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User namespaces: set of cleanups (v2)

PATCH In review Serge E. Hallyn 3 participants 12 messages Oct 24, 2008 – Oct 29, 2008

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Serge E. Hallyn

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PATCH 1/1 User namespaces: set of cleanups (v2)

Hi Stephen,

would you mind applying the patch below behind
git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/cred-2.6.git#creds-v3?

Assuming David has no objections?

I've just tested with David's plain creds-v3 tree and had no problems. (compiled with CONFIG_USER_NS=y|n and CONFIG_KEYS=y|n, boot+ltp with both =y)

Or would it fit your model better if I found a place to keep a quilt patchset or git tree?

thanks,
-serge

Subject: [PATCH] User namespaces: set of cleanups (v2)
From: Serge Hallyn <[email protected]>
Date: 1224106725 -0500

The user_ns is moved from nsproxy to user_struct, so that a struct cred by itself is sufficient to determine access (which it otherwise would not be). Corresponding ecryptfs fixes (by David Howells) are here as well.

Fix refcounting. The following rules now apply:
1. The task pins the user struct.
2. The user struct pins its user namespace.
3. The user namespace pins the struct user which created it.

User namespaces are cloned during copy_creds(). Unsharing a new user_ns is no longer possible. (We could re-add that, but it'll cause code duplication and doesn't seem useful if PAM doesn't need to clone user namespaces).

When a user namespace is created, its first user (uid 0) gets empty keyrings and a clean group_info.

This incorporates a previous patch by David Howells. Here is his original patch description:

Quoted 25 lines

I suggest adding the attached incremental patch. It makes the following changes:

(1) Provides a current_user_ns() macro to wrap accesses to current's user namespace.

(2) Fixes eCryptFS.

(3) Renames create_new_userns() to create_user_ns() to be more consistent with the other associated functions and because the 'new' in the name is superfluous.

(4) Moves the argument and permission checks made for CLONE_NEWUSER to the beginning of do_fork() so that they're done prior to making any attempts at allocation.

(5) Calls create_user_ns() after prepare_creds(), and gives it the new creds to fill in rather than have it return the new root user. I don't imagine the new root user being used for anything other than filling in a cred struct.

This also permits me to get rid of a get_uid() and a free_uid(), as the reference the creds were holding on the old user_struct can just be transferred to the new namespace's creator pointer.

Quoted 6 lines

(6) Makes create_user_ns() reset the UIDs and GIDs of the creds under preparation rather than doing it in copy_creds().

David

Signed-off-by David Howells <[email protected]>

Changelog:
Oct 20: integrate dhowells comments
1. leave thread_keyring alone
2. use current_user_ns() in set_user()

Signed-off-by Serge Hallyn <[email protected]>

---

 fs/ecryptfs/messaging.c        |   13 +++----
 fs/ecryptfs/miscdev.c          |   19 ++++------
 include/linux/cred.h           |    2 +
 include/linux/init_task.h      |    1 -
 include/linux/nsproxy.h        |    1 -
 include/linux/sched.h          |    1 +
 include/linux/user_namespace.h |   13 ++-----
 kernel/cred.c                  |   15 +++++++-
 kernel/fork.c                  |   19 +++++++++-
 kernel/nsproxy.c               |   15 +-------
 kernel/sys.c                   |    4 +-
 kernel/user.c                  |   47 +++++++------------------
 kernel/user_namespace.c        |   75 ++++++++++++++++------------------------
 13 files changed, 96 insertions(+), 129 deletions(-)

baaa8d300c8f21a77c323ab41616c865c4f04a20

fs/ecryptfs/messaging.c +6 -7
index 92bf606..eecb8b5 100644
@@ -376,7 +376,7 @@ int ecryptfs_process_response(struct ecr
 	struct ecryptfs_msg_ctx *msg_ctx;
 	size_t msg_size;
 	struct nsproxy *nsproxy;
-	struct user_namespace *current_user_ns;
+	struct user_namespace *tsk_user_ns;
 	uid_t ctx_euid;
 	int rc;
 

@@ -401,9 +401,9 @@ int ecryptfs_process_response(struct ecr
 		mutex_unlock(&ecryptfs_daemon_hash_mux);
 		goto wake_up;
 	}
-	current_user_ns = nsproxy->user_ns;
+	tsk_user_ns = __task_cred(msg_ctx->task)->user->user_ns;
 	ctx_euid = task_euid(msg_ctx->task);
-	rc = ecryptfs_find_daemon_by_euid(&daemon, ctx_euid, current_user_ns);
+	rc = ecryptfs_find_daemon_by_euid(&daemon, ctx_euid, tsk_user_ns);
 	rcu_read_unlock();
 	mutex_unlock(&ecryptfs_daemon_hash_mux);
 	if (rc) {

@@ -421,11 +421,11 @@ int ecryptfs_process_response(struct ecr
 		       euid, ctx_euid);
 		goto unlock;
 	}
-	if (current_user_ns != user_ns) {
+	if (tsk_user_ns != user_ns) {
 		rc = -EBADMSG;
 		printk(KERN_WARNING "%s: Received message from user_ns "
 		       "[0x%p]; expected message from user_ns [0x%p]\n",
-		       __func__, user_ns, nsproxy->user_ns);
+		       __func__, user_ns, tsk_user_ns);
 		goto unlock;
 	}
 	if (daemon->pid != pid) {

@@ -486,8 +486,7 @@ ecryptfs_send_message_locked(unsigned in
 	uid_t euid = current_euid();
 	int rc;
 
-	rc = ecryptfs_find_daemon_by_euid(&daemon, euid,
-					  current->nsproxy->user_ns);
+	rc = ecryptfs_find_daemon_by_euid(&daemon, euid, current_user_ns());
 	if (rc || !daemon) {
 		rc = -ENOTCONN;
 		printk(KERN_ERR "%s: User [%d] does not have a daemon "
fs/ecryptfs/miscdev.c +7 -12
index 047ac60..efd95a0 100644
@@ -47,8 +47,7 @@ ecryptfs_miscdev_poll(struct file *file,
 
 	mutex_lock(&ecryptfs_daemon_hash_mux);
 	/* TODO: Just use file->private_data? */
-	rc = ecryptfs_find_daemon_by_euid(&daemon, euid,
-					  current->nsproxy->user_ns);
+	rc = ecryptfs_find_daemon_by_euid(&daemon, euid, current_user_ns());
 	BUG_ON(rc || !daemon);
 	mutex_lock(&daemon->mux);
 	mutex_unlock(&ecryptfs_daemon_hash_mux);

@@ -95,11 +94,9 @@ ecryptfs_miscdev_open(struct inode *inod
 		       "count; rc = [%d]\n", __func__, rc);
 		goto out_unlock_daemon_list;
 	}
-	rc = ecryptfs_find_daemon_by_euid(&daemon, euid,
-					  current->nsproxy->user_ns);
+	rc = ecryptfs_find_daemon_by_euid(&daemon, euid, current_user_ns());
 	if (rc || !daemon) {
-		rc = ecryptfs_spawn_daemon(&daemon, euid,
-					   current->nsproxy->user_ns,
+		rc = ecryptfs_spawn_daemon(&daemon, euid, current_user_ns(),
 					   task_pid(current));
 		if (rc) {
 			printk(KERN_ERR "%s: Error attempting to spawn daemon; "

@@ -153,8 +150,7 @@ ecryptfs_miscdev_release(struct inode *i
 	int rc;
 
 	mutex_lock(&ecryptfs_daemon_hash_mux);
-	rc = ecryptfs_find_daemon_by_euid(&daemon, euid,
-					  current->nsproxy->user_ns);
+	rc = ecryptfs_find_daemon_by_euid(&daemon, euid, current_user_ns());
 	BUG_ON(rc || !daemon);
 	mutex_lock(&daemon->mux);
 	BUG_ON(daemon->pid != task_pid(current));

@@ -254,8 +250,7 @@ ecryptfs_miscdev_read(struct file *file,
 
 	mutex_lock(&ecryptfs_daemon_hash_mux);
 	/* TODO: Just use file->private_data? */
-	rc = ecryptfs_find_daemon_by_euid(&daemon, euid,
-					  current->nsproxy->user_ns);
+	rc = ecryptfs_find_daemon_by_euid(&daemon, euid, current_user_ns());
 	BUG_ON(rc || !daemon);
 	mutex_lock(&daemon->mux);
 	if (daemon->flags & ECRYPTFS_DAEMON_ZOMBIE) {

@@ -295,7 +290,7 @@ check_list:
 		goto check_list;
 	}
 	BUG_ON(euid != daemon->euid);
-	BUG_ON(current->nsproxy->user_ns != daemon->user_ns);
+	BUG_ON(current_user_ns() != daemon->user_ns);
 	BUG_ON(task_pid(current) != daemon->pid);
 	msg_ctx = list_first_entry(&daemon->msg_ctx_out_queue,
 				   struct ecryptfs_msg_ctx, daemon_out_list);

@@ -468,7 +463,7 @@ ecryptfs_miscdev_write(struct file *file
 			goto out_free;
 		}
 		rc = ecryptfs_miscdev_response(&data[i], packet_size,
-					       euid, current->nsproxy->user_ns,
+					       euid, current_user_ns(),
 					       task_pid(current), seq);
 		if (rc)
 			printk(KERN_WARNING "%s: Failed to deliver miscdev "
include/linux/cred.h +2 -0
index 26c1ab1..3282ee4 100644
@@ -60,6 +60,7 @@ do {							\
 } while (0)
 
 extern struct group_info *groups_alloc(int);
+extern struct group_info init_groups;
 extern void groups_free(struct group_info *);
 extern int set_current_groups(struct group_info *);
 extern int set_groups(struct cred *, struct group_info *);

@@ -315,6 +316,7 @@ static inline void put_cred(const struct
 #define current_fsgid() 	(current_cred_xxx(fsgid))
 #define current_cap()		(current_cred_xxx(cap_effective))
 #define current_user()		(current_cred_xxx(user))
+#define current_user_ns()	(current_cred_xxx(user)->user_ns)
 #define current_security()	(current_cred_xxx(security))
 
 #define current_uid_gid(_uid, _gid)		\
include/linux/init_task.h +0 -1
index edf0285..126c3c4 100644
@@ -57,7 +57,6 @@ extern struct nsproxy init_nsproxy;
 	.mnt_ns		= NULL,						\
 	INIT_NET_NS(net_ns)                                             \
 	INIT_IPC_NS(ipc_ns)						\
-	.user_ns	= &init_user_ns,				\
 }
 
 #define INIT_SIGHAND(sighand) {						\
include/linux/nsproxy.h +0 -1
index c8a768e..afad7de 100644
@@ -27,7 +27,6 @@ struct nsproxy {
 	struct ipc_namespace *ipc_ns;
 	struct mnt_namespace *mnt_ns;
 	struct pid_namespace *pid_ns;
-	struct user_namespace *user_ns;
 	struct net 	     *net_ns;
 };
 extern struct nsproxy init_nsproxy;
include/linux/sched.h +1 -0
index 0812cfd..02693db 100644
@@ -595,6 +595,7 @@ struct user_struct {
 	/* Hash table maintenance information */
 	struct hlist_node uidhash_node;
 	uid_t uid;
+	struct user_namespace *user_ns;
 
 #ifdef CONFIG_USER_SCHED
 	struct task_group *tg;
include/linux/user_namespace.h +4 -9
index b5f41d4..315bcd3 100644
@@ -12,7 +12,7 @@
 struct user_namespace {
 	struct kref		kref;
 	struct hlist_head	uidhash_table[UIDHASH_SZ];
-	struct user_struct	*root_user;
+	struct user_struct	*creator;
 };
 
 extern struct user_namespace init_user_ns;

@@ -26,8 +26,7 @@ static inline struct user_namespace *get
 	return ns;
 }
 
-extern struct user_namespace *copy_user_ns(int flags,
-					   struct user_namespace *old_ns);
+extern int create_user_ns(struct cred *new);
 extern void free_user_ns(struct kref *kref);
 
 static inline void put_user_ns(struct user_namespace *ns)

@@ -43,13 +42,9 @@ static inline struct user_namespace *get
 	return &init_user_ns;
 }
 
-static inline struct user_namespace *copy_user_ns(int flags,
-						  struct user_namespace *old_ns)
+static inline int create_user_ns(struct cred *new)
 {
-	if (flags & CLONE_NEWUSER)
-		return ERR_PTR(-EINVAL);
-
-	return old_ns;
+	return -EINVAL;
 }
 
 static inline void put_user_ns(struct user_namespace *ns)
kernel/cred.c +13 -2
index 13697ca..ff7bc07 100644
@@ -274,6 +274,7 @@ int copy_creds(struct task_struct *p, un
 	struct thread_group_cred *tgcred;
 #endif
 	struct cred *new;
+	int ret;
 
 	mutex_init(&p->cred_exec_mutex);
 

@@ -293,6 +294,12 @@ int copy_creds(struct task_struct *p, un
 	if (!new)
 		return -ENOMEM;
 
+	if (clone_flags & CLONE_NEWUSER) {
+		ret = create_user_ns(new);
+		if (ret < 0)
+			goto error_put;
+	}
+
 #ifdef CONFIG_KEYS
 	/* new threads get their own thread keyrings if their parent already
 	 * had one */

@@ -309,8 +316,8 @@ int copy_creds(struct task_struct *p, un
 	if (!(clone_flags & CLONE_THREAD)) {
 		tgcred = kmalloc(sizeof(*tgcred), GFP_KERNEL);
 		if (!tgcred) {
-			put_cred(new);
-			return -ENOMEM;
+			ret = -ENOMEM;
+			goto error_put;
 		}
 		atomic_set(&tgcred->usage, 1);
 		spin_lock_init(&tgcred->lock);

@@ -325,6 +332,10 @@ int copy_creds(struct task_struct *p, un
 	atomic_inc(&new->user->processes);
 	p->cred = p->real_cred = get_cred(new);
 	return 0;
+
+error_put:
+	put_cred(new);
+	return ret;
 }
 
 /**
kernel/fork.c +16 -3
index e392e5a..c71f3c1 100644
@@ -935,7 +935,7 @@ static struct task_struct *copy_process(
 	if (atomic_read(&p->real_cred->user->processes) >=
 			p->signal->rlim[RLIMIT_NPROC].rlim_cur) {
 		if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RESOURCE) &&
-		    p->real_cred->user != current->nsproxy->user_ns->root_user)
+		    p->real_cred->user != INIT_USER)
 			goto bad_fork_free;
 	}
 

@@ -1312,6 +1312,20 @@ long do_fork(unsigned long clone_flags,
 	long nr;
 
 	/*
+	 * Do some preliminary argument and permissions checking before we
+	 * actually start allocating stuff
+	 */
+	if (clone_flags & CLONE_NEWUSER) {
+		if (clone_flags & CLONE_THREAD)
+			return -EINVAL;
+		/* hopefully this check will go away when userns support is
+		 * complete
+		 */
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+	}
+
+	/*
 	 * We hope to recycle these flags after 2.6.26
 	 */
 	if (unlikely(clone_flags & CLONE_STOPPED)) {

@@ -1556,8 +1570,7 @@ asmlinkage long sys_unshare(unsigned lon
 	err = -EINVAL;
 	if (unshare_flags & ~(CLONE_THREAD|CLONE_FS|CLONE_NEWNS|CLONE_SIGHAND|
 				CLONE_VM|CLONE_FILES|CLONE_SYSVSEM|
-				CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWUSER|
-				CLONE_NEWNET))
+				CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWNET))
 		goto bad_unshare_out;
 
 	/*
kernel/nsproxy.c +2 -13
index 1d3ef29..63598dc 100644
@@ -80,12 +80,6 @@ static struct nsproxy *create_new_namesp
 		goto out_pid;
 	}
 
-	new_nsp->user_ns = copy_user_ns(flags, tsk->nsproxy->user_ns);
-	if (IS_ERR(new_nsp->user_ns)) {
-		err = PTR_ERR(new_nsp->user_ns);
-		goto out_user;
-	}
-
 	new_nsp->net_ns = copy_net_ns(flags, tsk->nsproxy->net_ns);
 	if (IS_ERR(new_nsp->net_ns)) {
 		err = PTR_ERR(new_nsp->net_ns);

@@ -95,9 +89,6 @@ static struct nsproxy *create_new_namesp
 	return new_nsp;
 
 out_net:
-	if (new_nsp->user_ns)
-		put_user_ns(new_nsp->user_ns);
-out_user:
 	if (new_nsp->pid_ns)
 		put_pid_ns(new_nsp->pid_ns);
 out_pid:

@@ -130,7 +121,7 @@ int copy_namespaces(unsigned long flags,
 	get_nsproxy(old_ns);
 
 	if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
-				CLONE_NEWUSER | CLONE_NEWPID | CLONE_NEWNET)))
+				CLONE_NEWPID | CLONE_NEWNET)))
 		return 0;
 
 	if (!capable(CAP_SYS_ADMIN)) {

@@ -173,8 +164,6 @@ void free_nsproxy(struct nsproxy *ns)
 		put_ipc_ns(ns->ipc_ns);
 	if (ns->pid_ns)
 		put_pid_ns(ns->pid_ns);
-	if (ns->user_ns)
-		put_user_ns(ns->user_ns);
 	put_net(ns->net_ns);
 	kmem_cache_free(nsproxy_cachep, ns);
 }

@@ -189,7 +178,7 @@ int unshare_nsproxy_namespaces(unsigned 
 	int err = 0;
 
 	if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
-			       CLONE_NEWUSER | CLONE_NEWNET)))
+			       CLONE_NEWNET)))
 		return 0;
 
 	if (!capable(CAP_SYS_ADMIN))
kernel/sys.c +2 -2
index 6bc3899..5f8cc0e 100644
@@ -565,13 +565,13 @@ static int set_user(struct cred *new)
 {
 	struct user_struct *new_user;
 
-	new_user = alloc_uid(current->nsproxy->user_ns, new->uid);
+	new_user = alloc_uid(current_user_ns(), new->uid);
 	if (!new_user)
 		return -EAGAIN;
 
 	if (atomic_read(&new_user->processes) >=
 				current->signal->rlim[RLIMIT_NPROC].rlim_cur &&
-			new_user != current->nsproxy->user_ns->root_user) {
+			new_user != INIT_USER) {
 		free_uid(new_user);
 		return -EAGAIN;
 	}
kernel/user.c +13 -34

118 lines not on this page · raw message

kernel/user_namespace.c +30 -45

107 lines not on this page · raw message

Signature · 1 line
1.1.6
#1 lore raw
Quoted 1 line · Serge E. Hallyn

I've just tested with David's plain creds-v3 tree

Note the creds-v4 branch is now current. Is it worth me replacing that with a tree that just has a master branch to simplify things?

kernel/user.c struct user_struct *find_user(uid_t uid) · line 364

Quoted 2 lines
kernel/user.c +1 -1
-	struct user_namespace *ns = current->nsproxy->user_ns;
+	struct user_namespace *ns = current_user()->user_ns;

current_user_ns() perchance?

Looks

author
#2 lore raw
Quoted 6 lines · David Howells
Quoted 1 line · Serge E. Hallyn

I've just tested with David's plain creds-v3 tree

Note the creds-v4 branch is now current. Is it worth me replacing that with a tree that just has a master branch to simplify things?

I saw it in your list of branches, but linux-next/Next/Trees still listed v3 so i figured i should test against that.

Quoted 4 lines

kernel/user.c struct user_struct *find_user(uid_t uid) · line 364

Quoted 2 lines
kernel/user.c +1 -1
-	struct user_namespace *ns = current->nsproxy->user_ns;
+	struct user_namespace *ns = current_user()->user_ns;

current_user_ns() perchance?

Yes, thanks. (Of course that doesn't break anything so if the patch is otherwise ok i've written down a note to send a follow-up patch)

thanks,
-serge

#3 lore raw
Quoted 2 lines · Serge E. Hallyn

I saw it in your list of branches, but linux-next/Next/Trees still listed v3 so i figured i should test against that.

One day I might actually manage to use GIT properly...

David

#4 lore raw
In reply to David Howells

Hi David,

Quoted 7 lines · On Fri, 24 Oct 2008 19:44:01 +0100 David Howells <[email protected]> wrote:
Quoted 1 line · Serge E. Hallyn

I've just tested with David's plain creds-v3 tree

Note the creds-v4 branch is now current. Is it worth me replacing that with a tree that just has a master branch to simplify things?

It would be good if you could have a "next" (or "creds-next" or something) branch in your tree and I can fetch that (that way I don't have to keep updating my configs). It is OK if thet branch rebases and may just be an alias for another branch (or a subset if you have experimental stuff in there. Remember "posted, reviewed, tested before it is in linux-next".

Thanks.

Signature · 3 lines
Cheers,
Stephen Rothwell                    [email protected]
http://www.canb.auug.org.au/~sfr/
#5 lore raw
Quoted 6 lines · Stephen Rothwell

It would be good if you could have a "next" (or "creds-next" or something) branch in your tree and I can fetch that (that way I don't have to keep updating my configs). It is OK if thet branch rebases and may just be an alias for another branch (or a subset if you have experimental stuff in there. Remember "posted, reviewed, tested before it is in linux-next".

Those patches aren't likely to change much, and they get hit with LTP regularly.

What base for the patches? Linus's head?

David

#6 lore raw

Hi David,

Quoted 10 lines · On Sun, 26 Oct 2008 11:07:53 +0000 David Howells <[email protected]> wrote:
Quoted 6 lines · Stephen Rothwell

It would be good if you could have a "next" (or "creds-next" or something) branch in your tree and I can fetch that (that way I don't have to keep updating my configs). It is OK if thet branch rebases and may just be an alias for another branch (or a subset if you have experimental stuff in there. Remember "posted, reviewed, tested before it is in linux-next".

Quoted 2 lines

Those patches aren't likely to change much, and they get hit with LTP regularly.

They already changed between what I thought was the correct branch and what was the correct branch :-)

Quoted 1 line

What base for the patches? Linus's head?

Yes. Or whatever it is based on now if that merges OK with Linus' head (try a test merge). Just don't base on linux-next :-)

What I want is exactly what you will ask/have asked Linus to fetch but without the branch name changing .. I care more about the name changing than the contents changing.

So .. what branch do I fetch tomorrow? (Hint: if you have your version for Linus checked out then type "git branch next" and reply to this email saying "next" :-))

Signature · 3 lines
Cheers,
Stephen Rothwell                    [email protected]
http://www.canb.auug.org.au/~sfr/
#7 lore raw
Quoted 2 lines · Stephen Rothwell

Yes. Or whatever it is based on now if that merges OK with Linus' head (try a test merge). Just don't base on linux-next :-)

It's based on Linus's head at the moment, give or take the last few bits he pulled in which I haven't dealt with yet.

Quoted 7 lines

What I want is exactly what you will ask/have asked Linus to fetch but without the branch name changing .. I care more about the name changing than the contents changing.

So .. what branch do I fetch tomorrow? (Hint: if you have your version for Linus checked out then type "git branch next" and reply to this email saying "next" :-))

I asked him to pull creds-v4 last:

	http://git.kernel.org/?p=linux/kernel/git/dhowells/cred-2.6.git;a=shortlog;h=creds-v4

I'd quite like to amend the name of the branch to something more sensible, since the 'v<N>' represented new versions based on fixing up merges with Linus's tree rather than changing my patches.

However, if you'd rather I just threw new merges on top of that, then I can do that - it's just got a silly branch name.

Alternatively, if you'd rather James pulled it into his 'next' branch, he might be amenable to that.

David

#8 lore raw
In reply to Stephen Rothwell
Quoted 5 lines · Stephen Rothwell
Quoted 2 lines

Those patches aren't likely to change much, and they get hit with LTP regularly.

They already changed between what I thought was the correct branch and what was the correct branch :-)

If you're talking about between James's two creds branches, he did ask you to pull from the new one - just before you went on holiday, so I suspect you didn't see it till you got back.

If you're talking about my creds-v3 and creds-v4 branches, the difference was merge conflicts with Linus, nothing more. And really, I should just have thrown the merge on top of creds-v3 rather than trying to maintain my patchset and producing a creds-v4. That's one of the reasons I'd like to recreate my kernel.org tree - to get rid of the unnecessary labels.

David

#9 lore raw
In reply to Serge E. Hallyn

Hi Serge,

Quoted 4 lines · On Fri, 24 Oct 2008 12:48:38 -0500 "Serge E. Hallyn" <[email protected]> wrote:

would you mind applying the patch below behind
git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/cred-2.6.git#creds-v3?

Quoted 8 lines

Assuming David has no objections?

I've just tested with David's plain creds-v3 tree and had no problems. (compiled with CONFIG_USER_NS=y|n and CONFIG_KEYS=y|n, boot+ltp with both =y)

Or would it fit your model better if I found a place to keep a quilt patchset or git tree?

Better if you can set up a git tree (or quilt series) somewhere as I intend to only carry fixup patches myself in linux-next (so far). Also that means when you update your patches, I will just fetch them automatically.

If this stuff depends on David's work, then I need to know that explicitly so I can do ordering. If it depends closely (i.e. changes in Davids tree need to be reflected in yours) then you and David need to come to some arrangement (maybe David could host your tree as a branch of his (managing conflicts/updates).

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Cheers,
Stephen Rothwell                    [email protected]
http://www.canb.auug.org.au/~sfr/
author
#10 lore raw
Quoted 13 lines · Stephen Rothwell

Hi Serge,

Quoted 10 lines · On Fri, 24 Oct 2008 12:48:38 -0500 "Serge E. Hallyn" <[email protected]> wrote:

would you mind applying the patch below behind
git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/cred-2.6.git#creds-v3?

Assuming David has no objections?

I've just tested with David's plain creds-v3 tree and had no problems. (compiled with CONFIG_USER_NS=y|n and CONFIG_KEYS=y|n, boot+ltp with both =y)

Quoted 7 lines
Quoted 2 lines

Or would it fit your model better if I found a place to keep a quilt patchset or git tree?

Better if you can set up a git tree (or quilt series) somewhere as I intend to only carry fixup patches myself in linux-next (so far). Also that means when you update your patches, I will just fetch them automatically.

The tree is up at:

git://git.kernel.org/pub/scm/linux/kernel/git/sergeh/userns-2.6#next

with just two patches on top of David's creds-v4.

Quoted 2 lines

If this stuff depends on David's work, then I need to know that explicitly so I can do ordering. If it depends closely (i.e. changes in

Yes it belongs after his creds-v4 tree.

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Davids tree need to be reflected in yours) then you and David need to come to some arrangement (maybe David could host your tree as a branch of his (managing conflicts/updates).

I don't know how many additional changes David plans to make in the near future. Assuming he makes them in creds-v4 and not in a new tree I guess I'll feel the pain but that's how it goes.

Any additional userns patches would likely be feature enhancements and I don't expect to get them in any kindo f merge-worthy shape before 2.6.29 is out.

thanks,
-serge

#11 lore raw

Hi Serge,

Quoted 4 lines · On Tue, 28 Oct 2008 11:21:59 -0500 "Serge E. Hallyn" <[email protected]> wrote:

The tree is up at:

git://git.kernel.org/pub/scm/linux/kernel/git/sergeh/userns-2.6#next

I have added this today.

Quoted 1 line

with just two patches on top of David's creds-v4.

This will be OK as long as David does not rebase his tree ...

Signature · 3 lines
Cheers,
Stephen Rothwell                    [email protected]
http://www.canb.auug.org.au/~sfr/