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Rui Ueyama 2021-04-12 14:53:16 +09:00
parent 0e9da59353
commit d786c8a051
1 changed files with 15 additions and 1 deletions
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16
output_chunks.cc
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@ -60,12 +60,26 @@ static i64 to_phdr_flags(OutputChunk<E> *chunk) {
return ret;
}
// PT_GNU_RELRO segment is a security mechanism to make more pages
// read-only than we could have done without it.
//
// Traditionally, sections are either read-only or read-write. If a
// section contains dynamic relocations, it must have been put into a
// read-write segment so that the program loader can mutate its
// contents in memory, even if no one will write to it at runtime.
//
// RELRO segment allows us to make such pages writable only when a
// program is being loaded. After that, the page becomes read-only.
//
// Some sections, such as .init, .fini, .got, .dynamic, contain
// dynamic relocations but doesn't have to be writable at runtime,
// so they are put into a RELRO segment.
template <typename E>
bool is_relro(Context<E> &ctx, OutputChunk<E> *chunk) {
u64 flags = chunk->shdr.sh_flags;
u64 type = chunk->shdr.sh_type;
if ((flags & SHF_WRITE))
if (flags & SHF_WRITE)
if ((flags & SHF_TLS) || type == SHT_INIT_ARRAY ||
type == SHT_FINI_ARRAY || type == SHT_PREINIT_ARRAY ||
chunk == ctx.got.get() || chunk == ctx.dynamic.get() ||