|
 |
6e672b |
From c36441a8376c6edddf4d1bc1ef27e132e71e4ddd Mon Sep 17 00:00:00 2001
|
|
|
6e672b |
From: Kevin Wolf <kwolf@redhat.com>
|
|
|
6e672b |
Date: Thu, 26 Jul 2018 16:24:43 +0200
|
|
|
6e672b |
Subject: [PATCH 1/8] multiboot: bss_end_addr can be zero
|
|
|
6e672b |
|
|
|
6e672b |
RH-Author: Kevin Wolf <kwolf@redhat.com>
|
|
|
6e672b |
Message-id: <20180726162448.22072-2-kwolf@redhat.com>
|
|
|
6e672b |
Patchwork-id: 81517
|
|
|
6e672b |
O-Subject: [RHEL-7.6/7.5.z qemu-kvm PATCH 1/6] multiboot: bss_end_addr can be zero
|
|
|
6e672b |
Bugzilla: 1549824
|
|
|
6e672b |
RH-Acked-by: John Snow <jsnow@redhat.com>
|
|
|
6e672b |
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
|
|
|
6e672b |
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
|
|
|
6e672b |
|
|
|
6e672b |
From: Jack Schwartz <jack.schwartz@oracle.com>
|
|
|
6e672b |
|
|
|
6e672b |
The multiboot spec (https://www.gnu.org/software/grub/manual/multiboot/),
|
|
|
6e672b |
section 3.1.3, allows for bss_end_addr to be zero.
|
|
|
6e672b |
|
|
|
6e672b |
A zero bss_end_addr signifies there is no .bss section.
|
|
|
6e672b |
|
|
|
6e672b |
Suggested-by: Daniel Kiper <daniel.kiper@oracle.com>
|
|
|
6e672b |
Signed-off-by: Jack Schwartz <jack.schwartz@oracle.com>
|
|
|
6e672b |
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
|
|
|
6e672b |
Reviewed-by: Prasad J Pandit <pjp@fedoraproject.org>
|
|
|
6e672b |
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
|
|
|
6e672b |
(cherry picked from commit 2a8fcd119eb7c6bb3837fc3669eb1b2dfb31daf8)
|
|
|
6e672b |
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
|
|
|
6e672b |
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
|
|
|
6e672b |
---
|
|
|
6e672b |
hw/i386/multiboot.c | 18 ++++++++++--------
|
|
|
6e672b |
1 file changed, 10 insertions(+), 8 deletions(-)
|
|
|
6e672b |
|
|
|
6e672b |
diff --git a/hw/i386/multiboot.c b/hw/i386/multiboot.c
|
|
|
6e672b |
index 7eec230..9a9a2e1 100644
|
|
|
6e672b |
--- a/hw/i386/multiboot.c
|
|
|
6e672b |
+++ b/hw/i386/multiboot.c
|
|
|
6e672b |
@@ -212,12 +212,6 @@ int load_multiboot(FWCfgState *fw_cfg,
|
|
|
6e672b |
mh_entry_addr = ldl_p(header+i+28);
|
|
|
6e672b |
|
|
|
6e672b |
if (mh_load_end_addr) {
|
|
|
6e672b |
- if (mh_bss_end_addr < mh_load_addr) {
|
|
|
6e672b |
- fprintf(stderr, "invalid mh_bss_end_addr address\n");
|
|
|
6e672b |
- exit(1);
|
|
|
6e672b |
- }
|
|
|
6e672b |
- mb_kernel_size = mh_bss_end_addr - mh_load_addr;
|
|
|
6e672b |
-
|
|
|
6e672b |
if (mh_load_end_addr < mh_load_addr) {
|
|
|
6e672b |
fprintf(stderr, "invalid mh_load_end_addr address\n");
|
|
|
6e672b |
exit(1);
|
|
|
6e672b |
@@ -228,8 +222,16 @@ int load_multiboot(FWCfgState *fw_cfg,
|
|
|
6e672b |
fprintf(stderr, "invalid kernel_file_size\n");
|
|
|
6e672b |
exit(1);
|
|
|
6e672b |
}
|
|
|
6e672b |
- mb_kernel_size = kernel_file_size - mb_kernel_text_offset;
|
|
|
6e672b |
- mb_load_size = mb_kernel_size;
|
|
|
6e672b |
+ mb_load_size = kernel_file_size - mb_kernel_text_offset;
|
|
|
6e672b |
+ }
|
|
|
6e672b |
+ if (mh_bss_end_addr) {
|
|
|
6e672b |
+ if (mh_bss_end_addr < (mh_load_addr + mb_load_size)) {
|
|
|
6e672b |
+ fprintf(stderr, "invalid mh_bss_end_addr address\n");
|
|
|
6e672b |
+ exit(1);
|
|
|
6e672b |
+ }
|
|
|
6e672b |
+ mb_kernel_size = mh_bss_end_addr - mh_load_addr;
|
|
|
6e672b |
+ } else {
|
|
|
6e672b |
+ mb_kernel_size = mb_load_size;
|
|
|
6e672b |
}
|
|
|
6e672b |
|
|
|
6e672b |
/* Valid if mh_flags sets MULTIBOOT_HEADER_HAS_VBE.
|
|
|
6e672b |
--
|
|
|
6e672b |
1.8.3.1
|
|
|
6e672b |
|