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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: zlnFFlv3XdrkWpyuRSXuHB5pUXNj9BCTdjiPaJJjCg8UJDBlIVr5TZ35F2SWbHbV57SB2t9OO56T3R52fzQ6wYLVYj21AIrAz5AmI7dWCQUAwKGpQqr4QT/SJMww8WU8z/a21bUkXji2nNjIPe5GySpnvBrkpT0rGViiOFPicSHXmntl05LVkqoELsmsrlS9+hjZnbpzuocxbWiBs1fCuECdaPOkWFWbAFBibRfscgHaEZ+RH1BYeaC+yLV7pavejhB5cvcWfT/VBHdmHyoxP2eJqzDhogHi4pF4D1x9SnMmHPSxsiH6LyT41NFmdq2pT9x5/AzFboq1efvUHthAfUf/EWrEerWQYX0h0j9gPECXZzz1j666ZY3/DXHyP0G3DkwyyrDktZlKP0RLiSWrodJPaVJpy8xFO699ie8eWi7K9kQFmaVvV7XFV9gaXvgK X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 Mar 2026 07:55:13.3613 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a3f607ba-f69b-452e-1343-08de8efad714 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: AMS1EPF00000091.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM7PR08MB5509 On 31/03/2026 3:00 am, Ke Zhao wrote: > > On 3/31/2026 4:39 AM, Usama Anjum wrote: >> On 30/03/2026 9:36 am, Ke Zhao wrote: >>> Some page allocation paths that call post_alloc_hook() but skip >>> kmsan_alloc_page(), leaving stale KMSAN shadow on allocated pages. >>> Fix this by explicitly calling kmsan_alloc_page() after they >>> successfully get new pages. >>> >>> Reported-by:syzbot+2aee6839a252e612ce34@syzkaller.appspotmail.com >>> Closes:https://syzkaller.appspot.com/bug?extid=2aee6839a252e612ce34 >>> >>> Signed-off-by: Ke Zhao >>> --- >>> mm/page_alloc.c | 13 +++++++++++++ >>> 1 file changed, 13 insertions(+) >>> >>> diff --git a/mm/page_alloc.c b/mm/page_alloc.c >>> index 2d4b6f1a554e..6435e8708ef4 100644 >>> --- a/mm/page_alloc.c >>> +++ b/mm/page_alloc.c >>> @@ -5189,6 +5189,10 @@ unsigned long alloc_pages_bulk_noprof(gfp_t gfp, int preferred_nid, >>> >>> prep_new_page(page, 0, gfp, 0); >>> set_page_refcounted(page); >>> + >>> + trace_mm_page_alloc(page, 0, gfp, ac.migratetype); >>> + kmsan_alloc_page(page, 0, gfp); >>> + >>> page_array[nr_populated++] = page; >>> } >>> >>> @@ -6911,6 +6915,12 @@ static void split_free_frozen_pages(struct list_head *list, gfp_t gfp_mask) >>> int i; >>> >>> post_alloc_hook(page, order, gfp_mask); >>> + /* >>> + * Initialize KMSAN state right after post_alloc_hook(). >>> + * This prepares the pages for subsequent outer callers >>> + * that might free sub-pages after the split. >>> + */ >>> + kmsan_alloc_page(page, order, gfp_mask); >>> if (!order) >>> continue; >>> >>> @@ -7117,6 +7127,9 @@ int alloc_contig_frozen_range_noprof(unsigned long start, unsigned long end, >>> >>> check_new_pages(head, order); >>> prep_new_page(head, order, gfp_mask, 0); >>> + >>> + trace_mm_page_alloc(page, order, gfp_mask, get_pageblock_migratetype(page)); >>> + kmsan_alloc_page(page, order, gfp_mask); >> There is no page defined in this function. Most probably you wanted >> to use head in place of page here. >> >> How did you compiled and tested this change? > Sorry, I just simply compiled with the change but add wrong code into > the commit. I can hardly make an environment that could trigger the same > warning here. I'm not sure if I can trigger syzbot to test this. Please try to send another version (v2) of this patch and then [1] follow instructions mentioned here. [1] https://github.com/google/syzkaller/blob/master/docs/syzbot.md#testing-patches >>> } else { >>> ret = -EINVAL; >>> WARN(true, "PFN range: requested [%lu, %lu), allocated [%lu, %lu)\n", >>> >>> --- >>> base-commit: bbeb83d3182abe0d245318e274e8531e5dd7a948 >>> change-id: 20260325-fix-kmsan-e291f752a949 >>> >>> Best regards, >> Thanks, >> Usama