Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/fdtable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/fs_struct.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/sched/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  * Logic: we've got two memory sums for each process, "shared", and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  * "non-shared". Shared memory may get counted more than once, for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  * each process that owns it. Non-shared memory is counted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * accurately.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) void task_mem(struct seq_file *m, struct mm_struct *mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	struct vm_area_struct *vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	struct vm_region *region;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	struct rb_node *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	unsigned long bytes = 0, sbytes = 0, slack = 0, size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)         
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	mmap_read_lock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 		vma = rb_entry(p, struct vm_area_struct, vm_rb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 		bytes += kobjsize(vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 		region = vma->vm_region;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 		if (region) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 			size = kobjsize(region);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 			size += region->vm_end - region->vm_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 			size = vma->vm_end - vma->vm_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		if (atomic_read(&mm->mm_count) > 1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		    vma->vm_flags & VM_MAYSHARE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 			sbytes += size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 			bytes += size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 			if (region)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 				slack = region->vm_end - vma->vm_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	if (atomic_read(&mm->mm_count) > 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		sbytes += kobjsize(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		bytes += kobjsize(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	if (current->fs && current->fs->users > 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		sbytes += kobjsize(current->fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		bytes += kobjsize(current->fs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	if (current->files && atomic_read(&current->files->count) > 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		sbytes += kobjsize(current->files);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		bytes += kobjsize(current->files);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (current->sighand && refcount_read(&current->sighand->count) > 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		sbytes += kobjsize(current->sighand);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		bytes += kobjsize(current->sighand);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	bytes += kobjsize(current); /* includes kernel stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	seq_printf(m,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		"Mem:\t%8lu bytes\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		"Slack:\t%8lu bytes\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		"Shared:\t%8lu bytes\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		bytes, slack, sbytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	mmap_read_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) unsigned long task_vsize(struct mm_struct *mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	struct vm_area_struct *vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	struct rb_node *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	unsigned long vsize = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	mmap_read_lock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		vma = rb_entry(p, struct vm_area_struct, vm_rb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		vsize += vma->vm_end - vma->vm_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	mmap_read_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	return vsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) unsigned long task_statm(struct mm_struct *mm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 			 unsigned long *shared, unsigned long *text,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 			 unsigned long *data, unsigned long *resident)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	struct vm_area_struct *vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	struct vm_region *region;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	struct rb_node *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	unsigned long size = kobjsize(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	mmap_read_lock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		vma = rb_entry(p, struct vm_area_struct, vm_rb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		size += kobjsize(vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		region = vma->vm_region;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		if (region) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 			size += kobjsize(region);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 			size += region->vm_end - region->vm_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	*text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		>> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	*data = (PAGE_ALIGN(mm->start_stack) - (mm->start_data & PAGE_MASK))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		>> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	mmap_read_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	size >>= PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	size += *text + *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	*resident = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	return size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) static int is_stack(struct vm_area_struct *vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	struct mm_struct *mm = vma->vm_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	 * We make no effort to guess what a given thread considers to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	 * its "stack".  It's not even well-defined for programs written
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	 * languages like Go.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	return vma->vm_start <= mm->start_stack &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		vma->vm_end >= mm->start_stack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)  * display a single VMA to a sequenced file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	struct mm_struct *mm = vma->vm_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	unsigned long ino = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	struct file *file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	dev_t dev = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	int flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	unsigned long long pgoff = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	flags = vma->vm_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	file = vma->vm_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	if (file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		struct inode *inode = file_inode(vma->vm_file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		dev = inode->i_sb->s_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		ino = inode->i_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	seq_printf(m,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		   "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		   vma->vm_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		   vma->vm_end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		   flags & VM_READ ? 'r' : '-',
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		   flags & VM_WRITE ? 'w' : '-',
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		   flags & VM_EXEC ? 'x' : '-',
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		   flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		   pgoff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		   MAJOR(dev), MINOR(dev), ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	if (file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		seq_pad(m, ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		seq_file_path(m, file, "");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	} else if (mm && is_stack(vma)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		seq_pad(m, ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		seq_puts(m, "[stack]");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	seq_putc(m, '\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)  * display mapping lines for a particular process's /proc/pid/maps
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) static int show_map(struct seq_file *m, void *_p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	struct rb_node *p = _p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) static void *m_start(struct seq_file *m, loff_t *pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	struct proc_maps_private *priv = m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	struct mm_struct *mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	struct rb_node *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	loff_t n = *pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	/* pin the task and mm whilst we play with them */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	priv->task = get_proc_task(priv->inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	if (!priv->task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		return ERR_PTR(-ESRCH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	mm = priv->mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	if (!mm || !mmget_not_zero(mm))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	if (mmap_read_lock_killable(mm)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		mmput(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		return ERR_PTR(-EINTR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	/* start from the Nth VMA */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		if (n-- == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 			return p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	mmap_read_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	mmput(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) static void m_stop(struct seq_file *m, void *_vml)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	struct proc_maps_private *priv = m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	if (!IS_ERR_OR_NULL(_vml)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		mmap_read_unlock(priv->mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		mmput(priv->mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	if (priv->task) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		put_task_struct(priv->task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		priv->task = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) static void *m_next(struct seq_file *m, void *_p, loff_t *pos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	struct rb_node *p = _p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	(*pos)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	return p ? rb_next(p) : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) static const struct seq_operations proc_pid_maps_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	.start	= m_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	.next	= m_next,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	.stop	= m_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	.show	= show_map
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) static int maps_open(struct inode *inode, struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		     const struct seq_operations *ops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	struct proc_maps_private *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	priv = __seq_open_private(file, ops, sizeof(*priv));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	if (!priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	priv->inode = inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	if (IS_ERR(priv->mm)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		int err = PTR_ERR(priv->mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		seq_release_private(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) static int map_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	struct seq_file *seq = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	struct proc_maps_private *priv = seq->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	if (priv->mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		mmdrop(priv->mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	return seq_release_private(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) static int pid_maps_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	return maps_open(inode, file, &proc_pid_maps_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) const struct file_operations proc_pid_maps_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	.open		= pid_maps_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	.read		= seq_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	.llseek		= seq_lseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	.release	= map_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)