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Mon, 28 Jun 2021 03:28:19 +0000 From: Justin He To: Al Viro CC: Linus Torvalds , Petr Mladek , Steven Rostedt , Sergey Senozhatsky , Andy Shevchenko , Rasmus Villemoes , Jonathan Corbet , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , "Eric W . Biederman" , "Darrick J. Wong" , "Peter Zijlstra (Intel)" , Ira Weiny , Eric Biggers , "Ahmed S. Darwish" , "open list:DOCUMENTATION" , Linux Kernel Mailing List , linux-s390 , linux-fsdevel Subject: RE: [PATCH 13/14] d_path: prepend_path() is unlikely to return non-zero Thread-Topic: [PATCH 13/14] d_path: prepend_path() is unlikely to return non-zero Thread-Index: AQHXTEjX4vA9qb1/tUuDI9sxRSQuQasklodQgACoVwCAA7zVQA== Date: Mon, 28 Jun 2021 03:28:19 +0000 Message-ID: References: <20210519004901.3829541-1-viro@zeniv.linux.org.uk> <20210519004901.3829541-13-viro@zeniv.linux.org.uk> In-Reply-To: Accept-Language: en-US, zh-CN Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ts-tracking-id: CB6421B20A6A944D9DF13BCBB5286C75.0 x-checkrecipientchecked: true Authentication-Results-Original: zeniv.linux.org.uk; dkim=none (message not signed) header.d=none;zeniv.linux.org.uk; dmarc=none action=none header.from=arm.com; x-originating-ip: [203.126.0.112] x-ms-publictraffictype: Email X-MS-Office365-Filtering-Correlation-Id: fa6a8db3-911a-4a8e-a4c2-08d939e4d100 x-ms-traffictypediagnostic: AS8PR08MB6341:|AM0PR08MB3186: X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true nodisclaimer: true x-ms-oob-tlc-oobclassifiers: OLM:9508;OLM:9508; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB6341 Original-Authentication-Results: zeniv.linux.org.uk; dkim=none (message not signed) header.d=none;zeniv.linux.org.uk; dmarc=none action=none header.from=arm.com; X-EOPAttributedMessage: 0 X-MS-Exchange-Transport-CrossTenantHeadersStripped: AM5EUR03FT048.eop-EUR03.prod.protection.outlook.com X-MS-Office365-Filtering-Correlation-Id-Prvs: b5db230a-0312-4b26-0144-08d939e4c6c1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:63.35.35.123;CTRY:IE;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:64aa7808-outbound-1.mta.getcheckrecipient.com;PTR:ec2-63-35-35-123.eu-west-1.compute.amazonaws.com;CAT:NONE;SFS:(4636009)(136003)(346002)(376002)(396003)(39850400004)(46966006)(36840700001)(6506007)(8676002)(47076005)(53546011)(4326008)(82310400003)(336012)(2906002)(450100002)(966005)(70586007)(70206006)(478600001)(86362001)(5660300002)(52536014)(81166007)(316002)(186003)(83380400001)(356005)(9686003)(8936002)(54906003)(7696005)(26005)(36860700001)(55016002)(33656002)(82740400003)(6862004);DIR:OUT;SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Jun 2021 03:28:37.0153 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: fa6a8db3-911a-4a8e-a4c2-08d939e4d100 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: AM5EUR03FT048.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR08MB3186 Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org Hi Al > -----Original Message----- > From: Al Viro On Behalf Of Al Viro > Sent: Saturday, June 26, 2021 1:59 AM > To: Justin He > Cc: Linus Torvalds ; Petr Mladek > ; Steven Rostedt ; Sergey > Senozhatsky ; Andy Shevchenko > ; Rasmus Villemoes > ; Jonathan Corbet ; Heiko > Carstens ; Vasily Gorbik ; Christia= n > Borntraeger ; Eric W . Biederman > ; Darrick J. Wong ; Peter > Zijlstra (Intel) ; Ira Weiny ; > Eric Biggers ; Ahmed S. Darwish > ; open list:DOCUMENTATION doc@vger.kernel.org>; Linux Kernel Mailing List kernel@vger.kernel.org>; linux-s390 ; linux- > fsdevel > Subject: Re: [PATCH 13/14] d_path: prepend_path() is unlikely to return > non-zero > > On Fri, Jun 25, 2021 at 08:00:49AM +0000, Justin He wrote: > > --- a/fs/d_path.c > > +++ b/fs/d_path.c > > @@ -210,6 +210,7 @@ static int prepend_path(const struct path *path, > > b =3D *p; > > read_seqbegin_or_lock(&rename_lock, &seq); > > error =3D __prepend_path(path->dentry, real_mount(path->mnt), r= oot, > &b); > > + printk("prepend=3D%d",error); > > if (!(seq & 1)) > > rcu_read_unlock(); > > if (need_seqretry(&rename_lock, seq)) { > > > > Then the result seems a little different: > > root@entos-ampere-02:~# dmesg |grep prepend=3D1 |wc -l > > 7417 > > root@entos-ampere-02:~# dmesg |grep prepend=3D0 |wc -l > > 772 > > > > The kernel is 5.13.0-rc2+ + this series + my '%pD' series > > > > Any thoughts? > > On which loads? 1 here is "mount/dentry pair is in somebody > else's namespace or outside of the subtree we are chrooted > into". IOW, what's calling d_path() on your setup? No special loads, merely collecting the results after kernel boots up. To narrow down, I tested your branch [1] *without* my '%pD' series: [1] https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git/log/?h=3Dw= ork.d_path The result is the same after kernel boots up. The call trace are as follows: The prepend_path returns 1: Call trace: prepend_path+0x144/0x340 d_absolute_path+0x6c/0xb8 aa_path_name+0x1c0/0x3d8 profile_transition+0x90/0x908 apparmor_bprm_creds_for_exec+0x914/0xaf0 security_bprm_creds_for_exec+0x34/0x50 bprm_execve+0x178/0x668 do_execveat_common.isra.47+0x1b4/0x1c8 __arm64_sys_execve+0x44/0x58 invoke_syscall+0x54/0x110 el0_svc_common.constprop.2+0x5c/0xe0 do_el0_svc+0x34/0xa0 el0_svc+0x20/0x30 el0_sync_handler+0x88/0xb0 el0_sync+0x148/0x180 The prepend_path returns 0: Call trace: prepend_path+0x144/0x340 d_path+0x110/0x158 proc_pid_readlink+0xbc/0x1b8 vfs_readlink+0x14c/0x170 do_readlinkat+0x134/0x168 __arm64_sys_readlinkat+0x28/0x38 invoke_syscall+0x54/0x110 el0_svc_common.constprop.2+0x5c/0xe0 do_el0_svc+0x34/0xa0 el0_svc+0x20/0x30 el0_sync_handler+0x88/0xb0 el0_sync+0x148/0x180 IMPORTANT NOTICE: The contents of this email and any attachments are confid= ential and may also be privileged. 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