From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f194.google.com (mail-pl1-f194.google.com [209.85.214.194]) (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 290D929C339 for ; Sun, 4 Jan 2026 07:25:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.194 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767511559; cv=none; b=bL1ZXlAH3PzUyr627NBeBUo1iwVtG6MU7IIYk3U/Alhx11lJrpWqi5ylBFnyWMozdd/eYPix29S98jfHsXSk3QEquQ1eyQrUwOO/SH95VykV/BHozoW4W9LrwTUyTXm2IDFQWOLgOTUGDHVV21jr9jtiivpE3uxgI+QHEBNrXeE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767511559; c=relaxed/simple; bh=Q7L23drPSy6BbC3c8NXrPicDgbdQBA5CJY/RK5c/lNw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Vv4A+Txfwyg0G6P8kZ4J3dj7ZXcdYI43k0qoVSR5lfnhT3E9qlgk40CiGCun4lRb5wnNtxCEteoeTzKKJzwnUEAl5u6UIaBrOsdCUfMbsbOZiQHlH+UzFBXXXVdedkGID9QLi6k0CRlVFip/vTTX8756yajLvt3W9kyvv+LC22E= 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=JTtz91zg; arc=none smtp.client-ip=209.85.214.194 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="JTtz91zg" Received: by mail-pl1-f194.google.com with SMTP id d9443c01a7336-2a1388cdac3so120759725ad.0 for ; Sat, 03 Jan 2026 23:25:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1767511557; x=1768116357; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=DSo44/z7zWOYT1/ehhNtANRAoZe1/q8TtWQ8JjfW1zY=; b=JTtz91zgCJaxg/0kwja42+VbQvbg/GSO6Ne5ohopv8HdHPr+u5GlOGsHKXDiGTvP3k ecdKwS/kIkx810YWUNzbktwvKFxlp4q9lDD1haXZ++ZAO4byVxv7EjthFw3Z2cjqESiy bTNBmBwtV6ZJj22FMtGJulDqwEIBzdpd/mH7ksCnatzy4lnY1twCZiAuCnfj8KxQIosD nCtklbxDzZ1QVfB+Hv4eBQWy+nWJmqRBk5x84pIlOll3OHSbgM0sExadOQDcg6lvRBMu lKAES2MVzDRuw7jm7NJMnNzRbiIn8/9oD0ZvudGXApwixmCJY4520JKH/2vq4gZJ6BjG fKrw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1767511557; x=1768116357; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=DSo44/z7zWOYT1/ehhNtANRAoZe1/q8TtWQ8JjfW1zY=; b=ahCD+a8f+e7vub9HKFtv3k0ZkjWzA9QZ796P04sKyo7EKJm6JCIR0ayiJOYG87xlJQ uyksMIXLhcMglUeNoPIjm+hRkyRC+s4AWJpCBmcr/irEGikbsCiASyZ8SCC6HQCfAfbT CG92x7SwYOmEThvrYmTxSGHVEDRPvwG1KxPsmon1QjB+98fTrUh0DSDFDHOm6h1VxWM1 O+oJdlfTXBbeng3a6a8wsngqhAcwF+9TPe0rb9O5zKIIkeXPa0bzb5UMtzfQgdAunNyJ pU8EWkmm5x1cXDbiZiANzPKEpeZzO/NIaWBntoL9DizGE/Pdr5dHel+3YUHF5k3A6hqD R+0g== X-Forwarded-Encrypted: i=1; AJvYcCWFL/SRhtD4allb3j3oz47EDW91qf5v3qAUC7Wki1A75qouXDoYZZPSHP+eRPYTHzEhjefTj/0op6Hh41E=@vger.kernel.org X-Gm-Message-State: AOJu0YyGt9ietvJgLjHKbi/2KVGasx2sGvXz9gJgKVGerR6Li7f0xvq0 8M9rQvcb3s/GB1PuH51YAWzqQMcsNl9AKWYAHYHzW3fIflU+qKSxHezu X-Gm-Gg: AY/fxX7RffvNxURUDcH7j0jWCCSaD4j0EG+9OetHHTZvY9WSFfebbjBZQrKjY1hR7hK kfSSnrdqTi706Km8lgcRVpU5zJ/ealG7Z6xqIbVX/GaATAl5F3Vmg4KVXgQjLZbiEvr8HXE7WvO CeuKCCXtD6+8ebebuAswWTnNSzFC051hQeLvhqkSEoobDoL6Awz5hG2jhhQyW6oUB1Dl5OCA4Bp k1O1OdKRAjwLdWVTrpUmZ2zBUr80o03hRiEW60x4vsjN/1R66FFQVJEjXWwTvoeQVaxYcANB1RD BqNrkxrRjKPMUohqqho/TI8u/hT53ee43CWg4LXQ2pV86QKEoUFw5Y5l08xsnCkTBKV/SC1w75R miXaaXUg0/jfxh/2F7vpgcBf3m2bYBundkGYINwvKFeqkqJ5odM4gbIfWBXthEkI4dcm0UnTk4Z 5sOEMlSgldvjl5EoBh7eQ+N9Qnujp7l5WQc8Z/1g== X-Google-Smtp-Source: AGHT+IF0+JuznrNihxBjroVLwcFtfTV2l8YUoNvx7LUfGB5aqrvGcf/ihV/5wOf4dXTmPeLG3jDf6A== X-Received: by 2002:a17:903:2f50:b0:2a0:d636:71e7 with SMTP id d9443c01a7336-2a2f2425b08mr484864605ad.13.1767511557430; Sat, 03 Jan 2026 23:25:57 -0800 (PST) Received: from lima-ubuntu.hz.ali.com ([47.246.98.217]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2a2f3c82858sm415291165ad.29.2026.01.03.23.25.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 03 Jan 2026 23:25:57 -0800 (PST) From: Qing Wang To: gaoxiang17@xiaomi.com, oleg@redhat.com, viro@zeniv.linux.org.uk, brauner@kernel.org Cc: mjguzik@gmail.com, Liam.Howlett@oracle.com, gxxa03070307@gmail.com, joel.granados@kernel.org, linux-kernel@vger.kernel.org, lorenzo.stoakes@oracle.com Subject: Re: [PATCH] pid: Add a judgment for ns null in pid_nr_ns Date: Sun, 4 Jan 2026 15:25:36 +0800 Message-Id: <20260104072536.883920-1-wangqing7171@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250802022123.3536934-1-gxxa03070307@gmail.com> References: <20250802022123.3536934-1-gxxa03070307@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Sat, 02 Aug 2025 at 10:21, Xiang Gao wrote: > __task_pid_nr_ns > ns = task_active_pid_ns(current); > pid_nr_ns(rcu_dereference(*task_pid_ptr(task, type)), ns); > if (pid && ns->level <= pid->level) { Hi, There was a bug report about the UAF(tsk->signal) in __task_pid_nr_ns, and I'm not sure whether it's related to this issue you're discussing. What do you think? [syzbot] [perf?] KASAN: slab-use-after-free Read in __task_pid_nr_ns https://syzkaller.appspot.com/bug?extid=e0378d4f4fe57aa2bdd0 Qing.