proc: Convert proc_mount to use mount_ns. (e94591d0) · Commits · 戴 / test

fs/proc/inode.c

+7 −2

Original line number	Diff line number	Diff line
		@@ -457,12 +457,17 @@ struct inode proc_get_inode(struct super_block sb, struct proc_dir_entry *de)
		return inode;
		}

		int proc_fill_super(struct super_block *s)
		int proc_fill_super(struct super_block s, void data, int silent)
		{
		struct pid_namespace *ns = get_pid_ns(s->s_fs_info);
		struct inode *root_inode;
		int ret;

		s->s_iflags \|= SB_I_USERNS_VISIBLE;
		if (!proc_parse_options(data, ns))
		return -EINVAL;

		/* User space would break if executables appear on proc */
		s->s_iflags \|= SB_I_USERNS_VISIBLE \| SB_I_NOEXEC;
		s->s_flags \|= MS_NODIRATIME \| MS_NOSUID \| MS_NOEXEC;
		s->s_blocksize = 1024;
		s->s_blocksize_bits = 10;

fs/proc/internal.h

+2 −1

Original line number	Diff line number	Diff line
		@@ -212,7 +212,7 @@ extern const struct inode_operations proc_pid_link_inode_operations;

		extern void proc_init_inodecache(void);
		extern struct inode proc_get_inode(struct super_block , struct proc_dir_entry *);
		extern int proc_fill_super(struct super_block *);
		extern int proc_fill_super(struct super_block , void data, int flags);
		extern void proc_entry_rundown(struct proc_dir_entry *);

		/*
		@@ -268,6 +268,7 @@ static inline void proc_tty_init(void) {}
		* root.c
		*/
		extern struct proc_dir_entry proc_root;
		extern int proc_parse_options(char options, struct pid_namespace pid);

		extern void proc_self_init(void);
		extern int proc_remount(struct super_block , int , char *);

fs/proc/root.c

+4 −48

Original line number	Diff line number	Diff line
		@@ -23,21 +23,6 @@

		#include "internal.h"

		static int proc_test_super(struct super_block sb, void data)
		{
		return sb->s_fs_info == data;
		}

		static int proc_set_super(struct super_block sb, void data)
		{
		int err = set_anon_super(sb, NULL);
		if (!err) {
		struct pid_namespace ns = (struct pid_namespace )data;
		sb->s_fs_info = get_pid_ns(ns);
		}
		return err;
		}

		enum {
		Opt_gid, Opt_hidepid, Opt_err,
		};
		@@ -48,7 +33,7 @@ static const match_table_t tokens = {
		{Opt_err, NULL},
		};

		static int proc_parse_options(char options, struct pid_namespace pid)
		int proc_parse_options(char options, struct pid_namespace pid)
		{
		char *p;
		substring_t args[MAX_OPT_ARGS];
		@@ -100,45 +85,16 @@ int proc_remount(struct super_block sb, int flags, char *data)
		static struct dentry proc_mount(struct file_system_type fs_type,
		int flags, const char dev_name, void data)
		{
		int err;
		struct super_block *sb;
		struct pid_namespace *ns;
		char *options;

		if (flags & MS_KERNMOUNT) {
		ns = (struct pid_namespace *)data;
		options = NULL;
		ns = data;
		data = NULL;
		} else {
		ns = task_active_pid_ns(current);
		options = data;

		/* Does the mounter have privilege over the pid namespace? */
		if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN))
		return ERR_PTR(-EPERM);
		}

		sb = sget(fs_type, proc_test_super, proc_set_super, flags, ns);
		if (IS_ERR(sb))
		return ERR_CAST(sb);

		if (!proc_parse_options(options, ns)) {
		deactivate_locked_super(sb);
		return ERR_PTR(-EINVAL);
		}

		if (!sb->s_root) {
		err = proc_fill_super(sb);
		if (err) {
		deactivate_locked_super(sb);
		return ERR_PTR(err);
		}

		sb->s_flags \|= MS_ACTIVE;
		/* User space would break if executables appear on proc */
		sb->s_iflags \|= SB_I_NOEXEC;
		}

		return dget(sb->s_root);
		return mount_ns(fs_type, flags, data, ns, ns->user_ns, proc_fill_super);
		}

		static void proc_kill_sb(struct super_block *sb)

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