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fs/proc_namespace.c
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// SPDX-License-Identifier: GPL-2.0 |
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/* * fs/proc_namespace.c - handling of /proc/<pid>/{mounts,mountinfo,mountstats} * * In fact, that's a piece of procfs; it's *almost* isolated from * the rest of fs/proc, but has rather close relationships with * fs/namespace.c, thus here instead of fs/proc * */ #include <linux/mnt_namespace.h> #include <linux/nsproxy.h> #include <linux/security.h> #include <linux/fs_struct.h> |
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#include <linux/sched/task.h> |
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#include "proc/internal.h" /* only for get_proc_task() in ->open() */ #include "pnode.h" #include "internal.h" |
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static __poll_t mounts_poll(struct file *file, poll_table *wait) |
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{ |
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struct seq_file *m = file->private_data; struct proc_mounts *p = m->private; |
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struct mnt_namespace *ns = p->ns; |
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__poll_t res = EPOLLIN | EPOLLRDNORM; |
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int event; |
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poll_wait(file, &p->ns->poll, wait); |
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event = READ_ONCE(ns->event); |
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if (m->poll_event != event) { m->poll_event = event; |
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res |= EPOLLERR | EPOLLPRI; |
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} |
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return res; } struct proc_fs_info { int flag; const char *str; }; static int show_sb_opts(struct seq_file *m, struct super_block *sb) { static const struct proc_fs_info fs_info[] = { |
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{ SB_SYNCHRONOUS, ",sync" }, { SB_DIRSYNC, ",dirsync" }, { SB_MANDLOCK, ",mand" }, { SB_LAZYTIME, ",lazytime" }, |
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{ 0, NULL } }; const struct proc_fs_info *fs_infop; for (fs_infop = fs_info; fs_infop->flag; fs_infop++) { if (sb->s_flags & fs_infop->flag) seq_puts(m, fs_infop->str); } return security_sb_show_options(m, sb); } static void show_mnt_opts(struct seq_file *m, struct vfsmount *mnt) { static const struct proc_fs_info mnt_info[] = { { MNT_NOSUID, ",nosuid" }, { MNT_NODEV, ",nodev" }, { MNT_NOEXEC, ",noexec" }, { MNT_NOATIME, ",noatime" }, { MNT_NODIRATIME, ",nodiratime" }, { MNT_RELATIME, ",relatime" }, { 0, NULL } }; const struct proc_fs_info *fs_infop; for (fs_infop = mnt_info; fs_infop->flag; fs_infop++) { if (mnt->mnt_flags & fs_infop->flag) seq_puts(m, fs_infop->str); } } static inline void mangle(struct seq_file *m, const char *s) { seq_escape(m, s, " \t \\"); } static void show_type(struct seq_file *m, struct super_block *sb) { mangle(m, sb->s_type->name); |
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if (sb->s_subtype) { |
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seq_putc(m, '.'); mangle(m, sb->s_subtype); } } static int show_vfsmnt(struct seq_file *m, struct vfsmount *mnt) { |
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struct proc_mounts *p = m->private; |
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struct mount *r = real_mount(mnt); |
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struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt }; |
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struct super_block *sb = mnt_path.dentry->d_sb; |
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int err; |
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if (sb->s_op->show_devname) { err = sb->s_op->show_devname(m, mnt_path.dentry); |
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if (err) goto out; } else { mangle(m, r->mnt_devname ? r->mnt_devname : "none"); } seq_putc(m, ' '); |
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/* mountpoints outside of chroot jail will give SEQ_SKIP on this */ err = seq_path_root(m, &mnt_path, &p->root, " \t \\"); if (err) goto out; |
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seq_putc(m, ' '); |
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show_type(m, sb); |
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seq_puts(m, __mnt_is_readonly(mnt) ? " ro" : " rw"); |
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err = show_sb_opts(m, sb); |
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if (err) goto out; show_mnt_opts(m, mnt); |
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if (sb->s_op->show_options) |
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err = sb->s_op->show_options(m, mnt_path.dentry); |
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seq_puts(m, " 0 0 "); out: return err; } static int show_mountinfo(struct seq_file *m, struct vfsmount *mnt) { |
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struct proc_mounts *p = m->private; |
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struct mount *r = real_mount(mnt); struct super_block *sb = mnt->mnt_sb; struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt }; |
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int err; |
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seq_printf(m, "%i %i %u:%u ", r->mnt_id, r->mnt_parent->mnt_id, MAJOR(sb->s_dev), MINOR(sb->s_dev)); |
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if (sb->s_op->show_path) { |
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err = sb->s_op->show_path(m, mnt->mnt_root); |
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if (err) goto out; } else { |
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seq_dentry(m, mnt->mnt_root, " \t \\"); |
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} |
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seq_putc(m, ' '); /* mountpoints outside of chroot jail will give SEQ_SKIP on this */ |
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err = seq_path_root(m, &mnt_path, &p->root, " \t \\"); |
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if (err) goto out; seq_puts(m, mnt->mnt_flags & MNT_READONLY ? " ro" : " rw"); show_mnt_opts(m, mnt); /* Tagged fields ("foo:X" or "bar") */ if (IS_MNT_SHARED(r)) seq_printf(m, " shared:%i", r->mnt_group_id); if (IS_MNT_SLAVE(r)) { int master = r->mnt_master->mnt_group_id; int dom = get_dominating_id(r, &p->root); seq_printf(m, " master:%i", master); if (dom && dom != master) seq_printf(m, " propagate_from:%i", dom); } if (IS_MNT_UNBINDABLE(r)) seq_puts(m, " unbindable"); /* Filesystem specific data */ seq_puts(m, " - "); show_type(m, sb); seq_putc(m, ' '); |
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if (sb->s_op->show_devname) { |
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err = sb->s_op->show_devname(m, mnt->mnt_root); |
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if (err) goto out; } else { |
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mangle(m, r->mnt_devname ? r->mnt_devname : "none"); |
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} |
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seq_puts(m, sb_rdonly(sb) ? " ro" : " rw"); |
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err = show_sb_opts(m, sb); if (err) goto out; if (sb->s_op->show_options) |
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err = sb->s_op->show_options(m, mnt->mnt_root); |
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seq_putc(m, ' '); out: return err; } static int show_vfsstat(struct seq_file *m, struct vfsmount *mnt) { |
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struct proc_mounts *p = m->private; |
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struct mount *r = real_mount(mnt); struct path mnt_path = { .dentry = mnt->mnt_root, .mnt = mnt }; |
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struct super_block *sb = mnt_path.dentry->d_sb; |
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int err; |
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/* device */ |
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if (sb->s_op->show_devname) { |
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seq_puts(m, "device "); |
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err = sb->s_op->show_devname(m, mnt_path.dentry); |
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if (err) goto out; |
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} else { if (r->mnt_devname) { seq_puts(m, "device "); mangle(m, r->mnt_devname); } else seq_puts(m, "no device"); } /* mount point */ seq_puts(m, " mounted on "); |
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/* mountpoints outside of chroot jail will give SEQ_SKIP on this */ err = seq_path_root(m, &mnt_path, &p->root, " \t \\"); if (err) goto out; |
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seq_putc(m, ' '); /* file system type */ seq_puts(m, "with fstype "); |
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show_type(m, sb); |
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/* optional statistics */ |
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if (sb->s_op->show_stats) { |
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seq_putc(m, ' '); |
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err = sb->s_op->show_stats(m, mnt_path.dentry); |
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} seq_putc(m, ' '); |
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out: |
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return err; } static int mounts_open_common(struct inode *inode, struct file *file, int (*show)(struct seq_file *, struct vfsmount *)) { struct task_struct *task = get_proc_task(inode); struct nsproxy *nsp; struct mnt_namespace *ns = NULL; struct path root; struct proc_mounts *p; |
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struct seq_file *m; |
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int ret = -EINVAL; if (!task) goto err; |
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task_lock(task); nsp = task->nsproxy; |
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if (!nsp || !nsp->mnt_ns) { |
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task_unlock(task); |
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put_task_struct(task); goto err; } ns = nsp->mnt_ns; |
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get_mnt_ns(ns); |
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if (!task->fs) { task_unlock(task); put_task_struct(task); ret = -ENOENT; goto err_put_ns; } get_fs_root(task->fs, &root); task_unlock(task); put_task_struct(task); |
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ret = seq_open_private(file, &mounts_op, sizeof(struct proc_mounts)); if (ret) |
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goto err_put_path; |
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m = file->private_data; m->poll_event = ns->event; |
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p = m->private; |
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p->ns = ns; p->root = root; |
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p->show = show; |
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p->cached_event = ~0ULL; |
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return 0; |
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err_put_path: path_put(&root); err_put_ns: put_mnt_ns(ns); err: return ret; } static int mounts_release(struct inode *inode, struct file *file) { |
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struct seq_file *m = file->private_data; struct proc_mounts *p = m->private; |
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path_put(&p->root); put_mnt_ns(p->ns); |
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return seq_release_private(inode, file); |
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} static int mounts_open(struct inode *inode, struct file *file) { return mounts_open_common(inode, file, show_vfsmnt); } static int mountinfo_open(struct inode *inode, struct file *file) { return mounts_open_common(inode, file, show_mountinfo); } static int mountstats_open(struct inode *inode, struct file *file) { return mounts_open_common(inode, file, show_vfsstat); } const struct file_operations proc_mounts_operations = { .open = mounts_open, .read = seq_read, .llseek = seq_lseek, .release = mounts_release, .poll = mounts_poll, }; const struct file_operations proc_mountinfo_operations = { .open = mountinfo_open, .read = seq_read, .llseek = seq_lseek, .release = mounts_release, .poll = mounts_poll, }; const struct file_operations proc_mountstats_operations = { .open = mountstats_open, .read = seq_read, .llseek = seq_lseek, .release = mounts_release, }; |