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authorKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>2012-05-31 16:26:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-31 17:49:31 -0700
commite6315bb154e778391ce64b194756bd3d108dadf6 (patch)
tree6b0df724ed5e52058f61261d93f807ea0ee77d11
parent5b5c4d1a1440e94994c73dddbad7be0676cd8b9a (diff)
mqueue: revert bump up DFLT_*MAX
Mqueue limitation is slightly naieve parameter likes other ipcs because unprivileged user can consume kernel memory by using ipcs. Thus, too aggressive raise bring us security issue. Example, current setting allow evil unprivileged user use 256GB (= 256 * 1024 * 1024*1024) and it's enough large to system will belome unresponsive. Don't do that. Instead, every admin should adjust the knobs for their own systems. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by: Doug Ledford <dledford@redhat.com> Acked-by: Joe Korty <joe.korty@ccur.com> Cc: Amerigo Wang <amwang@redhat.com> Acked-by: Serge E. Hallyn <serue@us.ibm.com> Cc: Jiri Slaby <jslaby@suse.cz> Cc: Manfred Spraul <manfred@colorfullife.com> Cc: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/ipc_namespace.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h
index 6e1dd08194fd..2488535a32a3 100644
--- a/include/linux/ipc_namespace.h
+++ b/include/linux/ipc_namespace.h
@@ -118,12 +118,12 @@ extern int mq_init_ns(struct ipc_namespace *ns);
#define DFLT_QUEUESMAX 256
#define HARD_QUEUESMAX 1024
#define MIN_MSGMAX 1
-#define DFLT_MSG 64U
-#define DFLT_MSGMAX 1024
+#define DFLT_MSG 10U
+#define DFLT_MSGMAX 10
#define HARD_MSGMAX 65536
#define MIN_MSGSIZEMAX 128
#define DFLT_MSGSIZE 8192U
-#define DFLT_MSGSIZEMAX (1024*1024)
+#define DFLT_MSGSIZEMAX 8192
#define HARD_MSGSIZEMAX (16*1024*1024)
#else
static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }