tailix/libkernaux
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This commit is contained in:
Alex Kotov 2022-01-13 19:41:50 +05:00
parent e3e42582b8
commit a6f8cbf6e7
1 changed files with 17 additions and 0 deletions
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17
src/multiboot2/header_is_valid.c
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@ -11,6 +11,14 @@
bool KernAux_Multiboot2_Header_is_valid( bool KernAux_Multiboot2_Header_is_valid(
const struct KernAux_Multiboot2_Header *const multiboot2_header const struct KernAux_Multiboot2_Header *const multiboot2_header
) { ) {
if (multiboot2_header->magic != KERNAUX_MULTIBOOT2_MAGIC) return false;
if (multiboot2_header->arch != KERNAUX_MULTIBOOT2_ARCH_I386 &&
multiboot2_header->arch != KERNAUX_MULTIBOOT2_ARCH_MIPS32)
{
return false;
}
if (multiboot2_header->total_size < if (multiboot2_header->total_size <
sizeof(struct KernAux_Multiboot2_Header) + sizeof(struct KernAux_Multiboot2_Header) +
sizeof(struct KernAux_Multiboot2_HTag_None)) sizeof(struct KernAux_Multiboot2_HTag_None))
@ -18,6 +26,15 @@ bool KernAux_Multiboot2_Header_is_valid(
return false; return false;
} }
if (multiboot2_header->checksum !=
KERNAUX_MULTIBOOT2_CHECKSUM(
multiboot2_header->arch,
multiboot2_header->total_size
)
) {
return false;
}
const struct KernAux_Multiboot2_HTagBase *tag_base = const struct KernAux_Multiboot2_HTagBase *tag_base =
(struct KernAux_Multiboot2_HTagBase*) (struct KernAux_Multiboot2_HTagBase*)
KERNAUX_MULTIBOOT2_DATA(multiboot2_header); KERNAUX_MULTIBOOT2_DATA(multiboot2_header);