From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from www62.your-server.de (www62.your-server.de [213.133.104.62]) (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 676592236EE; Mon, 10 Aug 2026 09:03:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.133.104.62 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786352610; cv=none; b=DPqgnjifrFKuP9cEOH3n73RMsLIPy1lN7JEPDliKpkFEoxbCXlixbTgDFbxeflAbPNEw9CQJKtTdcLwy6kEarJksXk22yOu3uREAl2A+PjKJ87zRbQ0x2bVsEJciX6pOz08E2Bl7CHuJRmHHXrbhj4aPVKEEQlOQz8oZDb1wdCE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786352610; c=relaxed/simple; bh=2RcTcItp7WWqou36LPBqb29IjWcZ+9YoVFyjkdN2d/4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=WRUhtD6eC/RbUcfiA/zRwgiZyLIm7+M11Byo/6Df/CQnPcSsmJWW+fpx/37GN6kj9OjtWsEJSQP8p048Cn0Z77fE1/wn3yFi44rOMPKydzPoUFCLsgeM0n7I1mYsDscs9gX+n+8fd7iI8oYTkwYiFfTcF5uhtQLf9iS3CFoRlZ4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=iogearbox.net; spf=pass smtp.mailfrom=iogearbox.net; dkim=pass (2048-bit key) header.d=iogearbox.net header.i=@iogearbox.net header.b=BMHCsflk; arc=none smtp.client-ip=213.133.104.62 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=iogearbox.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iogearbox.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=iogearbox.net header.i=@iogearbox.net header.b="BMHCsflk" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=iogearbox.net; s=default2302; h=Content-Transfer-Encoding:Content-Type: In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date:Message-ID:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID; bh=m0+2s40EDB6UcWo9cNFQJhbb3YqJmwPUCVqo5ht8xIY=; b=BMHCsflkjcoVfmOY4N1xSBDH0L AKVglVVkU7E2pIcAitISrMOQRlEsNwU778x6Xcrn7LVsfdORhWQGQByPbbC+xXkY6IJiA4GX2Cgv3 2/IQEisxrccJVMdfTt/zqC40ZT6Ab5s7u4GEGSxMcoezbByrdDhfLV8+Ww6kq1jl5GcwF59zMBgx+ pj4f5b1yF2imTDlFuSmPe0CdpdA44RvL3uvmdd9uTa0S20xd/3pAmRiVZdaGSApjgM9pC4RsfdaRu 9hT9tOZhqtzAxLEj3YN+J78P/YrXqVS49AIyLdkuAEsmO+yw7KmIT2VCt0lNKDxBrv8PVy348xehl B+yPYUVg==; Received: from sslproxy06.your-server.de ([78.46.172.3]) by www62.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96.2) (envelope-from ) id 1wtLul-0000Tr-0k; Mon, 10 Aug 2026 11:03:23 +0200 Received: from localhost ([127.0.0.1]) by sslproxy06.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1wtLuj-0002et-1x; Mon, 10 Aug 2026 11:03:21 +0200 Message-ID: <38568196-4dd0-481b-99b7-153e2209b1ca@iogearbox.net> Date: Mon, 10 Aug 2026 11:03:21 +0200 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net] net/sched: cls_bpf: reject dev-bound programs bound to a different device To: Jamal Hadi Salim , netdev@vger.kernel.org Cc: stable@vger.kernel.org, vega@nebusec.ai, Victor Nogueira , Jakub Kicinski , Quentin Monnet , Simon Horman , Alexei Starovoitov , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Martin KaFai Lau , John Fastabend , Stanislav Fomichev , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , Jiri Pirko , "David S . Miller" , Eric Dumazet , Paolo Abeni , bpf@vger.kernel.org References: <20260809094418.901607-1-jhs@mojatatu.com> Content-Language: en-US From: Daniel Borkmann Autocrypt: addr=daniel@iogearbox.net; keydata= xsFNBGNAkI0BEADiPFmKwpD3+vG5nsOznvJgrxUPJhFE46hARXWYbCxLxpbf2nehmtgnYpAN 2HY+OJmdspBntWzGX8lnXF6eFUYLOoQpugoJHbehn9c0Dcictj8tc28MGMzxh4aK02H99KA8 VaRBIDhmR7NJxLWAg9PgneTFzl2lRnycv8vSzj35L+W6XT7wDKoV4KtMr3Szu3g68OBbp1TV HbJH8qe2rl2QKOkysTFRXgpu/haWGs1BPpzKH/ua59+lVQt3ZupePpmzBEkevJK3iwR95TYF 06Ltpw9ArW/g3KF0kFUQkGXYXe/icyzHrH1Yxqar/hsJhYImqoGRSKs1VLA5WkRI6KebfpJ+ RK7Jxrt02AxZkivjAdIifFvarPPu0ydxxDAmgCq5mYJ5I/+BY0DdCAaZezKQvKw+RUEvXmbL 94IfAwTFA1RAAuZw3Rz5SNVz7p4FzD54G4pWr3mUv7l6dV7W5DnnuohG1x6qCp+/3O619R26 1a7Zh2HlrcNZfUmUUcpaRPP7sPkBBLhJfqjUzc2oHRNpK/1mQ/+mD9CjVFNz9OAGD0xFzNUo yOFu/N8EQfYD9lwntxM0dl+QPjYsH81H6zw6ofq+jVKcEMI/JAgFMU0EnxrtQKH7WXxhO4hx 3DFM7Ui90hbExlFrXELyl/ahlll8gfrXY2cevtQsoJDvQLbv7QARAQABzSZEYW5pZWwgQm9y a21hbm4gPGRhbmllbEBpb2dlYXJib3gubmV0PsLBkQQTAQoAOxYhBCrUdtCTcZyapV2h+93z cY/jfzlXBQJjQJCNAhsDBQkHhM4ACAsJCAcNDAsKBRUKCQgLAh4BAheAAAoJEN3zcY/jfzlX dkUQAIFayRgjML1jnwKs7kvfbRxf11VI57EAG8a0IvxDlNKDcz74mH66HMyhMhPqCPBqphB5 ZUjN4N5I7iMYB/oWUeohbuudH4+v6ebzzmgx/EO+jWksP3gBPmBeeaPv7xOvN/pPDSe/0Ywp dHpl3Np2dS6uVOMnyIsvmUGyclqWpJgPoVaXrVGgyuer5RpE/a3HJWlCBvFUnk19pwDMMZ8t 0fk9O47HmGh9Ts3O8pGibfdREcPYeGGqRKRbaXvcRO1g5n5x8cmTm0sQYr2xhB01RJqWrgcj ve1TxcBG/eVMmBJefgCCkSs1suriihfjjLmJDCp9XI/FpXGiVoDS54TTQiKQinqtzP0jv+TH 1Ku+6x7EjLoLH24ISGyHRmtXJrR/1Ou22t0qhCbtcT1gKmDbTj5TcqbnNMGWhRRTxgOCYvG0 0P2U6+wNj3HFZ7DePRNQ08bM38t8MUpQw4Z2SkM+jdqrPC4f/5S8JzodCu4x80YHfcYSt+Jj ipu1Ve5/ftGlrSECvy80ZTKinwxj6lC3tei1bkI8RgWZClRnr06pirlvimJ4R0IghnvifGQb M1HwVbht8oyUEkOtUR0i0DMjk3M2NoZ0A3tTWAlAH8Y3y2H8yzRrKOsIuiyKye9pWZQbCDu4 ZDKELR2+8LUh+ja1RVLMvtFxfh07w9Ha46LmRhpCzsFNBGNAkI0BEADJh65bNBGNPLM7cFVS nYG8tqT+hIxtR4Z8HQEGseAbqNDjCpKA8wsxQIp0dpaLyvrx4TAb/vWIlLCxNu8Wv4W1JOST wI+PIUCbO/UFxRy3hTNlb3zzmeKpd0detH49bP/Ag6F7iHTwQQRwEOECKKaOH52tiJeNvvyJ pPKSKRhmUuFKMhyRVK57ryUDgowlG/SPgxK9/Jto1SHS1VfQYKhzMn4pWFu0ILEQ5x8a0RoX k9p9XkwmXRYcENhC1P3nW4q1xHHlCkiqvrjmWSbSVFYRHHkbeUbh6GYuCuhqLe6SEJtqJW2l EVhf5AOp7eguba23h82M8PC4cYFl5moLAaNcPHsdBaQZznZ6NndTtmUENPiQc2EHjHrrZI5l kRx9hvDcV3Xnk7ie0eAZDmDEbMLvI13AvjqoabONZxra5YcPqxV2Biv0OYp+OiqavBwmk48Z P63kTxLddd7qSWbAArBoOd0wxZGZ6mV8Ci/ob8tV4rLSR/UOUi+9QnkxnJor14OfYkJKxot5 hWdJ3MYXjmcHjImBWplOyRiB81JbVf567MQlanforHd1r0ITzMHYONmRghrQvzlaMQrs0V0H 5/sIufaiDh7rLeZSimeVyoFvwvQPx5sXhjViaHa+zHZExP9jhS/WWfFE881fNK9qqV8pi+li 2uov8g5yD6hh+EPH6wARAQABwsF8BBgBCgAmFiEEKtR20JNxnJqlXaH73fNxj+N/OVcFAmNA kI0CGwwFCQeEzgAACgkQ3fNxj+N/OVfFMhAA2zXBUzMLWgTm6iHKAPfz3xEmjtwCF2Qv/TT3 KqNUfU3/0VN2HjMABNZR+q3apm+jq76y0iWroTun8Lxo7g89/VDPLSCT0Nb7+VSuVR/nXfk8 R+OoXQgXFRimYMqtP+LmyYM5V0VsuSsJTSnLbJTyCJVu8lvk3T9B0BywVmSFddumv3/pLZGn 17EoKEWg4lraXjPXnV/zaaLdV5c3Olmnj8vh+14HnU5Cnw/dLS8/e8DHozkhcEftOf+puCIl Awo8txxtLq3H7KtA0c9kbSDpS+z/oT2S+WtRfucI+WN9XhvKmHkDV6+zNSH1FrZbP9FbLtoE T8qBdyk//d0GrGnOrPA3Yyka8epd/bXA0js9EuNknyNsHwaFrW4jpGAaIl62iYgb0jCtmoK/ rCsv2dqS6Hi8w0s23IGjz51cdhdHzkFwuc8/WxI1ewacNNtfGnorXMh6N0g7E/r21pPeMDFs rUD9YI1Je/WifL/HbIubHCCdK8/N7rblgUrZJMG3W+7vAvZsOh/6VTZeP4wCe7Gs/cJhE2gI DmGcR+7rQvbFQC4zQxEjo8fNaTwjpzLM9NIp4vG9SDIqAm20MXzLBAeVkofixCsosUWUODxP owLbpg7pFRJGL9YyEHpS7MGPb3jSLzucMAFXgoI8rVqoq6si2sxr2l0VsNH5o3NgoAgJNIg= In-Reply-To: <20260809094418.901607-1-jhs@mojatatu.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Clear (ClamAV 1.4.3/28088/Mon Aug 10 08:24:15 2026) On 8/9/26 11:44 AM, Jamal Hadi Salim wrote: > cls_bpf_prog_from_efd() obtained a SCHED_CLS program via > bpf_prog_get_type_dev() but never verified that a device-bound (offloaded) > program's bound netdev matches the TC netdev the classifier is being > attached to. This let a program loaded with prog_ifindex for device A be > attached via cls_bpf + skip_sw to device B; deleting device A then > destroyed the program's offload state while it was still attached to > device B, triggering a netdevsim WARN (panic with panic_on_warn=1). > > Mirror the XDP attach path (net/core/dev.c) and reject the attach with > -EINVAL when a dev-bound program's bound device does not match the > target device. > > Fixes: 6c8dfe21c435 ("cls_bpf: allow attaching programs loaded for specific device") > Reported-by: vega@nebusec.ai > Tested-by: Victor Nogueira > Signed-off-by: Jamal Hadi Salim Acked-by: Daniel Borkmann