linux-kernel - [PATCH v1 2/4] ipc: Use proper ipc namespace

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Date:   Fri, 22 Apr 2022 14:53:38 +0200
From:   Alexey Gladkov <legion@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Alexander Mikhalitsyn <alexander.mikhalitsyn@...tuozzo.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Daniel Walsh <dwalsh@...hat.com>,
        Davidlohr Bueso <dbueso@...e.de>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Linux Containers <containers@...ts.linux.dev>,
        Manfred Spraul <manfred@...orfullife.com>,
        Serge Hallyn <serge@...lyn.com>,
        Varad Gautam <varad.gautam@...e.com>,
        Vasily Averin <vvs@...tuozzo.com>
Subject: [PATCH v1 2/4] ipc: Use proper ipc namespace

As Eric Biederman pointed out, changing the namespace broke checkpoint
restore. I have reverted my previous changes.

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
Signed-off-by: Alexey Gladkov <legion@...nel.org>
---
 ipc/ipc_sysctl.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/ipc/ipc_sysctl.c b/ipc/ipc_sysctl.c
index eb7ba8e0a355..ff99d0305a5b 100644
--- a/ipc/ipc_sysctl.c
+++ b/ipc/ipc_sysctl.c
@@ -72,7 +72,7 @@ static int proc_ipc_sem_dointvec(struct ctl_table *table, int write,
 static int proc_ipc_dointvec_minmax_checkpoint_restore(struct ctl_table *table,
 		int write, void *buffer, size_t *lenp, loff_t *ppos)
 {
-	struct ipc_namespace *ns = table->extra1;
+	struct ipc_namespace *ns = current->nsproxy->ipc_ns;
 	struct ctl_table ipc_table;
 
 	if (write && !checkpoint_restore_ns_capable(ns->user_ns))
@@ -244,15 +244,12 @@ bool setup_ipc_sysctls(struct ipc_namespace *ns)
 #ifdef CONFIG_CHECKPOINT_RESTORE
 			} else if (tbl[i].data == &init_ipc_ns.ids[IPC_SEM_IDS].next_id) {
 				tbl[i].data = &ns->ids[IPC_SEM_IDS].next_id;
-				tbl[i].extra1 = ns;
 
 			} else if (tbl[i].data == &init_ipc_ns.ids[IPC_MSG_IDS].next_id) {
 				tbl[i].data = &ns->ids[IPC_MSG_IDS].next_id;
-				tbl[i].extra1 = ns;
 
 			} else if (tbl[i].data == &init_ipc_ns.ids[IPC_SHM_IDS].next_id) {
 				tbl[i].data = &ns->ids[IPC_SHM_IDS].next_id;
-				tbl[i].extra1 = ns;
 #endif
 			} else {
 				tbl[i].data = NULL;
-- 
2.33.2