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Validate that Multiboot 2 memory map tag entru size is not 0

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This commit is contained in:
Alex Kotov 2020-11-29 03:56:20 +05:00
parent 96d9f1e65e
commit 36dbe4b8a9
Signed by: kotovalexarian
GPG key ID: 553C0EBBEB5D5F08
2 changed files with 19 additions and 0 deletions
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1
src/multiboot2/is_valid.c
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@ -229,6 +229,7 @@ unsigned char KernAux_Multiboot2_Tag_MemoryMap_is_valid(
return (
tag->base.type == KERNAUX_MULTIBOOT2_TAGTYPE_MEMORY_MAP &&
tag->base.size >= 16 &&
tag->entry_size > 0 &&
tag->entry_size % 8 == 0 &&
(tag->base.size - 16) % tag->entry_size == 0
);

18
tests/test_multiboot2_validation.c
View file

@ -421,6 +421,16 @@ static const struct {
},
};
static const struct KernAux_Multiboot2_Tag_MemoryMap
tag_memory_map_with_empty_data_invalid_entry_size_zero = {
.base = {
.type = KERNAUX_MULTIBOOT2_TAGTYPE_MEMORY_MAP,
.size = 16,
},
.entry_size = 0,
.entry_version = 0,
};
static const struct KernAux_Multiboot2_Tag_MemoryMap
tag_memory_map_with_empty_data_invalid_entry_size_not_mul8 = {
.base = {
@ -938,6 +948,10 @@ int main()
&tag_memory_map_with_some_large_data_items_invalid_size.tag.base
));
assert(!KernAux_Multiboot2_TagBase_is_valid(
&tag_memory_map_with_empty_data_invalid_entry_size_zero.base
));
assert(!KernAux_Multiboot2_TagBase_is_valid(
&tag_memory_map_with_empty_data_invalid_entry_size_not_mul8.base
));
@ -1090,6 +1104,10 @@ int main()
&tag_memory_map_with_some_large_data_items_invalid_size.tag
));
assert(!KernAux_Multiboot2_Tag_MemoryMap_is_valid(
&tag_memory_map_with_empty_data_invalid_entry_size_zero
));
assert(!KernAux_Multiboot2_Tag_MemoryMap_is_valid(
&tag_memory_map_with_empty_data_invalid_entry_size_not_mul8
));