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bpf/btf: Fix BTF verification of enum members in struct/union 

btf_enum_check_member() was currently sure to recognize the size of
"enum" type members in struct/union as the size of "int" even if
its size was packed.

This patch fixes BTF enum verification to use the correct size
of member in BPF programs.

Fixes: 179cde8cef ("bpf: btf: Check members of struct/union")
Signed-off-by: Yoshiki Komachi <komachi.yoshiki@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/1583825550-18606-2-git-send-email-komachi.yoshiki@gmail.com
This commit is contained in:
Yoshiki Komachi 2020-03-10 16:32:29 +09:00 committed by Alexei Starovoitov
parent 1d8006abaa
commit da6c7faeb1
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/btf.c
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@ -2418,7 +2418,7 @@ static int btf_enum_check_member(struct btf_verifier_env *env,
struct_size = struct_type->size;
bytes_offset = BITS_ROUNDDOWN_BYTES(struct_bits_off);
if (struct_size - bytes_offset < sizeof(int)) {
if (struct_size - bytes_offset < member_type->size) {
btf_verifier_log_member(env, struct_type, member,
"Member exceeds struct_size");
return -EINVAL;