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)  * fs/proc_namespace.c - handling of /proc/<pid>/{mounts,mountinfo,mountstats}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * In fact, that's a piece of procfs; it's *almost* isolated from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * the rest of fs/proc, but has rather close relationships with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * fs/namespace.c, thus here instead of fs/proc
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/mnt_namespace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/nsproxy.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/fs_struct.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/sched/task.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include "proc/internal.h" /* only for get_proc_task() in ->open() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include "pnode.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) static __poll_t mounts_poll(struct file *file, poll_table *wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	struct seq_file *m = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	struct proc_mounts *p = m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	struct mnt_namespace *ns = p->ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	__poll_t res = EPOLLIN | EPOLLRDNORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	int event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	poll_wait(file, &p->ns->poll, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	event = READ_ONCE(ns->event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	if (m->poll_event != event) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 		m->poll_event = event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 		res |= EPOLLERR | EPOLLPRI;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) struct proc_fs_opts {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	int flag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	const char *str;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) static int show_sb_opts(struct seq_file *m, struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	static const struct proc_fs_opts fs_opts[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		{ SB_SYNCHRONOUS, ",sync" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		{ SB_DIRSYNC, ",dirsync" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		{ SB_MANDLOCK, ",mand" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		{ SB_LAZYTIME, ",lazytime" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		{ 0, NULL }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	const struct proc_fs_opts *fs_infop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	for (fs_infop = fs_opts; fs_infop->flag; fs_infop++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		if (sb->s_flags & fs_infop->flag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 			seq_puts(m, fs_infop->str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	return security_sb_show_options(m, sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) static void show_mnt_opts(struct seq_file *m, struct vfsmount *mnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	static const struct proc_fs_opts mnt_opts[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		{ MNT_NOSUID, ",nosuid" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		{ MNT_NODEV, ",nodev" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		{ MNT_NOEXEC, ",noexec" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		{ MNT_NOATIME, ",noatime" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		{ MNT_NODIRATIME, ",nodiratime" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		{ MNT_RELATIME, ",relatime" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		{ MNT_NOSYMFOLLOW, ",nosymfollow" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		{ 0, NULL }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	const struct proc_fs_opts *fs_infop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	for (fs_infop = mnt_opts; fs_infop->flag; fs_infop++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		if (mnt->mnt_flags & fs_infop->flag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 			seq_puts(m, fs_infop->str);
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) static inline void mangle(struct seq_file *m, const char *s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	seq_escape(m, s, " \t\n\\");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) static void show_type(struct seq_file *m, struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	mangle(m, sb->s_type->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	if (sb->s_subtype) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		seq_putc(m, '.');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		mangle(m, sb->s_subtype);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	}
^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) static int show_vfsmnt(struct seq_file *m, struct vfsmount *mnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	struct proc_mounts *p = m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	struct mount *r = real_mount(mnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	struct super_block *sb = mnt_path.dentry->d_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	if (sb->s_op->show_devname) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		err = sb->s_op->show_devname(m, mnt_path.dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		mangle(m, r->mnt_devname ? r->mnt_devname : "none");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	seq_putc(m, ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	/* mountpoints outside of chroot jail will give SEQ_SKIP on this */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	err = seq_path_root(m, &mnt_path, &p->root, " \t\n\\");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	seq_putc(m, ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	show_type(m, sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	seq_puts(m, __mnt_is_readonly(mnt) ? " ro" : " rw");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	err = show_sb_opts(m, sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	show_mnt_opts(m, mnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	if (sb->s_op->show_options)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		err = sb->s_op->show_options(m, mnt_path.dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	seq_puts(m, " 0 0\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static int show_mountinfo(struct seq_file *m, struct vfsmount *mnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	struct proc_mounts *p = m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	struct mount *r = real_mount(mnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	struct super_block *sb = mnt->mnt_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	seq_printf(m, "%i %i %u:%u ", r->mnt_id, r->mnt_parent->mnt_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		   MAJOR(sb->s_dev), MINOR(sb->s_dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	if (sb->s_op->show_path) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		err = sb->s_op->show_path(m, mnt->mnt_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		seq_dentry(m, mnt->mnt_root, " \t\n\\");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	seq_putc(m, ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	/* mountpoints outside of chroot jail will give SEQ_SKIP on this */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	err = seq_path_root(m, &mnt_path, &p->root, " \t\n\\");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	seq_puts(m, mnt->mnt_flags & MNT_READONLY ? " ro" : " rw");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	show_mnt_opts(m, mnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	/* Tagged fields ("foo:X" or "bar") */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	if (IS_MNT_SHARED(r))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		seq_printf(m, " shared:%i", r->mnt_group_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	if (IS_MNT_SLAVE(r)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		int master = r->mnt_master->mnt_group_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		int dom = get_dominating_id(r, &p->root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		seq_printf(m, " master:%i", master);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		if (dom && dom != master)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 			seq_printf(m, " propagate_from:%i", dom);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	if (IS_MNT_UNBINDABLE(r))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		seq_puts(m, " unbindable");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	/* Filesystem specific data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	seq_puts(m, " - ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	show_type(m, sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	seq_putc(m, ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	if (sb->s_op->show_devname) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		err = sb->s_op->show_devname(m, mnt->mnt_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		mangle(m, r->mnt_devname ? r->mnt_devname : "none");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	seq_puts(m, sb_rdonly(sb) ? " ro" : " rw");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	err = show_sb_opts(m, sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	if (sb->s_op->show_options)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		err = sb->s_op->show_options(m, mnt->mnt_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	seq_putc(m, '\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) static int show_vfsstat(struct seq_file *m, struct vfsmount *mnt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	struct proc_mounts *p = m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	struct mount *r = real_mount(mnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	struct super_block *sb = mnt_path.dentry->d_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	/* device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	if (sb->s_op->show_devname) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		seq_puts(m, "device ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		err = sb->s_op->show_devname(m, mnt_path.dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		if (r->mnt_devname) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 			seq_puts(m, "device ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 			mangle(m, r->mnt_devname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 			seq_puts(m, "no device");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	/* mount point */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	seq_puts(m, " mounted on ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	/* mountpoints outside of chroot jail will give SEQ_SKIP on this */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	err = seq_path_root(m, &mnt_path, &p->root, " \t\n\\");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	seq_putc(m, ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	/* file system type */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	seq_puts(m, "with fstype ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	show_type(m, sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	/* optional statistics */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	if (sb->s_op->show_stats) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		seq_putc(m, ' ');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		err = sb->s_op->show_stats(m, mnt_path.dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	seq_putc(m, '\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) static int mounts_open_common(struct inode *inode, struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			      int (*show)(struct seq_file *, struct vfsmount *))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	struct task_struct *task = get_proc_task(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	struct nsproxy *nsp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	struct mnt_namespace *ns = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	struct path root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	struct proc_mounts *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	struct seq_file *m;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	int ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	if (!task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	task_lock(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	nsp = task->nsproxy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	if (!nsp || !nsp->mnt_ns) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		task_unlock(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		put_task_struct(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	ns = nsp->mnt_ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	get_mnt_ns(ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	if (!task->fs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		task_unlock(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		put_task_struct(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		ret = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		goto err_put_ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	get_fs_root(task->fs, &root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	task_unlock(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	put_task_struct(task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	ret = seq_open_private(file, &mounts_op, sizeof(struct proc_mounts));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		goto err_put_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	m = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	m->poll_event = ns->event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	p = m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	p->ns = ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	p->root = root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	p->show = show;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	INIT_LIST_HEAD(&p->cursor.mnt_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	p->cursor.mnt.mnt_flags = MNT_CURSOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)  err_put_path:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	path_put(&root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)  err_put_ns:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	put_mnt_ns(ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)  err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	return ret;
^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) static int mounts_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	struct seq_file *m = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	struct proc_mounts *p = m->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	path_put(&p->root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	mnt_cursor_del(p->ns, &p->cursor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	put_mnt_ns(p->ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	return seq_release_private(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) static int mounts_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	return mounts_open_common(inode, file, show_vfsmnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) static int mountinfo_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	return mounts_open_common(inode, file, show_mountinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) static int mountstats_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	return mounts_open_common(inode, file, show_vfsstat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) const struct file_operations proc_mounts_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	.open		= mounts_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	.read_iter	= seq_read_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	.splice_read	= generic_file_splice_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	.llseek		= seq_lseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	.release	= mounts_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	.poll		= mounts_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) const struct file_operations proc_mountinfo_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	.open		= mountinfo_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	.read_iter	= seq_read_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	.splice_read	= generic_file_splice_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	.llseek		= seq_lseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	.release	= mounts_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	.poll		= mounts_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) const struct file_operations proc_mountstats_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	.open		= mountstats_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	.read_iter	= seq_read_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	.splice_read	= generic_file_splice_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	.llseek		= seq_lseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	.release	= mounts_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) };