ipc: Use the same namespace to modify and validate

In the 1f5c135ee509 ("ipc: Store ipc sysctls in the ipc namespace") I
missed that in addition to the modification of sem_ctls[3], the change
is validated. This validation must occur in the same namespace.

Link: https://lore.kernel.org/lkml/875ymnvryb.fsf@email.froward.int.ebiederm.org/
Fixes: 1f5c135ee509 ("ipc: Store ipc sysctls in the ipc namespace")
Signed-off-by: Alexey Gladkov <legion@kernel.org>
Link: https://lkml.kernel.org/r/b3cb9a25cce6becbef77186bc1216071a08a969b.1651584847.git.legion@kernel.org
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

diff --git a/ipc/ipc_sysctl.c b/ipc/ipc_sysctl.c
index 15210ac47e9e11e37062f11b730f4fa5f1154097..d1d5204cf589371c22cbd53eb907fbcc0e91f90a 100644 (file)
--- a/ipc/ipc_sysctl.c
+++ b/ipc/ipc_sysctl.c
@@ -68,7 +68,7 @@ static int proc_ipc_sem_dointvec(struct ctl_table *table, int write,
        ret = proc_dointvec(table, write, buffer, lenp, ppos);
 
        if (!ret)
-               ret = sem_check_semmni(current->nsproxy->ipc_ns);
+               ret = sem_check_semmni(ns);
 
        /*
         * Reset the semmni value if an error happens.