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AVB blobs expect to be 4096-byte aligned

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topjohnwu 2021-11-28 13:21:05 -08:00
parent 1c8ebfacb0
commit 0a28dfe1e2
1 changed files with 8 additions and 3 deletions
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11
native/jni/magiskboot/bootimg.cpp
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@ -504,8 +504,10 @@ int unpack(const char *image, bool skip_decomp, bool hdr) {
return boot.flags[CHROMEOS_FLAG] ? 2 : 0;
}
#define file_align() \
write_zero(fd, align_off(lseek(fd, 0, SEEK_CUR) - off.header, boot.hdr->page_size()))
#define file_align_with(page_size) \
write_zero(fd, align_off(lseek(fd, 0, SEEK_CUR) - off.header, page_size))
#define file_align() file_align_with(boot.hdr->page_size())
void repack(const char *src_img, const char *out_img, bool skip_comp) {
const boot_img boot(src_img);
@ -682,8 +684,11 @@ void repack(const char *src_img, const char *out_img, bool skip_comp) {
file_align();
// vbmeta
off.vbmeta = lseek(fd, 0, SEEK_CUR);
if (boot.flags[AVB_FLAG]) {
// According to avbtool.py, if the input is not an Android sparse image
// (which boot images are not), the default block size is 4096
file_align_with(4096);
off.vbmeta = lseek(fd, 0, SEEK_CUR);
uint64_t vbmeta_size = __builtin_bswap64(boot.avb_footer->vbmeta_size);
xwrite(fd, boot.avb_meta, vbmeta_size);
}