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tc, bpf: make sure relo is in relation with map section 

Add a test that symbol from relocation entry is actually related
to map section and bail out with an error message if it's not the
case; in relation to [1].

  [1] https://llvm.org/bugs/show_bug.cgi?id=26243

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Borkmann 2016-01-22 00:46:28 +01:00 committed by Stephen Hemminger
parent 4a36b4c2ec
commit 2486337aac
1 changed files with 6 additions and 0 deletions
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6
tc/tc_bpf.c
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@ -1328,6 +1328,12 @@ static int bpf_apply_relo_data(struct bpf_elf_ctx *ctx,
if (gelf_getsym(ctx->sym_tab, GELF_R_SYM(relo.r_info), &sym) != &sym)
return -EIO;
if (sym.st_shndx != ctx->sec_maps) {
fprintf(stderr, "ELF contains non-map related relo data in "
"entry %u pointing to section %u! Compiler bug?!\n",
relo_ent, sym.st_shndx);
return -EIO;
}
rmap = sym.st_value / sizeof(struct bpf_elf_map);
if (rmap >= ARRAY_SIZE(ctx->map_fds))