================================================================== 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_addr+0x1d3/0x220 arch/x86/mm/pat/set_memory.c:306 Read of size 8 at addr ffff888037a9d408 by task syz.6.2492/14129 CPU: 1 UID: 0 PID: 14129 Comm: syz.6.2492 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 __cpa_addr arch/x86/mm/pat/set_memory.c:309 [inline] __cpa_addr+0x1d3/0x220 arch/x86/mm/pat/set_memory.c:306 cpa_flush+0xec/0x8a0 arch/x86/mm/pat/set_memory.c:449 change_page_attr_set_clr arch/x86/mm/pat/set_memory.c:2115 [inline] cpa_clear_pages_array arch/x86/mm/pat/set_memory.c:2144 [inline] set_pages_array_wb+0x238/0x280 arch/x86/mm/pat/set_memory.c:2572 drm_gem_shmem_put_pages_locked+0x27e/0x300 drivers/gpu/drm/drm_gem_shmem_helper.c:239 drm_gem_shmem_vm_close+0x63/0xc0 drivers/gpu/drm/drm_gem_shmem_helper.c:596 vma_close mm/internal.h:190 [inline] remove_vma+0x88/0x160 mm/vma.c:464 exit_mmap+0x50a/0xb90 mm/mmap.c:1305 __mmput+0x12a/0x410 kernel/fork.c:1133 mmput+0x62/0x70 kernel/fork.c:1156 exit_mm kernel/exit.c:582 [inline] do_exit+0x7c7/0x2bf0 kernel/exit.c:954 do_group_exit+0xd3/0x2a0 kernel/exit.c:1107 get_signal+0x2671/0x26d0 kernel/signal.c:3034 arch_do_signal_or_restart+0x8f/0x7c0 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x85/0x130 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x426/0xfa0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbaa2b8efc9 Code: Unable to access opcode bytes at 0x7fbaa2b8ef9f. RSP: 002b:00007fbaa3abf0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fbaa2de5fa8 RCX: 00007fbaa2b8efc9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fbaa2de5fa8 RBP: 00007fbaa2de5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbaa2de6038 R14: 00007fff59e8f710 R15: 00007fff59e8f7f8 Allocated by task 14129: kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:400 [inline] __kasan_kmalloc+0xaa/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+0x3a3/0x9c0 mm/slub.c:7081 kvmalloc_array_node_noprof include/linux/slab.h:1122 [inline] drm_gem_get_pages+0x144/0xa10 drivers/gpu/drm/drm_gem.c:647 drm_gem_shmem_get_pages_locked+0x1e6/0x490 drivers/gpu/drm/drm_gem_shmem_helper.c:200 drm_gem_shmem_mmap drivers/gpu/drm/drm_gem_shmem_helper.c:646 [inline] drm_gem_shmem_mmap+0xc9/0x550 drivers/gpu/drm/drm_gem_shmem_helper.c:620 drm_gem_mmap_obj+0x1b5/0x560 drivers/gpu/drm/drm_gem.c:1167 drm_gem_mmap+0x40b/0x620 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+0x1309/0x27a0 mm/vma.c:2670 mmap_region+0x1ab/0x3f0 mm/vma.c:2740 do_mmap+0xa3e/0x1210 mm/mmap.c:558 vm_mmap_pgoff+0x29e/0x470 mm/util.c:581 ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:604 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888037a9c000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 0 bytes to the right of allocated 5128-byte region [ffff888037a9c000, ffff888037a9d408) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x37a98 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 ffff88801b443180 ffffea0000f7ce00 0000000000000006 raw: 0000000000000000 0000000080020002 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b443180 ffffea0000f7ce00 0000000000000006 head: 0000000000000000 0000000080020002 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea0000dea601 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 0x528c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP), pid 13500, tgid 13499 (syz.9.2291), ts 429000198131, free_ts 423670703769 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1850 prep_new_page mm/page_alloc.c:1858 [inline] get_page_from_freelist+0x10a3/0x3a30 mm/page_alloc.c:3884 __alloc_frozen_pages_noprof+0x25f/0x2470 mm/page_alloc.c:5183 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:3039 [inline] allocate_slab mm/slub.c:3212 [inline] new_slab+0x24a/0x360 mm/slub.c:3266 ___slab_alloc+0xdc4/0x1ae0 mm/slub.c:4636 __slab_alloc.constprop.0+0x63/0x110 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] __kvmalloc_node_noprof+0x5aa/0x9c0 mm/slub.c:7081 kvmalloc_array_node_noprof include/linux/slab.h:1122 [inline] __ptr_ring_init_queue_alloc_noprof include/linux/ptr_ring.h:481 [inline] ptr_ring_init_noprof include/linux/ptr_ring.h:499 [inline] skb_array_init_noprof include/linux/skb_array.h:182 [inline] pfifo_fast_init+0x12a/0x3b0 net/sched/sch_generic.c:869 qdisc_create_dflt+0x125/0x490 net/sched/sch_generic.c:1019 mq_init+0x345/0x490 net/sched/sch_mq.c:90 qdisc_create_dflt+0x125/0x490 net/sched/sch_generic.c:1019 attach_default_qdiscs net/sched/sch_generic.c:1201 [inline] dev_activate+0xaae/0x12d0 net/sched/sch_generic.c:1255 __dev_open+0x432/0x7c0 net/core/dev.c:1691 __dev_change_flags+0x55d/0x720 net/core/dev.c:9637 netif_change_flags+0x8d/0x160 net/core/dev.c:9700 page last free pid 13233 tgid 13232 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1394 [inline] __free_frozen_pages+0x7df/0x1160 mm/page_alloc.c:2906 discard_slab mm/slub.c:3310 [inline] __put_partials+0x130/0x170 mm/slub.c:3857 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:352 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4955 [inline] slab_alloc_node mm/slub.c:5265 [inline] __do_kmalloc_node mm/slub.c:5626 [inline] __kvmalloc_node_noprof+0x35c/0x9c0 mm/slub.c:7081 kvmalloc_array_node_noprof include/linux/slab.h:1122 [inline] compute_postorder+0xf2/0x990 kernel/bpf/verifier.c:17995 bpf_check+0x6593/0xb710 kernel/bpf/verifier.c:24623 bpf_prog_load+0x112e/0x2850 kernel/bpf/syscall.c:3062 __sys_bpf+0x3e72/0x4980 kernel/bpf/syscall.c:6134 __do_sys_bpf kernel/bpf/syscall.c:6244 [inline] __se_sys_bpf kernel/bpf/syscall.c:6242 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:6242 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888037a9d300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888037a9d380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888037a9d400: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888037a9d480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888037a9d500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================