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 */ 18 void 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 80 unsigned 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 95 unsigned 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 } 125 126 static pid_t pid_of_stack(struct proc_maps_private *priv, 127 struct vm_area_struct *vma, bool is_pid) 128 { 129 struct inode *inode = priv->inode; 130 struct task_struct *task; 131 pid_t ret = 0; 132 133 rcu_read_lock(); 134 task = pid_task(proc_pid(inode), PIDTYPE_PID); 135 if (task) { 136 task = task_of_stack(task, vma, is_pid); 137 if (task) 138 ret = task_pid_nr_ns(task, inode->i_sb->s_fs_info); 139 } 140 rcu_read_unlock(); 141 142 return ret; 143 } 144 145 /* 146 * display a single VMA to a sequenced file 147 */ 148 static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma, 149 int is_pid) 150 { 151 struct mm_struct *mm = vma->vm_mm; 152 struct proc_maps_private *priv = m->private; 153 unsigned long ino = 0; 154 struct file *file; 155 dev_t dev = 0; 156 int flags; 157 unsigned long long pgoff = 0; 158 159 flags = vma->vm_flags; 160 file = vma->vm_file; 161 162 if (file) { 163 struct inode *inode = file_inode(vma->vm_file); 164 dev = inode->i_sb->s_dev; 165 ino = inode->i_ino; 166 pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT; 167 } 168 169 seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); 170 seq_printf(m, 171 "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ", 172 vma->vm_start, 173 vma->vm_end, 174 flags & VM_READ ? 'r' : '-', 175 flags & VM_WRITE ? 'w' : '-', 176 flags & VM_EXEC ? 'x' : '-', 177 flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p', 178 pgoff, 179 MAJOR(dev), MINOR(dev), ino); 180 181 if (file) { 182 seq_pad(m, ' '); 183 seq_file_path(m, file, ""); 184 } else if (mm) { 185 pid_t tid = pid_of_stack(priv, vma, is_pid); 186 187 if (tid != 0) { 188 seq_pad(m, ' '); 189 /* 190 * Thread stack in /proc/PID/task/TID/maps or 191 * the main process stack. 192 */ 193 if (!is_pid || (vma->vm_start <= mm->start_stack && 194 vma->vm_end >= mm->start_stack)) 195 seq_printf(m, "[stack]"); 196 else 197 seq_printf(m, "[stack:%d]", tid); 198 } 199 } 200 201 seq_putc(m, '\n'); 202 return 0; 203 } 204 205 /* 206 * display mapping lines for a particular process's /proc/pid/maps 207 */ 208 static int show_map(struct seq_file *m, void *_p, int is_pid) 209 { 210 struct rb_node *p = _p; 211 212 return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb), 213 is_pid); 214 } 215 216 static int show_pid_map(struct seq_file *m, void *_p) 217 { 218 return show_map(m, _p, 1); 219 } 220 221 static int show_tid_map(struct seq_file *m, void *_p) 222 { 223 return show_map(m, _p, 0); 224 } 225 226 static void *m_start(struct seq_file *m, loff_t *pos) 227 { 228 struct proc_maps_private *priv = m->private; 229 struct mm_struct *mm; 230 struct rb_node *p; 231 loff_t n = *pos; 232 233 /* pin the task and mm whilst we play with them */ 234 priv->task = get_proc_task(priv->inode); 235 if (!priv->task) 236 return ERR_PTR(-ESRCH); 237 238 mm = priv->mm; 239 if (!mm || !atomic_inc_not_zero(&mm->mm_users)) 240 return NULL; 241 242 down_read(&mm->mmap_sem); 243 /* start from the Nth VMA */ 244 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) 245 if (n-- == 0) 246 return p; 247 248 up_read(&mm->mmap_sem); 249 mmput(mm); 250 return NULL; 251 } 252 253 static void m_stop(struct seq_file *m, void *_vml) 254 { 255 struct proc_maps_private *priv = m->private; 256 257 if (!IS_ERR_OR_NULL(_vml)) { 258 up_read(&priv->mm->mmap_sem); 259 mmput(priv->mm); 260 } 261 if (priv->task) { 262 put_task_struct(priv->task); 263 priv->task = NULL; 264 } 265 } 266 267 static void *m_next(struct seq_file *m, void *_p, loff_t *pos) 268 { 269 struct rb_node *p = _p; 270 271 (*pos)++; 272 return p ? rb_next(p) : NULL; 273 } 274 275 static const struct seq_operations proc_pid_maps_ops = { 276 .start = m_start, 277 .next = m_next, 278 .stop = m_stop, 279 .show = show_pid_map 280 }; 281 282 static const struct seq_operations proc_tid_maps_ops = { 283 .start = m_start, 284 .next = m_next, 285 .stop = m_stop, 286 .show = show_tid_map 287 }; 288 289 static int maps_open(struct inode *inode, struct file *file, 290 const struct seq_operations *ops) 291 { 292 struct proc_maps_private *priv; 293 294 priv = __seq_open_private(file, ops, sizeof(*priv)); 295 if (!priv) 296 return -ENOMEM; 297 298 priv->inode = inode; 299 priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); 300 if (IS_ERR(priv->mm)) { 301 int err = PTR_ERR(priv->mm); 302 303 seq_release_private(inode, file); 304 return err; 305 } 306 307 return 0; 308 } 309 310 311 static int map_release(struct inode *inode, struct file *file) 312 { 313 struct seq_file *seq = file->private_data; 314 struct proc_maps_private *priv = seq->private; 315 316 if (priv->mm) 317 mmdrop(priv->mm); 318 319 return seq_release_private(inode, file); 320 } 321 322 static int pid_maps_open(struct inode *inode, struct file *file) 323 { 324 return maps_open(inode, file, &proc_pid_maps_ops); 325 } 326 327 static int tid_maps_open(struct inode *inode, struct file *file) 328 { 329 return maps_open(inode, file, &proc_tid_maps_ops); 330 } 331 332 const struct file_operations proc_pid_maps_operations = { 333 .open = pid_maps_open, 334 .read = seq_read, 335 .llseek = seq_lseek, 336 .release = map_release, 337 }; 338 339 const struct file_operations proc_tid_maps_operations = { 340 .open = tid_maps_open, 341 .read = seq_read, 342 .llseek = seq_lseek, 343 .release = map_release, 344 }; 345 346