diff options
| author | Matt Fleming <matt@console-pimps.org> | 2014-04-08 13:14:00 +0100 |
|---|---|---|
| committer | Show Liu <show.liu@linaro.org> | 2014-06-18 11:40:36 +0800 |
| commit | 246a45af8f122b7874e56043fe6e784357996775 (patch) | |
| tree | b068a67aaedad70ce4ce2602678d331f9c75642a /arch/x86/boot/compressed/eboot.c | |
| parent | 8ca4ef571d3e77e177a45a386fb8e84664e0dace (diff) | |
x86/efi: Correct EFI boot stub use of code32_start
commit 7e8213c1f3acc064aef37813a39f13cbfe7c3ce7 upstream.
code32_start should point at the start of the protected mode code, and
*not* at the beginning of the bzImage. This is much easier to do in
assembly so document that callers of make_boot_params() need to fill out
code32_start.
The fallout from this bug is that we would end up relocating the image
but copying the image at some offset, resulting in what appeared to be
memory corruption.
Reported-by: Thomas Bächler <thomas@archlinux.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86/boot/compressed/eboot.c')
| -rw-r--r-- | arch/x86/boot/compressed/eboot.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c index a7677babf94..78cbb2db5a8 100644 --- a/arch/x86/boot/compressed/eboot.c +++ b/arch/x86/boot/compressed/eboot.c @@ -425,6 +425,9 @@ void setup_graphics(struct boot_params *boot_params) * Because the x86 boot code expects to be passed a boot_params we * need to create one ourselves (usually the bootloader would create * one for us). + * + * The caller is responsible for filling out ->code32_start in the + * returned boot_params. */ struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table) { @@ -483,8 +486,6 @@ struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table) hdr->vid_mode = 0xffff; hdr->boot_flag = 0xAA55; - hdr->code32_start = (__u64)(unsigned long)image->image_base; - hdr->type_of_loader = 0x21; /* Convert unicode cmdline to ascii */ |