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author | Lorenz Bauer <oss@lmb.io> | 2022-09-10 11:01:20 +0000 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-10-26 13:19:25 +0200 |
commit | c14ff132725a5cdafb92774e0cf3c4d537cf255c (patch) | |
tree | 6126541419c892f3bf5c970d9105ce7c74e68ee0 /kernel | |
parent | e0a143b329cd9fbd06c7673cfe7505038c1ef47e (diff) | |
download | linux-stable-c14ff132725a5cdafb92774e0cf3c4d537cf255c.tar.gz linux-stable-c14ff132725a5cdafb92774e0cf3c4d537cf255c.tar.bz2 linux-stable-c14ff132725a5cdafb92774e0cf3c4d537cf255c.zip |
bpf: btf: fix truncated last_member_type_id in btf_struct_resolve
[ Upstream commit a37a32583e282d8d815e22add29bc1e91e19951a ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel')
-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 471cc5c117a5..62e05b6283c0 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -1660,7 +1660,7 @@ 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; |