================================================================== 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 ffff8880272b4408 by task syz.4.5029/20818 CPU: 0 UID: 0 PID: 20818 Comm: syz.4.5029 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+0x199/0x1f0 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+0x2cf/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: 0033:0x7f66a678ebe9 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:00007f66a75b0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f66a69c6090 RCX: 00007f66a678ebe9 RDX: 0000200000000300 RSI: 00000000c00c642e RDI: 0000000000000006 RBP: 00007f66a6811e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f66a69c6128 R14: 00007f66a69c6090 R15: 00007ffe9925e518 Allocated by task 20818: 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+0x199/0x1f0 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+0x2cf/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 ffff8880272b4000 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 [ffff8880272b4000, ffff8880272b4408) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x272b0 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 ffffea000195e600 dead000000000002 raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801a842000 ffffea000195e600 dead000000000002 head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea00009cac01 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 12349, tgid 12349 (syz-executor), ts 597975238697, free_ts 594124589255 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] __kmalloc_cache_noprof+0x411/0x6f0 mm/slub.c:5392 kmalloc_noprof include/linux/slab.h:956 [inline] rtnl_newlink+0xed/0x1c70 net/core/rtnetlink.c:3957 rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6946 netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2552 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:729 __sys_sendto+0x3bd/0x520 net/socket.c:2228 __do_sys_sendto net/socket.c:2235 [inline] __se_sys_sendto net/socket.c:2231 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2231 page last free pid 12386 tgid 12386 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] __do_kmalloc_node mm/slub.c:5365 [inline] __kmalloc_noprof+0x3c3/0x7f0 mm/slub.c:5378 kmalloc_noprof include/linux/slab.h:960 [inline] load_elf_phdrs fs/binfmt_elf.c:540 [inline] load_elf_binary+0x326/0x2740 fs/binfmt_elf.c:869 search_binary_handler fs/exec.c:1670 [inline] exec_binprm fs/exec.c:1702 [inline] bprm_execve+0x999/0x1450 fs/exec.c:1754 do_execveat_common+0x510/0x6a0 fs/exec.c:1860 do_execve fs/exec.c:1934 [inline] __do_sys_execve fs/exec.c:2010 [inline] __se_sys_execve fs/exec.c:2005 [inline] __x64_sys_execve+0x94/0xb0 fs/exec.c:2005 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 Memory state around the buggy address: ffff8880272b4300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880272b4380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880272b4400: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880272b4480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880272b4500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================