================================================================== BUG: KASAN: slab-out-of-bounds in __cpa_addr arch/x86/mm/pat/set_memory.c:309 [inline] BUG: KASAN: slab-out-of-bounds in cpa_flush arch/x86/mm/pat/set_memory.c:449 [inline] BUG: KASAN: slab-out-of-bounds in change_page_attr_set_clr+0x625/0xfc0 arch/x86/mm/pat/set_memory.c:2115 Read of size 8 at addr ffff88802782c408 by task syz.2.278/6866 CPU: 1 UID: 0 PID: 6866 Comm: syz.2.278 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 __cpa_addr arch/x86/mm/pat/set_memory.c:309 [inline] cpa_flush arch/x86/mm/pat/set_memory.c:449 [inline] change_page_attr_set_clr+0x625/0xfc0 arch/x86/mm/pat/set_memory.c:2115 cpa_set_pages_array arch/x86/mm/pat/set_memory.c:2137 [inline] _set_pages_array+0x145/0x270 arch/x86/mm/pat/set_memory.c:2521 drm_gem_shmem_get_pages_locked+0x2d0/0x440 drivers/gpu/drm/drm_gem_shmem_helper.c:214 drm_gem_shmem_pin_locked+0x22c/0x460 drivers/gpu/drm/drm_gem_shmem_helper.c:261 drm_gem_map_attach+0x19c/0x1f0 drivers/gpu/drm/drm_prime.c:620 dma_buf_dynamic_attach+0x1e7/0x3d0 drivers/dma-buf/dma-buf.c:974 drm_gem_shmem_prime_import_no_map+0xc1/0x2f0 drivers/gpu/drm/drm_gem_shmem_helper.c:835 drm_gem_prime_fd_to_handle+0x196/0x4d0 drivers/gpu/drm/drm_prime.c:313 drm_ioctl_kernel+0x2cc/0x390 drivers/gpu/drm/drm_ioctl.c:797 drm_ioctl+0x67f/0xb10 drivers/gpu/drm/drm_ioctl.c:894 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6e8f38ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6e90181038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f6e8f5c5fa0 RCX: 00007f6e8f38ebe9 RDX: 0000200000000300 RSI: 00000000c00c642e RDI: 0000000000000006 RBP: 00007f6e8f411e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6e8f5c6038 R14: 00007f6e8f5c5fa0 R15: 00007ffeaee681e8 Allocated by task 6866: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:397 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:5366 [inline] __kvmalloc_node_noprof+0x5cd/0x910 mm/slub.c:6527 kvmalloc_array_node_noprof include/linux/slab.h:1118 [inline] drm_gem_get_pages+0x166/0xa20 drivers/gpu/drm/drm_gem.c:647 drm_gem_shmem_get_pages_locked+0x201/0x440 drivers/gpu/drm/drm_gem_shmem_helper.c:200 drm_gem_shmem_pin_locked+0x22c/0x460 drivers/gpu/drm/drm_gem_shmem_helper.c:261 drm_gem_map_attach+0x19c/0x1f0 drivers/gpu/drm/drm_prime.c:620 dma_buf_dynamic_attach+0x1e7/0x3d0 drivers/dma-buf/dma-buf.c:974 drm_gem_shmem_prime_import_no_map+0xc1/0x2f0 drivers/gpu/drm/drm_gem_shmem_helper.c:835 drm_gem_prime_fd_to_handle+0x196/0x4d0 drivers/gpu/drm/drm_prime.c:313 drm_ioctl_kernel+0x2cc/0x390 drivers/gpu/drm/drm_ioctl.c:797 drm_ioctl+0x67f/0xb10 drivers/gpu/drm/drm_ioctl.c:894 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802782c000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 0 bytes to the right of allocated 1032-byte region [ffff88802782c000, ffff88802782c408) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27828 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801a842000 ffffea0000915c00 dead000000000002 raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801a842000 ffffea0000915c00 dead000000000002 head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea00009e0a01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5858, tgid 5858 (syz-executor), ts 85328908467, free_ts 59121115638 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850 prep_new_page mm/page_alloc.c:1858 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3863 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5153 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:2996 [inline] allocate_slab+0x8a/0x330 mm/slub.c:3164 new_slab mm/slub.c:3218 [inline] ___slab_alloc+0xbd1/0x13f0 mm/slub.c:4420 __slab_alloc+0x55/0xa0 mm/slub.c:4511 __slab_alloc_node mm/slub.c:4586 [inline] slab_alloc_node mm/slub.c:4996 [inline] __do_kmalloc_node mm/slub.c:5365 [inline] __kmalloc_node_track_caller_noprof+0x5c7/0x800 mm/slub.c:5385 kmalloc_reserve+0x136/0x290 net/core/skbuff.c:600 pskb_expand_head+0x18e/0x1150 net/core/skbuff.c:2240 netlink_trim+0x1d5/0x2e0 net/netlink/af_netlink.c:1301 netlink_broadcast_filtered+0xd6/0x1000 net/netlink/af_netlink.c:1514 nlmsg_multicast_filtered include/net/netlink.h:1165 [inline] nlmsg_multicast include/net/netlink.h:1184 [inline] nlmsg_notify+0xf0/0x1a0 net/netlink/af_netlink.c:2595 rtnl_notify net/core/rtnetlink.c:958 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:4421 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:4437 [inline] rtnetlink_event+0x224/0x270 net/core/rtnetlink.c:7006 notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85 __netdev_upper_dev_link+0x3c3/0x590 net/core/dev.c:8728 page last free pid 5645 tgid 5645 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1394 [inline] __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2900 discard_slab mm/slub.c:3262 [inline] __put_partials+0x146/0x170 mm/slub.c:3727 put_cpu_partial+0x17c/0x250 mm/slub.c:3802 __slab_free+0x2b9/0x390 mm/slub.c:5555 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:349 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4710 [inline] slab_alloc_node mm/slub.c:5008 [inline] kmem_cache_alloc_noprof+0x367/0x6e0 mm/slub.c:5015 anon_vma_chain_alloc mm/rmap.c:141 [inline] __anon_vma_prepare+0xcb/0x4a0 mm/rmap.c:194 __vmf_anon_prepare mm/memory.c:3634 [inline] vmf_anon_prepare mm/internal.h:432 [inline] do_anonymous_page mm/memory.c:5178 [inline] do_pte_missing mm/memory.c:4360 [inline] handle_pte_fault mm/memory.c:6182 [inline] __handle_mm_fault+0x4aff/0x5400 mm/memory.c:6323 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6492 do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 Memory state around the buggy address: ffff88802782c300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88802782c380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88802782c400: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88802782c480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802782c500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================