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Wed, 6 Aug 2025 11:23:43 +0000 Message-ID: <3a565e1a-6a40-4bd1-a6e0-7f64b745d00f@arm.com> Date: Wed, 6 Aug 2025 16:53:38 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] WARNING in follow_page_pte To: syzbot+57bcc752f0df8bb1365c@syzkaller.appspotmail.com Cc: akpm@linux-foundation.org, david@redhat.com, jgg@ziepe.ca, jhubbard@nvidia.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, peterx@redhat.com, syzkaller-bugs@googlegroups.com References: <68930511.050a0220.7f033.003a.GAE@google.com> <20250806111922.669-1-dev.jain@arm.com> Content-Language: en-US From: Dev Jain In-Reply-To: <20250806111922.669-1-dev.jain@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MAXP287CA0002.INDP287.PROD.OUTLOOK.COM (2603:1096:a00:49::23) To AM9PR08MB7120.eurprd08.prod.outlook.com (2603:10a6:20b:3dc::22) MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: AM9PR08MB7120:EE_|AS1PR08MB7659:EE_|AMS0EPF000001B5:EE_|AS8PR08MB8160:EE_ X-MS-Office365-Filtering-Correlation-Id: d46f1ad5-4fb2-409f-da9f-08ddd4dbc76b x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230040|376014|366016|1800799024; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Aug 2025 11:24:16.4154 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d46f1ad5-4fb2-409f-da9f-08ddd4dbc76b X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AMS0EPF000001B5.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB8160 X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: D28388000B X-Stat-Signature: ip3n9u7spmjokz8rztjx4d6ighzwr9xx X-HE-Tag: 1754479460-335888 X-HE-Meta: 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 Yu4KFSGt /0CUpmMy2B6Rxq8DJJjSwMRLpkihOmMfGsyxpXTP6CGRcBNK3SgnG0H93cTvF9Ei8+WXNFY/K1UTpKv3F/PQfHBqf+Dcl4jqketLc X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 06/08/25 4:49 pm, Dev Jain wrote: > #syz test > > In commit_anon_folio_batch(), we iterate over all pages pointed to by the > PTE batch. Therefore we need to know the first page of the batch; > currently we derive that via folio_page(folio, 0), but, that takes us > to the first (head) page of the folio instead - our PTE batch may lie > in the middle of the folio, leading to incorrectness. > > Bite the bullet and throw away the micro-optimization of reusing the > folio in favour of code simplicity. Derive the page and the folio in > change_pte_range, and pass the page too to commit_anon_folio_batch to > fix the aforementioned issue. > > Also, instead of directly adding to the stuct page *page pointer, use > the nth_page() macro for safety. > > Fixes: cac1db8c3aad ("mm: optimize mprotect() by PTE batching") > Signed-off-by: Dev Jain > --- > mm/mprotect.c | 25 +++++++++++-------------- > 1 file changed, 11 insertions(+), 14 deletions(-) > Oops, this patch is based off mm-hotfixes-unstable, but I guess syzbot will need it rebased on Torvalds' master?