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a=openpgp; fpr=35CCFB63B283D6D3AEB783944CB5F6848BBC56EE X-Developer-Signature: v=1; a=openpgp-sha256; l=898; i=samitolvanen@google.com; h=from:subject; bh=whKXq2UaWgwSKq4RZq/7tWTQr5a1lYl0L1Z4K3S66gE=; b=owGbwMvMwCUWxa662nLh8irG02pJDJlJvPx6jzfYi5ROYond+/r3wTd7whiz1s1coLJkX221S tIdxp7THaUsDGJcDLJiiiwtX1dv3f3dKfXV5yIJmDmsTCBDGLg4BWAiSoUMf+U+2kytUlgbn771 1e2DYdc9iu3fc2kYTlac99+n55y7HAvD/7wZXnxBn/MWu77TymXu+3dvYU/leh4LdtVV7+0VJ93 M5wIA X-Mailer: git-send-email 2.52.0.457.g6b5491de43-goog Message-ID: <20260110082548.113748-10-samitolvanen@google.com> Subject: [PATCH bpf-next v5 4/4] bpf, btf: Enforce destructor kfunc type with CFI From: Sami Tolvanen To: bpf@vger.kernel.org Cc: Vadim Fedorenko , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Jamal Hadi Salim , Cong Wang , Jiri Pirko , Viktor Malik , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Sami Tolvanen Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Ensure that registered destructor kfuncs have the same type as btf_dtor_kfunc_t to avoid a kernel panic on systems with CONFIG_CFI enabled. Signed-off-by: Sami Tolvanen Acked-by: Yonghong Song --- kernel/bpf/btf.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 539c9fdea41d..2c6076fc29b9 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -8846,6 +8846,13 @@ static int btf_check_dtor_kfuncs(struct btf *btf, co= nst struct btf_id_dtor_kfunc */ if (!t || !btf_type_is_ptr(t)) return -EINVAL; + + if (IS_ENABLED(CONFIG_CFI_CLANG)) { + /* Ensure the destructor kfunc type matches btf_dtor_kfunc_t */ + t =3D btf_type_by_id(btf, t->type); + if (!btf_type_is_void(t)) + return -EINVAL; + } } return 0; } --=20 2.52.0.457.g6b5491de43-goog