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| author | Xi Ruoyao <xry111@xry111.site> | 2022-09-20 14:09:29 +0800 |
|---|---|---|
| committer | liuzhensong <liuzhensong@loongson.cn> | 2022-09-20 17:16:05 +0800 |
| commit | 6224a6c2ead26a04f0b2b8ccf4ff5b817afbb425 (patch) | |
| tree | 02df20b432fad41fa61a7cc3c7a58b2378d2ec43 | |
| parent | 6519cd1a15fda2b67ae3e4ad8a2758615d3e0f9f (diff) | |
| download | gdb-6224a6c2ead26a04f0b2b8ccf4ff5b817afbb425.zip gdb-6224a6c2ead26a04f0b2b8ccf4ff5b817afbb425.tar.gz gdb-6224a6c2ead26a04f0b2b8ccf4ff5b817afbb425.tar.bz2 | |
LoongArch: Don't write into GOT for local ifunc
Local ifuncs are always resolved at runtime via R_LARCH_IRELATIVE, so
there is no need to write anything into GOT. And when we write the GOT
we actually trigger a heap-buffer-overflow: If a and b are different
sections, we cannot access something in b with "a->contents + (offset
from a)" because "a->contents" and "b->contents" are heap buffers
allocated separately, not slices of a large buffer.
So stop writing into GOT for local ifunc now.
| -rw-r--r-- | bfd/elfnn-loongarch.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/bfd/elfnn-loongarch.c b/bfd/elfnn-loongarch.c index ed42b8b..af18a8a 100644 --- a/bfd/elfnn-loongarch.c +++ b/bfd/elfnn-loongarch.c @@ -3179,6 +3179,8 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, htab->elf.srelgot, &rela); } h->got.offset |= 1; + bfd_put_NN (output_bfd, relocation, + got->contents + got_off); } } else @@ -3200,10 +3202,9 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info, } local_got_offsets[r_symndx] |= 1; } + bfd_put_NN (output_bfd, relocation, got->contents + got_off); } - bfd_put_NN (output_bfd, relocation, got->contents + got_off); - relocation = got_off + sec_addr (got); } |