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lib/elf: Add additional ELF type sanity checks

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This commit is contained in:
mintsuki 2024-06-27 13:59:19 +02:00
parent 11ed4be0cb
commit 3c0b3f5e31
1 changed files with 17 additions and 1 deletions
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18
common/lib/elf.c
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@ -238,10 +238,14 @@ static bool elf64_is_relocatable(uint8_t *elf, struct elf64_hdr *hdr) {
continue;
}
if (phdr->p_filesz == 0) {
panic(true, "elf: ELF file type is ET_DYN, but PT_DYNAMIC segment has 0 size");
}
return true;
}
return false;
panic(true, "elf: ELF file type is ET_DYN, but PT_DYNAMIC segment missing");
}
static bool elf64_apply_relocations(uint8_t *elf, struct elf64_hdr *hdr, void *buffer, uint64_t vaddr, size_t size, uint64_t slide) {
@ -670,6 +674,10 @@ bool elf64_load(uint8_t *elf, uint64_t *entry_point, uint64_t *_slide, uint32_t
elf64_validate(hdr);
if (hdr->type != ET_EXEC && hdr->type != ET_DYN) {
panic(true, "elf: ELF file not of type ET_EXEC nor ET_DYN");
}
if (is_reloc) {
*is_reloc = false;
}
@ -862,6 +870,10 @@ bool elf32_load_elsewhere(uint8_t *elf, uint64_t *entry_point,
elf32_validate(hdr);
if (hdr->type != ET_EXEC) {
panic(true, "elf: ELF file not of type ET_EXEC");
}
for (size_t i = 0; i < hdr->ph_num; i++) {
struct elf32_phdr *phdr = (void *)elf + (hdr->phoff + i * hdr->phdr_size);
@ -935,6 +947,10 @@ bool elf64_load_elsewhere(uint8_t *elf, uint64_t *entry_point,
elf64_validate(hdr);
if (hdr->type != ET_EXEC) {
panic(true, "elf: ELF file not of type ET_EXEC");
}
for (size_t i = 0; i < hdr->ph_num; i++) {
struct elf64_phdr *phdr = (void *)elf + (hdr->phoff + i * hdr->phdr_size);