grub2/0020-trim-arp-packets-with-abnormal-size.patch
Peter Jones 15a207211f Roll upstream's patches into one big patch here.
I don't really need to watch 150+ patches from upstream get applied.

Signed-off-by: Peter Jones <pjones@redhat.com>
2018-07-31 10:57:52 -04:00

28 lines
1.1 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Paulo Flabiano Smorigo <pfsmorigo@br.ibm.com>
Date: Wed, 5 Feb 2014 09:42:42 -0200
Subject: [PATCH] trim arp packets with abnormal size
GRUB uses arp request to create the arp response. If the incoming packet
is foobared, GRUB needs to trim the arp response packet before sending it.
---
grub-core/net/arp.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/grub-core/net/arp.c b/grub-core/net/arp.c
index 54306e3b16d..d1c69ed2b55 100644
--- a/grub-core/net/arp.c
+++ b/grub-core/net/arp.c
@@ -150,6 +150,12 @@ grub_net_arp_receive (struct grub_net_buff *nb, struct grub_net_card *card,
if (grub_net_addr_cmp (&inf->address, &target_addr) == 0
&& arp_packet->op == grub_cpu_to_be16_compile_time (ARP_REQUEST))
{
+ if ((nb->tail - nb->data) > 50)
+ {
+ grub_dprintf ("net", "arp packet with abnormal size (%ld bytes).\n",
+ nb->tail - nb->data);
+ nb->tail = nb->data + 50;
+ }
grub_net_link_level_address_t target;
struct grub_net_buff nb_reply;
struct arppkt *arp_reply;