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mkimage: zero fill alignment space

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This did not cause real problem but is good for reproducible builds. I hit
it with recent bootinfoscript that displays embedded config; I was puzzled
by random garbage at the end.

Prezero memory buffer used to assemble core.img. This makes individual
memset redundant. Also ensure buffer is filled with zeroes in several other
places.

Also remove redundant zeroing code where we fill in the whole memory block
anyway.
This commit is contained in:
Andrei Borzenkov 2015-11-06 21:33:28 +03:00
parent cd6d79cda2
commit 1018e91dce
2 changed files with 11 additions and 22 deletions
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3
util/grub-mkimagexx.c
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@ -101,7 +101,7 @@ SUFFIX (generate_elf) (const struct grub_install_image_target_desc *image_target
program_size = ALIGN_ADDR (*core_size);
elf_img = xmalloc (program_size + header_size + footer_size);
memset (elf_img, 0, program_size + header_size);
memset (elf_img, 0, program_size + header_size + footer_size);
memcpy (elf_img + header_size, *core_img, *core_size);
ehdr = (void *) elf_img;
phdr = (void *) (elf_img + sizeof (*ehdr));
@ -1587,6 +1587,7 @@ SUFFIX (load_image) (const char *kernel_path, size_t *exec_size,
}
out_img = xmalloc (*kernel_sz + total_module_size);
memset (out_img, 0, *kernel_sz + total_module_size);
if (image_target->id == IMAGE_EFI)
{