1 // SPDX-License-Identifier: GPL-2.0
3 #include <linux/mm.h>
11 #include <linux/sched/mm.h>
17  * "non-shared". Shared memory may get counted more than once, for
18  * each process that owns it. Non-shared memory is counted
21 void task_mem(struct seq_file *m, struct mm_struct *mm)  in task_mem()  argument
23 	VMA_ITERATOR(vmi, mm, 0);  in task_mem()
26 	unsigned long bytes = 0, sbytes = 0, slack = 0, size;  in task_mem()
28 	mmap_read_lock(mm);  in task_mem()
32 		region = vma->vm_region;  in task_mem()
35 			size += region->vm_end - region->vm_start;  in task_mem()
37 			size = vma->vm_end - vma->vm_start;  in task_mem()
40 		if (atomic_read(&mm->mm_count) > 1 ||  in task_mem()
41 		    is_nommu_shared_mapping(vma->vm_flags)) {  in task_mem()
46 				slack = region->vm_end - vma->vm_end;  in task_mem()
50 	if (atomic_read(&mm->mm_count) > 1)  in task_mem()
51 		sbytes += kobjsize(mm);  in task_mem()
53 		bytes += kobjsize(mm);  in task_mem()
55 	if (current->fs && current->fs->users > 1)  in task_mem()
56 		sbytes += kobjsize(current->fs);  in task_mem()
58 		bytes += kobjsize(current->fs);  in task_mem()
60 	if (current->files && atomic_read(&current->files->count) > 1)  in task_mem()
61 		sbytes += kobjsize(current->files);  in task_mem()
63 		bytes += kobjsize(current->files);  in task_mem()
65 	if (current->sighand && refcount_read(&current->sighand->count) > 1)  in task_mem()
66 		sbytes += kobjsize(current->sighand);  in task_mem()
68 		bytes += kobjsize(current->sighand);  in task_mem()
72 	mmap_read_unlock(mm);  in task_mem()
81 unsigned long task_vsize(struct mm_struct *mm)  in task_vsize()  argument
83 	VMA_ITERATOR(vmi, mm, 0);  in task_vsize()
85 	unsigned long vsize = 0;  in task_vsize()
87 	mmap_read_lock(mm);  in task_vsize()
89 		vsize += vma->vm_end - vma->vm_start;  in task_vsize()
90 	mmap_read_unlock(mm);  in task_vsize()
94 unsigned long task_statm(struct mm_struct *mm,  in task_statm()  argument
98 	VMA_ITERATOR(vmi, mm, 0);  in task_statm()
101 	unsigned long size = kobjsize(mm);  in task_statm()
103 	mmap_read_lock(mm);  in task_statm()
106 		region = vma->vm_region;  in task_statm()
109 			size += region->vm_end - region->vm_start;  in task_statm()
113 	*text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))  in task_statm()
115 	*data = (PAGE_ALIGN(mm->start_stack) - (mm->start_data & PAGE_MASK))  in task_statm()
117 	mmap_read_unlock(mm);  in task_statm()
129 	struct mm_struct *mm = vma->vm_mm;  in nommu_vma_show()  local
130 	unsigned long ino = 0;  in nommu_vma_show()
132 	dev_t dev = 0;  in nommu_vma_show()
134 	unsigned long long pgoff = 0;  in nommu_vma_show()
136 	flags = vma->vm_flags;  in nommu_vma_show()
137 	file = vma->vm_file;  in nommu_vma_show()
140 		struct inode *inode = file_inode(vma->vm_file);  in nommu_vma_show()
141 		dev = inode->i_sb->s_dev;  in nommu_vma_show()
142 		ino = inode->i_ino;  in nommu_vma_show()
143 		pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT;  in nommu_vma_show()
146 	seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);  in nommu_vma_show()
148 		   "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",  in nommu_vma_show()
149 		   vma->vm_start,  in nommu_vma_show()
150 		   vma->vm_end,  in nommu_vma_show()
151 		   flags & VM_READ ? 'r' : '-',  in nommu_vma_show()
152 		   flags & VM_WRITE ? 'w' : '-',  in nommu_vma_show()
153 		   flags & VM_EXEC ? 'x' : '-',  in nommu_vma_show()
161 	} else if (mm && vma_is_initial_stack(vma)) {  in nommu_vma_show()
167 	return 0;  in nommu_vma_show()
181 	struct vm_area_struct *vma = vma_next(&priv->iter);  in proc_get_vma()
184 		*ppos = vma->vm_start;  in proc_get_vma()
186 		*ppos = -1UL;  in proc_get_vma()
194 	struct proc_maps_private *priv = m->private;  in m_start()
196 	struct mm_struct *mm;  in m_start()  local
199 	if (last_addr == -1UL)  in m_start()
202 	/* pin the task and mm whilst we play with them */  in m_start()
203 	priv->task = get_proc_task(priv->inode);  in m_start()
204 	if (!priv->task)  in m_start()
205 		return ERR_PTR(-ESRCH);  in m_start()
207 	mm = priv->mm;  in m_start()
208 	if (!mm || !mmget_not_zero(mm)) {  in m_start()
209 		put_task_struct(priv->task);  in m_start()
210 		priv->task = NULL;  in m_start()
214 	if (mmap_read_lock_killable(mm)) {  in m_start()
215 		mmput(mm);  in m_start()
216 		put_task_struct(priv->task);  in m_start()
217 		priv->task = NULL;  in m_start()
218 		return ERR_PTR(-EINTR);  in m_start()
221 	vma_iter_init(&priv->iter, mm, last_addr);  in m_start()
228 	struct proc_maps_private *priv = m->private;  in m_stop()
229 	struct mm_struct *mm = priv->mm;  in m_stop()  local
231 	if (!priv->task)  in m_stop()
234 	mmap_read_unlock(mm);  in m_stop()
235 	mmput(mm);  in m_stop()
236 	put_task_struct(priv->task);  in m_stop()
237 	priv->task = NULL;  in m_stop()
242 	return proc_get_vma(m->private, ppos);  in m_next()
259 		return -ENOMEM;  in maps_open()
261 	priv->inode = inode;  in maps_open()
262 	priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);  in maps_open()
263 	if (IS_ERR(priv->mm)) {  in maps_open()
264 		int err = PTR_ERR(priv->mm);  in maps_open()
270 	return 0;  in maps_open()
276 	struct seq_file *seq = file->private_data;  in map_release()
277 	struct proc_maps_private *priv = seq->private;  in map_release()
279 	if (priv->mm)  in map_release()
280 		mmdrop(priv->mm);  in map_release()