diff options
| author | Jack Schwartz <jack.schwartz@oracle.com> | 2017-12-21 09:25:15 -0800 |
|---|---|---|
| committer | Michael Roth <mdroth@linux.vnet.ibm.com> | 2018-06-20 20:45:00 -0500 |
| commit | 059a6962b2f8cc2560af82e66235b36304b53350 (patch) | |
| tree | 79a581fae9c967751111ce757952942a6277aaa3 | |
| parent | ab2dfe8d17c3f0c5788c4d52d1265eb6bcb65550 (diff) | |
multiboot: bss_end_addr can be zero
The multiboot spec (https://www.gnu.org/software/grub/manual/multiboot/),
section 3.1.3, allows for bss_end_addr to be zero.
A zero bss_end_addr signifies there is no .bss section.
Suggested-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Jack Schwartz <jack.schwartz@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 2a8fcd119eb7c6bb3837fc3669eb1b2dfb31daf8)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
| -rw-r--r-- | hw/i386/multiboot.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/hw/i386/multiboot.c b/hw/i386/multiboot.c index c7b70c91d5..ff2733d12e 100644 --- a/hw/i386/multiboot.c +++ b/hw/i386/multiboot.c @@ -233,12 +233,6 @@ int load_multiboot(FWCfgState *fw_cfg, mh_entry_addr = ldl_p(header+i+28); if (mh_load_end_addr) { - if (mh_bss_end_addr < mh_load_addr) { - fprintf(stderr, "invalid mh_bss_end_addr address\n"); - exit(1); - } - mb_kernel_size = mh_bss_end_addr - mh_load_addr; - if (mh_load_end_addr < mh_load_addr) { fprintf(stderr, "invalid mh_load_end_addr address\n"); exit(1); @@ -249,8 +243,16 @@ int load_multiboot(FWCfgState *fw_cfg, fprintf(stderr, "invalid kernel_file_size\n"); exit(1); } - mb_kernel_size = kernel_file_size - mb_kernel_text_offset; - mb_load_size = mb_kernel_size; + mb_load_size = kernel_file_size - mb_kernel_text_offset; + } + if (mh_bss_end_addr) { + if (mh_bss_end_addr < (mh_load_addr + mb_load_size)) { + fprintf(stderr, "invalid mh_bss_end_addr address\n"); + exit(1); + } + mb_kernel_size = mh_bss_end_addr - mh_load_addr; + } else { + mb_kernel_size = mb_load_size; } /* Valid if mh_flags sets MULTIBOOT_HEADER_HAS_VBE. |