kexec bzImage path setup data is shared with real-mode path, and
setup_header is copied together with setup_code.
Later 32bit just use whole area as boot_params for real_mode_data.
but those area for boot_params around setup_header is
not cleaned that will leave some field in boot_param as
non-zero value.
So clean whole buffer at first, and only copy setup_header for non
real-mode entry path.
Signed-off-by: Yinghai Lu <ying...@kernel.org>
---
kexec/arch/i386/kexec-bzImage.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/kexec/arch/i386/kexec-bzImage.c b/kexec/arch/i386/kexec-bzImage.c
index 83a023d..35005c7 100644
--- a/kexec/arch/i386/kexec-bzImage.c
+++ b/kexec/arch/i386/kexec-bzImage.c
@@ -211,7 +211,19 @@ int do_bzImage_load(struct kexec_info *info,
/* The argument/parameter segment */
setup_size = kern16_size + command_line_len + PURGATORY_CMDLINE_SIZE;
real_mode = xmalloc(setup_size);
- memcpy(real_mode, kernel, kern16_size);
+ memset(real_mode, 0, setup_size);
+ if (!real_mode_entry) {
+ unsigned long setup_header_size = kernel[0x201] + 0x202 - 0x1f1;
+
+ /* only copy setup_header */
+ if (setup_header_size > 0x7f)
+ setup_header_size = 0x7f;
+ memcpy((unsigned char *)real_mode + 0x1f1, kernel + 0x1f1,
+ setup_header_size);
+ } else {
+ /* copy setup code and setup_header */
+ memcpy(real_mode, kernel, kern16_size);
+ }
if (info->kexec_flags & (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)) {
/* If using bzImage for capture kernel, then we will not be
--
1.7.10.4
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