From nobody Sat Sep 26 08:39:16 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (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 510AE3F6606; Thu, 3 Sep 2026 06:49:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788418156; cv=none; b=aRztsE7XVTU0ChHqzMimeU9Zv221w/0rqB0T4qRKkjmk0wP/gcmYcrNdqbmSpsS7cOMapLh9RsjbdHNc037TeSKf38wCIJSDZ5P1a4E4f+2L5CQcEaaRCvqbrMPGrvxV+E5+5wp7LTVrh9xh2r72Mzxd2+omFJ1IV4un+tGF4xo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788418156; c=relaxed/simple; bh=ITcyZIhg7nHCVCO4TfKxdewWsAYjllnLRwXVfU0Z6/E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Np1slsiRF0gQlDt7cG3Glxrx3GvrW365JSaKi8YR25nT4g8US/rQSf+W56eidgRYRVzncxUaYE9vshe+x72o7Zu/GdzNP4RWXztOEbrpANJ8b3T6rAKtrSkstQJFC7A0KI0OtU2A+LogYIbMQdlG5YF9N6mgUHb7mLoR5yPGEg8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: 8e8edd48a76311f19a56ed5b684f684d-20260903 X-CTIC-Tags: HR_CC_COUNT, HR_CC_DOMAIN_COUNT, HR_CC_NAME, HR_CC_NO_NAME, HR_CHARSET HR_CHARSET_NUM, HR_CTE_8B, HR_CTT_MISS, HR_DATE_H, HR_DATE_WKD HR_DATE_ZONE, HR_FROM_NAME, HR_SJ_DIGIT_LEN, HR_SJ_LANG, HR_SJ_LEN HR_SJ_LETTER, HR_SJ_NOR_SYM, HR_SJ_PHRASE, HR_SJ_PHRASE_LEN, HR_SJ_WS HR_TO_CHARSET, HR_TO_CHARSET_NUM, HR_TO_COUNT, HR_TO_DOMAIN_COUNT, HR_TO_NAME IP_TRUSTED, SRC_TRUSTED, DN_TRUSTED, SA_TRUSTED, SA_EXISTED SN_EXISTED, SPF_NOPASS, DKIM_NOPASS, DMARC_NOPASS, CIE_GOOD CIE_GOOD_SPF, GTI_FG_BS, GTI_RG_INFO, GTI_C_BU, AMN_GOOD ABX_MISS_RDNS X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.19,REQID:5463783f-ec7f-4fdd-8e53-a063965ce591,IP:10, URL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION :release,TS:10 X-CID-INFO: VERSION:1.3.19,REQID:5463783f-ec7f-4fdd-8e53-a063965ce591,IP:10,UR L:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION:r elease,TS:10 X-CID-META: VersionHash:7db8b62,CLOUDID:7026490707da4f01151f4d5dfb7a2ff8,BulkI D:260903144908A8YRXFCY,BulkQuantity:0,SF:10|38|66|78|81|82|102|127|865|898 ,TC:nil,Content:0|15|50,EDM:-3,IP:-2,URL:0,File:nil,RT:nil,Bulk:nil,QS:nil ,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: 8e8edd48a76311f19a56ed5b684f684d-20260903 X-User: sunshaojie@kylinos.cn Received: from sunshaojie-pc [(223.70.159.239)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA with TLSv1.3 TLS_AES_256_GCM_SHA384 256/256) with ESMTP id 1126170251; Thu, 03 Sep 2026 14:49:06 +0800 From: Shaojie Sun To: Tejun Heo , Johannes Weiner , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Christian Brauner , Alexander Viro Cc: Jan Kara , Pavel Tikhomirov , cgroups@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Shaojie Sun Subject: [PATCH v2 1/3] cgroup: namespace: drop BUG_ON() in copy_cgroup_ns() Date: Thu, 3 Sep 2026 14:48:26 +0800 Message-ID: <20260903064828.126643-2-sunshaojie@kylinos.cn> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260903064828.126643-1-sunshaojie@kylinos.cn> References: <20260903064828.126643-1-sunshaojie@kylinos.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The sole caller, create_new_namespaces(), always passes a valid cgroup namespace pointer from the task's nsproxy. The other copy_*_ns() helpers, e.g. copy_time_ns() and copy_pid_ns(), don't perform such a check either. Drop the BUG_ON() for consistency with them. Signed-off-by: Shaojie Sun Reviewed-by: Tao Cui --- kernel/cgroup/namespace.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/kernel/cgroup/namespace.c b/kernel/cgroup/namespace.c index ea4ee13936be..76660332ec64 100644 --- a/kernel/cgroup/namespace.c +++ b/kernel/cgroup/namespace.c @@ -53,8 +53,6 @@ struct cgroup_namespace *copy_cgroup_ns(u64 flags, struct ucounts *ucounts; struct css_set *cset; =20 - BUG_ON(!old_ns); - if (!(flags & CLONE_NEWCGROUP)) { get_cgroup_ns(old_ns); return old_ns; --=20 2.50.1 From nobody Sat Sep 26 08:39:16 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (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 9CD593FA5FC; Thu, 3 Sep 2026 06:49:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788418158; cv=none; b=h7E3GfK9ymAwbd4yiC83Q1pYxYj6JHovTu8/W6/ZxLCHkBjPWQGaZKthTcsAb9DJz1Epj+J+sabsaNkxAjfXFzjwowznE4cHriv+uQtEfQosGprj/YkE6NcmOhC/MO6qCMFZg2DFUL4J9JXx4T29NSAXxxfAoUHR67mccg6gQE4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788418158; c=relaxed/simple; bh=aZZr4zr034G+THgX3ixcdzPQPVQx1+vOz6WY1Q4mQTo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QFh9hHxuv4lzh7l461637IV07rKf6WODZ7Mm/qgB6Hh1flHEKb6j9n3ItdWB0ijRGtGKJPk3DYBtyTzzEBb64GXFAa5tijfgeDDNs8s60t0avgttxP7GtcurhX+UIIyKT9HeGJaLj63qRXrCVPw3lTzrVkjzHcXb5DXkBQpuCew= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: 9046894ca76311f19a56ed5b684f684d-20260903 X-CTIC-Tags: HR_CC_COUNT, HR_CC_DOMAIN_COUNT, HR_CC_NAME, HR_CC_NO_NAME, HR_CHARSET HR_CHARSET_NUM, HR_CTE_8B, HR_CTT_MISS, HR_DATE_H, HR_DATE_WKD HR_DATE_ZONE, HR_FROM_NAME, HR_SJ_DIGIT_LEN, HR_SJ_LANG, HR_SJ_LEN HR_SJ_LETTER, HR_SJ_NOR_SYM, HR_SJ_PHRASE, HR_SJ_PHRASE_LEN, HR_SJ_WS HR_TO_CHARSET, HR_TO_CHARSET_NUM, HR_TO_COUNT, HR_TO_DOMAIN_COUNT, HR_TO_NAME IP_TRUSTED, SRC_TRUSTED, DN_TRUSTED, SA_TRUSTED, SA_EXISTED SN_EXISTED, SPF_NOPASS, DKIM_NOPASS, DMARC_NOPASS, CIE_GOOD CIE_GOOD_SPF, GTI_FG_BS, GTI_RG_INFO, GTI_C_BU, AMN_GOOD ABX_MISS_RDNS X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.19,REQID:a808a087-a285-4df6-a7a7-8589eebfba1b,IP:10, URL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION :release,TS:10 X-CID-INFO: VERSION:1.3.19,REQID:a808a087-a285-4df6-a7a7-8589eebfba1b,IP:10,UR L:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION:r elease,TS:10 X-CID-META: VersionHash:7db8b62,CLOUDID:5a54df9d10b5416a0c6180bad28d5197,BulkI D:260903144911LVHUEQTP,BulkQuantity:0,SF:10|38|66|78|81|82|102|127|865|898 ,TC:nil,Content:0|15|50,EDM:-3,IP:-2,URL:0,File:nil,RT:nil,Bulk:nil,QS:nil ,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: 9046894ca76311f19a56ed5b684f684d-20260903 X-User: sunshaojie@kylinos.cn Received: from sunshaojie-pc [(223.70.159.239)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA with TLSv1.3 TLS_AES_256_GCM_SHA384 256/256) with ESMTP id 1997845403; Thu, 03 Sep 2026 14:49:08 +0800 From: Shaojie Sun To: Tejun Heo , Johannes Weiner , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Christian Brauner , Alexander Viro Cc: Jan Kara , Pavel Tikhomirov , cgroups@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Shaojie Sun Subject: [PATCH v2 2/3] uts: drop BUG_ON() in copy_utsname() Date: Thu, 3 Sep 2026 14:48:27 +0800 Message-ID: <20260903064828.126643-3-sunshaojie@kylinos.cn> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260903064828.126643-1-sunshaojie@kylinos.cn> References: <20260903064828.126643-1-sunshaojie@kylinos.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The sole caller, create_new_namespaces(), always passes a valid uts namespace pointer from the task's nsproxy. The other copy_*_ns() helpers, e.g. copy_time_ns() and copy_pid_ns(), don't perform such a check either. Drop the BUG_ON() for consistency with them. Signed-off-by: Shaojie Sun Reviewed-by: Bradley Morgan --- kernel/utsname.c | 1 - 1 file changed, 1 deletion(-) diff --git a/kernel/utsname.c b/kernel/utsname.c index ebbfc578a9d3..1ebf87e24607 100644 --- a/kernel/utsname.c +++ b/kernel/utsname.c @@ -81,7 +81,6 @@ struct uts_namespace *copy_utsname(u64 flags, { struct uts_namespace *new_ns; =20 - BUG_ON(!old_ns); get_uts_ns(old_ns); =20 if (!(flags & CLONE_NEWUTS)) --=20 2.50.1 From nobody Sat Sep 26 08:39:16 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (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 4834B3E8357; Thu, 3 Sep 2026 06:49:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788418167; cv=none; b=JxebcDXciiaw4oknII3yUletwDiWzfKVBRrrD9SHOsW5CNUuEvDbn+xh4N+cPe5+JMcruk0jYHYwcXgvmbUjgX/GfDzJLjaTpf/t3q4Rj9a3F+ANnxWH3AclO42rKI9l1TGSs/K6qWt3dSw0uKQMmDZgLEFbH08aGSJA02z/qyg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788418167; c=relaxed/simple; bh=3OM5M7QuU6cV3txn9PLrQq/F9jkAhbAnJpljf/VHO/s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=riL1G4D+ijW3/GdccKowd7S+TkOFC+XK9d4WGoTpr7PwNMEowIFg3t3F22Gg6ZUDKwkkhXbu/yPYcxdFFiyxCnRmj7WZ92HSISHaiOnUNVbkfsMvoX+BA5GVLWm8T4M7rAHTEIdF8Kew0+vPVhq1xkeHDwPyqGIn0gCh3L0WELs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: 91ed52f8a76311f19a56ed5b684f684d-20260903 X-CTIC-Tags: HR_CC_COUNT, HR_CC_DOMAIN_COUNT, HR_CC_NAME, HR_CC_NO_NAME, HR_CHARSET HR_CHARSET_NUM, HR_CTE_8B, HR_CTT_MISS, HR_DATE_H, HR_DATE_WKD HR_DATE_ZONE, HR_FROM_NAME, HR_SJ_DIGIT_LEN, HR_SJ_LANG, HR_SJ_LEN HR_SJ_LETTER, HR_SJ_NOR_SYM, HR_SJ_PHRASE, HR_SJ_PHRASE_LEN, HR_SJ_WS HR_TO_CHARSET, HR_TO_CHARSET_NUM, HR_TO_COUNT, HR_TO_DOMAIN_COUNT, HR_TO_NAME IP_TRUSTED, SRC_TRUSTED, DN_TRUSTED, SA_TRUSTED, SA_EXISTED SN_EXISTED, SPF_NOPASS, DKIM_NOPASS, DMARC_NOPASS, OB_FP CIE_GOOD, CIE_GOOD_SPF, GTI_FG_BS, GTI_RG_INFO, GTI_C_BU AMN_GOOD, ABX_MISS_RDNS X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.19,REQID:e2c0e359-3e0f-44a8-8220-772083e7a699,IP:10, URL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION :release,TS:10 X-CID-INFO: VERSION:1.3.19,REQID:e2c0e359-3e0f-44a8-8220-772083e7a699,IP:10,UR L:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION:r elease,TS:10 X-CID-META: VersionHash:7db8b62,CLOUDID:dfb0a1b2ded5297fb51d5859d0ad900e,BulkI D:260903144917PXU0U8R4,BulkQuantity:0,SF:10|38|66|78|81|82|102|127|865|898 ,TC:nil,Content:0|15|50,EDM:-3,IP:-2,URL:0,File:nil,RT:nil,Bulk:nil,QS:nil ,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: 91ed52f8a76311f19a56ed5b684f684d-20260903 X-User: sunshaojie@kylinos.cn Received: from sunshaojie-pc [(223.70.159.239)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA with TLSv1.3 TLS_AES_256_GCM_SHA384 256/256) with ESMTP id 292325350; Thu, 03 Sep 2026 14:49:11 +0800 From: Shaojie Sun To: Tejun Heo , Johannes Weiner , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Christian Brauner , Alexander Viro Cc: Jan Kara , Pavel Tikhomirov , cgroups@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Shaojie Sun Subject: [PATCH v2 3/3] fs: namespace: drop BUG_ON() in copy_mnt_ns() Date: Thu, 3 Sep 2026 14:48:28 +0800 Message-ID: <20260903064828.126643-4-sunshaojie@kylinos.cn> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260903064828.126643-1-sunshaojie@kylinos.cn> References: <20260903064828.126643-1-sunshaojie@kylinos.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The sole caller, create_new_namespaces(), always passes a valid mount namespace pointer from the task's nsproxy. The other copy_*_ns() helpers, e.g. copy_time_ns() and copy_pid_ns(), don't perform such a check either. Drop the BUG_ON() for consistency with them. Signed-off-by: Shaojie Sun Reviewed-by: Jan Kara Reviewed-by: Tao Cui --- fs/namespace.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/fs/namespace.c b/fs/namespace.c index 1ecd96c918b3..0f35c8c14027 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -4247,8 +4247,6 @@ struct mnt_namespace *copy_mnt_ns(u64 flags, struct m= nt_namespace *ns, struct mount *new; int copy_flags; =20 - BUG_ON(!ns); - if (likely(!(flags & CLONE_NEWNS))) { get_mnt_ns(ns); return ns; --=20 2.50.1