d108ec594a
- Introduces a new package, grub2-x86_64-efi-bls, which includes a straightforward grubbls.efi file. This file can be copied to the EFI System Partition (ESP) along with boot fragments in the Boot Loader Specification (BLS) format * 0001-Streamline-BLS-and-improve-PCR-stability.patch - Fix crash in bli module (bsc#1226497) * 0001-bli-Fix-crash-in-get_part_uuid.patch - Rework package dependencies: grub2-common now includes common userland utilities and is required by grub2 platform packages. grub2 is now a meta package that pulls in the default platform package. OBS-URL: https://build.opensuse.org/request/show/1196023 OBS-URL: https://build.opensuse.org/package/show/Base:System/grub2?expand=0&rev=512
59 lines
1.7 KiB
Diff
59 lines
1.7 KiB
Diff
From b5c3492f31a98f5ef0f9bec2c0665ad0b71ad5cb Mon Sep 17 00:00:00 2001
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From: Sebastian Krahmer <krahmer@suse.com>
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Date: Tue, 28 Nov 2017 17:24:38 +0800
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Subject: [PATCH] AUDIT-0: http boot tracker bug
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Fixing a memory leak in case of error, and a integer overflow, leading to a
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heap overflow due to overly large chunk sizes.
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We need to check against some maximum value, otherwise values like 0xffffffff
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will eventually lead in the allocation functions to small sized buffers, since
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the len is rounded up to the next reasonable alignment. The following memcpy
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will then smash the heap, leading to RCE.
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This is no big issue for pure http boot, since its going to execute an
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untrusted kernel anyway, but it will break trusted boot scenarios, where only
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signed code is allowed to be executed.
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v2: Fix GCC 13 build failure (bsc#1201089)
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Signed-off-by: Michael Chang <mchang@suse.com>
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---
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grub-core/net/efi/net.c | 4 +++-
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grub-core/net/http.c | 5 ++++-
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2 files changed, 7 insertions(+), 2 deletions(-)
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--- a/grub-core/net/efi/net.c
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+++ b/grub-core/net/efi/net.c
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@@ -654,8 +654,10 @@
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rd = efi_net_interface (read, file, chunk, sz);
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- if (rd <= 0)
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+ if (rd <= 0) {
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+ grub_free (chunk);
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return rd;
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+ }
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if (buf)
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{
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--- a/grub-core/net/http.c
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+++ b/grub-core/net/http.c
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@@ -30,6 +30,7 @@
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GRUB_MOD_LICENSE ("GPLv3+");
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#define HTTP_PORT ((grub_uint16_t) 80)
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+#define HTTP_MAX_CHUNK_SIZE GRUB_INT_MAX
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typedef struct http_data
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{
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@@ -82,6 +83,8 @@
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if (data->in_chunk_len == 2)
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{
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data->chunk_rem = grub_strtoul (ptr, 0, 16);
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+ if (data->chunk_rem > HTTP_MAX_CHUNK_SIZE)
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+ return GRUB_ERR_NET_PACKET_TOO_BIG;
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grub_errno = GRUB_ERR_NONE;
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if (data->chunk_rem == 0)
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{
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