autofs4: allow autofs to work outside the initial PID namespace

Enable autofs4 to work in a "container".  oz_pgrp is converted from pid_t
to struct pid and this is stored at mount time based on the "pgrp=" option
or if the option is missing then the current pgrp.

The "pgrp=" option is interpreted in the PID namespace of the current
process.  This option is flawed in that it doesn't carry the namespace
information, so it should be deprecated.  AFAICS the autofs daemon always
sends the current pgrp, which is the default anyway.

The oz_pgrp is also set from the AUTOFS_DEV_IOCTL_SETPIPEFD_CMD ioctl.
This ioctl sets oz_pgrp to the current pgrp.  It is not allowed to change
the pid namespace.

oz_pgrp is used mainly to determine whether the process traversing the
autofs mount tree is the autofs daemon itself or not.  This function now
compares the pid pointers instead of the pid_t values.

One other use of oz_pgrp is in autofs4_show_options.  There is shows the
virtual pid number (i.e.  the one that is valid inside the PID namespace
of the calling process)

For debugging printk convert oz_pgrp to the value in the initial pid
namespace.

Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Ian Kent <raven@themaw.net>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index 3f1128b37e462cd3ef65560137e2194fe816990e..16d3288c808d475d9fbb3e0a90c14b5ebdcadd2b 100644 (file)
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -104,7 +104,7 @@ struct autofs_sb_info {
        u32 magic;
        int pipefd;
        struct file *pipe;
-       pid_t oz_pgrp;
+       struct pid *oz_pgrp;
        int catatonic;
        int version;
        int sub_version;
@@ -139,7 +139,7 @@ static inline struct autofs_info *autofs4_dentry_ino(struct dentry *dentry)
    filesystem without "magic".) */
 
 static inline int autofs4_oz_mode(struct autofs_sb_info *sbi) {
-       return sbi->catatonic || task_pgrp_nr(current) == sbi->oz_pgrp;
+       return sbi->catatonic || task_pgrp(current) == sbi->oz_pgrp;
 }
 
 /* Does a dentry have some pending activity? */

diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
index 743c7c2c949d2571c1c0ae0571c604d516c914e4..91838211b66d1f630248a33bfbc24fb67423b3b6 100644 (file)
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs4/dev-ioctl.c
@@ -346,6 +346,7 @@ static int autofs_dev_ioctl_setpipefd(struct file *fp,
 {
        int pipefd;
        int err = 0;
+       struct pid *new_pid = NULL;
 
        if (param->setpipefd.pipefd == -1)
                return -EINVAL;
@@ -357,7 +358,17 @@ static int autofs_dev_ioctl_setpipefd(struct file *fp,
                mutex_unlock(&sbi->wq_mutex);
                return -EBUSY;
        } else {
-               struct file *pipe = fget(pipefd);
+               struct file *pipe;
+
+               new_pid = get_task_pid(current, PIDTYPE_PGID);
+
+               if (ns_of_pid(new_pid) != ns_of_pid(sbi->oz_pgrp)) {
+                       AUTOFS_WARN("Not allowed to change PID namespace");
+                       err = -EINVAL;
+                       goto out;
+               }
+
+               pipe = fget(pipefd);
                if (!pipe) {
                        err = -EBADF;
                        goto out;
@@ -367,12 +378,13 @@ static int autofs_dev_ioctl_setpipefd(struct file *fp,
                        fput(pipe);
                        goto out;
                }
-               sbi->oz_pgrp = task_pgrp_nr(current);
+               swap(sbi->oz_pgrp, new_pid);
                sbi->pipefd = pipefd;
                sbi->pipe = pipe;
                sbi->catatonic = 0;
        }
 out:
+       put_pid(new_pid);
        mutex_unlock(&sbi->wq_mutex);
        return err;
 }

diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index b104726e2d0a7dbdb998e3daa574ec5e0326138c..1b045ecfcea2ff7fc783f9a678f324e750e1c1e8 100644 (file)
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -62,6 +62,8 @@ void autofs4_kill_sb(struct super_block *sb)
        /* Free wait queues, close pipe */
        autofs4_catatonic_mode(sbi);
 
+       put_pid(sbi->oz_pgrp);
+
        sb->s_fs_info = NULL;
        kfree(sbi);
 
@@ -85,7 +87,7 @@ static int autofs4_show_options(struct seq_file *m, struct dentry *root)
        if (!gid_eq(root_inode->i_gid, GLOBAL_ROOT_GID))
                seq_printf(m, ",gid=%u",
                        from_kgid_munged(&init_user_ns, root_inode->i_gid));
-       seq_printf(m, ",pgrp=%d", sbi->oz_pgrp);
+       seq_printf(m, ",pgrp=%d", pid_vnr(sbi->oz_pgrp));
        seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
        seq_printf(m, ",minproto=%d", sbi->min_proto);
        seq_printf(m, ",maxproto=%d", sbi->max_proto);
@@ -129,7 +131,8 @@ static const match_table_t tokens = {
 };
 
 static int parse_options(char *options, int *pipefd, kuid_t *uid, kgid_t *gid,
-               pid_t *pgrp, unsigned int *type, int *minproto, int *maxproto)
+                        int *pgrp, bool *pgrp_set, unsigned int *type,
+                        int *minproto, int *maxproto)
 {
        char *p;
        substring_t args[MAX_OPT_ARGS];
@@ -137,7 +140,6 @@ static int parse_options(char *options, int *pipefd, kuid_t *uid, kgid_t *gid,
 
        *uid = current_uid();
        *gid = current_gid();
-       *pgrp = task_pgrp_nr(current);
 
        *minproto = AUTOFS_MIN_PROTO_VERSION;
        *maxproto = AUTOFS_MAX_PROTO_VERSION;
@@ -176,6 +178,7 @@ static int parse_options(char *options, int *pipefd, kuid_t *uid, kgid_t *gid,
                        if (match_int(args, &option))
                                return 1;
                        *pgrp = option;
+                       *pgrp_set = true;
                        break;
                case Opt_minproto:
                        if (match_int(args, &option))
@@ -211,6 +214,8 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
        int pipefd;
        struct autofs_sb_info *sbi;
        struct autofs_info *ino;
+       int pgrp;
+       bool pgrp_set = false;
 
        sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
        if (!sbi)
@@ -223,7 +228,7 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
        sbi->pipe = NULL;
        sbi->catatonic = 1;
        sbi->exp_timeout = 0;
-       sbi->oz_pgrp = task_pgrp_nr(current);
+       sbi->oz_pgrp = NULL;
        sbi->sb = s;
        sbi->version = 0;
        sbi->sub_version = 0;
@@ -260,12 +265,23 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
 
        /* Can this call block? */
        if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
-                               &sbi->oz_pgrp, &sbi->type, &sbi->min_proto,
-                               &sbi->max_proto)) {
+                         &pgrp, &pgrp_set, &sbi->type, &sbi->min_proto,
+                         &sbi->max_proto)) {
                printk("autofs: called with bogus options\n");
                goto fail_dput;
        }
 
+       if (pgrp_set) {
+               sbi->oz_pgrp = find_get_pid(pgrp);
+               if (!sbi->oz_pgrp) {
+                       pr_warn("autofs: could not find process group %d\n",
+                               pgrp);
+                       goto fail_dput;
+               }
+       } else {
+               sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID);
+       }
+
        if (autofs_type_trigger(sbi->type))
                __managed_dentry_set_managed(root);
 
@@ -289,9 +305,9 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
                sbi->version = sbi->max_proto;
        sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
 
-       DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp);
+       DPRINTK("pipe fd = %d, pgrp = %u", pipefd, pid_nr(sbi->oz_pgrp));
        pipe = fget(pipefd);
-       
+
        if (!pipe) {
                printk("autofs: could not open pipe file descriptor\n");
                goto fail_dput;
@@ -321,6 +337,7 @@ fail_dput:
 fail_ino:
        kfree(ino);
 fail_free:
+       put_pid(sbi->oz_pgrp);
        kfree(sbi);
        s->s_fs_info = NULL;
 fail_unlock: