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Linus Torvalds1da177e2005-04-16 15:20:36 -07001
2#include <linux/mm.h>
3#include <linux/file.h>
Bryan Wueb280622008-05-04 23:12:55 +08004#include <linux/fdtable.h>
Al Viro5ad4e532009-03-29 19:50:06 -04005#include <linux/fs_struct.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006#include <linux/mount.h>
Kees Cook5096add2007-05-08 00:26:04 -07007#include <linux/ptrace.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09008#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/seq_file.h>
10#include "internal.h"
11
12/*
13 * Logic: we've got two memory sums for each process, "shared", and
Frederik Schwarzer025dfda2008-10-16 19:02:37 +020014 * "non-shared". Shared memory may get counted more than once, for
Linus Torvalds1da177e2005-04-16 15:20:36 -070015 * each process that owns it. Non-shared memory is counted
16 * accurately.
17 */
Eric W. Biedermandf5f8312008-02-08 04:18:33 -080018void task_mem(struct seq_file *m, struct mm_struct *mm)
Linus Torvalds1da177e2005-04-16 15:20:36 -070019{
David Howells8feae132009-01-08 12:04:47 +000020 struct vm_area_struct *vma;
David Howells38f71472009-01-08 12:04:47 +000021 struct vm_region *region;
David Howells8feae132009-01-08 12:04:47 +000022 struct rb_node *p;
David Howells38f71472009-01-08 12:04:47 +000023 unsigned long bytes = 0, sbytes = 0, slack = 0, size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25 down_read(&mm->mmap_sem);
David Howells8feae132009-01-08 12:04:47 +000026 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
27 vma = rb_entry(p, struct vm_area_struct, vm_rb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
David Howells8feae132009-01-08 12:04:47 +000029 bytes += kobjsize(vma);
David Howells38f71472009-01-08 12:04:47 +000030
31 region = vma->vm_region;
32 if (region) {
33 size = kobjsize(region);
34 size += region->vm_end - region->vm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -070035 } else {
David Howells38f71472009-01-08 12:04:47 +000036 size = vma->vm_end - vma->vm_start;
37 }
38
39 if (atomic_read(&mm->mm_count) > 1 ||
40 vma->vm_flags & VM_MAYSHARE) {
41 sbytes += size;
42 } else {
43 bytes += size;
44 if (region)
45 slack = region->vm_end - vma->vm_end;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 }
47 }
48
49 if (atomic_read(&mm->mm_count) > 1)
50 sbytes += kobjsize(mm);
51 else
52 bytes += kobjsize(mm);
53
Al Viro498052b2009-03-30 07:20:30 -040054 if (current->fs && current->fs->users > 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 sbytes += kobjsize(current->fs);
56 else
57 bytes += kobjsize(current->fs);
58
59 if (current->files && atomic_read(&current->files->count) > 1)
60 sbytes += kobjsize(current->files);
61 else
62 bytes += kobjsize(current->files);
63
64 if (current->sighand && atomic_read(&current->sighand->count) > 1)
65 sbytes += kobjsize(current->sighand);
66 else
67 bytes += kobjsize(current->sighand);
68
69 bytes += kobjsize(current); /* includes kernel stack */
70
Eric W. Biedermandf5f8312008-02-08 04:18:33 -080071 seq_printf(m,
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 "Mem:\t%8lu bytes\n"
73 "Slack:\t%8lu bytes\n"
74 "Shared:\t%8lu bytes\n",
75 bytes, slack, sbytes);
76
77 up_read(&mm->mmap_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078}
79
80unsigned long task_vsize(struct mm_struct *mm)
81{
David Howells8feae132009-01-08 12:04:47 +000082 struct vm_area_struct *vma;
83 struct rb_node *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 unsigned long vsize = 0;
85
86 down_read(&mm->mmap_sem);
David Howells8feae132009-01-08 12:04:47 +000087 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
88 vma = rb_entry(p, struct vm_area_struct, vm_rb);
David Howells38f71472009-01-08 12:04:47 +000089 vsize += vma->vm_end - vma->vm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 }
91 up_read(&mm->mmap_sem);
92 return vsize;
93}
94
Alexey Dobriyana2ade7b2011-01-12 17:00:32 -080095unsigned long task_statm(struct mm_struct *mm,
96 unsigned long *shared, unsigned long *text,
97 unsigned long *data, unsigned long *resident)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098{
David Howells8feae132009-01-08 12:04:47 +000099 struct vm_area_struct *vma;
David Howells38f71472009-01-08 12:04:47 +0000100 struct vm_region *region;
David Howells8feae132009-01-08 12:04:47 +0000101 struct rb_node *p;
Alexey Dobriyana2ade7b2011-01-12 17:00:32 -0800102 unsigned long size = kobjsize(mm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
104 down_read(&mm->mmap_sem);
David Howells8feae132009-01-08 12:04:47 +0000105 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
106 vma = rb_entry(p, struct vm_area_struct, vm_rb);
107 size += kobjsize(vma);
David Howells38f71472009-01-08 12:04:47 +0000108 region = vma->vm_region;
109 if (region) {
110 size += kobjsize(region);
111 size += region->vm_end - region->vm_start;
112 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 }
114
Steven J. Magnani7e1e0ef2009-12-14 18:00:04 -0800115 *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
116 >> PAGE_SHIFT;
117 *data = (PAGE_ALIGN(mm->start_stack) - (mm->start_data & PAGE_MASK))
118 >> PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 up_read(&mm->mmap_sem);
Steven J. Magnani7e1e0ef2009-12-14 18:00:04 -0800120 size >>= PAGE_SHIFT;
121 size += *text + *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 *resident = size;
123 return size;
124}
125
Mike Frysinger3c26c9d2010-06-29 15:05:17 -0700126static void pad_len_spaces(struct seq_file *m, int len)
127{
128 len = 25 + sizeof(void*) * 6 - len;
129 if (len < 1)
130 len = 1;
131 seq_printf(m, "%*c", len, ' ');
132}
133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134/*
David Howells8feae132009-01-08 12:04:47 +0000135 * display a single VMA to a sequenced file
136 */
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700137static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma,
138 int is_pid)
David Howells8feae132009-01-08 12:04:47 +0000139{
Mike Frysinger3c26c9d2010-06-29 15:05:17 -0700140 struct mm_struct *mm = vma->vm_mm;
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700141 struct proc_maps_private *priv = m->private;
David Howells8feae132009-01-08 12:04:47 +0000142 unsigned long ino = 0;
143 struct file *file;
144 dev_t dev = 0;
145 int flags, len;
KAMEZAWA Hiroyuki6260a4b2009-04-06 19:00:30 -0700146 unsigned long long pgoff = 0;
David Howells8feae132009-01-08 12:04:47 +0000147
148 flags = vma->vm_flags;
149 file = vma->vm_file;
150
151 if (file) {
152 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
153 dev = inode->i_sb->s_dev;
154 ino = inode->i_ino;
Nobuhiro Iwamatsu4c967292009-04-07 21:21:43 -0700155 pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
David Howells8feae132009-01-08 12:04:47 +0000156 }
157
158 seq_printf(m,
David Howells33e5d7692009-04-02 16:56:32 -0700159 "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
David Howells8feae132009-01-08 12:04:47 +0000160 vma->vm_start,
161 vma->vm_end,
162 flags & VM_READ ? 'r' : '-',
163 flags & VM_WRITE ? 'w' : '-',
164 flags & VM_EXEC ? 'x' : '-',
165 flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
KAMEZAWA Hiroyuki6260a4b2009-04-06 19:00:30 -0700166 pgoff,
David Howells8feae132009-01-08 12:04:47 +0000167 MAJOR(dev), MINOR(dev), ino, &len);
168
169 if (file) {
Mike Frysinger3c26c9d2010-06-29 15:05:17 -0700170 pad_len_spaces(m, len);
David Howells8feae132009-01-08 12:04:47 +0000171 seq_path(m, &file->f_path, "");
Mike Frysinger3c26c9d2010-06-29 15:05:17 -0700172 } else if (mm) {
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700173 pid_t tid = vm_is_stack(priv->task, vma, is_pid);
174
175 if (tid != 0) {
Mike Frysinger3c26c9d2010-06-29 15:05:17 -0700176 pad_len_spaces(m, len);
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700177 /*
178 * Thread stack in /proc/PID/task/TID/maps or
179 * the main process stack.
180 */
181 if (!is_pid || (vma->vm_start <= mm->start_stack &&
182 vma->vm_end >= mm->start_stack))
183 seq_printf(m, "[stack]");
184 else
185 seq_printf(m, "[stack:%d]", tid);
Mike Frysinger3c26c9d2010-06-29 15:05:17 -0700186 }
David Howells8feae132009-01-08 12:04:47 +0000187 }
188
189 seq_putc(m, '\n');
190 return 0;
191}
192
193/*
David Howellsdbf86852006-09-27 01:50:19 -0700194 * display mapping lines for a particular process's /proc/pid/maps
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 */
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700196static int show_map(struct seq_file *m, void *_p, int is_pid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197{
David Howells8feae132009-01-08 12:04:47 +0000198 struct rb_node *p = _p;
Kees Cook5096add2007-05-08 00:26:04 -0700199
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700200 return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb),
201 is_pid);
202}
203
204static int show_pid_map(struct seq_file *m, void *_p)
205{
206 return show_map(m, _p, 1);
207}
208
209static int show_tid_map(struct seq_file *m, void *_p)
210{
211 return show_map(m, _p, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212}
David Howellsdbf86852006-09-27 01:50:19 -0700213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214static void *m_start(struct seq_file *m, loff_t *pos)
215{
David Howellsdbf86852006-09-27 01:50:19 -0700216 struct proc_maps_private *priv = m->private;
David Howellsdbf86852006-09-27 01:50:19 -0700217 struct mm_struct *mm;
David Howells8feae132009-01-08 12:04:47 +0000218 struct rb_node *p;
David Howellsdbf86852006-09-27 01:50:19 -0700219 loff_t n = *pos;
220
221 /* pin the task and mm whilst we play with them */
222 priv->task = get_pid_task(priv->pid, PIDTYPE_PID);
223 if (!priv->task)
Al Viroec6fd8a2011-02-15 22:22:54 -0500224 return ERR_PTR(-ESRCH);
David Howellsdbf86852006-09-27 01:50:19 -0700225
Al Viro831830b2008-01-02 14:09:57 +0000226 mm = mm_for_maps(priv->task);
Al Viroec6fd8a2011-02-15 22:22:54 -0500227 if (!mm || IS_ERR(mm)) {
David Howellsdbf86852006-09-27 01:50:19 -0700228 put_task_struct(priv->task);
229 priv->task = NULL;
Al Viroec6fd8a2011-02-15 22:22:54 -0500230 return mm;
David Howellsdbf86852006-09-27 01:50:19 -0700231 }
Oleg Nesterov00f89d22009-07-10 03:27:38 +0200232 down_read(&mm->mmap_sem);
David Howellsdbf86852006-09-27 01:50:19 -0700233
David Howellsdbf86852006-09-27 01:50:19 -0700234 /* start from the Nth VMA */
David Howells8feae132009-01-08 12:04:47 +0000235 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p))
David Howellsdbf86852006-09-27 01:50:19 -0700236 if (n-- == 0)
David Howells8feae132009-01-08 12:04:47 +0000237 return p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 return NULL;
239}
David Howellsdbf86852006-09-27 01:50:19 -0700240
241static void m_stop(struct seq_file *m, void *_vml)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242{
David Howellsdbf86852006-09-27 01:50:19 -0700243 struct proc_maps_private *priv = m->private;
244
245 if (priv->task) {
246 struct mm_struct *mm = priv->task->mm;
247 up_read(&mm->mmap_sem);
248 mmput(mm);
249 put_task_struct(priv->task);
250 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251}
David Howellsdbf86852006-09-27 01:50:19 -0700252
David Howells8feae132009-01-08 12:04:47 +0000253static void *m_next(struct seq_file *m, void *_p, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254{
David Howells8feae132009-01-08 12:04:47 +0000255 struct rb_node *p = _p;
David Howellsdbf86852006-09-27 01:50:19 -0700256
257 (*pos)++;
David Howells8feae132009-01-08 12:04:47 +0000258 return p ? rb_next(p) : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259}
David Howellsdbf86852006-09-27 01:50:19 -0700260
Jan Engelhardt03a44822008-02-08 04:21:19 -0800261static const struct seq_operations proc_pid_maps_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 .start = m_start,
263 .next = m_next,
264 .stop = m_stop,
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700265 .show = show_pid_map
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266};
Eric W. Biederman662795d2006-06-26 00:25:48 -0700267
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700268static const struct seq_operations proc_tid_maps_ops = {
269 .start = m_start,
270 .next = m_next,
271 .stop = m_stop,
272 .show = show_tid_map
273};
274
275static int maps_open(struct inode *inode, struct file *file,
276 const struct seq_operations *ops)
Eric W. Biederman662795d2006-06-26 00:25:48 -0700277{
David Howellsdbf86852006-09-27 01:50:19 -0700278 struct proc_maps_private *priv;
279 int ret = -ENOMEM;
280
281 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
282 if (priv) {
283 priv->pid = proc_pid(inode);
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700284 ret = seq_open(file, ops);
David Howellsdbf86852006-09-27 01:50:19 -0700285 if (!ret) {
286 struct seq_file *m = file->private_data;
287 m->private = priv;
288 } else {
289 kfree(priv);
290 }
Eric W. Biederman662795d2006-06-26 00:25:48 -0700291 }
292 return ret;
293}
294
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700295static int pid_maps_open(struct inode *inode, struct file *file)
296{
297 return maps_open(inode, file, &proc_pid_maps_ops);
298}
299
300static int tid_maps_open(struct inode *inode, struct file *file)
301{
302 return maps_open(inode, file, &proc_tid_maps_ops);
303}
304
305const struct file_operations proc_pid_maps_operations = {
306 .open = pid_maps_open,
307 .read = seq_read,
308 .llseek = seq_lseek,
309 .release = seq_release_private,
310};
311
312const struct file_operations proc_tid_maps_operations = {
313 .open = tid_maps_open,
Eric W. Biederman662795d2006-06-26 00:25:48 -0700314 .read = seq_read,
315 .llseek = seq_lseek,
David Howellsdbf86852006-09-27 01:50:19 -0700316 .release = seq_release_private,
Eric W. Biederman662795d2006-06-26 00:25:48 -0700317};
318