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Emit UUIDv4 if --build-id=uuid is specified

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This commit is contained in:
Rui Ueyama 2021-04-28 19:48:37 +09:00
parent b1ca02b276
commit 34462cf473
2 changed files with 20 additions and 4 deletions
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21
output_chunks.cc
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@ -1548,6 +1548,22 @@ static void compute_sha256(Context<E> &ctx, i64 offset) {
munmap(buf, std::min(bufsize, shard_size));
}
template <typename E>
static std::vector<u8> get_uuid_v4(Context<E> &ctx) {
std::vector<u8> buf(16);
if (!RAND_bytes(buf.data(), buf.size()))
Fatal(ctx) << "RAND_bytes failed";
// Indicate that this is UUIDv4.
buf[6] &= 0b00001111;
buf[6] |= 0b01000000;
// Indicates that this is an RFC4122 variant.
buf[8] &= 0b00111111;
buf[8] |= 0b10000000;
return buf;
}
template <typename E>
void BuildIdSection<E>::write_buildid(Context<E> &ctx, i64 filesize) {
switch (ctx.arg.build_id.kind) {
@ -1563,9 +1579,8 @@ void BuildIdSection<E>::write_buildid(Context<E> &ctx, i64 filesize) {
compute_sha256(ctx, this->shdr.sh_offset + HEADER_SIZE);
return;
case BuildId::UUID:
if (!RAND_bytes(ctx.buf + this->shdr.sh_offset + HEADER_SIZE,
ctx.arg.build_id.size(ctx)))
Fatal(ctx) << "RAND_bytes failed";
write_vector(ctx.buf + this->shdr.sh_offset + HEADER_SIZE,
get_uuid_v4(ctx));
return;
}

3
test/build-id.sh
View File

@ -11,7 +11,8 @@ clang -o $t/exe $t/a.c -fuse-ld=`pwd`/../mold -Wl,-build-id
readelf -n $t/exe | grep -qv 'GNU.*0x00000010.*NT_GNU_BUILD_ID'
clang -o $t/exe $t/a.c -fuse-ld=`pwd`/../mold -Wl,-build-id=uuid
readelf -n $t/exe | grep -q 'GNU.*0x00000010.*NT_GNU_BUILD_ID'
readelf -nW $t/exe |
grep -Pq 'GNU.*0x00000010.*NT_GNU_BUILD_ID.*Build ID: ............4...[89abcdef]'
clang -o $t/exe $t/a.c -fuse-ld=`pwd`/../mold -Wl,-build-id=md5
readelf -n $t/exe | grep -q 'GNU.*0x00000010.*NT_GNU_BUILD_ID'