grub2/0077-trim-arp-packets-with-abnormal-size.patch
Javier Martinez Canillas db7cf3a089
More fixes for BLS
Add some fixes for BLS parsing logic and also make 20-grub.install script
to query the relative path of the kernel and initramfs images, so BLS can
also work when /boot is not a mount point or is a btrfs subvolume.

Also pull some build fixes.

Resolves: rhbz#1588184

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
2018-06-07 19:02:21 +02:00

31 lines
1.1 KiB
Diff

From 571a6cce3b0d4c8abf11efc320e2de6ff9188d60 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 077/243] 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;
--
2.17.1