From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 1366C252910 for ; Wed, 19 Mar 2025 09:21:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742376088; cv=none; b=LOtOBGjIrNqcAc/dKDa0oF67SW5uBcbRrV5eDr1tY+wvfWLonrVQyKT3ePPD+8MN/iCoDCBXN0Bq7ak8nd9K630e1FNiVuvgMs7DqkbY+WhGr/0QZY0wEOi1RR7Z5+gI8D3G9fzldbnHsbgeuzJnQgbYFfZHt3MehqoutCh82/I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742376088; c=relaxed/simple; bh=hayqKUFA/zQJSjM3dzvjLdtKtJ8WDFXlSPyW2SDZhz4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=oT6kZh2m9qj4C5gFOsrHRcf1xNNzxirjunraC7iIb/GLKFrTi0Chz+OoybAl/3mMnEgZlVswJC8I06pe902hLenv05LPnZvSAqjnXEjEYuytTeoBEkeR/yjJD9ZF+NkmIkyP5vlAdLikVmwHXgPNEQMkANpd4Wn+2t08D+AiIhw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=ZFaZWvAL; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="ZFaZWvAL" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1742376086; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=SBldNCvr3M04fJOmB6HQlMjvE8qJv/8GrRmjEF3wfqc=; b=ZFaZWvALGZAqvCJ9cUKK+jQsa0KX6D/poQ+lTLyGJQt81RvaZ03hSzkc0B3J4/9o/I5UGX 7xuLm3f7MZHZnv0qy4AN7n+c5dgWTyZtMDzjqdrEOi8at3SzBaxv5cvfH/wnvA69qPdlO9 6KiLb4YLYZZAie2fegUMobC+61mTCbk= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-581-cSV0OKTbOWyX1fw6JdeUww-1; Wed, 19 Mar 2025 05:21:22 -0400 X-MC-Unique: cSV0OKTbOWyX1fw6JdeUww-1 X-Mimecast-MFC-AGG-ID: cSV0OKTbOWyX1fw6JdeUww_1742376082 Received: by mail-wm1-f71.google.com with SMTP id 5b1f17b1804b1-438e180821aso19105175e9.1 for ; Wed, 19 Mar 2025 02:21:22 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1742376082; x=1742980882; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=SBldNCvr3M04fJOmB6HQlMjvE8qJv/8GrRmjEF3wfqc=; b=Rvnauz5ZLAka9tsEI6u04TT27pxqhpfS3JglNJhZ/XKsWRmfJvS264epl1+yJy1C6v QCRAsunAQeA1XR+tRmG+3S7AqnPjEG8NAN3Cz123ChEKXFT12+568EZMFB7UDh/kYDZn 1q7SuQMC6dFdVTaYRkA2isa3b2H5UmeQ+LyD+pRdQuhsvoi/wTrx29uzzT654hekYTnF w+TF0RLKp4MjBHUk6ovufkRYKCczB6Rqr/OJREO+4AqPixneOgpzIC71CzH+1ZywRbqp PmgYJ5QMRVCdqs/U68edfq+KIA608ZU5OBStqbL3i0JWitT12rT8Y+/9qhh2veEhov1n YbBw== X-Forwarded-Encrypted: i=1; AJvYcCUR6xvURvIkOgz+BnRUWbgn2GV3ayatf+VcqinMUjph8OY9YG2NcKqX3iLJQoHIO8uuWxOtDwM=@vger.kernel.org X-Gm-Message-State: AOJu0YxFj3t08dmengOhLFQa/z4sEgKD0KYYtYzI7zvtFOyORMsoiHCo xcfMYF65wJVwF7LEM8+L1LRt3f7rryVexbcZD/J5jBDd5u8o2NZj5L1QgK4e2eSuMIIQD8Q86kg XrTQJvRsj28ZuN6BYnbPJ2aflDvZo88d4N25zBfbNPFX9TekmSewFbw== X-Gm-Gg: ASbGncuV0vYQh50UOuxgOvUeYV08xAgb2D7iwW2A+UUDmQDm7BhPV5SYz+qsZwKedHF SELQc3iC7v1thMH+6uTnB96C2osof6mCd8BZs69PBtCvi3eR2xJmgZQnybJ8DzouIU9tV12QroK OzWeBgaTkP2llN/FDRLN3y6S7EL5nbCAhBRUSlQkWlTDK+yXLubwQQ6W07u5uRk4DhtK9E6HhHr MLDvxeMwXDyOF6Hu9pqH42guBNyyaPNwJzcbtW9GrO/rq+mR/o4gG3q89YmfGydbDVE5gT2hV1y pLPB6ss2IA== X-Received: by 2002:a05:600c:4fc8:b0:43a:b8eb:9e5f with SMTP id 5b1f17b1804b1-43d43781d7dmr15053285e9.3.1742376081593; Wed, 19 Mar 2025 02:21:21 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGFTbAy+ec2vOHg58y5rxcFbvt1zKhjrhAbtgCtsF91K96gkFV7iO8cXVF5jgAUnN+dJQoKFQ== X-Received: by 2002:a05:600c:4fc8:b0:43a:b8eb:9e5f with SMTP id 5b1f17b1804b1-43d43781d7dmr15052755e9.3.1742376081050; Wed, 19 Mar 2025 02:21:21 -0700 (PDT) Received: from redhat.com ([2a0d:6fc0:1517:1000:ea83:8e5f:3302:3575]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43d43f84f9bsm13000475e9.33.2025.03.19.02.21.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Mar 2025 02:21:20 -0700 (PDT) Date: Wed, 19 Mar 2025 05:21:16 -0400 From: "Michael S. Tsirkin" To: Michal Luczaj Cc: Stefano Garzarella , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Bobby Eshleman , Andrii Nakryiko , Eduard Zingerman , Mykola Lysenko , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Shuah Khan , netdev@vger.kernel.org, bpf@vger.kernel.org, virtualization@lists.linux.dev, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH net v4 0/3] vsock/bpf: Handle races between sockmap update and connect() disconnecting Message-ID: <20250319052106-mutt-send-email-mst@kernel.org> References: <20250317-vsock-trans-signal-race-v4-0-fc8837f3f1d4@rbox.co> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250317-vsock-trans-signal-race-v4-0-fc8837f3f1d4@rbox.co> On Mon, Mar 17, 2025 at 10:52:22AM +0100, Michal Luczaj wrote: > Signal delivery during connect() may disconnect an already established > socket. Problem is that such socket might have been placed in a sockmap > before the connection was closed. > > PATCH 1 ensures this race won't lead to an unconnected vsock staying in the > sockmap. PATCH 2 selftests it. > > PATCH 3 fixes a related race. Note that selftest in PATCH 2 does test this > code as well, but winning this race variant may take more than 2 seconds, > so I'm not advertising it. > > Signed-off-by: Michal Luczaj vsock things: Acked-by: Michael S. Tsirkin > --- > Changes in v4: > - Selftest: send signal to only our own process > - Link to v3: https://lore.kernel.org/r/20250316-vsock-trans-signal-race-v3-0-17a6862277c9@rbox.co > > Changes in v3: > - Selftest: drop unnecessary variable initialization and reorder the calls > - Link to v2: https://lore.kernel.org/r/20250314-vsock-trans-signal-race-v2-0-421a41f60f42@rbox.co > > Changes in v2: > - Handle one more path of tripping the warning > - Add a selftest > - Collect R-b [Stefano] > - Link to v1: https://lore.kernel.org/r/20250307-vsock-trans-signal-race-v1-1-3aca3f771fbd@rbox.co > > --- > Michal Luczaj (3): > vsock/bpf: Fix EINTR connect() racing sockmap update > selftest/bpf: Add test for AF_VSOCK connect() racing sockmap update > vsock/bpf: Fix bpf recvmsg() racing transport reassignment > > net/vmw_vsock/af_vsock.c | 10 ++- > net/vmw_vsock/vsock_bpf.c | 24 ++++-- > .../selftests/bpf/prog_tests/sockmap_basic.c | 99 ++++++++++++++++++++++ > 3 files changed, 124 insertions(+), 9 deletions(-) > --- > base-commit: da9e8efe7ee10e8425dc356a9fc593502c8e3933 > change-id: 20250305-vsock-trans-signal-race-d62f7718d099 > > Best regards, > -- > Michal Luczaj