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libdyld: fix hash+symtab sizes

This commit is contained in:
Astro 2020-05-01 03:20:19 +02:00
parent 92ae487143
commit b02c051007
1 changed files with 11 additions and 11 deletions
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22
firmware/libdyld/src/image.rs
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@ -79,16 +79,16 @@ impl Image {
pub fn dyn_section(&self, range: Range<usize>) -> Result<DynamicSection, Error> { pub fn dyn_section(&self, range: Range<usize>) -> Result<DynamicSection, Error> {
let (mut strtab_off, mut strtab_sz) = (0, 0); let (mut strtab_off, mut strtab_sz) = (0, 0);
let (mut symtab_off, mut symtab_sz) = (0, 0);
let (mut rel_off, mut rel_sz) = (0, 0); let (mut rel_off, mut rel_sz) = (0, 0);
let (mut rela_off, mut rela_sz) = (0, 0); let (mut rela_off, mut rela_sz) = (0, 0);
let (mut pltrel_off, mut pltrel_sz) = (0, 0); let (mut pltrel_off, mut pltrel_sz) = (0, 0);
let (mut hash_off, mut hash_sz) = (0, 0); let (mut hash_off, mut hash_sz) = (0, 0);
let mut sym_ent = 0; let mut symtab_off = 0;
let mut rel_ent = 0; let mut sym_ent = 0;
let mut rela_ent = 0; let mut rel_ent = 0;
let mut nbucket = 0; let mut rela_ent = 0;
let mut nchain = 0; let mut nbucket = 0;
let mut nchain = 0;
for dyn_header in self.dyn_headers(range) { for dyn_header in self.dyn_headers(range) {
let val = unsafe { dyn_header.d_un.d_val } as usize; let val = unsafe { dyn_header.d_un.d_val } as usize;
@ -112,12 +112,16 @@ impl Image {
nchain = *self.get_ref::<Elf32_Word>(val + 4) nchain = *self.get_ref::<Elf32_Word>(val + 4)
.ok_or("cannot read hash chain count")? as usize; .ok_or("cannot read hash chain count")? as usize;
hash_off = val + 8; hash_off = val + 8;
hash_sz = nbucket + nchain; hash_sz = (nbucket + nchain) * mem::size_of::<Elf32_Word>();
} }
_ => () _ => ()
} }
} }
// These are the same--there are as many chains as buckets, and the chains only contain
// the symbols that overflowed the bucket.
let symtab_sz = nchain * mem::size_of::<Elf32_Sym>();
if strtab_off + strtab_sz > self.data.len() { if strtab_off + strtab_sz > self.data.len() {
return Err("invalid strtab offset/size")? return Err("invalid strtab offset/size")?
} }
@ -143,10 +147,6 @@ impl Image {
return Err("invalid pltrel offset/size")? return Err("invalid pltrel offset/size")?
} }
// These are the same--there are as many chains as buckets, and the chains only contain
// the symbols that overflowed the bucket.
symtab_sz = nchain;
Ok(DynamicSection { Ok(DynamicSection {
strtab: strtab_off..strtab_off + strtab_sz, strtab: strtab_off..strtab_off + strtab_sz,
symtab: symtab_off..symtab_off + symtab_sz, symtab: symtab_off..symtab_off + symtab_sz,