linux-kernel - [PATCH 2/2] ipc, msg: forbid negative values for "msgmax"

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Date:	Sat,  2 Nov 2013 22:26:39 +0100
From:	Mathias Krause <minipli@...glemail.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Davidlohr Bueso <davidlohr@...com>,
	Pax Team <pageexec@...email.hu>,
	Brad Spengler <spender@...ecurity.net>,
	linux-kernel@...r.kernel.org,
	Mathias Krause <minipli@...glemail.com>
Subject: [PATCH 2/2] ipc, msg: forbid negative values for "msgmax"

Negative message lengths make no sense, prevent them from being set.
They do more harm than gain.

In case a user wants to have "unlimited" message sizes she should
just use INT_MAX instead.

Signed-off-by: Mathias Krause <minipli@...glemail.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 ipc/ipc_sysctl.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/ipc/ipc_sysctl.c b/ipc/ipc_sysctl.c
index 130dfec..76823b8 100644
--- a/ipc/ipc_sysctl.c
+++ b/ipc/ipc_sysctl.c
@@ -158,9 +158,7 @@ static int proc_ipcauto_dointvec_minmax(ctl_table *table, int write,
 
 static int zero;
 static int one = 1;
-#ifdef CONFIG_CHECKPOINT_RESTORE
 static int int_max = INT_MAX;
-#endif
 
 static struct ctl_table ipc_kern_table[] = {
 	{
@@ -198,7 +196,9 @@ static struct ctl_table ipc_kern_table[] = {
 		.data		= &init_ipc_ns.msg_ctlmax,
 		.maxlen		= sizeof (init_ipc_ns.msg_ctlmax),
 		.mode		= 0644,
-		.proc_handler	= proc_ipc_dointvec,
+		.proc_handler	= proc_ipc_dointvec_minmax,
+		.extra1		= &zero,
+		.extra2		= &int_max,
 	},
 	{
 		.procname	= "msgmni",
-- 
1.7.10.4

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