diff options
author | Eric W. Biederman <ebiederm@xmission.com> | 2016-06-09 20:32:10 (GMT) |
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committer | Eric W. Biederman <ebiederm@xmission.com> | 2016-06-23 20:41:54 (GMT) |
commit | e94591d0d90c13166cb6eb54ce5f96ed13d81b55 (patch) | |
tree | a52df89fe96d5ed24657c3fed1552ffc1d474b3a /fs/proc/root.c | |
parent | d91ee87d8d85a0808c01787e8b4a6b48f2ba487b (diff) | |
download | linux-e94591d0d90c13166cb6eb54ce5f96ed13d81b55.tar.xz |
proc: Convert proc_mount to use mount_ns.
Move the call of get_pid_ns, the call of proc_parse_options, and
the setting of s_iflags into proc_fill_super so that mount_ns
can be used.
Convert proc_mount to call mount_ns and remove the now unnecessary
code.
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Reviewed-by: Djalal Harouni <tixxdz@gmail.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'fs/proc/root.c')
-rw-r--r-- | fs/proc/root.c | 52 |
1 files changed, 4 insertions, 48 deletions
diff --git a/fs/proc/root.c b/fs/proc/root.c index a1b2860..8d3e484 100644 --- a/fs/proc/root.c +++ b/fs/proc/root.c @@ -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) |