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 <dan...@iogearbox.net> --- tc/tc_bpf.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tc/tc_bpf.c b/tc/tc_bpf.c index 219ffa5..3c97cdb 100644 --- a/tc/tc_bpf.c +++ b/tc/tc_bpf.c @@ -1336,6 +1336,12 @@ 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)) -- 1.9.3
