The patch titled
userns: add a user namespace owner of ipc ns
has been added to the -mm tree. Its filename is
userns-add-a-user-namespace-owner-of-ipc-ns.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: userns: add a user namespace owner of ipc ns
From: "Serge E. Hallyn" <serge@xxxxxxxxxx>
Changelog:
Feb 15: Don't set new ipc->user_ns if we didn't create a new
ipc_ns.
Signed-off-by: Serge E. Hallyn <serge.hallyn@xxxxxxxxxxxxx>
Acked-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: James Morris <jmorris@xxxxxxxxx>
Cc: Kees Cook <kees.cook@xxxxxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/ipc_namespace.h | 3 +++
ipc/msgutil.c | 3 +++
ipc/namespace.c | 9 +++++++--
kernel/nsproxy.c | 5 +++++
4 files changed, 18 insertions(+), 2 deletions(-)
diff -puN include/linux/ipc_namespace.h~userns-add-a-user-namespace-owner-of-ipc-ns include/linux/ipc_namespace.h
--- a/include/linux/ipc_namespace.h~userns-add-a-user-namespace-owner-of-ipc-ns
+++ a/include/linux/ipc_namespace.h
@@ -24,6 +24,7 @@ struct ipc_ids {
struct idr ipcs_idr;
};
+struct user_namespace;
struct ipc_namespace {
atomic_t count;
struct ipc_ids ids[3];
@@ -56,6 +57,8 @@ struct ipc_namespace {
unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */
unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */
+ /* user_ns which owns the ipc ns */
+ struct user_namespace *user_ns;
};
extern struct ipc_namespace init_ipc_ns;
diff -puN ipc/msgutil.c~userns-add-a-user-namespace-owner-of-ipc-ns ipc/msgutil.c
--- a/ipc/msgutil.c~userns-add-a-user-namespace-owner-of-ipc-ns
+++ a/ipc/msgutil.c
@@ -20,6 +20,8 @@
DEFINE_SPINLOCK(mq_lock);
+extern struct user_namespace init_user_ns;
+
/*
* The next 2 defines are here bc this is the only file
* compiled when either CONFIG_SYSVIPC and CONFIG_POSIX_MQUEUE
@@ -32,6 +34,7 @@ struct ipc_namespace init_ipc_ns = {
.mq_msg_max = DFLT_MSGMAX,
.mq_msgsize_max = DFLT_MSGSIZEMAX,
#endif
+ .user_ns = &init_user_ns,
};
atomic_t nr_ipc_ns = ATOMIC_INIT(1);
diff -puN ipc/namespace.c~userns-add-a-user-namespace-owner-of-ipc-ns ipc/namespace.c
--- a/ipc/namespace.c~userns-add-a-user-namespace-owner-of-ipc-ns
+++ a/ipc/namespace.c
@@ -11,10 +11,11 @@
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/mount.h>
+#include <linux/user_namespace.h>
#include "util.h"
-static struct ipc_namespace *create_ipc_ns(void)
+static struct ipc_namespace *create_ipc_ns(struct ipc_namespace *old_ns)
{
struct ipc_namespace *ns;
int err;
@@ -43,6 +44,9 @@ static struct ipc_namespace *create_ipc_
ipcns_notify(IPCNS_CREATED);
register_ipcns_notifier(ns);
+ ns->user_ns = old_ns->user_ns;
+ get_user_ns(ns->user_ns);
+
return ns;
}
@@ -50,7 +54,7 @@ struct ipc_namespace *copy_ipcs(unsigned
{
if (!(flags & CLONE_NEWIPC))
return get_ipc_ns(ns);
- return create_ipc_ns();
+ return create_ipc_ns(ns);
}
/*
@@ -105,6 +109,7 @@ static void free_ipc_ns(struct ipc_names
* order to have a correct value when recomputing msgmni.
*/
ipcns_notify(IPCNS_REMOVED);
+ put_user_ns(ns->user_ns);
}
/*
diff -puN kernel/nsproxy.c~userns-add-a-user-namespace-owner-of-ipc-ns kernel/nsproxy.c
--- a/kernel/nsproxy.c~userns-add-a-user-namespace-owner-of-ipc-ns
+++ a/kernel/nsproxy.c
@@ -85,6 +85,11 @@ static struct nsproxy *create_new_namesp
err = PTR_ERR(new_nsp->ipc_ns);
goto out_ipc;
}
+ if (new_nsp->ipc_ns != tsk->nsproxy->ipc_ns) {
+ put_user_ns(new_nsp->ipc_ns->user_ns);
+ new_nsp->ipc_ns->user_ns = task_cred_xxx(tsk, user)->user_ns;
+ get_user_ns(new_nsp->ipc_ns->user_ns);
+ }
new_nsp->pid_ns = copy_pid_ns(flags, task_active_pid_ns(tsk));
if (IS_ERR(new_nsp->pid_ns)) {
_
Patches currently in -mm which might be from serge@xxxxxxxxxx are
lib-hexdumpc-make-hex2bin-return-the-updated-src-address.patch
fs-binfmt_miscc-use-kernels-hex_to_bin-method.patch
fs-binfmt_miscc-use-kernels-hex_to_bin-method-fix.patch
fs-binfmt_miscc-use-kernels-hex_to_bin-method-fix-fix.patch
pid-remove-the-child_reaper-special-case-in-init-mainc.patch
pidns-call-pid_ns_prepare_proc-from-create_pid_namespace.patch
procfs-kill-the-global-proc_mnt-variable.patch
userns-add-a-user_namespace-as-creator-owner-of-uts_namespace.patch
userns-security-make-capabilities-relative-to-the-user-namespace.patch
userns-allow-sethostname-in-a-container.patch
userns-allow-killing-tasks-in-your-own-or-child-userns.patch
userns-allow-ptrace-from-non-init-user-namespaces.patch
userns-user-namespaces-convert-all-capable-checks-in-kernel-sysc.patch
userns-add-a-user-namespace-owner-of-ipc-ns.patch
userns-user-namespaces-convert-several-capable-calls.patch
userns-userns-check-user-namespace-for-task-file-uid-equivalence-checks.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
