diff options
| author | Lorenz Bauer <oss@lmb.io> | 2022-09-10 11:01:20 +0000 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-09-10 18:08:38 -0700 |
| commit | a37a32583e282d8d815e22add29bc1e91e19951a (patch) | |
| tree | ba0074b977458bb783dee669335420ad53bc3779 /kernel/bpf | |
| parent | 8a7d61bdc2fac2c460a2f32a062f5c6dbd21a764 (diff) | |
| download | linux-a37a32583e282d8d815e22add29bc1e91e19951a.tar.bz2 | |
bpf: btf: fix truncated last_member_type_id in btf_struct_resolve
When trying to finish resolving a struct member, btf_struct_resolve
saves the member type id in a u16 temporary variable. This truncates
the 32 bit type id value if it exceeds UINT16_MAX.
As a result, structs that have members with type ids > UINT16_MAX and
which need resolution will fail with a message like this:
[67414] STRUCT ff_device size=120 vlen=12
effect_owners type_id=67434 bits_offset=960 Member exceeds struct_size
Fix this by changing the type of last_member_type_id to u32.
Fixes: a0791f0df7d2 ("bpf: fix BTF limits")
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Lorenz Bauer <oss@lmb.io>
Link: https://lore.kernel.org/r/20220910110120.339242-1-oss@lmb.io
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/bpf')
| -rw-r--r-- | kernel/bpf/btf.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 7e64447659f3..36fd4b509294 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -3128,7 +3128,7 @@ static int btf_struct_resolve(struct btf_verifier_env *env, if (v->next_member) { const struct btf_type *last_member_type; const struct btf_member *last_member; - u16 last_member_type_id; + u32 last_member_type_id; last_member = btf_type_member(v->t) + v->next_member - 1; last_member_type_id = last_member->type; |