From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f172.google.com (mail-pl1-f172.google.com [209.85.214.172]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 541B43A1686 for ; Fri, 16 Oct 2026 23:52:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792194724; cv=none; b=TGIfUCEf5Y7KkRs6pNxwpQ5h3okRhTeIpJPBJNUkMJa6ykfkAQ/93W9mBRrK7znQ5uRSfkgNMPwhCSsy+bzQqsKNitUDFLuq3U0QSGMaH5EDUPJKHcZo7Y9xgAQZ6LX9z9xqYYjFUMfCKibhHOJ4y9iKe53fDhMJrp8XJ7lSZD8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792194724; c=relaxed/simple; bh=encltDdbwP86iA3t/RWo0uh5+73YF5lHb4R7QxtVGSc=; h=Content-Type:Date:Message-Id:Cc:Subject:From:To:In-Reply-To: References:MIME-Version; b=MKDxOfMRLQK5vGE3/oTeNFyIb0vTIdMl9UJ4lKOSDzllZmwZ9oD/rd9MElcgzKjZy6kHtwHOHit6Ptobgv7Q4FuVgNlPjUYy2fZQaziD8bk9oSdwwr1+OPvph16uXAGLlJVkeYKOKrFb78OGLt4ZTctzcXbH0HgjI81jf6dTQ5I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=i5/ESChz; arc=none smtp.client-ip=209.85.214.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="i5/ESChz" Received: by mail-pl1-f172.google.com with SMTP id d9443c01a7336-2e934449bb0so2988105ad.0 for ; Fri, 16 Oct 2026 16:52:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1792194723; x=1792799523; darn=vger.kernel.org; h=mime-version:content-transfer-encoding:references:in-reply-to:to :from:subject:cc:message-id:date:content-type:from:to:cc:subject :date:message-id:reply-to:content-type; bh=LEuEMUsoi9gqHznlDv6aFR0STWW3QPHsNbZxVfkH0AU=; b=i5/ESChzehoZqOnDmo5QAe0grXmsnQAgamVuu3FZMvSX7rkfz233i3eXVjUafU0CUg 5R2J5BXI3uZVWVhZjAyiK/Y47KmBv86SieFhGQROGXAP1/PZRPkBQ0hRYmZiR3DAVgdH SX5yslwd4sIN4Teo+rON6BhgNnGWVDTfMEAP8z5a4OC769lzWBFaEj4iu+DwUwmzouWf N5Cn+AdjCYlNdjltdOzblD1LBONRTNvbrJ4e+bBplr7haKc8YJsCVPS6Y6VE8qvZ47Ss ifHHFHhFZXuWxfieLzAMV6u8PdlqiR1PcuWM77jX4TJyUBY1glqZJA6RWU+TUsJMYclZ 73Sg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1792194723; x=1792799523; h=mime-version:content-transfer-encoding:references:in-reply-to:to :from:subject:cc:message-id:date:content-type:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=LEuEMUsoi9gqHznlDv6aFR0STWW3QPHsNbZxVfkH0AU=; b=1RXbcWJdM0gc5kbjOgooa4G2ciBN/1qWPi3CspZPXHAzcV0W6XVsnoO+ePMKWXYrOr hJgpZUd5Bp8dMJNVXYCabiBrVdZG3N0dln3Ld9CgNgDZFgXnRTkk8ZK+EUDfubd/9Jj2 MHB9z8qXxPuDGzJgiNnwIEguXM7T1YuPqLdqRSE5SfAh/IhrzPqn5RCFNWdDCHDZuKr4 o/IDC1neXkJi7BcMJzk1sFZbaICXHU05NVdzHWpoH9M3Ec+xVsO/YS+VJtHvuANUtY4w /Bs81GkQxZ58Qaad2RQAOfY77RmcncdQiPg7XssXmhxAhkCkURRFooAr4be6raWwm9pS a+Jw== X-Forwarded-Encrypted: i=1; AKwUvBzvtFJmVoZ1l2VAyzvxu2IGvsb9yBrIDPzvfA393ksrG54rvHvBK8JB3lsvyDtQmKMm5jrzXUzCzTMrN5U=@vger.kernel.org X-Gm-Message-State: AFq9FYKvufLVXrWea9T1pLW8iNQOarrzmfwEthY/hylhRwhE20dIQEyA b4JXGVZibJ/qAUg1RSNFqF6aAeJcKrHSv4RWY/TPMV6/v12WyvP1OoK9 X-Gm-Gg: AYBFou239vFaajmI0bCes+KGOyAtB+HoK6d8DzY32kpN6tKrVgGWB/yvCaPxpxTqEHP abR+4sJ5ockgH1+L5eyim8rCVM2pseTOdW/6RNrgezjWCI1fYW//odErKFAelsfipHELpusbMbw eXspsydCw8P4dJg0uac99/33WLKVPhXWfrw/X93APH8P/0c/gZiA1OkGm1ho5v7e8qFJTSDs/TF u+EUlE3n/nauI7KyYjdFpf13Gsy40o9B4NbGlb/ZhvoomYrpspu507VLmzsbSh8JhBejdqd3LFG aNSvSH9RIqsImbMHRwcZh+GEaoc+03l+VrTurZIvRFXYux/qVl18foA7+vUsqrfikx437oUGG6t UIXt754hnHVWN9CUpagekwGSNVKD0XqLDDOC1c1tUwDI6tXKLJQQY2RiQRSoBB6kc49mJC4xYeI 5aqTz7kJgImexCifgYA+B1GqdIhzQGD8RGKuTPN2UWvnGqlH99obARgD910lUwCxOYDJ2xwWs5Q lM70MX8FNazejVa6GhW2Rj/z7iGHetI+X7ujs9h094a+CmMogIZ3cbcmpe4EBQ/49bLaIzeHXau T9mKlIKZZ3OBsg== X-Received: by 2002:a17:903:370b:b0:2e9:55fc:ded2 with SMTP id d9443c01a7336-2e9a6d1f605mr14152635ad.52.1792194722571; Fri, 16 Oct 2026 16:52:02 -0700 (PDT) Received: from localhost ([153.61.198.253]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2e97e833ffdsm16714415ad.32.2026.10.16.16.52.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 16 Oct 2026 16:52:02 -0700 (PDT) Content-Type: text/plain; charset=UTF-8 Date: Fri, 16 Oct 2026 23:52:01 +0000 Message-Id: Cc: , , , "Sashiko" , "Jakub Sitnicki" Subject: Re: [PATCH bpf-next 2/3] bpf, sockmap: Restrict iter-context sockmap updates to iter/sockmap From: "Alexei Starovoitov" To: "Michal Luczaj" , "Daniel Borkmann" , "Andrii Nakryiko" , "Eduard Zingerman" , "Kumar Kartikeya Dwivedi" , "Martin KaFai Lau" , "Song Liu" , "Yonghong Song" , "Jiri Olsa" , "Emil Tsalapatis" , "Ihor Solodrai" , "Shuah Khan" , "John Fastabend" , "Lorenz Bauer" In-Reply-To: <20261016-sockmap-update-limit-iter-v1-2-23fa946db59e@rbox.co> References: <20261016-sockmap-update-limit-iter-v1-0-23fa946db59e@rbox.co> <20261016-sockmap-update-limit-iter-v1-2-23fa946db59e@rbox.co> X-Mailer: mkdraft (claude review draft; edit before sending) Content-Transfer-Encoding: 8bit Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Fri, Oct 16, 2026 at 11:09 PM Michal Luczaj wrote: > [2]: commit 64c2f93fc325 ("bpf, sockmap: Take state lock for af_unix iter") unix_state_lock() in bpf_iter_unix_seq_show() was added only for unix_stream_bpf_update_proto() called from the iter prog. iter/unix cannot get there anymore. can we drop it ? can be a follow up... > + if (eatype == BPF_TRACE_ITER && > + env->prog->type == BPF_PROG_TYPE_TRACING && > + !strcmp(afname + strlen(BPF_ITER_FUNC_PREFIX), "sockmap")) > return true; iter/sockmap prog is not limited to ctx->sk it seems. bpf_skc_to_unix_sock(ctx->sk)->peer is a plain PTR_TO_BTF_ID and the value arg of bpf_map_update_elem() accepts it. The peer doesn't have to be in any map, so it has no psock, and sock_map_seq_show() holds nothing but rcu. sock_map_update_elem() takes bh_lock_sock(), then sock_map_link() does sk_psock_init() and unix_stream_bpf_update_proto() on a socket that unix_release_sock() can be tearing down. That's the same unlocked socket as in iter/task_file. Should we restrict it to ctx->sk somehow? pw-bot: cr