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elf: Add overlapping PHDR detection

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This commit is contained in:
mintsuki 2022-10-10 04:35:28 +02:00
parent 96fe1aa2e0
commit 6022f5bf23
1 changed files with 26 additions and 0 deletions
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26
common/lib/elf.c
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@ -457,6 +457,32 @@ bool elf64_load(uint8_t *elf, uint64_t *entry_point, uint64_t *_slide, uint32_t
continue;
}
// check for overlapping phdrs
for (uint16_t j = 0; j < hdr->ph_num; j++) {
struct elf64_phdr *phdr_in = (void *)elf + (hdr->phoff + j * hdr->phdr_size);
if (phdr_in->p_type != PT_LOAD) {
continue;
}
// Drop entries not in the higher half
if (phdr_in->p_vaddr < FIXED_HIGHER_HALF_OFFSET_64) {
continue;
}
if (phdr_in == phdr) {
continue;
}
if ((phdr_in->p_vaddr >= phdr->p_vaddr
&& phdr_in->p_vaddr < phdr->p_vaddr + phdr->p_memsz)
||
(phdr_in->p_vaddr + phdr_in->p_memsz > phdr->p_vaddr
&& phdr_in->p_vaddr + phdr_in->p_memsz <= phdr->p_vaddr + phdr->p_memsz)) {
panic(true, "elf: Attempted to load ELF file with overlapping PHDRs (%u and %u overlap)", i, j);
}
}
if (phdr->p_vaddr < min_vaddr) {
min_vaddr = phdr->p_vaddr;
}