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15.20.8632.017; Tue, 8 Apr 2025 14:39:59 +0000 Message-ID: Date: Tue, 8 Apr 2025 22:39:52 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 6.6.y 0/6] Backported patches to fix selftest tpdir2 To: Greg KH Cc: stable@vger.kernel.org, viro@zeniv.linux.org.uk, brauner@kernel.org, ebiederm@xmission.com, keescook@chromium.org, akpm@linux-foundation.org, wenlin.kang@windriver.com References: <20250402082656.4177277-1-wenlin.kang@windriver.com> <2025040344-coma-strict-4e8f@gregkh> <17b170ac-aa20-4c36-a045-25d2f82e66d0@windriver.com> <2025040819-unabashed-maximum-8fc8@gregkh> <2025040832-replay-trout-b9aa@gregkh> Content-Language: en-US From: Kang Wenlin In-Reply-To: <2025040832-replay-trout-b9aa@gregkh> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: TYWPR01CA0045.jpnprd01.prod.outlook.com (2603:1096:400:17f::15) To DS0PR11MB6325.namprd11.prod.outlook.com (2603:10b6:8:cf::11) Precedence: bulk X-Mailing-List: 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DS0PR11MB6325.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Apr 2025 14:39:59.4789 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 8ddb2873-a1ad-4a18-ae4e-4644631433be X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: ZXdkiUZ3ld+YKzxMmYdYscV427lAgBrwse4XkjPQHQeFLUhbeN5k8uwGtUi26M1g8KePbjyT1RL1nE0IzZQWng1Dc5DqMxz8LQqYPZNWo7c= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR11MB6133 X-Proofpoint-GUID: 7_GBfggYJT41q1-5NAc-RWNIPQYQ3XHV X-Proofpoint-ORIG-GUID: 7_GBfggYJT41q1-5NAc-RWNIPQYQ3XHV X-Authority-Analysis: v=2.4 cv=QOZoRhLL c=1 sm=1 tr=0 ts=67f53542 cx=c_pps a=mEL9+5ifO1KfKUNINL6WGg==:117 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=XR8D0OoHHMoA:10 a=VwQbUJbxAAAA:8 a=t7CeM3EgAAAA:8 a=VuW8G2IGCPahEAm7PdUA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=FdTzh2GWekK77mhwV6Dw:22 X-Sensitive_Customer_Information: Yes X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1095,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-04-08_06,2025-04-08_03,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 mlxlogscore=845 bulkscore=0 phishscore=0 impostorscore=0 priorityscore=1501 clxscore=1015 lowpriorityscore=0 spamscore=0 mlxscore=0 malwarescore=0 adultscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.21.0-2502280000 definitions=main-2504080103 On 4/8/2025 17:55, Greg KH wrote: > CAUTION: This email comes from a non Wind River email account! > Do not click links or open attachments unless you recognize the sender and know the content is safe. > > On Tue, Apr 08, 2025 at 05:50:06PM +0800, Wenlin Kang wrote: >> On 4/8/25 17:06, Greg KH wrote: >>> CAUTION: This email comes from a non Wind River email account! >>> Do not click links or open attachments unless you recognize the sender and know the content is safe. >>> >>> On Fri, Apr 04, 2025 at 03:58:36PM +0800, Kang Wenlin wrote: >>>> Hi Greg >>>> >>>> Thanks for your response. >>>> >>>> >>>> On 4/3/2025 22:52, Greg KH wrote: >>>>> CAUTION: This email comes from a non Wind River email account! >>>>> Do not click links or open attachments unless you recognize the sender and know the content is safe. >>>>> >>>>> On Wed, Apr 02, 2025 at 04:26:50PM +0800, Kang Wenlin wrote: >>>>>> From: Wenlin Kang >>>>>> >>>>>> The selftest tpdir2 terminated with a 'Segmentation fault' during loading. >>>>>> >>>>>> root@localhost:~# cd linux-kenel/tools/testing/selftests/arm64/abi && make >>>>>> root@localhost:~/linux-kernel/tools/testing/selftests/arm64/abi# ./tpidr2 >>>>>> Segmentation fault >>>>>> >>>>>> The cause of this is the __arch_clear_user() failure. >>>>>> >>>>>> load_elf_binary() [fs/binfmt_elf.c] >>>>>> -> if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bes))) >>>>>> -> padzero() >>>>>> -> clear_user() [arch/arm64/include/asm/uaccess.h] >>>>>> -> __arch_clear_user() [arch/arm64/lib/clear_user.S] >>>>>> >>>>>> For more details, please see: >>>>>> https://lore.kernel.org/lkml/1d0342f3-0474-482b-b6db-81ca7820a462@t-8ch.de/T/ >>>>> This is just a userspace issue (i.e. don't do that, and if you do want >>>>> to do that, use a new kernel!) >>>>> >>>>> Why do these changes need to be backported, do you have real users that >>>>> are crashing in this way to require these changes? >>>> This issue was identified during our internal testing, and I found >>>> similar cases discussed in the link above. Upon reviewing the kernel >>>> code, I noticed that a patch series already accepted into mainline >>>> addresses this problem. Since these patches are already upstream >>>> and effectively resolve the issue, I decided to backport them. >>>> We believe this provides a more robust and maintainable solution >>>> compared to relying on users to avoid the triggering behavior. >>> Fixing something just to get the selftests to pass is fine, but do you >>> actually know of a real-world case where this is a problem that needs to >>> be resolved? That's what I'm asking here, do you have users that have >>> run into this issue? I ask as it's not a regression from what I can >>> determine, but rather a new "feature". >> >> Thanks for your explanation. >> I’m not aware of any real-world cases. As of now, apart from our >> internal testing, we haven’t had any users report this issue. > Ok, I'll drop this from the review queue. Got it, thanks for letting me know. > > thanks, > > greg k-h -- -- Thanks Wenlin Kang