From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4ADA0270551 for ; Sun, 2 Nov 2025 11:37:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762083471; cv=none; b=Xg7sIHx574PSZns0G8K+ZIaPKvgDqhHWGAhnrSbGYPiMQXzAAB0p3ydQ/BZTOIKdI8w5+uLo5mj0NSbFni+BpLLO3SpNWlL3S4d2eyoPo9ZDeq6VAgJ4jf8d5yyMej8VAjKUIQK3R0plLekEdMaItuBpT4TRiE4fB6Mqa+TXV5k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762083471; c=relaxed/simple; bh=bTxFJO9yoVX7Uq03Ks7P+vpbNJ7Mnn7qkT+vSkfPxpo=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=r622L1OPQ6LbQPpvzgGrwjBZjAjl+hI19nRMMLUE5WcxKn5grNcF1ZMviIoimxGIShtpLgffb/cp8o+9kvq4TRrUY43p79lZ9SHIDfs1Iq/DM3usaDYnu0YPLXp9wonoNXWMWTsWAaS/0P1zmGJjtiKCQL1AJp7VEAOVZU07AGg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=KN7z943z; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="KN7z943z" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 98258C4CEF7; Sun, 2 Nov 2025 11:37:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1762083470; bh=bTxFJO9yoVX7Uq03Ks7P+vpbNJ7Mnn7qkT+vSkfPxpo=; h=From:To:Cc:Subject:Date:From; b=KN7z943z9tRf+fI8f3+1mF0n8imgg0cy/Rcjd0CgtFu+f+UR4i5rcZvQcAOrwN9V6 QGTp3/ujH7fyq81/ruJOly3laFGmKmF+Ub9k1KZlyByOUCgsinviHe7quz8aeeVC1A iB1O16hL+XzvvcsZNHyMW0ycV9ZIdCPXOqoF1M9i9WuLLVgYKoutl1WpUuttwvbr/N pnVc8N2XmRCnJmoTNdDQmMV6F8vLHfs/mtuiPUaec6PjuTZ9/kCS/dJ0AoBpdwwAA7 x6orZ1oYLXTFqs0XF5AiMIEopkcuRp12rjh3fwGppxGBUVgQcgVgqt99KGg+m0+LKx ZpGcP8PAQMa6w== From: KP Singh To: bpf@vger.kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, clm@meta.com, KP Singh Subject: [PATCH bpf] bpf: Check size of the signature buffer Date: Sun, 2 Nov 2025 12:37:42 +0100 Message-ID: <20251102113742.34908-1-kpsingh@kernel.org> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Accept only a SHA256 sized buffer. Fixes: 349271568303 ("bpf: Implement signature verification for BPF programs") Reported-by: Chris Mason Signed-off-by: KP Singh --- kernel/bpf/syscall.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 8a129746bd6c..cc5bce20ec86 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -2826,6 +2826,9 @@ static int bpf_prog_verify_signature(struct bpf_prog *prog, union bpf_attr *attr void *sig; int err = 0; + if (attr->signature_size != SHA256_DIGEST_SIZE) + return -EINVAL; + if (system_keyring_id_check(attr->keyring_id) == 0) key = bpf_lookup_system_key(attr->keyring_id); else -- 2.43.0