From 2e710cea6820e4caf625e0212a8834139f166f29 Mon Sep 17 00:00:00 2001 From: Doug Ledford Date: Wed, 5 Oct 2011 11:42:32 +1100 Subject: [PATCH] ipc/mqueue: switch back to using non-max values on create Commit b231cca4381ee15e ("message queues: increase range limits") changed how we create a queue that does not include an attr struct passed to open so that it creates the queue with whatever the maximum values are. However, if the admin has set the maximums to allow flexibility in creating a queue (aka, both a large size and large queue are allowed, but combined they create a queue too large for the RLIMIT_MSGQUEUE of the user), then attempts to create a queue without an attr struct will fail. Switch back to using acceptable defaults regardless of what the maximums are. Signed-off-by: Doug Ledford Cc: Amerigo Wang Cc: Serge E. Hallyn Cc: Joe Korty Cc: Manfred Spraul Signed-off-by: Andrew Morton --- include/linux/ipc_namespace.h | 2 ++ ipc/mqueue.c | 5 +++-- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h index 1372b566e1e1..bde094ee7b0e 100644 --- a/include/linux/ipc_namespace.h +++ b/include/linux/ipc_namespace.h @@ -95,9 +95,11 @@ extern int mq_init_ns(struct ipc_namespace *ns); #define DFLT_QUEUESMAX 256 /* max number of message queues */ #define HARD_QUEUESMAX 1024 #define MIN_MSGMAX 1 +#define DFLT_MSG 10U #define DFLT_MSGMAX 10 /* max number of messages in each queue */ #define HARD_MSGMAX (32768*sizeof(void *)/4) #define MIN_MSGSIZEMAX 128 +#define DFLT_MSGSIZE 8192U #define DFLT_MSGSIZEMAX 8192 /* max message size */ #define HARD_MSGSIZEMAX (8192*128) #else diff --git a/ipc/mqueue.c b/ipc/mqueue.c index ed049ea568f4..c6597fc42861 100644 --- a/ipc/mqueue.c +++ b/ipc/mqueue.c @@ -142,8 +142,9 @@ static struct inode *mqueue_get_inode(struct super_block *sb, info->qsize = 0; info->user = NULL; /* set when all is ok */ memset(&info->attr, 0, sizeof(info->attr)); - info->attr.mq_maxmsg = ipc_ns->mq_msg_max; - info->attr.mq_msgsize = ipc_ns->mq_msgsize_max; + info->attr.mq_maxmsg = min(ipc_ns->mq_msg_max, DFLT_MSG); + info->attr.mq_msgsize = + min(ipc_ns->mq_msgsize_max, DFLT_MSGSIZE); if (attr) { info->attr.mq_maxmsg = attr->mq_maxmsg; info->attr.mq_msgsize = attr->mq_msgsize; -- 2.39.5