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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 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?