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btf_encoder: Ignore zero-sized ELF symbols 

It's legal for ELF symbol to have size 0, if it's size is unknown or
unspecified. Instead of erroring out, just ignore such symbols, as they can't
be a valid per-CPU variable anyways.

Reported-by: Érico Rolim <erico.erc@gmail.com>
Reported-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Tested-by: Jiri Slaby <jirislaby@kernel.org>
Bugzilla: https://bugzilla.suse.com/show_bug.cgi?id=1177921
Cc: bpf@vger.kernel.org
Cc: dwarves@vger.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Andrii Nakryiko 2020-10-21 08:52:20 -07:00 committed by Arnaldo Carvalho de Melo
parent 040fd7f585
commit 8cac1c54c8
1 changed files with 4 additions and 8 deletions
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12
btf_encoder.c
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@ -287,6 +287,10 @@ static int find_all_percpu_vars(struct btf_elf *btfe)
if (!addr)
continue;
size = elf_sym__size(&sym);
if (!size)
continue; /* ignore zero-sized symbols */
sym_name = elf_sym__name(&sym, btfe->symtab);
if (!btf_name_valid(sym_name)) {
dump_invalid_symbol("Found symbol of invalid name when encoding btf",
@ -295,14 +299,6 @@ static int find_all_percpu_vars(struct btf_elf *btfe)
continue;
return -1;
}
size = elf_sym__size(&sym);
if (!size) {
dump_invalid_symbol("Found symbol of zero size when encoding btf",
sym_name, btf_elf__verbose, btf_elf__force);
if (btf_elf__force)
continue;
return -1;
}
if (btf_elf__verbose)
printf("Found per-CPU symbol '%s' at address 0x%lx\n", sym_name, addr);