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e1531466e1
This change updates grub to the 2.04 release. The new release changed how grub is built, so the bootstrap and bootstrap.conf files have to be added to the dist-git. Also, the gitignore file changed so it has to be updated. Since the patches have been forward ported to 2.04, there's no need for a logic to maintain a patch with the delta between the release and the grub master branch. So the release-to-master.patch is dropped and no longer is updated by the do-rebase script. Also since gnulib isn't part of the grub repository anymore and cloned by the boostrap tool, a gnulib tarball is included as other source file and copied before calling the bootstrap tool. That way grub can be built even in builders that only have access to the sources lookaside cache. Resolves: rhbz#1727279 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
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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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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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diff --git a/grub-core/net/efi/net.c b/grub-core/net/efi/net.c
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index 86bce6535d3..4bb308026ce 100644
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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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@@ -645,8 +645,10 @@ grub_efihttp_chunk_read (grub_file_t file, char *buf,
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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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diff --git a/grub-core/net/http.c b/grub-core/net/http.c
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index 00737c52750..c9c59690a98 100644
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--- a/grub-core/net/http.c
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+++ b/grub-core/net/http.c
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@@ -31,7 +31,8 @@ GRUB_MOD_LICENSE ("GPLv3+");
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enum
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{
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- HTTP_PORT = 80
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+ HTTP_PORT = 80,
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+ HTTP_MAX_CHUNK_SIZE = 0x80000000
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};
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@@ -78,6 +79,8 @@ parse_line (grub_file_t file, http_data_t data, char *ptr, grub_size_t len)
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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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