffer) | |
375 | { | |
376 | int res = 0; | |
377 | struct mm_struct *mm = get_task_mm(task); | |
378 | if (mm) { | |
379 | unsigned int len = mm->env_end - mm->env_start; | |
380 | if (len > PAGE_SIZE) | |
381 | len = PAGE_SIZE; | |
382 | res = access_process_vm(task, mm->env_start, buffer, len, 0); | |
383 | if (!may_ptrace_attach(task)) | |
384 | res = -ESRCH; | |
385 | mmput(mm); | |
386 | } | |
387 | return res; | |
388 | } | |
389 | ||
390 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) | |
391 | { | |
392 | int res = 0; | |
393 | unsigned int len; | |
394 | struct mm_struct *mm = get_task_mm(task); | |
395 | if (!mm) | |
396 | goto out; | |
397 | if (!mm->arg_end) | |
398 | goto out_mm; /* Shh! No looking before we're done */ | |
399 | ||
400 | len = mm->arg_end - mm->arg_start; | |
401 | ||
402 | if (len > PAGE_SIZE) | |
403 | len = PAGE_SIZE; | |
404 | ||
405 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); | |
406 | ||
407 | // If the nul at the end of args has been overwritten, then | |
408 | // assume application is using setproctitle(3). | |
409 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { | |
410 | len = strnlen(buffer, res); | |
411 | if (len < res) { | |
412 | res = len; | |
413 | } else { | |
414 | len = mm->env_end - mm->env_start; | |
415 | if (len > PAGE_SIZE - res) | |
416 | len = PAGE_SIZE - res; | |
417 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); | |
418 | res = strnlen(buffer, res); | |
419 | } | |
420 | } | |
421 | out_mm: | |
422 | mmput(mm); | |
423 | out: | |
424 | return res; | |
425 | } | |
426 | ||
427 | static int proc_pid_auxv(struct task_struct *task, char *buffer) | |
428 | { | |
429 | int res = 0; | |
430 | struct mm_struct *mm = get_task_mm(task); | |
431 | if (mm) { | |
432 | unsigned int nwords = 0; | |
433 | do | |
434 | nwords += 2; | |
435 | while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ | |
436 | res = nwords * sizeof(mm->saved_auxv[0]); | |
437 | if (res > PAGE_SIZE) | |
438 | res = PAGE_SIZE; | |
439 | memcpy(buffer, mm->saved_auxv, res); | |
440 | mmput(mm); | |
441 | } | |
442 | return res; | |
443 | } | |
444 | ||
445 | ||
446 | #ifdef CONFIG_KALLSYMS | |
447 | /* | |
448 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
449 | * Returns the resolved symbol. If that fails, simply return the address. | |
450 | */ | |
451 | static int proc_pid_wchan(struct task_struct *task, char *buffer) | |
452 | { | |
453 | char *modname; | |
454 | const char *sym_name; | |
455 | unsigned long wchan, size, offset; | |
456 | char namebuf[KSYM_NAME_LEN+1]; | |
457 | ||
458 | wchan = get_wchan(task); | |
459 | ||
460 | sym_name = kallsyms_lookup(wchan, &size, &offset, &modname, namebuf); | |
461 | if (sym_name) | |
462 | return sprintf(buffer, "%s", sym_name); | |
463 | return sprintf(buffer, "%lu", wchan); | |
464 | } | |
465 | #endif /* CONFIG_KALLSYMS */ | |
466 | ||
467 | #ifdef CONFIG_SCHEDSTATS | |
468 | /* | |
469 | * Provides /proc/PID/schedstat | |
470 | */ | |
471 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) | |
472 | { | |
473 | return sprintf(buffer, "%lu %lu %lu\n", | |
474 | task->sched_info.cpu_time, | |
475 | task->sched_info.run_delay, | |
476 | task->sched_info.pcnt); | |
477 | } | |
478 | #endif | |
479 | ||
480 | /* The badness from the OOM killer */ | |
481 | unsigned long badness(struct task_struct *p, unsigned long uptime); | |
482 | static int proc_oom_score(struct task_struct *task, char *buffer) | |
483 | { | |
484 | unsigned long points; | |
485 | struct timespec uptime; | |
486 | ||
487 | do_posix_clock_monotonic_gettime(&uptime); | |
488 | points = badness(task, uptime.tv_sec); | |
489 | return sprintf(buffer, "%lu\n", points); | |
490 | } | |
491 | ||
492 | /************************************************************************/ | |
493 | /* Here the fs part begins */ | |
494 | /************************************************************************/ | |
495 | ||
496 | /* permission checks */ | |
497 | ||
498 | static int proc_check_root(struct inode *inode) | |
499 | { | |
500 | struct dentry *de, *base, *root; | |
501 | struct vfsmount *our_vfsmnt, *vfsmnt, *mnt; | |
502 | int res = 0; | |
503 | ||
504 | if (proc_root_link(inode, &root, &vfsmnt)) /* Ewww... */ | |
505 | return -ENOENT; | |
506 | read_lock(¤t->fs->lock); | |
507 | our_vfsmnt = mntget(current->fs->rootmnt); | |
508 | base = dget(current->fs->root); | |
509 | read_unlock(¤t->fs->lock); | |
510 | ||
511 | spin_lock(&vfsmount_lock); | |
512 | de = root; | |
513 | mnt = vfsmnt; | |
514 | ||
515 | while (vfsmnt != our_vfsmnt) { | |
516 | if (vfsmnt == vfsmnt->mnt_parent) | |
517 | goto out; | |
518 | de = vfsmnt->mnt_mountpoint; | |
519 | vfsmnt = vfsmnt->mnt_parent; | |
520 | } | |
521 | ||
522 | if (!is_subdir(de, base)) | |
523 | goto out; | |
524 | spin_unlock(&vfsmount_lock); | |
525 | ||
526 | exit: | |
527 | dput(base); | |
528 | mntput(our_vfsmnt); | |
529 | dput(root); | |
530 | mntput(mnt); | |
531 | return res; | |
532 | out: | |
533 | spin_unlock(&vfsmount_lock); | |
534 | res = -EACCES; | |
535 | goto exit; | |
536 | } | |
537 | ||
538 | static int proc_permission(struct inode *inode, int mask, struct nameidata *nd) | |
539 | { | |
540 | if (generic_permission(inode, mask, NULL) != 0) | |
541 | return -EACCES; | |
542 | return proc_check_root(inode); | |
543 | } | |
544 | ||
545 | extern struct seq_operations proc_pid_maps_op; | |
546 | static int maps_open(struct inode *inode, struct file *file) | |
547 | { | |
548 | struct task_struct *task = proc_task(inode); | |
549 | int ret = seq_open(file, &proc_pid_maps_op); | |
550 | if (!ret) { | |
551 | struct seq_file *m = file->private_data; | |
552 | m->private = task; | |
553 | } | |
554 | return ret; | |
555 | } | |
556 | ||
557 | static struct file_operations proc_maps_operations = { | |
558 | .open = maps_open, | |
559 | .read = seq_read, | |
560 | .llseek = seq_lseek, | |
561 | .release = seq_release, | |
562 | }; | |
563 | ||
6e21c8f1 CL |
564 | #ifdef CONFIG_NUMA |
565 | extern struct seq_operations proc_pid_numa_maps_op; | |
566 | static int numa_maps_open(struct inode *inode, struct file *file) | |
567 | { | |
568 | struct task_struct *task = proc_task(inode); | |
569 | int ret = seq_open(file, &proc_pid_numa_maps_op); | |
570 | if (!ret) { | |
571 | struct seq_file *m = file->private_data; | |
572 | m->private = task; | |
573 | } | |
574 | return ret; | |
575 | } | |
576 | ||
577 | static struct file_operations proc_numa_maps_operations = { | |
578 | .open = numa_maps_open, | |
579 | .read = seq_read, | |
580 | .llseek = seq_lseek, | |
581 | .release = seq_release, | |
582 | }; | |
583 | #endif | |
584 | ||
e070ad49 ML |
585 | extern struct seq_operations proc_pid_smaps_op; |
586 | static int smaps_open(struct inode *inode, struct file *file) | |
587 | { | |
588 | struct task_struct *task = proc_task(inode); | |
589 | int ret = seq_open(file, &proc_pid_smaps_op); | |
590 | if (!ret) { | |
591 | struct seq_file *m = file->private_data; | |
592 | m->private = task; | |
593 | } | |
594 | return ret; | |
595 | } | |
596 | ||
597 | static struct file_operations proc_smaps_operations = { | |
598 | .open = smaps_open, | |
599 | .read = seq_read, | |
600 | .llseek = seq_lseek, | |
601 | .release = seq_release, | |
602 | }; | |
603 | ||
1da177e4 LT |
604 | extern struct seq_operations mounts_op; |
605 | static int mounts_open(struct inode *inode, struct file *file) | |
606 | { | |
607 | struct task_struct *task = proc_task(inode); | |
608 | int ret = seq_open(file, &mounts_op); | |
609 | ||
610 | if (!ret) { | |
611 | struct seq_file *m = file->private_data; | |
612 | struct namespace *namespace; | |
613 | task_lock(task); | |
614 | namespace = task->namespace; | |
615 | if (namespace) | |
616 | get_namespace(namespace); | |
617 | task_unlock(task); | |
618 | ||
619 | if (namespace) | |
620 | m->private = namespace; | |
621 | else { | |
622 | seq_release(inode, file); | |
623 | ret = -EINVAL; | |
624 | } | |
625 | } | |
626 | return ret; | |
627 | } | |
628 | ||
629 | static int mounts_release(struct inode *inode, struct file *file) | |
630 | { | |
631 | struct seq_file *m = file->private_data; | |
632 | struct namespace *namespace = m->private; | |
633 | put_namespace(namespace); | |
634 | return seq_release(inode, file); | |
635 | } | |
636 | ||
637 | static struct file_operations proc_mounts_operations = { | |
638 | .open = mounts_open, | |
639 | .read = seq_read, | |
640 | .llseek = seq_lseek, | |
641 | .release = mounts_release, | |
642 | }; | |
643 | ||
644 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ | |
645 | ||
646 | static ssize_t proc_info_read(struct file * file, char __user * buf, | |
647 | size_t count, loff_t *ppos) | |
648 | { | |
649 | struct inode * inode = file->f_dentry->d_inode; | |
650 | unsigned long page; | |
651 | ssize_t length; | |
652 | struct task_struct *task = proc_task(inode); | |
653 | ||
654 | if (count > PROC_BLOCK_SIZE) | |
655 | count = PROC_BLOCK_SIZE; | |
656 | if (!(page = __get_free_page(GFP_KERNEL))) | |
657 | return -ENOMEM; | |
658 | ||
659 | length = PROC_I(inode)->op.proc_read(task, (char*)page); | |
660 | ||
661 | if (length >= 0) | |
662 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
663 | free_page(page); | |
664 | return length; | |
665 | } | |
666 | ||
667 | static struct file_operations proc_info_file_operations = { | |
668 | .read = proc_info_read, | |
669 | }; | |
670 | ||
671 | static int mem_open(struct inode* inode, struct file* file) | |
672 | { | |
673 | file->private_data = (void*)((long)current->self_exec_id); | |
674 | return 0; | |
675 | } | |
676 | ||
677 | static ssize_t mem_read(struct file * file, char __user * buf, | |
678 | size_t count, loff_t *ppos) | |
679 | { | |
680 | struct task_struct *task = proc_task(file->f_dentry->d_inode); | |
681 | char *page; | |
682 | unsigned long src = *ppos; | |
683 | int ret = -ESRCH; | |
684 | struct mm_struct *mm; | |
685 | ||
686 | if (!MAY_PTRACE(task) || !may_ptrace_attach(task)) | |
687 | goto out; | |
688 | ||
689 | ret = -ENOMEM; | |
690 | page = (char *)__get_free_page(GFP_USER); | |
691 | if (!page) | |
692 | goto out; | |
693 | ||
694 | ret = 0; | |
695 | ||
696 | mm = get_task_mm(task); | |
697 | if (!mm) | |
698 | goto out_free; | |
699 | ||
700 | ret = -EIO; | |
701 | ||
702 | if (file->private_data != (void*)((long)current->self_exec_id)) | |
703 | goto out_put; | |
704 | ||
705 | ret = 0; | |
706 | ||
707 | while (count > 0) { | |
708 | int this_len, retval; | |
709 | ||
710 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
711 | retval = access_process_vm(task, src, page, this_len, 0); | |
712 | if (!retval || !MAY_PTRACE(task) || !may_ptrace_attach(task)) { | |
713 | if (!ret) | |
714 | ret = -EIO; | |
715 | break; | |
716 | } | |
717 | ||
718 | if (copy_to_user(buf, page, retval)) { | |
719 | ret = -EFAULT; | |
720 | break; | |
721 | } | |
722 | ||
723 | ret += retval; | |
724 | src += retval; | |
725 | buf += retval; | |
726 | count -= retval; | |
727 | } | |
728 | *ppos = src; | |
729 | ||
730 | out_put: | |
731 | mmput(mm); | |
732 | out_free: | |
733 | free_page((unsigned long) page); | |
734 | out: | |
735 | return ret; | |
736 | } | |
737 | ||
738 | #define mem_write NULL | |
739 | ||
740 | #ifndef mem_write | |
741 | /* This is a security hazard */ | |
742 | static ssize_t mem_write(struct file * file, const char * buf, | |
743 | size_t count, loff_t *ppos) | |
744 | { | |
745 | int copied = 0; | |
746 | char *page; | |
747 | struct task_struct *task = proc_task(file->f_dentry->d_inode); | |
748 | unsigned long dst = *ppos; | |
749 | ||
750 | if (!MAY_PTRACE(task) || !may_ptrace_attach(task)) | |
751 | return -ESRCH; | |
752 | ||
753 | page = (char *)__get_free_page(GFP_USER); | |
754 | if (!page) | |
755 | return -ENOMEM; | |
756 | ||
757 | while (count > 0) { | |
758 | int this_len, retval; | |
759 | ||
760 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
761 | if (copy_from_user(page, buf, this_len)) { | |
762 | copied = -EFAULT; | |
763 | break; | |
764 | } | |
765 | retval = access_process_vm(task, dst, page, this_len, 1); | |
766 | if (!retval) { | |
767 | if (!copied) | |
768 | copied = -EIO; | |
769 | break; | |
770 | } | |
771 | copied += retval; | |
772 | buf += retval; | |
773 | dst += retval; | |
774 | count -= retval; | |
775 | } | |
776 | *ppos = dst; | |
777 | free_page((unsigned long) page); | |
778 | return copied; | |
779 | } | |
780 | #endif | |
781 | ||
782 | static loff_t mem_lseek(struct file * file, loff_t offset, int orig) | |
783 | { | |
784 | switch (orig) { | |
785 | case 0: | |
786 | file->f_pos = offset; | |
787 | break; | |
788 | case 1: | |
789 | file->f_pos += offset; | |
790 | break; | |
791 | default: | |
792 | return -EINVAL; | |
793 | } | |
794 | force_successful_syscall_return(); | |
795 | return file->f_pos; | |
796 | } | |
797 | ||
798 | static struct file_operations proc_mem_operations = { | |
799 | .llseek = mem_lseek, | |
800 | .read = mem_read, | |
801 | .write = mem_write, | |
802 | .open = mem_open, | |
803 | }; | |
804 | ||
805 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, | |
806 | size_t count, loff_t *ppos) | |
807 | { | |
808 | struct task_struct *task = proc_task(file->f_dentry->d_inode); | |
809 | char buffer[8]; | |
810 | size_t len; | |
811 | int oom_adjust = task->oomkilladj; | |
812 | loff_t __ppos = *ppos; | |
813 | ||
814 | len = sprintf(buffer, "%i\n", oom_adjust); | |
815 | if (__ppos >= len) | |
816 | return 0; | |
817 | if (count > len-__ppos) | |
818 | count = len-__ppos; | |
819 | if (copy_to_user(buf, buffer + __ppos, count)) | |
820 | return -EFAULT; | |
821 | *ppos = __ppos + count; | |
822 | return count; | |
823 | } | |
824 | ||
825 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, | |
826 | size_t count, loff_t *ppos) | |
827 | { | |
828 | struct task_struct *task = proc_task(file->f_dentry->d_inode); | |
829 | char buffer[8], *end; | |
830 | int oom_adjust; | |
831 | ||
832 | if (!capable(CAP_SYS_RESOURCE)) | |
833 | return -EPERM; | |
834 | memset(buffer, 0, 8); | |
835 | if (count > 6) | |
836 | count = 6; | |
837 | if (copy_from_user(buffer, buf, count)) | |
838 | return -EFAULT; | |
839 | oom_adjust = simple_strtol(buffer, &end, 0); | |
79befd0c | 840 | if ((oom_adjust < -16 || oom_adjust > 15) && oom_adjust != OOM_DISABLE) |
1da177e4 LT |
841 | return -EINVAL; |
842 | if (*end == '\n') | |
843 | end++; | |
844 | task->oomkilladj = oom_adjust; | |
845 | if (end - buffer == 0) | |
846 | return -EIO; | |
847 | return end - buffer; | |
848 | } | |
849 | ||
850 | static struct file_operations proc_oom_adjust_operations = { | |
851 | .read = oom_adjust_read, | |
852 | .write = oom_adjust_write, | |
853 | }; | |
854 | ||
855 | static struct inode_operations proc_mem_inode_operations = { | |
856 | .permission = proc_permission, | |
857 | }; | |
858 | ||
859 | #ifdef CONFIG_AUDITSYSCALL | |
860 | #define TMPBUFLEN 21 | |
861 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
862 | size_t count, loff_t *ppos) | |
863 | { | |
864 | struct inode * inode = file->f_dentry->d_inode; | |
865 | struct task_struct *task = proc_task(inode); | |
866 | ssize_t length; | |
867 | char tmpbuf[TMPBUFLEN]; | |
868 | ||
869 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", | |
870 | audit_get_loginuid(task->audit_context)); | |
871 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
872 | } | |
873 | ||
874 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
875 | size_t count, loff_t *ppos) | |
876 | { | |
877 | struct inode * inode = file->f_dentry->d_inode; | |
878 | char *page, *tmp; | |
879 | ssize_t length; | |
880 | struct task_struct *task = proc_task(inode); | |
881 | uid_t loginuid; | |
882 | ||
883 | if (!capable(CAP_AUDIT_CONTROL)) | |
884 | return -EPERM; | |
885 | ||
886 | if (current != task) | |
887 | return -EPERM; | |
888 | ||
889 | if (count > PAGE_SIZE) | |
890 | count = PAGE_SIZE; | |
891 | ||
892 | if (*ppos != 0) { | |
893 | /* No partial writes. */ | |
894 | return -EINVAL; | |
895 | } | |
896 | page = (char*)__get_free_page(GFP_USER); | |
897 | if (!page) | |
898 | return -ENOMEM; | |
899 | length = -EFAULT; | |
900 | if (copy_from_user(page, buf, count)) | |
901 | goto out_free_page; | |
902 | ||
903 | loginuid = simple_strtoul(page, &tmp, 10); | |
904 | if (tmp == page) { | |
905 | length = -EINVAL; | |
906 | goto out_free_page; | |
907 | ||
908 | } | |
456be6cd | 909 | length = audit_set_loginuid(task, loginuid); |
1da177e4 LT |
910 | if (likely(length == 0)) |
911 | length = count; | |
912 | ||
913 | out_free_page: | |
914 | free_page((unsigned long) page); | |
915 | return length; | |
916 | } | |
917 | ||
918 | static struct file_operations proc_loginuid_operations = { | |
919 | .read = proc_loginuid_read, | |
920 | .write = proc_loginuid_write, | |
921 | }; | |
922 | #endif | |
923 | ||
924 | #ifdef CONFIG_SECCOMP | |
925 | static ssize_t seccomp_read(struct file *file, char __user *buf, | |
926 | size_t count, loff_t *ppos) | |
927 | { | |
928 | struct task_struct *tsk = proc_task(file->f_dentry->d_inode); | |
929 | char __buf[20]; | |
930 | loff_t __ppos = *ppos; | |
931 | size_t len; | |
932 | ||
933 | /* no need to print the trailing zero, so use only len */ | |
934 | len = sprintf(__buf, "%u\n", tsk->seccomp.mode); | |
935 | if (__ppos >= len) | |
936 | return 0; | |
937 | if (count > len - __ppos) | |
938 | count = len - __ppos; | |
939 | if (copy_to_user(buf, __buf + __ppos, count)) | |
940 | return -EFAULT; | |
941 | *ppos = __ppos + count; | |
942 | return count; | |
943 | } | |
944 | ||
945 | static ssize_t seccomp_write(struct file *file, const char __user *buf, | |
946 | size_t count, loff_t *ppos) | |
947 | { | |
948 | struct task_struct *tsk = proc_task(file->f_dentry->d_inode); | |
949 | char __buf[20], *end; | |
950 | unsigned int seccomp_mode; | |
951 | ||
952 | /* can set it only once to be even more secure */ | |
953 | if (unlikely(tsk->seccomp.mode)) | |
954 | return -EPERM; | |
955 | ||
956 | memset(__buf, 0, sizeof(__buf)); | |
957 | count = min(count, sizeof(__buf) - 1); | |
958 | if (copy_from_user(__buf, buf, count)) | |
959 | return -EFAULT; | |
960 | seccomp_mode = simple_strtoul(__buf, &end, 0); | |
961 | if (*end == '\n') | |
962 | end++; | |
963 | if (seccomp_mode && seccomp_mode <= NR_SECCOMP_MODES) { | |
964 | tsk->seccomp.mode = seccomp_mode; | |
965 | set_tsk_thread_flag(tsk, TIF_SECCOMP); | |
966 | } else | |
967 | return -EINVAL; | |
968 | if (unlikely(!(end - __buf))) | |
969 | return -EIO; | |
970 | return end - __buf; | |
971 | } | |
972 | ||
973 | static struct file_operations proc_seccomp_operations = { | |
974 | .read = seccomp_read, | |
975 | .write = seccomp_write, | |
976 | }; | |
977 | #endif /* CONFIG_SECCOMP */ | |
978 | ||
008b150a | 979 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
980 | { |
981 | struct inode *inode = dentry->d_inode; | |
982 | int error = -EACCES; | |
983 | ||
984 | /* We don't need a base pointer in the /proc filesystem */ | |
985 | path_release(nd); | |
986 | ||
987 | if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE)) | |
988 | goto out; | |
989 | error = proc_check_root(inode); | |
990 | if (error) | |
991 | goto out; | |
992 | ||
993 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->dentry, &nd->mnt); | |
994 | nd->last_type = LAST_BIND; | |
995 | out: | |
008b150a | 996 | return ERR_PTR(error); |
1da177e4 LT |
997 | } |
998 | ||
999 | static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt, | |
1000 | char __user *buffer, int buflen) | |
1001 | { | |
1002 | struct inode * inode; | |
1003 | char *tmp = (char*)__get_free_page(GFP_KERNEL), *path; | |
1004 | int len; | |
1005 | ||
1006 | if (!tmp) | |
1007 | return -ENOMEM; | |
1008 | ||
1009 | inode = dentry->d_inode; | |
1010 | path = d_path(dentry, mnt, tmp, PAGE_SIZE); | |
1011 | len = PTR_ERR(path); | |
1012 | if (IS_ERR(path)) | |
1013 | goto out; | |
1014 | len = tmp + PAGE_SIZE - 1 - path; | |
1015 | ||
1016 | if (len > buflen) | |
1017 | len = buflen; | |
1018 | if (copy_to_user(buffer, path, len)) | |
1019 | len = -EFAULT; | |
1020 | out: | |
1021 | free_page((unsigned long)tmp); | |
1022 | return len; | |
1023 | } | |
1024 | ||
1025 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1026 | { | |
1027 | int error = -EACCES; | |
1028 | struct inode *inode = dentry->d_inode; | |
1029 | struct dentry *de; | |
1030 | struct vfsmount *mnt = NULL; | |
1031 | ||
1032 | lock_kernel(); | |
1033 | ||
1034 | if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE)) | |
1035 | goto out; | |
1036 | error = proc_check_root(inode); | |
1037 | if (error) | |
1038 | goto out; | |
1039 | ||
1040 | error = PROC_I(inode)->op.proc_get_link(inode, &de, &mnt); | |
1041 | if (error) | |
1042 | goto out; | |
1043 | ||
1044 | error = do_proc_readlink(de, mnt, buffer, buflen); | |
1045 | dput(de); | |
1046 | mntput(mnt); | |
1047 | out: | |
1048 | unlock_kernel(); | |
1049 | return error; | |
1050 | } | |
1051 | ||
1052 | static struct inode_operations proc_pid_link_inode_operations = { | |
1053 | .readlink = proc_pid_readlink, | |
1054 | .follow_link = proc_pid_follow_link | |
1055 | }; | |
1056 | ||
1057 | #define NUMBUF 10 | |
1058 | ||
1059 | static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir) | |
1060 | { | |
1061 | struct inode *inode = filp->f_dentry->d_inode; | |
1062 | struct task_struct *p = proc_task(inode); | |
1063 | unsigned int fd, tid, ino; | |
1064 | int retval; | |
1065 | char buf[NUMBUF]; | |
1066 | struct files_struct * files; | |
1067 | ||
1068 | retval = -ENOENT; | |
1069 | if (!pid_alive(p)) | |
1070 | goto out; | |
1071 | retval = 0; | |
1072 | tid = p->pid; | |
1073 | ||
1074 | fd = filp->f_pos; | |
1075 | switch (fd) { | |
1076 | case 0: | |
1077 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
1078 | goto out; | |
1079 | filp->f_pos++; | |
1080 | case 1: | |
1081 | ino = fake_ino(tid, PROC_TID_INO); | |
1082 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
1083 | goto out; | |
1084 | filp->f_pos++; | |
1085 | default: | |
1086 | files = get_files_struct(p); | |
1087 | if (!files) | |
1088 | goto out; | |
1089 | spin_lock(&files->file_lock); | |
1090 | for (fd = filp->f_pos-2; | |
1091 | fd < files->max_fds; | |
1092 | fd++, filp->f_pos++) { | |
1093 | unsigned int i,j; | |
1094 | ||
1095 | if (!fcheck_files(files, fd)) | |
1096 | continue; | |
1097 | spin_unlock(&files->file_lock); | |
1098 | ||
1099 | j = NUMBUF; | |
1100 | i = fd; | |
1101 | do { | |
1102 | j--; | |
1103 | buf[j] = '0' + (i % 10); | |
1104 | i /= 10; | |
1105 | } while (i); | |
1106 | ||
1107 | ino = fake_ino(tid, PROC_TID_FD_DIR + fd); | |
1108 | if (filldir(dirent, buf+j, NUMBUF-j, fd+2, ino, DT_LNK) < 0) { | |
1109 | spin_lock(&files->file_lock); | |
1110 | break; | |
1111 | } | |
1112 | spin_lock(&files->file_lock); | |
1113 | } | |
1114 | spin_unlock(&files->file_lock); | |
1115 | put_files_struct(files); | |
1116 | } | |
1117 | out: | |
1118 | return retval; | |
1119 | } | |
1120 | ||
1121 | static int proc_pident_readdir(struct file *filp, | |
1122 | void *dirent, filldir_t filldir, | |
1123 | struct pid_entry *ents, unsigned int nents) | |
1124 | { | |
1125 | int i; | |
1126 | int pid; | |
1127 | struct dentry *dentry = filp->f_dentry; | |
1128 | struct inode *inode = dentry->d_inode; | |
1129 | struct pid_entry *p; | |
1130 | ino_t ino; | |
1131 | int ret; | |
1132 | ||
1133 | ret = -ENOENT; | |
1134 | if (!pid_alive(proc_task(inode))) | |
1135 | goto out; | |
1136 | ||
1137 | ret = 0; | |
1138 | pid = proc_task(inode)->pid; | |
1139 | i = filp->f_pos; | |
1140 | switch (i) { | |
1141 | case 0: | |
1142 | ino = inode->i_ino; | |
1143 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) | |
1144 | goto out; | |
1145 | i++; | |
1146 | filp->f_pos++; | |
1147 | /* fall through */ | |
1148 | case 1: | |
1149 | ino = parent_ino(dentry); | |
1150 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) | |
1151 | goto out; | |
1152 | i++; | |
1153 | filp->f_pos++; | |
1154 | /* fall through */ | |
1155 | default: | |
1156 | i -= 2; | |
1157 | if (i >= nents) { | |
1158 | ret = 1; | |
1159 | goto out; | |
1160 | } | |
1161 | p = ents + i; | |
1162 | while (p->name) { | |
1163 | if (filldir(dirent, p->name, p->len, filp->f_pos, | |
1164 | fake_ino(pid, p->type), p->mode >> 12) < 0) | |
1165 | goto out; | |
1166 | filp->f_pos++; | |
1167 | p++; | |
1168 | } | |
1169 | } | |
1170 | ||
1171 | ret = 1; | |
1172 | out: | |
1173 | return ret; | |
1174 | } | |
1175 | ||
1176 | static int proc_tgid_base_readdir(struct file * filp, | |
1177 | void * dirent, filldir_t filldir) | |
1178 | { | |
1179 | return proc_pident_readdir(filp,dirent,filldir, | |
1180 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); | |
1181 | } | |
1182 | ||
1183 | static int proc_tid_base_readdir(struct file * filp, | |
1184 | void * dirent, filldir_t filldir) | |
1185 | { | |
1186 | return proc_pident_readdir(filp,dirent,filldir, | |
1187 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); | |
1188 | } | |
1189 | ||
1190 | /* building an inode */ | |
1191 | ||
1192 | static int task_dumpable(struct task_struct *task) | |
1193 | { | |
1194 | int dumpable = 0; | |
1195 | struct mm_struct *mm; | |
1196 | ||
1197 | task_lock(task); | |
1198 | mm = task->mm; | |
1199 | if (mm) | |
1200 | dumpable = mm->dumpable; | |
1201 | task_unlock(task); | |
d6e71144 AC |
1202 | if(dumpable == 1) |
1203 | return 1; | |
1204 | return 0; | |
1da177e4 LT |
1205 | } |
1206 | ||
1207 | ||
1208 | static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task, int ino) | |
1209 | { | |
1210 | struct inode * inode; | |
1211 | struct proc_inode *ei; | |
1212 | ||
1213 | /* We need a new inode */ | |
1214 | ||
1215 | inode = new_inode(sb); | |
1216 | if (!inode) | |
1217 | goto out; | |
1218 | ||
1219 | /* Common stuff */ | |
1220 | ei = PROC_I(inode); | |
1221 | ei->task = NULL; | |
1222 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
1223 | inode->i_ino = fake_ino(task->pid, ino); | |
1224 | ||
1225 | if (!pid_alive(task)) | |
1226 | goto out_unlock; | |
1227 | ||
1228 | /* | |
1229 | * grab the reference to task. | |
1230 | */ | |
1231 | get_task_struct(task); | |
1232 | ei->task = task; | |
1233 | ei->type = ino; | |
1234 | inode->i_uid = 0; | |
1235 | inode->i_gid = 0; | |
1236 | if (ino == PROC_TGID_INO || ino == PROC_TID_INO || task_dumpable(task)) { | |
1237 | inode->i_uid = task->euid; | |
1238 | inode->i_gid = task->egid; | |
1239 | } | |
1240 | security_task_to_inode(task, inode); | |
1241 | ||
1242 | out: | |
1243 | return inode; | |
1244 | ||
1245 | out_unlock: | |
1246 | ei->pde = NULL; | |
1247 | iput(inode); | |
1248 | return NULL; | |
1249 | } | |
1250 | ||
1251 | /* dentry stuff */ | |
1252 | ||
1253 | /* | |
1254 | * Exceptional case: normally we are not allowed to unhash a busy | |
1255 | * directory. In this case, however, we can do it - no aliasing problems | |
1256 | * due to the way we treat inodes. | |
1257 | * | |
1258 | * Rewrite the inode's ownerships here because the owning task may have | |
1259 | * performed a setuid(), etc. | |
1260 | */ | |
1261 | static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1262 | { | |
1263 | struct inode *inode = dentry->d_inode; | |
1264 | struct task_struct *task = proc_task(inode); | |
1265 | if (pid_alive(task)) { | |
1266 | if (proc_type(inode) == PROC_TGID_INO || proc_type(inode) == PROC_TID_INO || task_dumpable(task)) { | |
1267 | inode->i_uid = task->euid; | |
1268 | inode->i_gid = task->egid; | |
1269 | } else { | |
1270 | inode->i_uid = 0; | |
1271 | inode->i_gid = 0; | |
1272 | } | |
1273 | security_task_to_inode(task, inode); | |
1274 | return 1; | |
1275 | } | |
1276 | d_drop(dentry); | |
1277 | return 0; | |
1278 | } | |
1279 | ||
1280 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1281 | { | |
1282 | struct inode *inode = dentry->d_inode; | |
1283 | struct task_struct *task = proc_task(inode); | |
1284 | int fd = proc_type(inode) - PROC_TID_FD_DIR; | |
1285 | struct files_struct *files; | |
1286 | ||
1287 | files = get_files_struct(task); | |
1288 | if (files) { | |
1289 | spin_lock(&files->file_lock); | |
1290 | if (fcheck_files(files, fd)) { | |
1291 | spin_unlock(&files->file_lock); | |
1292 | put_files_struct(files); | |
1293 | if (task_dumpable(task)) { | |
1294 | inode->i_uid = task->euid; | |
1295 | inode->i_gid = task->egid; | |
1296 | } else { | |
1297 | inode->i_uid = 0; | |
1298 | inode->i_gid = 0; | |
1299 | } | |
1300 | security_task_to_inode(task, inode); | |
1301 | return 1; | |
1302 | } | |
1303 | spin_unlock(&files->file_lock); | |
1304 | put_files_struct(files); | |
1305 | } | |
1306 | d_drop(dentry); | |
1307 | return 0; | |
1308 | } | |
1309 | ||
1310 | static void pid_base_iput(struct dentry *dentry, struct inode *inode) | |
1311 | { | |
1312 | struct task_struct *task = proc_task(inode); | |
1313 | spin_lock(&task->proc_lock); | |
1314 | if (task->proc_dentry == dentry) | |
1315 | task->proc_dentry = NULL; | |
1316 | spin_unlock(&task->proc_lock); | |
1317 | iput(inode); | |
1318 | } | |
1319 | ||
1320 | static int pid_delete_dentry(struct dentry * dentry) | |
1321 | { | |
1322 | /* Is the task we represent dead? | |
1323 | * If so, then don't put the dentry on the lru list, | |
1324 | * kill it immediately. | |
1325 | */ | |
1326 | return !pid_alive(proc_task(dentry->d_inode)); | |
1327 | } | |
1328 | ||
1329 | static struct dentry_operations tid_fd_dentry_operations = | |
1330 | { | |
1331 | .d_revalidate = tid_fd_revalidate, | |
1332 | .d_delete = pid_delete_dentry, | |
1333 | }; | |
1334 | ||
1335 | static struct dentry_operations pid_dentry_operations = | |
1336 | { | |
1337 | .d_revalidate = pid_revalidate, | |
1338 | .d_delete = pid_delete_dentry, | |
1339 | }; | |
1340 | ||
1341 | static struct dentry_operations pid_base_dentry_operations = | |
1342 | { | |
1343 | .d_revalidate = pid_revalidate, | |
1344 | .d_iput = pid_base_iput, | |
1345 | .d_delete = pid_delete_dentry, | |
1346 | }; | |
1347 | ||
1348 | /* Lookups */ | |
1349 | ||
1350 | static unsigned name_to_int(struct dentry *dentry) | |
1351 | { | |
1352 | const char *name = dentry->d_name.name; | |
1353 | int len = dentry->d_name.len; | |
1354 | unsigned n = 0; | |
1355 | ||
1356 | if (len > 1 && *name == '0') | |
1357 | goto out; | |
1358 | while (len-- > 0) { | |
1359 | unsigned c = *name++ - '0'; | |
1360 | if (c > 9) | |
1361 | goto out; | |
1362 | if (n >= (~0U-9)/10) | |
1363 | goto out; | |
1364 | n *= 10; | |
1365 | n += c; | |
1366 | } | |
1367 | return n; | |
1368 | out: | |
1369 | return ~0U; | |
1370 | } | |
1371 | ||
1372 | /* SMP-safe */ | |
1373 | static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, struct nameidata *nd) | |
1374 | { | |
1375 | struct task_struct *task = proc_task(dir); | |
1376 | unsigned fd = name_to_int(dentry); | |
1377 | struct file * file; | |
1378 | struct files_struct * files; | |
1379 | struct inode *inode; | |
1380 | struct proc_inode *ei; | |
1381 | ||
1382 | if (fd == ~0U) | |
1383 | goto out; | |
1384 | if (!pid_alive(task)) | |
1385 | goto out; | |
1386 | ||
1387 | inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_FD_DIR+fd); | |
1388 | if (!inode) | |
1389 | goto out; | |
1390 | ei = PROC_I(inode); | |
1391 | files = get_files_struct(task); | |
1392 | if (!files) | |
1393 | goto out_unlock; | |
1394 | inode->i_mode = S_IFLNK; | |
1395 | spin_lock(&files->file_lock); | |
1396 | file = fcheck_files(files, fd); | |
1397 | if (!file) | |
1398 | goto out_unlock2; | |
1399 | if (file->f_mode & 1) | |
1400 | inode->i_mode |= S_IRUSR | S_IXUSR; | |
1401 | if (file->f_mode & 2) | |
1402 | inode->i_mode |= S_IWUSR | S_IXUSR; | |
1403 | spin_unlock(&files->file_lock); | |
1404 | put_files_struct(files); | |
1405 | inode->i_op = &proc_pid_link_inode_operations; | |
1406 | inode->i_size = 64; | |
1407 | ei->op.proc_get_link = proc_fd_link; | |
1408 | dentry->d_op = &tid_fd_dentry_operations; | |
1409 | d_add(dentry, inode); | |
1410 | return NULL; | |
1411 | ||
1412 | out_unlock2: | |
1413 | spin_unlock(&files->file_lock); | |
1414 | put_files_struct(files); | |
1415 | out_unlock: | |
1416 | iput(inode); | |
1417 | out: | |
1418 | return ERR_PTR(-ENOENT); | |
1419 | } | |
1420 | ||
1421 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir); | |
1422 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd); | |
1423 | ||
1424 | static struct file_operations proc_fd_operations = { | |
1425 | .read = generic_read_dir, | |
1426 | .readdir = proc_readfd, | |
1427 | }; | |
1428 | ||
1429 | static struct file_operations proc_task_operations = { | |
1430 | .read = generic_read_dir, | |
1431 | .readdir = proc_task_readdir, | |
1432 | }; | |
1433 | ||
1434 | /* | |
1435 | * proc directories can do almost nothing.. | |
1436 | */ | |
1437 | static struct inode_operations proc_fd_inode_operations = { | |
1438 | .lookup = proc_lookupfd, | |
1439 | .permission = proc_permission, | |
1440 | }; | |
1441 | ||
1442 | static struct inode_operations proc_task_inode_operations = { | |
1443 | .lookup = proc_task_lookup, | |
1444 | .permission = proc_permission, | |
1445 | }; | |
1446 | ||
1447 | #ifdef CONFIG_SECURITY | |
1448 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
1449 | size_t count, loff_t *ppos) | |
1450 | { | |
1451 | struct inode * inode = file->f_dentry->d_inode; | |
1452 | unsigned long page; | |
1453 | ssize_t length; | |
1454 | struct task_struct *task = proc_task(inode); | |
1455 | ||
1456 | if (count > PAGE_SIZE) | |
1457 | count = PAGE_SIZE; | |
1458 | if (!(page = __get_free_page(GFP_KERNEL))) | |
1459 | return -ENOMEM; | |
1460 | ||
1461 | length = security_getprocattr(task, | |
1462 | (char*)file->f_dentry->d_name.name, | |
1463 | (void*)page, count); | |
1464 | if (length >= 0) | |
1465 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
1466 | free_page(page); | |
1467 | return length; | |
1468 | } | |
1469 | ||
1470 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, | |
1471 | size_t count, loff_t *ppos) | |
1472 | { | |
1473 | struct inode * inode = file->f_dentry->d_inode; | |
1474 | char *page; | |
1475 | ssize_t length; | |
1476 | struct task_struct *task = proc_task(inode); | |
1477 | ||
1478 | if (count > PAGE_SIZE) | |
1479 | count = PAGE_SIZE; | |
1480 | if (*ppos != 0) { | |
1481 | /* No partial writes. */ | |
1482 | return -EINVAL; | |
1483 | } | |
1484 | page = (char*)__get_free_page(GFP_USER); | |
1485 | if (!page) | |
1486 | return -ENOMEM; | |
1487 | length = -EFAULT; | |
1488 | if (copy_from_user(page, buf, count)) | |
1489 | goto out; | |
1490 | ||
1491 | length = security_setprocattr(task, | |
1492 | (char*)file->f_dentry->d_name.name, | |
1493 | (void*)page, count); | |
1494 | out: | |
1495 | free_page((unsigned long) page); | |
1496 | return length; | |
1497 | } | |
1498 | ||
1499 | static struct file_operations proc_pid_attr_operations = { | |
1500 | .read = proc_pid_attr_read, | |
1501 | .write = proc_pid_attr_write, | |
1502 | }; | |
1503 | ||
1504 | static struct file_operations proc_tid_attr_operations; | |
1505 | static struct inode_operations proc_tid_attr_inode_operations; | |
1506 | static struct file_operations proc_tgid_attr_operations; | |
1507 | static struct inode_operations proc_tgid_attr_inode_operations; | |
1508 | #endif | |
1509 | ||
f246315e DD |
1510 | static int get_tid_list(int index, unsigned int *tids, struct inode *dir); |
1511 | ||
1da177e4 LT |
1512 | /* SMP-safe */ |
1513 | static struct dentry *proc_pident_lookup(struct inode *dir, | |
1514 | struct dentry *dentry, | |
1515 | struct pid_entry *ents) | |
1516 | { | |
1517 | struct inode *inode; | |
1518 | int error; | |
1519 | struct task_struct *task = proc_task(dir); | |
1520 | struct pid_entry *p; | |
1521 | struct proc_inode *ei; | |
1522 | ||
1523 | error = -ENOENT; | |
1524 | inode = NULL; | |
1525 | ||
1526 | if (!pid_alive(task)) | |
1527 | goto out; | |
1528 | ||
1529 | for (p = ents; p->name; p++) { | |
1530 | if (p->len != dentry->d_name.len) | |
1531 | continue; | |
1532 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
1533 | break; | |
1534 | } | |
1535 | if (!p->name) | |
1536 | goto out; | |
1537 | ||
1538 | error = -EINVAL; | |
1539 | inode = proc_pid_make_inode(dir->i_sb, task, p->type); | |
1540 | if (!inode) | |
1541 | goto out; | |
1542 | ||
1543 | ei = PROC_I(inode); | |
1544 | inode->i_mode = p->mode; | |
1545 | /* | |
1546 | * Yes, it does not scale. And it should not. Don't add | |
1547 | * new entries into /proc/<tgid>/ without very good reasons. | |
1548 | */ | |
1549 | switch(p->type) { | |
1550 | case PROC_TGID_TASK: | |
f246315e | 1551 | inode->i_nlink = 2 + get_tid_list(2, NULL, dir); |
1da177e4 LT |
1552 | inode->i_op = &proc_task_inode_operations; |
1553 | inode->i_fop = &proc_task_operations; | |
1554 | break; | |
1555 | case PROC_TID_FD: | |
1556 | case PROC_TGID_FD: | |
1557 | inode->i_nlink = 2; | |
1558 | inode->i_op = &proc_fd_inode_operations; | |
1559 | inode->i_fop = &proc_fd_operations; | |
1560 | break; | |
1561 | case PROC_TID_EXE: | |
1562 | case PROC_TGID_EXE: | |
1563 | inode->i_op = &proc_pid_link_inode_operations; | |
1564 | ei->op.proc_get_link = proc_exe_link; | |
1565 | break; | |
1566 | case PROC_TID_CWD: | |
1567 | case PROC_TGID_CWD: | |
1568 | inode->i_op = &proc_pid_link_inode_operations; | |
1569 | ei->op.proc_get_link = proc_cwd_link; | |
1570 | break; | |
1571 | case PROC_TID_ROOT: | |
1572 | case PROC_TGID_ROOT: | |
1573 | inode->i_op = &proc_pid_link_inode_operations; | |
1574 | ei->op.proc_get_link = proc_root_link; | |
1575 | break; | |
1576 | case PROC_TID_ENVIRON: | |
1577 | case PROC_TGID_ENVIRON: | |
1578 | inode->i_fop = &proc_info_file_operations; | |
1579 | ei->op.proc_read = proc_pid_environ; | |
1580 | break; | |
1581 | case PROC_TID_AUXV: | |
1582 | case PROC_TGID_AUXV: | |
1583 | inode->i_fop = &proc_info_file_operations; | |
1584 | ei->op.proc_read = proc_pid_auxv; | |
1585 | break; | |
1586 | case PROC_TID_STATUS: | |
1587 | case PROC_TGID_STATUS: | |
1588 | inode->i_fop = &proc_info_file_operations; | |
1589 | ei->op.proc_read = proc_pid_status; | |
1590 | break; | |
1591 | case PROC_TID_STAT: | |
1592 | inode->i_fop = &proc_info_file_operations; | |
1593 | ei->op.proc_read = proc_tid_stat; | |
1594 | break; | |
1595 | case PROC_TGID_STAT: | |
1596 | inode->i_fop = &proc_info_file_operations; | |
1597 | ei->op.proc_read = proc_tgid_stat; | |
1598 | break; | |
1599 | case PROC_TID_CMDLINE: | |
1600 | case PROC_TGID_CMDLINE: | |
1601 | inode->i_fop = &proc_info_file_operations; | |
1602 | ei->op.proc_read = proc_pid_cmdline; | |
1603 | break; | |
1604 | case PROC_TID_STATM: | |
1605 | case PROC_TGID_STATM: | |
1606 | inode->i_fop = &proc_info_file_operations; | |
1607 | ei->op.proc_read = proc_pid_statm; | |
1608 | break; | |
1609 | case PROC_TID_MAPS: | |
1610 | case PROC_TGID_MAPS: | |
1611 | inode->i_fop = &proc_maps_operations; | |
1612 | break; | |
6e21c8f1 CL |
1613 | #ifdef CONFIG_NUMA |
1614 | case PROC_TID_NUMA_MAPS: | |
1615 | case PROC_TGID_NUMA_MAPS: | |
1616 | inode->i_fop = &proc_numa_maps_operations; | |
1617 | break; | |
1618 | #endif | |
1da177e4 LT |
1619 | case PROC_TID_MEM: |
1620 | case PROC_TGID_MEM: | |
1621 | inode->i_op = &proc_mem_inode_operations; | |
1622 | inode->i_fop = &proc_mem_operations; | |
1623 | break; | |
1624 | #ifdef CONFIG_SECCOMP | |
1625 | case PROC_TID_SECCOMP: | |
1626 | case PROC_TGID_SECCOMP: | |
1627 | inode->i_fop = &proc_seccomp_operations; | |
1628 | break; | |
1629 | #endif /* CONFIG_SECCOMP */ | |
1630 | case PROC_TID_MOUNTS: | |
1631 | case PROC_TGID_MOUNTS: | |
1632 | inode->i_fop = &proc_mounts_operations; | |
1633 | break; | |
e070ad49 ML |
1634 | case PROC_TID_SMAPS: |
1635 | case PROC_TGID_SMAPS: | |
1636 | inode->i_fop = &proc_smaps_operations; | |
1637 | break; | |
1da177e4 LT |
1638 | #ifdef CONFIG_SECURITY |
1639 | case PROC_TID_ATTR: | |
1640 | inode->i_nlink = 2; | |
1641 | inode->i_op = &proc_tid_attr_inode_operations; | |
1642 | inode->i_fop = &proc_tid_attr_operations; | |
1643 | break; | |
1644 | case PROC_TGID_ATTR: | |
1645 | inode->i_nlink = 2; | |
1646 | inode->i_op = &proc_tgid_attr_inode_operations; | |
1647 | inode->i_fop = &proc_tgid_attr_operations; | |
1648 | break; | |
1649 | case PROC_TID_ATTR_CURRENT: | |
1650 | case PROC_TGID_ATTR_CURRENT: | |
1651 | case PROC_TID_ATTR_PREV: | |
1652 | case PROC_TGID_ATTR_PREV: | |
1653 | case PROC_TID_ATTR_EXEC: | |
1654 | case PROC_TGID_ATTR_EXEC: | |
1655 | case PROC_TID_ATTR_FSCREATE: | |
1656 | case PROC_TGID_ATTR_FSCREATE: | |
1657 | inode->i_fop = &proc_pid_attr_operations; | |
1658 | break; | |
1659 | #endif | |
1660 | #ifdef CONFIG_KALLSYMS | |
1661 | case PROC_TID_WCHAN: | |
1662 | case PROC_TGID_WCHAN: | |
1663 | inode->i_fop = &proc_info_file_operations; | |
1664 | ei->op.proc_read = proc_pid_wchan; | |
1665 | break; | |
1666 | #endif | |
1667 | #ifdef CONFIG_SCHEDSTATS | |
1668 | case PROC_TID_SCHEDSTAT: | |
1669 | case PROC_TGID_SCHEDSTAT: | |
1670 | inode->i_fop = &proc_info_file_operations; | |
1671 | ei->op.proc_read = proc_pid_schedstat; | |
1672 | break; | |
1673 | #endif | |
1674 | #ifdef CONFIG_CPUSETS | |
1675 | case PROC_TID_CPUSET: | |
1676 | case PROC_TGID_CPUSET: | |
1677 | inode->i_fop = &proc_cpuset_operations; | |
1678 | break; | |
1679 | #endif | |
1680 | case PROC_TID_OOM_SCORE: | |
1681 | case PROC_TGID_OOM_SCORE: | |
1682 | inode->i_fop = &proc_info_file_operations; | |
1683 | ei->op.proc_read = proc_oom_score; | |
1684 | break; | |
1685 | case PROC_TID_OOM_ADJUST: | |
1686 | case PROC_TGID_OOM_ADJUST: | |
1687 | inode->i_fop = &proc_oom_adjust_operations; | |
1688 | break; | |
1689 | #ifdef CONFIG_AUDITSYSCALL | |
1690 | case PROC_TID_LOGINUID: | |
1691 | case PROC_TGID_LOGINUID: | |
1692 | inode->i_fop = &proc_loginuid_operations; | |
1693 | break; | |
1694 | #endif | |
1695 | default: | |
1696 | printk("procfs: impossible type (%d)",p->type); | |
1697 | iput(inode); | |
1698 | return ERR_PTR(-EINVAL); | |
1699 | } | |
1700 | dentry->d_op = &pid_dentry_operations; | |
1701 | d_add(dentry, inode); | |
1702 | return NULL; | |
1703 | ||
1704 | out: | |
1705 | return ERR_PTR(error); | |
1706 | } | |
1707 | ||
1708 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ | |
1709 | return proc_pident_lookup(dir, dentry, tgid_base_stuff); | |
1710 | } | |
1711 | ||
1712 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ | |
1713 | return proc_pident_lookup(dir, dentry, tid_base_stuff); | |
1714 | } | |
1715 | ||
1716 | static struct file_operations proc_tgid_base_operations = { | |
1717 | .read = generic_read_dir, | |
1718 | .readdir = proc_tgid_base_readdir, | |
1719 | }; | |
1720 | ||
1721 | static struct file_operations proc_tid_base_operations = { | |
1722 | .read = generic_read_dir, | |
1723 | .readdir = proc_tid_base_readdir, | |
1724 | }; | |
1725 | ||
1726 | static struct inode_operations proc_tgid_base_inode_operations = { | |
1727 | .lookup = proc_tgid_base_lookup, | |
1728 | }; | |
1729 | ||
1730 | static struct inode_operations proc_tid_base_inode_operations = { | |
1731 | .lookup = proc_tid_base_lookup, | |
1732 | }; | |
1733 | ||
1734 | #ifdef CONFIG_SECURITY | |
1735 | static int proc_tgid_attr_readdir(struct file * filp, | |
1736 | void * dirent, filldir_t filldir) | |
1737 | { | |
1738 | return proc_pident_readdir(filp,dirent,filldir, | |
1739 | tgid_attr_stuff,ARRAY_SIZE(tgid_attr_stuff)); | |
1740 | } | |
1741 | ||
1742 | static int proc_tid_attr_readdir(struct file * filp, | |
1743 | void * dirent, filldir_t filldir) | |
1744 | { | |
1745 | return proc_pident_readdir(filp,dirent,filldir, | |
1746 | tid_attr_stuff,ARRAY_SIZE(tid_attr_stuff)); | |
1747 | } | |
1748 | ||
1749 | static struct file_operations proc_tgid_attr_operations = { | |
1750 | .read = generic_read_dir, | |
1751 | .readdir = proc_tgid_attr_readdir, | |
1752 | }; | |
1753 | ||
1754 | static struct file_operations proc_tid_attr_operations = { | |
1755 | .read = generic_read_dir, | |
1756 | .readdir = proc_tid_attr_readdir, | |
1757 | }; | |
1758 | ||
1759 | static struct dentry *proc_tgid_attr_lookup(struct inode *dir, | |
1760 | struct dentry *dentry, struct nameidata *nd) | |
1761 | { | |
1762 | return proc_pident_lookup(dir, dentry, tgid_attr_stuff); | |
1763 | } | |
1764 | ||
1765 | static struct dentry *proc_tid_attr_lookup(struct inode *dir, | |
1766 | struct dentry *dentry, struct nameidata *nd) | |
1767 | { | |
1768 | return proc_pident_lookup(dir, dentry, tid_attr_stuff); | |
1769 | } | |
1770 | ||
1771 | static struct inode_operations proc_tgid_attr_inode_operations = { | |
1772 | .lookup = proc_tgid_attr_lookup, | |
1773 | }; | |
1774 | ||
1775 | static struct inode_operations proc_tid_attr_inode_operations = { | |
1776 | .lookup = proc_tid_attr_lookup, | |
1777 | }; | |
1778 | #endif | |
1779 | ||
1780 | /* | |
1781 | * /proc/self: | |
1782 | */ | |
1783 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, | |
1784 | int buflen) | |
1785 | { | |
1786 | char tmp[30]; | |
1787 | sprintf(tmp, "%d", current->tgid); | |
1788 | return vfs_readlink(dentry,buffer,buflen,tmp); | |
1789 | } | |
1790 | ||
008b150a | 1791 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1792 | { |
1793 | char tmp[30]; | |
1794 | sprintf(tmp, "%d", current->tgid); | |
008b150a | 1795 | return ERR_PTR(vfs_follow_link(nd,tmp)); |
1da177e4 LT |
1796 | } |
1797 | ||
1798 | static struct inode_operations proc_self_inode_operations = { | |
1799 | .readlink = proc_self_readlink, | |
1800 | .follow_link = proc_self_follow_link, | |
1801 | }; | |
1802 | ||
1803 | /** | |
4dc3b16b | 1804 | * proc_pid_unhash - Unhash /proc/@pid entry from the dcache. |
1da177e4 LT |
1805 | * @p: task that should be flushed. |
1806 | * | |
4dc3b16b | 1807 | * Drops the /proc/@pid dcache entry from the hash chains. |
1da177e4 | 1808 | * |
4dc3b16b PP |
1809 | * Dropping /proc/@pid entries and detach_pid must be synchroneous, |
1810 | * otherwise e.g. /proc/@pid/exe might point to the wrong executable, | |
1da177e4 LT |
1811 | * if the pid value is immediately reused. This is enforced by |
1812 | * - caller must acquire spin_lock(p->proc_lock) | |
1813 | * - must be called before detach_pid() | |
1814 | * - proc_pid_lookup acquires proc_lock, and checks that | |
1815 | * the target is not dead by looking at the attach count | |
1816 | * of PIDTYPE_PID. | |
1817 | */ | |
1818 | ||
1819 | struct dentry *proc_pid_unhash(struct task_struct *p) | |
1820 | { | |
1821 | struct dentry *proc_dentry; | |
1822 | ||
1823 | proc_dentry = p->proc_dentry; | |
1824 | if (proc_dentry != NULL) { | |
1825 | ||
1826 | spin_lock(&dcache_lock); | |
1827 | spin_lock(&proc_dentry->d_lock); | |
1828 | if (!d_unhashed(proc_dentry)) { | |
1829 | dget_locked(proc_dentry); | |
1830 | __d_drop(proc_dentry); | |
1831 | spin_unlock(&proc_dentry->d_lock); | |
1832 | } else { | |
1833 | spin_unlock(&proc_dentry->d_lock); | |
1834 | proc_dentry = NULL; | |
1835 | } | |
1836 | spin_unlock(&dcache_lock); | |
1837 | } | |
1838 | return proc_dentry; | |
1839 | } | |
1840 | ||
1841 | /** | |
4dc3b16b | 1842 | * proc_pid_flush - recover memory used by stale /proc/@pid/x entries |
67be2dd1 | 1843 | * @proc_dentry: directoy to prune. |
1da177e4 LT |
1844 | * |
1845 | * Shrink the /proc directory that was used by the just killed thread. | |
1846 | */ | |
1847 | ||
1848 | void proc_pid_flush(struct dentry *proc_dentry) | |
1849 | { | |
1850 | might_sleep(); | |
1851 | if(proc_dentry != NULL) { | |
1852 | shrink_dcache_parent(proc_dentry); | |
1853 | dput(proc_dentry); | |
1854 | } | |
1855 | } | |
1856 | ||
1857 | /* SMP-safe */ | |
1858 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) | |
1859 | { | |
1860 | struct task_struct *task; | |
1861 | struct inode *inode; | |
1862 | struct proc_inode *ei; | |
1863 | unsigned tgid; | |
1864 | int died; | |
1865 | ||
1866 | if (dentry->d_name.len == 4 && !memcmp(dentry->d_name.name,"self",4)) { | |
1867 | inode = new_inode(dir->i_sb); | |
1868 | if (!inode) | |
1869 | return ERR_PTR(-ENOMEM); | |
1870 | ei = PROC_I(inode); | |
1871 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
1872 | inode->i_ino = fake_ino(0, PROC_TGID_INO); | |
1873 | ei->pde = NULL; | |
1874 | inode->i_mode = S_IFLNK|S_IRWXUGO; | |
1875 | inode->i_uid = inode->i_gid = 0; | |
1876 | inode->i_size = 64; | |
1877 | inode->i_op = &proc_self_inode_operations; | |
1878 | d_add(dentry, inode); | |
1879 | return NULL; | |
1880 | } | |
1881 | tgid = name_to_int(dentry); | |
1882 | if (tgid == ~0U) | |
1883 | goto out; | |
1884 | ||
1885 | read_lock(&tasklist_lock); | |
1886 | task = find_task_by_pid(tgid); | |
1887 | if (task) | |
1888 | get_task_struct(task); | |
1889 | read_unlock(&tasklist_lock); | |
1890 | if (!task) | |
1891 | goto out; | |
1892 | ||
1893 | inode = proc_pid_make_inode(dir->i_sb, task, PROC_TGID_INO); | |
1894 | ||
1895 | ||
1896 | if (!inode) { | |
1897 | put_task_struct(task); | |
1898 | goto out; | |
1899 | } | |
1900 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
1901 | inode->i_op = &proc_tgid_base_inode_operations; | |
1902 | inode->i_fop = &proc_tgid_base_operations; | |
1da177e4 | 1903 | inode->i_flags|=S_IMMUTABLE; |
bcf88e11 DD |
1904 | #ifdef CONFIG_SECURITY |
1905 | inode->i_nlink = 5; | |
1906 | #else | |
1907 | inode->i_nlink = 4; | |
1908 | #endif | |
1da177e4 LT |
1909 | |
1910 | dentry->d_op = &pid_base_dentry_operations; | |
1911 | ||
1912 | died = 0; | |
1913 | d_add(dentry, inode); | |
1914 | spin_lock(&task->proc_lock); | |
1915 | task->proc_dentry = dentry; | |
1916 | if (!pid_alive(task)) { | |
1917 | dentry = proc_pid_unhash(task); | |
1918 | died = 1; | |
1919 | } | |
1920 | spin_unlock(&task->proc_lock); | |
1921 | ||
1922 | put_task_struct(task); | |
1923 | if (died) { | |
1924 | proc_pid_flush(dentry); | |
1925 | goto out; | |
1926 | } | |
1927 | return NULL; | |
1928 | out: | |
1929 | return ERR_PTR(-ENOENT); | |
1930 | } | |
1931 | ||
1932 | /* SMP-safe */ | |
1933 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) | |
1934 | { | |
1935 | struct task_struct *task; | |
1936 | struct task_struct *leader = proc_task(dir); | |
1937 | struct inode *inode; | |
1938 | unsigned tid; | |
1939 | ||
1940 | tid = name_to_int(dentry); | |
1941 | if (tid == ~0U) | |
1942 | goto out; | |
1943 | ||
1944 | read_lock(&tasklist_lock); | |
1945 | task = find_task_by_pid(tid); | |
1946 | if (task) | |
1947 | get_task_struct(task); | |
1948 | read_unlock(&tasklist_lock); | |
1949 | if (!task) | |
1950 | goto out; | |
1951 | if (leader->tgid != task->tgid) | |
1952 | goto out_drop_task; | |
1953 | ||
1954 | inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_INO); | |
1955 | ||
1956 | ||
1957 | if (!inode) | |
1958 | goto out_drop_task; | |
1959 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
1960 | inode->i_op = &proc_tid_base_inode_operations; | |
1961 | inode->i_fop = &proc_tid_base_operations; | |
1da177e4 | 1962 | inode->i_flags|=S_IMMUTABLE; |
bcf88e11 DD |
1963 | #ifdef CONFIG_SECURITY |
1964 | inode->i_nlink = 4; | |
1965 | #else | |
1966 | inode->i_nlink = 3; | |
1967 | #endif | |
1da177e4 LT |
1968 | |
1969 | dentry->d_op = &pid_base_dentry_operations; | |
1970 | ||
1971 | d_add(dentry, inode); | |
1972 | ||
1973 | put_task_struct(task); | |
1974 | return NULL; | |
1975 | out_drop_task: | |
1976 | put_task_struct(task); | |
1977 | out: | |
1978 | return ERR_PTR(-ENOENT); | |
1979 | } | |
1980 | ||
1981 | #define PROC_NUMBUF 10 | |
1982 | #define PROC_MAXPIDS 20 | |
1983 | ||
1984 | /* | |
1985 | * Get a few tgid's to return for filldir - we need to hold the | |
1986 | * tasklist lock while doing this, and we must release it before | |
1987 | * we actually do the filldir itself, so we use a temp buffer.. | |
1988 | */ | |
1989 | static int get_tgid_list(int index, unsigned long version, unsigned int *tgids) | |
1990 | { | |
1991 | struct task_struct *p; | |
1992 | int nr_tgids = 0; | |
1993 | ||
1994 | index--; | |
1995 | read_lock(&tasklist_lock); | |
1996 | p = NULL; | |
1997 | if (version) { | |
1998 | p = find_task_by_pid(version); | |
1999 | if (p && !thread_group_leader(p)) | |
2000 | p = NULL; | |
2001 | } | |
2002 | ||
2003 | if (p) | |
2004 | index = 0; | |
2005 | else | |
2006 | p = next_task(&init_task); | |
2007 | ||
2008 | for ( ; p != &init_task; p = next_task(p)) { | |
2009 | int tgid = p->pid; | |
2010 | if (!pid_alive(p)) | |
2011 | continue; | |
2012 | if (--index >= 0) | |
2013 | continue; | |
2014 | tgids[nr_tgids] = tgid; | |
2015 | nr_tgids++; | |
2016 | if (nr_tgids >= PROC_MAXPIDS) | |
2017 | break; | |
2018 | } | |
2019 | read_unlock(&tasklist_lock); | |
2020 | return nr_tgids; | |
2021 | } | |
2022 | ||
2023 | /* | |
2024 | * Get a few tid's to return for filldir - we need to hold the | |
2025 | * tasklist lock while doing this, and we must release it before | |
2026 | * we actually do the filldir itself, so we use a temp buffer.. | |
2027 | */ | |
2028 | static int get_tid_list(int index, unsigned int *tids, struct inode *dir) | |
2029 | { | |
2030 | struct task_struct *leader_task = proc_task(dir); | |
2031 | struct task_struct *task = leader_task; | |
2032 | int nr_tids = 0; | |
2033 | ||
2034 | index -= 2; | |
2035 | read_lock(&tasklist_lock); | |
2036 | /* | |
2037 | * The starting point task (leader_task) might be an already | |
2038 | * unlinked task, which cannot be used to access the task-list | |
2039 | * via next_thread(). | |
2040 | */ | |
2041 | if (pid_alive(task)) do { | |
2042 | int tid = task->pid; | |
2043 | ||
2044 | if (--index >= 0) | |
2045 | continue; | |
f246315e DD |
2046 | if (tids != NULL) |
2047 | tids[nr_tids] = tid; | |
1da177e4 LT |
2048 | nr_tids++; |
2049 | if (nr_tids >= PROC_MAXPIDS) | |
2050 | break; | |
2051 | } while ((task = next_thread(task)) != leader_task); | |
2052 | read_unlock(&tasklist_lock); | |
2053 | return nr_tids; | |
2054 | } | |
2055 | ||
2056 | /* for the /proc/ directory itself, after non-process stuff has been done */ | |
2057 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2058 | { | |
2059 | unsigned int tgid_array[PROC_MAXPIDS]; | |
2060 | char buf[PROC_NUMBUF]; | |
2061 | unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; | |
2062 | unsigned int nr_tgids, i; | |
2063 | int next_tgid; | |
2064 | ||
2065 | if (!nr) { | |
2066 | ino_t ino = fake_ino(0,PROC_TGID_INO); | |
2067 | if (filldir(dirent, "self", 4, filp->f_pos, ino, DT_LNK) < 0) | |
2068 | return 0; | |
2069 | filp->f_pos++; | |
2070 | nr++; | |
2071 | } | |
2072 | ||
2073 | /* f_version caches the tgid value that the last readdir call couldn't | |
2074 | * return. lseek aka telldir automagically resets f_version to 0. | |
2075 | */ | |
2076 | next_tgid = filp->f_version; | |
2077 | filp->f_version = 0; | |
2078 | for (;;) { | |
2079 | nr_tgids = get_tgid_list(nr, next_tgid, tgid_array); | |
2080 | if (!nr_tgids) { | |
2081 | /* no more entries ! */ | |
2082 | break; | |
2083 | } | |
2084 | next_tgid = 0; | |
2085 | ||
2086 | /* do not use the last found pid, reserve it for next_tgid */ | |
2087 | if (nr_tgids == PROC_MAXPIDS) { | |
2088 | nr_tgids--; | |
2089 | next_tgid = tgid_array[nr_tgids]; | |
2090 | } | |
2091 | ||
2092 | for (i=0;i<nr_tgids;i++) { | |
2093 | int tgid = tgid_array[i]; | |
2094 | ino_t ino = fake_ino(tgid,PROC_TGID_INO); | |
2095 | unsigned long j = PROC_NUMBUF; | |
2096 | ||
2097 | do | |
2098 | buf[--j] = '0' + (tgid % 10); | |
2099 | while ((tgid /= 10) != 0); | |
2100 | ||
2101 | if (filldir(dirent, buf+j, PROC_NUMBUF-j, filp->f_pos, ino, DT_DIR) < 0) { | |
2102 | /* returning this tgid failed, save it as the first | |
2103 | * pid for the next readir call */ | |
2104 | filp->f_version = tgid_array[i]; | |
2105 | goto out; | |
2106 | } | |
2107 | filp->f_pos++; | |
2108 | nr++; | |
2109 | } | |
2110 | } | |
2111 | out: | |
2112 | return 0; | |
2113 | } | |
2114 | ||
2115 | /* for the /proc/TGID/task/ directories */ | |
2116 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2117 | { | |
2118 | unsigned int tid_array[PROC_MAXPIDS]; | |
2119 | char buf[PROC_NUMBUF]; | |
2120 | unsigned int nr_tids, i; | |
2121 | struct dentry *dentry = filp->f_dentry; | |
2122 | struct inode *inode = dentry->d_inode; | |
2123 | int retval = -ENOENT; | |
2124 | ino_t ino; | |
2125 | unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */ | |
2126 | ||
2127 | if (!pid_alive(proc_task(inode))) | |
2128 | goto out; | |
2129 | retval = 0; | |
2130 | ||
2131 | switch (pos) { | |
2132 | case 0: | |
2133 | ino = inode->i_ino; | |
2134 | if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0) | |
2135 | goto out; | |
2136 | pos++; | |
2137 | /* fall through */ | |
2138 | case 1: | |
2139 | ino = parent_ino(dentry); | |
2140 | if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0) | |
2141 | goto out; | |
2142 | pos++; | |
2143 | /* fall through */ | |
2144 | } | |
2145 | ||
2146 | nr_tids = get_tid_list(pos, tid_array, inode); | |
f246315e | 2147 | inode->i_nlink = pos + nr_tids; |
1da177e4 LT |
2148 | |
2149 | for (i = 0; i < nr_tids; i++) { | |
2150 | unsigned long j = PROC_NUMBUF; | |
2151 | int tid = tid_array[i]; | |
2152 | ||
2153 | ino = fake_ino(tid,PROC_TID_INO); | |
2154 | ||
2155 | do | |
2156 | buf[--j] = '0' + (tid % 10); | |
2157 | while ((tid /= 10) != 0); | |
2158 | ||
2159 | if (filldir(dirent, buf+j, PROC_NUMBUF-j, pos, ino, DT_DIR) < 0) | |
2160 | break; | |
2161 | pos++; | |
2162 | } | |
2163 | out: | |
2164 | filp->f_pos = pos; | |
2165 | return retval; | |
2166 | } |