Subject: Re: [stable] [BUG] net: fix /proc/net/snmp as memory corruptor

From: Greg KH <[email-masked]>
Date: Fri, 14 Nov 2008 22:02:37 -0800

On Sat, Nov 15, 2008 at 06:25:33AM +0100, Eric Dumazet wrote:
> Greg KH a écrit :
>> On Fri, Nov 14, 2008 at 06:08:48AM +0100, Eric Dumazet wrote:
>>> Hello Greg
>>>
>>> A patch was submited about /proc/net/snmp being a memory corruptor and 
>>> not SMP safe
>>>
>>> (commit b971e7ac834e9f4bda96d5a96ae9abccd01c1dd8)
>>>
>>> These bugs are present on 2.6.26 & 2.6.27.
>> I looking at this, it doesn't seem to apply at all to the .27 tree.  If
>> David doesn't object, care to backport it there and send it to
>> [email-masked]?
>
> Strange... I just tried to apply patch on top of a fresh linux-2.6.27.6 
> tree and got no error
>
> # patch -p1 < /tmp/icmp_snmp.patch
> patching file net/ipv4/proc.c
> #

I've attached the patch I tried to apply below.  It fails with:
	$ patch -p1 --dry-run < ../net-fix-proc-net-snmp-as-memory-corruptor.patch 
	patching file net/ipv4/proc.c
	Hunk #1 FAILED at 237.
	1 out of 1 hunk FAILED -- saving rejects to file net/ipv4/proc.c.rej

Any thoughts?

thanks,

greg k-h
>>From b971e7ac834e9f4bda96d5a96ae9abccd01c1dd8 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <[email-masked]>
Date: Mon, 10 Nov 2008 21:43:08 -0800
Subject: net: fix /proc/net/snmp as memory corruptor

From: Eric Dumazet <[email-masked]>

commit b971e7ac834e9f4bda96d5a96ae9abccd01c1dd8 upstream.

icmpmsg_put() can happily corrupt kernel memory, using a static
table and forgetting to reset an array index in a loop.

Remove the static array since its not safe without proper locking.

Signed-off-by: Alexey Dobriyan <[email-masked]>
Signed-off-by: Eric Dumazet <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
Signed-off-by: Greg Kroah-Hartman <[email-masked]>

--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -237,43 +237,45 @@ static const struct snmp_mib snmp4_net_list[] = {
 	SNMP_MIB_SENTINEL
 };
 
+static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
+			     unsigned short *type, int count)
+{
+	int j;
+
+	if (count) {
+		seq_printf(seq, "nIcmpMsg:");
+		for (j = 0; j < count; ++j)
+			seq_printf(seq, " %sType%u",
+				type[j] & 0x100 ? "Out" : "In",
+				type[j] & 0xff);
+		seq_printf(seq, "nIcmpMsg:");
+		for (j = 0; j < count; ++j)
+			seq_printf(seq, " %lu", vals[j]);
+	}
+}
+
 static void icmpmsg_put(struct seq_file *seq)
 {
 #define PERLINE	16
 
-	int j, i, count;
-	static int out[PERLINE];
+	int i, count;
+	unsigned short type[PERLINE];
+	unsigned long vals[PERLINE], val;
 	struct net *net = seq->private;
 
 	count = 0;
 	for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
-
-		if (snmp_fold_field((void **) net->mib.icmpmsg_statistics, i))
-			out[count++] = i;
-		if (count < PERLINE)
-			continue;
-
-		seq_printf(seq, "nIcmpMsg:");
-		for (j = 0; j < PERLINE; ++j)
-			seq_printf(seq, " %sType%u", i & 0x100 ? "Out" : "In",
-					i & 0xff);
-		seq_printf(seq, "nIcmpMsg: ");
-		for (j = 0; j < PERLINE; ++j)
-			seq_printf(seq, " %lu",
-				snmp_fold_field((void **) net->mib.icmpmsg_statistics,
-				out[j]));
-		seq_putc(seq, 'n');
-	}
-	if (count) {
-		seq_printf(seq, "nIcmpMsg:");
-		for (j = 0; j < count; ++j)
-			seq_printf(seq, " %sType%u", out[j] & 0x100 ? "Out" 
-				"In", out[j] & 0xff);
-		seq_printf(seq, "nIcmpMsg:");
-		for (j = 0; j < count; ++j)
-			seq_printf(seq, " %lu", snmp_fold_field((void **)
-				net->mib.icmpmsg_statistics, out[j]));
+		val = snmp_fold_field((void **) net->mib.icmpmsg_statistics, i);
+		if (val) {
+			type[count] = i;
+			vals[count++] = val;
+		}
+		if (count == PERLINE) {
+			icmpmsg_put_line(seq, vals, type, count);
+			count = 0;
+		}
 	}
+	icmpmsg_put_line(seq, vals, type, count);
 
 #undef PERLINE
 }