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authorSukadev Bhattiprolu <sukadev@us.ibm.com>2014-01-23 15:54:57 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-23 16:36:58 -0800
commit6eaba35b437438988078efc92f1ef445a00cd7bc (patch)
tree7fcd78f3c0c8423a87464561d410784d7389f944 /fs/autofs4/inode.c
parentinit: fix possible format string bug (diff)
downloadlinux-dev-6eaba35b437438988078efc92f1ef445a00cd7bc.tar.xz
linux-dev-6eaba35b437438988078efc92f1ef445a00cd7bc.zip
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> Acked-by: Ian Kent <raven@themaw.net> Cc: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/autofs4/inode.c')
-rw-r--r--fs/autofs4/inode.c36
1 files changed, 27 insertions, 9 deletions
diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index 3b9cc9b973c2..a3de082db620 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -56,8 +56,11 @@ void autofs4_kill_sb(struct super_block *sb)
* just call kill_anon_super when we are called from
* deactivate_super.
*/
- if (sbi) /* Free wait queues, close pipe */
+ if (sbi) {
+ /* Free wait queues, close pipe */
autofs4_catatonic_mode(sbi);
+ put_pid(sbi->oz_pgrp);
+ }
DPRINTK("shutting down");
kill_litter_super(sb);
@@ -80,7 +83,7 @@ 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);
@@ -124,7 +127,8 @@ 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];
@@ -132,7 +136,6 @@ 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;
@@ -171,6 +174,7 @@ 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))
@@ -206,6 +210,8 @@ 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)
@@ -218,7 +224,7 @@ 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;
@@ -255,12 +261,23 @@ 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);
@@ -284,9 +301,9 @@ 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;
@@ -316,6 +333,7 @@ fail_dput:
fail_ino:
kfree(ino);
fail_free:
+ put_pid(sbi->oz_pgrp);
kfree(sbi);
s->s_fs_info = NULL;
fail_unlock: