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Diffstat (limited to '')
| -rw-r--r-- | debian/patches/0079-net-ip-Do-IP-fragment-maths-safely.patch | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/debian/patches/0079-net-ip-Do-IP-fragment-maths-safely.patch b/debian/patches/0079-net-ip-Do-IP-fragment-maths-safely.patch new file mode 100644 index 0000000..7c5d8dc --- /dev/null +++ b/debian/patches/0079-net-ip-Do-IP-fragment-maths-safely.patch @@ -0,0 +1,43 @@ +From 2a4f87df650fd2ef639b48b43fc834b97b6b2bfa Mon Sep 17 00:00:00 2001 +From: Daniel Axtens <dja@axtens.net> +Date: Mon, 20 Dec 2021 19:41:21 +1100 +Subject: net/ip: Do IP fragment maths safely + +This avoids an underflow and subsequent unpleasantness. + +Fixes: CVE-2022-28733 + +Signed-off-by: Daniel Axtens <dja@axtens.net> +Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com> +--- + grub-core/net/ip.c | 10 +++++++++- + 1 file changed, 9 insertions(+), 1 deletion(-) + +diff --git a/grub-core/net/ip.c b/grub-core/net/ip.c +index 01410798b..937be8767 100644 +--- a/grub-core/net/ip.c ++++ b/grub-core/net/ip.c +@@ -25,6 +25,7 @@ + #include <grub/net/netbuff.h> + #include <grub/mm.h> + #include <grub/priority_queue.h> ++#include <grub/safemath.h> + #include <grub/time.h> + + struct iphdr { +@@ -551,7 +552,14 @@ grub_net_recv_ip4_packets (struct grub_net_buff *nb, + { + rsm->total_len = (8 * (grub_be_to_cpu16 (iph->frags) & OFFSET_MASK) + + (nb->tail - nb->data)); +- rsm->total_len -= ((iph->verhdrlen & 0xf) * sizeof (grub_uint32_t)); ++ ++ if (grub_sub (rsm->total_len, (iph->verhdrlen & 0xf) * sizeof (grub_uint32_t), ++ &rsm->total_len)) ++ { ++ grub_dprintf ("net", "IP reassembly size underflow\n"); ++ return GRUB_ERR_NONE; ++ } ++ + rsm->asm_netbuff = grub_netbuff_alloc (rsm->total_len); + if (!rsm->asm_netbuff) + { |