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1
2#include <linux/mm.h>
3#include <linux/file.h>
4#include <linux/fdtable.h>
5#include <linux/fs_struct.h>
6#include <linux/mount.h>
7#include <linux/ptrace.h>
8#include <linux/slab.h>
9#include <linux/seq_file.h>
10#include "internal.h"
11
12/*
13 * Logic: we've got two memory sums for each process, "shared", and
14 * "non-shared". Shared memory may get counted more than once, for
15 * each process that owns it. Non-shared memory is counted
16 * accurately.
17 */
18void task_mem(struct seq_file *m, struct mm_struct *mm)
19{
20 struct vm_area_struct *vma;
21 struct vm_region *region;
22 struct rb_node *p;
23 unsigned long bytes = 0, sbytes = 0, slack = 0, size;
24
25 down_read(&mm->mmap_sem);
26 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
27 vma = rb_entry(p, struct vm_area_struct, vm_rb);
28
29 bytes += kobjsize(vma);
30
31 region = vma->vm_region;
32 if (region) {
33 size = kobjsize(region);
34 size += region->vm_end - region->vm_start;
35 } else {
36 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;
46 }
47 }
48
49 if (atomic_read(&mm->mm_count) > 1)
50 sbytes += kobjsize(mm);
51 else
52 bytes += kobjsize(mm);
53
54 if (current->fs && current->fs->users > 1)
55 sbytes += kobjsize(current->fs);
56 else
57 bytes += kobjsize(current->fs);
58
59 if (current->files && atomic_read(¤t->files->count) > 1)
60 sbytes += kobjsize(current->files);
61 else
62 bytes += kobjsize(current->files);
63
64 if (current->sighand && atomic_read(¤t->sighand->count) > 1)
65 sbytes += kobjsize(current->sighand);
66 else
67 bytes += kobjsize(current->sighand);
68
69 bytes += kobjsize(current); /* includes kernel stack */
70
71 seq_printf(m,
72 "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);
78}
79
80unsigned long task_vsize(struct mm_struct *mm)
81{
82 struct vm_area_struct *vma;
83 struct rb_node *p;
84 unsigned long vsize = 0;
85
86 down_read(&mm->mmap_sem);
87 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
88 vma = rb_entry(p, struct vm_area_struct, vm_rb);
89 vsize += vma->vm_end - vma->vm_start;
90 }
91 up_read(&mm->mmap_sem);
92 return vsize;
93}
94
95unsigned long task_statm(struct mm_struct *mm,
96 unsigned long *shared, unsigned long *text,
97 unsigned long *data, unsigned long *resident)
98{
99 struct vm_area_struct *vma;
100 struct vm_region *region;
101 struct rb_node *p;
102 unsigned long size = kobjsize(mm);
103
104 down_read(&mm->mmap_sem);
105 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);
108 region = vma->vm_region;
109 if (region) {
110 size += kobjsize(region);
111 size += region->vm_end - region->vm_start;
112 }
113 }
114
115 *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;
119 up_read(&mm->mmap_sem);
120 size >>= PAGE_SHIFT;
121 size += *text + *data;
122 *resident = size;
123 return size;
124}
125
126static 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
134/*
135 * display a single VMA to a sequenced file
136 */
137static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma,
138 int is_pid)
139{
140 struct mm_struct *mm = vma->vm_mm;
141 struct proc_maps_private *priv = m->private;
142 unsigned long ino = 0;
143 struct file *file;
144 dev_t dev = 0;
145 int flags, len;
146 unsigned long long pgoff = 0;
147
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;
155 pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
156 }
157
158 seq_printf(m,
159 "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
160 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',
166 pgoff,
167 MAJOR(dev), MINOR(dev), ino, &len);
168
169 if (file) {
170 pad_len_spaces(m, len);
171 seq_path(m, &file->f_path, "");
172 } else if (mm) {
173 pid_t tid = vm_is_stack(priv->task, vma, is_pid);
174
175 if (tid != 0) {
176 pad_len_spaces(m, len);
177 /*
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);
186 }
187 }
188
189 seq_putc(m, '\n');
190 return 0;
191}
192
193/*
194 * display mapping lines for a particular process's /proc/pid/maps
195 */
196static int show_map(struct seq_file *m, void *_p, int is_pid)
197{
198 struct rb_node *p = _p;
199
200 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);
212}
213
214static void *m_start(struct seq_file *m, loff_t *pos)
215{
216 struct proc_maps_private *priv = m->private;
217 struct mm_struct *mm;
218 struct rb_node *p;
219 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)
224 return ERR_PTR(-ESRCH);
225
226 mm = mm_access(priv->task, PTRACE_MODE_READ);
227 if (!mm || IS_ERR(mm)) {
228 put_task_struct(priv->task);
229 priv->task = NULL;
230 return mm;
231 }
232 down_read(&mm->mmap_sem);
233
234 /* start from the Nth VMA */
235 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p))
236 if (n-- == 0)
237 return p;
238 return NULL;
239}
240
241static void m_stop(struct seq_file *m, void *_vml)
242{
243 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 }
251}
252
253static void *m_next(struct seq_file *m, void *_p, loff_t *pos)
254{
255 struct rb_node *p = _p;
256
257 (*pos)++;
258 return p ? rb_next(p) : NULL;
259}
260
261static const struct seq_operations proc_pid_maps_ops = {
262 .start = m_start,
263 .next = m_next,
264 .stop = m_stop,
265 .show = show_pid_map
266};
267
268static 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)
277{
278 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);
284 ret = seq_open(file, ops);
285 if (!ret) {
286 struct seq_file *m = file->private_data;
287 m->private = priv;
288 } else {
289 kfree(priv);
290 }
291 }
292 return ret;
293}
294
295static 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,
314 .read = seq_read,
315 .llseek = seq_lseek,
316 .release = seq_release_private,
317};
318
1// SPDX-License-Identifier: GPL-2.0
2
3#include <linux/mm.h>
4#include <linux/file.h>
5#include <linux/fdtable.h>
6#include <linux/fs_struct.h>
7#include <linux/mount.h>
8#include <linux/ptrace.h>
9#include <linux/slab.h>
10#include <linux/seq_file.h>
11#include <linux/sched/mm.h>
12
13#include "internal.h"
14
15/*
16 * Logic: we've got two memory sums for each process, "shared", and
17 * "non-shared". Shared memory may get counted more than once, for
18 * each process that owns it. Non-shared memory is counted
19 * accurately.
20 */
21void task_mem(struct seq_file *m, struct mm_struct *mm)
22{
23 VMA_ITERATOR(vmi, mm, 0);
24 struct vm_area_struct *vma;
25 struct vm_region *region;
26 unsigned long bytes = 0, sbytes = 0, slack = 0, size;
27
28 mmap_read_lock(mm);
29 for_each_vma(vmi, vma) {
30 bytes += kobjsize(vma);
31
32 region = vma->vm_region;
33 if (region) {
34 size = kobjsize(region);
35 size += region->vm_end - region->vm_start;
36 } else {
37 size = vma->vm_end - vma->vm_start;
38 }
39
40 if (atomic_read(&mm->mm_count) > 1 ||
41 vma->vm_flags & VM_MAYSHARE) {
42 sbytes += size;
43 } else {
44 bytes += size;
45 if (region)
46 slack = region->vm_end - vma->vm_end;
47 }
48 }
49
50 if (atomic_read(&mm->mm_count) > 1)
51 sbytes += kobjsize(mm);
52 else
53 bytes += kobjsize(mm);
54
55 if (current->fs && current->fs->users > 1)
56 sbytes += kobjsize(current->fs);
57 else
58 bytes += kobjsize(current->fs);
59
60 if (current->files && atomic_read(¤t->files->count) > 1)
61 sbytes += kobjsize(current->files);
62 else
63 bytes += kobjsize(current->files);
64
65 if (current->sighand && refcount_read(¤t->sighand->count) > 1)
66 sbytes += kobjsize(current->sighand);
67 else
68 bytes += kobjsize(current->sighand);
69
70 bytes += kobjsize(current); /* includes kernel stack */
71
72 seq_printf(m,
73 "Mem:\t%8lu bytes\n"
74 "Slack:\t%8lu bytes\n"
75 "Shared:\t%8lu bytes\n",
76 bytes, slack, sbytes);
77
78 mmap_read_unlock(mm);
79}
80
81unsigned long task_vsize(struct mm_struct *mm)
82{
83 VMA_ITERATOR(vmi, mm, 0);
84 struct vm_area_struct *vma;
85 unsigned long vsize = 0;
86
87 mmap_read_lock(mm);
88 for_each_vma(vmi, vma)
89 vsize += vma->vm_end - vma->vm_start;
90 mmap_read_unlock(mm);
91 return vsize;
92}
93
94unsigned long task_statm(struct mm_struct *mm,
95 unsigned long *shared, unsigned long *text,
96 unsigned long *data, unsigned long *resident)
97{
98 VMA_ITERATOR(vmi, mm, 0);
99 struct vm_area_struct *vma;
100 struct vm_region *region;
101 unsigned long size = kobjsize(mm);
102
103 mmap_read_lock(mm);
104 for_each_vma(vmi, vma) {
105 size += kobjsize(vma);
106 region = vma->vm_region;
107 if (region) {
108 size += kobjsize(region);
109 size += region->vm_end - region->vm_start;
110 }
111 }
112
113 *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
114 >> PAGE_SHIFT;
115 *data = (PAGE_ALIGN(mm->start_stack) - (mm->start_data & PAGE_MASK))
116 >> PAGE_SHIFT;
117 mmap_read_unlock(mm);
118 size >>= PAGE_SHIFT;
119 size += *text + *data;
120 *resident = size;
121 return size;
122}
123
124static int is_stack(struct vm_area_struct *vma)
125{
126 struct mm_struct *mm = vma->vm_mm;
127
128 /*
129 * We make no effort to guess what a given thread considers to be
130 * its "stack". It's not even well-defined for programs written
131 * languages like Go.
132 */
133 return vma->vm_start <= mm->start_stack &&
134 vma->vm_end >= mm->start_stack;
135}
136
137/*
138 * display a single VMA to a sequenced file
139 */
140static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
141{
142 struct mm_struct *mm = vma->vm_mm;
143 unsigned long ino = 0;
144 struct file *file;
145 dev_t dev = 0;
146 int flags;
147 unsigned long long pgoff = 0;
148
149 flags = vma->vm_flags;
150 file = vma->vm_file;
151
152 if (file) {
153 struct inode *inode = file_inode(vma->vm_file);
154 dev = inode->i_sb->s_dev;
155 ino = inode->i_ino;
156 pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
157 }
158
159 seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
160 seq_printf(m,
161 "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
162 vma->vm_start,
163 vma->vm_end,
164 flags & VM_READ ? 'r' : '-',
165 flags & VM_WRITE ? 'w' : '-',
166 flags & VM_EXEC ? 'x' : '-',
167 flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
168 pgoff,
169 MAJOR(dev), MINOR(dev), ino);
170
171 if (file) {
172 seq_pad(m, ' ');
173 seq_file_path(m, file, "");
174 } else if (mm && is_stack(vma)) {
175 seq_pad(m, ' ');
176 seq_puts(m, "[stack]");
177 }
178
179 seq_putc(m, '\n');
180 return 0;
181}
182
183/*
184 * display mapping lines for a particular process's /proc/pid/maps
185 */
186static int show_map(struct seq_file *m, void *_p)
187{
188 return nommu_vma_show(m, _p);
189}
190
191static void *m_start(struct seq_file *m, loff_t *pos)
192{
193 struct proc_maps_private *priv = m->private;
194 struct mm_struct *mm;
195 struct vm_area_struct *vma;
196 unsigned long addr = *pos;
197
198 /* See m_next(). Zero at the start or after lseek. */
199 if (addr == -1UL)
200 return NULL;
201
202 /* pin the task and mm whilst we play with them */
203 priv->task = get_proc_task(priv->inode);
204 if (!priv->task)
205 return ERR_PTR(-ESRCH);
206
207 mm = priv->mm;
208 if (!mm || !mmget_not_zero(mm))
209 return NULL;
210
211 if (mmap_read_lock_killable(mm)) {
212 mmput(mm);
213 return ERR_PTR(-EINTR);
214 }
215
216 /* start the next element from addr */
217 vma = find_vma(mm, addr);
218 if (vma)
219 return vma;
220
221 mmap_read_unlock(mm);
222 mmput(mm);
223 return NULL;
224}
225
226static void m_stop(struct seq_file *m, void *_vml)
227{
228 struct proc_maps_private *priv = m->private;
229
230 if (!IS_ERR_OR_NULL(_vml)) {
231 mmap_read_unlock(priv->mm);
232 mmput(priv->mm);
233 }
234 if (priv->task) {
235 put_task_struct(priv->task);
236 priv->task = NULL;
237 }
238}
239
240static void *m_next(struct seq_file *m, void *_p, loff_t *pos)
241{
242 struct vm_area_struct *vma = _p;
243
244 *pos = vma->vm_end;
245 return find_vma(vma->vm_mm, vma->vm_end);
246}
247
248static const struct seq_operations proc_pid_maps_ops = {
249 .start = m_start,
250 .next = m_next,
251 .stop = m_stop,
252 .show = show_map
253};
254
255static int maps_open(struct inode *inode, struct file *file,
256 const struct seq_operations *ops)
257{
258 struct proc_maps_private *priv;
259
260 priv = __seq_open_private(file, ops, sizeof(*priv));
261 if (!priv)
262 return -ENOMEM;
263
264 priv->inode = inode;
265 priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
266 if (IS_ERR(priv->mm)) {
267 int err = PTR_ERR(priv->mm);
268
269 seq_release_private(inode, file);
270 return err;
271 }
272
273 return 0;
274}
275
276
277static int map_release(struct inode *inode, struct file *file)
278{
279 struct seq_file *seq = file->private_data;
280 struct proc_maps_private *priv = seq->private;
281
282 if (priv->mm)
283 mmdrop(priv->mm);
284
285 return seq_release_private(inode, file);
286}
287
288static int pid_maps_open(struct inode *inode, struct file *file)
289{
290 return maps_open(inode, file, &proc_pid_maps_ops);
291}
292
293const struct file_operations proc_pid_maps_operations = {
294 .open = pid_maps_open,
295 .read = seq_read,
296 .llseek = seq_lseek,
297 .release = map_release,
298};
299