================================================================== 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 ffff888077fb7488 by task syz.2.1546/13952 CPU: 0 UID: 0 PID: 13952 Comm: syz.2.1546 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 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_mmap+0x193/0x460 drivers/gpu/drm/drm_gem_shmem_helper.c:646 drm_gem_mmap_obj+0x18a/0x4e0 drivers/gpu/drm/drm_gem.c:1167 drm_gem_mmap+0x384/0x640 drivers/gpu/drm/drm_gem.c:1245 vfs_mmap include/linux/fs.h:2405 [inline] mmap_file mm/internal.h:167 [inline] __mmap_new_file_vma mm/vma.c:2413 [inline] __mmap_new_vma mm/vma.c:2476 [inline] __mmap_region mm/vma.c:2670 [inline] mmap_region+0x18b4/0x2110 mm/vma.c:2740 do_mmap+0xc45/0x10d0 mm/mmap.c:558 vm_mmap_pgoff+0x2a6/0x4d0 mm/util.c:581 ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:604 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: 0033:0x7f37fcb8efc9 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:00007f37fdb04038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f37fcde5fa0 RCX: 00007f37fcb8efc9 RDX: 0000000000000004 RSI: 0000000000004000 RDI: 0000200000001000 RBP: 00007f37fcc11f91 R08: 0000000000000006 R09: 0000000100000000 R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f37fcde6038 R14: 00007f37fcde5fa0 R15: 00007f37fcf0fa28 Allocated by task 13952: 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:400 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417 kasan_kmalloc include/linux/kasan.h:262 [inline] __do_kmalloc_node mm/slub.c:5627 [inline] __kvmalloc_node_noprof+0x5cd/0x910 mm/slub.c:7081 kvmalloc_array_node_noprof include/linux/slab.h:1122 [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_mmap+0x193/0x460 drivers/gpu/drm/drm_gem_shmem_helper.c:646 drm_gem_mmap_obj+0x18a/0x4e0 drivers/gpu/drm/drm_gem.c:1167 drm_gem_mmap+0x384/0x640 drivers/gpu/drm/drm_gem.c:1245 vfs_mmap include/linux/fs.h:2405 [inline] mmap_file mm/internal.h:167 [inline] __mmap_new_file_vma mm/vma.c:2413 [inline] __mmap_new_vma mm/vma.c:2476 [inline] __mmap_region mm/vma.c:2670 [inline] mmap_region+0x18b4/0x2110 mm/vma.c:2740 do_mmap+0xc45/0x10d0 mm/mmap.c:558 vm_mmap_pgoff+0x2a6/0x4d0 mm/util.c:581 ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:604 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 ffff888077fb7400 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes to the right of allocated 136-byte region [ffff888077fb7400, ffff888077fb7488) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x77fb7 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88813ffa63c0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 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 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 8731, tgid 8728 (syz.0.509), ts 441711048685, free_ts 440379884430 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+0x2365/0x2440 mm/page_alloc.c:3884 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183 alloc_slab_page mm/slub.c:3041 [inline] allocate_slab+0x71/0x3a0 mm/slub.c:3212 new_slab mm/slub.c:3266 [inline] ___slab_alloc+0xe94/0x18a0 mm/slub.c:4636 __slab_alloc+0x65/0x100 mm/slub.c:4755 __slab_alloc_node mm/slub.c:4831 [inline] slab_alloc_node mm/slub.c:5253 [inline] __do_kmalloc_node mm/slub.c:5626 [inline] __kmalloc_node_noprof+0x5cc/0x800 mm/slub.c:5633 kmalloc_array_node_noprof include/linux/slab.h:1075 [inline] alloc_slab_obj_exts+0x3d/0xc0 mm/slub.c:2123 __memcg_slab_post_alloc_hook+0x31d/0x7d0 mm/memcontrol.c:3173 memcg_slab_post_alloc_hook mm/slub.c:2322 [inline] slab_post_alloc_hook mm/slub.c:4966 [inline] slab_alloc_node mm/slub.c:5265 [inline] kmem_cache_alloc_lru_noprof+0x410/0x6d0 mm/slub.c:5284 xas_alloc lib/xarray.c:378 [inline] xas_expand lib/xarray.c:590 [inline] xas_create+0x64f/0x1b90 lib/xarray.c:661 xas_store+0x95/0x1880 lib/xarray.c:795 __xa_alloc+0x142/0x220 lib/xarray.c:2005 xa_alloc include/linux/xarray.h:878 [inline] _iommufd_object_alloc+0x102/0x1b0 drivers/iommu/iommufd/main.c:56 iommufd_ioas_alloc drivers/iommu/iommufd/ioas.c:28 [inline] iommufd_ioas_alloc_ioctl+0xa9/0x380 drivers/iommu/iommufd/ioas.c:47 iommufd_fops_ioctl+0x45e/0x580 drivers/iommu/iommufd/main.c:533 page last free pid 23 tgid 23 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:2906 __tlb_remove_table_free mm/mmu_gather.c:227 [inline] tlb_remove_table_rcu+0x85/0x100 mm/mmu_gather.c:290 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0xcab/0x1770 kernel/rcu/tree.c:2861 handle_softirqs+0x286/0x870 kernel/softirq.c:622 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:1063 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888077fb7380: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ffff888077fb7400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888077fb7480: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888077fb7500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888077fb7580: 00 00 00 00 00 00 00 05 fc fc fc fc fc fc fc fc ==================================================================