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[ELF] Create dynamic entries for .relr.dyn

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If the corresponding DT_RELR, DT_RELRSZ and DT_RELRENT dynamic entries
are not present, dynamic linkers won't pick up the relocations encoded
in .relr.dyn.

Signed-off-by: Daniel Bertalan <dani@danielbertalan.dev>
This commit is contained in:
Daniel Bertalan 2022-01-22 17:39:40 +01:00
parent 1ae6c55c52
commit d1151a9528
2 changed files with 9 additions and 0 deletions
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3
elf/elf.h
View File

@ -186,6 +186,9 @@ static constexpr u32 DT_INIT_ARRAYSZ = 27;
static constexpr u32 DT_FINI_ARRAYSZ = 28;
static constexpr u32 DT_RUNPATH = 29;
static constexpr u32 DT_FLAGS = 30;
static constexpr u32 DT_RELRSZ = 35;
static constexpr u32 DT_RELR = 36;
static constexpr u32 DT_RELRENT = 37;
static constexpr u32 DT_GNU_HASH = 0x6ffffef5;
static constexpr u32 DT_VERSYM = 0x6ffffff0;
static constexpr u32 DT_RELACOUNT = 0x6ffffff9;

6
elf/output-chunks.cc
View File

@ -524,6 +524,12 @@ static std::vector<typename E::WordTy> create_dynamic_section(Context<E> &ctx) {
define(E::is_rel ? DT_RELENT : DT_RELAENT, sizeof(ElfRel<E>));
}
if (ctx.relrdyn) {
define(DT_RELR, ctx.relrdyn->shdr.sh_addr);
define(DT_RELRSZ, ctx.relrdyn->shdr.sh_size);
define(DT_RELRENT, ctx.relrdyn->shdr.sh_entsize);
}
if (ctx.relplt->shdr.sh_size) {
define(DT_JMPREL, ctx.relplt->shdr.sh_addr);
define(DT_PLTRELSZ, ctx.relplt->shdr.sh_size);