mirror of
https://src.fedoraproject.org/rpms/grub2.git
synced 2024-10-18 09:51:50 +00:00
1f092caba7
Add comments and revert logic changes in 01_fallback_counting Remove quotes when reading ID value from /etc/os-release Related: rhbz#1650706 blscfg: expand grub_users before passing to grub_normal_add_menu_entry() Resolves: rhbz#1650706 Drop buggy downstream patch "efinet: retransmit if our device is busy" Resolves: rhbz#1649048 Make the menu entry users option argument to be optional Related: rhbz#1652434 10_linux_bls: add missing menu entries options Resolves: rhbz#1652434 Drop "Be more aggro about actually using the *configured* network device." Resolves: rhbz#1654388 Fix menu entry selection based on title Resolves: rhbz#1654936 Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
62 lines
2 KiB
Diff
62 lines
2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Sebastian Krahmer <krahmer@suse.com>
|
|
Date: Tue, 28 Nov 2017 17:24:38 +0800
|
|
Subject: [PATCH] AUDIT-0: http boot tracker bug
|
|
|
|
Fixing a memory leak in case of error, and a integer overflow, leading to a
|
|
heap overflow due to overly large chunk sizes.
|
|
|
|
We need to check against some maximum value, otherwise values like 0xffffffff
|
|
will eventually lead in the allocation functions to small sized buffers, since
|
|
the len is rounded up to the next reasonable alignment. The following memcpy
|
|
will then smash the heap, leading to RCE.
|
|
|
|
This is no big issue for pure http boot, since its going to execute an
|
|
untrusted kernel anyway, but it will break trusted boot scenarios, where only
|
|
signed code is allowed to be executed.
|
|
|
|
Signed-off-by: Michael Chang <mchang@suse.com>
|
|
---
|
|
grub-core/net/efi/net.c | 4 +++-
|
|
grub-core/net/http.c | 5 ++++-
|
|
2 files changed, 7 insertions(+), 2 deletions(-)
|
|
|
|
diff --git a/grub-core/net/efi/net.c b/grub-core/net/efi/net.c
|
|
index 9e0078ac1c6..2bf15447fd5 100644
|
|
--- a/grub-core/net/efi/net.c
|
|
+++ b/grub-core/net/efi/net.c
|
|
@@ -645,8 +645,10 @@ grub_efihttp_chunk_read (grub_file_t file, char *buf,
|
|
|
|
rd = efi_net_interface (read, file, chunk, sz);
|
|
|
|
- if (rd <= 0)
|
|
+ if (rd <= 0) {
|
|
+ grub_free (chunk);
|
|
return rd;
|
|
+ }
|
|
|
|
if (buf)
|
|
{
|
|
diff --git a/grub-core/net/http.c b/grub-core/net/http.c
|
|
index 00737c52750..c9c59690a98 100644
|
|
--- a/grub-core/net/http.c
|
|
+++ b/grub-core/net/http.c
|
|
@@ -31,7 +31,8 @@ GRUB_MOD_LICENSE ("GPLv3+");
|
|
|
|
enum
|
|
{
|
|
- HTTP_PORT = 80
|
|
+ HTTP_PORT = 80,
|
|
+ HTTP_MAX_CHUNK_SIZE = 0x80000000
|
|
};
|
|
|
|
|
|
@@ -78,6 +79,8 @@ parse_line (grub_file_t file, http_data_t data, char *ptr, grub_size_t len)
|
|
if (data->in_chunk_len == 2)
|
|
{
|
|
data->chunk_rem = grub_strtoul (ptr, 0, 16);
|
|
+ if (data->chunk_rem > HTTP_MAX_CHUNK_SIZE)
|
|
+ return GRUB_ERR_NET_PACKET_TOO_BIG;
|
|
grub_errno = GRUB_ERR_NONE;
|
|
if (data->chunk_rem == 0)
|
|
{
|