================================================================== 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 ffff8881446fea90 by task syz.6.1103/10180 CPU: 0 UID: 0 PID: 10180 Comm: syz.6.1103 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: 0033:0x7f39cf18ebe9 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:00007f39d0046038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f39cf3c6090 RCX: 00007f39cf18ebe9 RDX: 0000200000000300 RSI: 00000000c00c642e RDI: 0000000000000008 RBP: 00007f39cf211e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f39cf3c6128 R14: 00007f39cf3c6090 R15: 00007ffe59e82b68 Allocated by task 10180: 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 ffff8881446fea80 which belongs to the cache kmalloc-16 of size 16 The buggy address is located 0 bytes to the right of allocated 16-byte region [ffff8881446fea80, ffff8881446fea90) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1446fe flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 057ff00000000000 ffff88801a841640 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080800080 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 3813619874, free_ts 0 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 kvasprintf+0xdc/0x190 lib/kasprintf.c:25 kobject_set_name_vargs+0x61/0x110 lib/kobject.c:274 dev_set_name+0xd4/0x120 drivers/base/core.c:3492 pci_setup_device+0x4ba/0x2570 drivers/pci/probe.c:2024 pci_scan_device drivers/pci/probe.c:2608 [inline] pci_scan_single_device+0x3de/0x510 drivers/pci/probe.c:2780 pci_scan_slot+0x1e3/0x590 drivers/pci/probe.c:2867 pci_scan_child_bus_extend+0x5e/0x720 drivers/pci/probe.c:3086 acpi_pci_root_create+0xa75/0xca0 drivers/acpi/pci_root.c:1049 page_owner free stack trace missing Memory state around the buggy address: ffff8881446fe980: 00 00 fc fc 00 00 fc fc 00 00 fc fc 00 00 fc fc ffff8881446fea00: 00 00 fc fc 00 00 fc fc 00 00 fc fc fa fb fc fc >ffff8881446fea80: 00 00 fc fc 00 00 fc fc 00 00 fc fc 00 00 fc fc ^ ffff8881446feb00: 00 00 fc fc 00 00 fc fc 00 00 fc fc 00 00 fc fc ffff8881446feb80: 00 00 fc fc 00 00 fc fc 00 00 fc fc 00 00 fc fc ==================================================================