================================================================== BUG: KASAN: use-after-free in xsk_diag_put_info net/xdp/xsk_diag.c:21 [inline] BUG: KASAN: use-after-free in xsk_diag_fill net/xdp/xsk_diag.c:114 [inline] BUG: KASAN: use-after-free in xsk_diag_dump+0x1452/0x1970 net/xdp/xsk_diag.c:163 Read of size 4 at addr ffff88807d77c0d8 by task syz-executor.2/23748 CPU: 1 PID: 23748 Comm: syz-executor.2 Not tainted 6.1.50-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:395 kasan_report+0x136/0x160 mm/kasan/report.c:495 xsk_diag_put_info net/xdp/xsk_diag.c:21 [inline] xsk_diag_fill net/xdp/xsk_diag.c:114 [inline] xsk_diag_dump+0x1452/0x1970 net/xdp/xsk_diag.c:163 netlink_dump+0x603/0xc50 net/netlink/af_netlink.c:2260 __netlink_dump_start+0x532/0x6f0 net/netlink/af_netlink.c:2365 netlink_dump_start include/linux/netlink.h:269 [inline] xsk_diag_handler_dump+0x1d5/0x260 net/xdp/xsk_diag.c:190 sock_diag_rcv_msg+0xd5/0x400 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2525 sock_diag_rcv+0x26/0x40 net/core/sock_diag.c:277 netlink_unicast_kernel net/netlink/af_netlink.c:1328 [inline] netlink_unicast+0x7bf/0x990 net/netlink/af_netlink.c:1354 netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1903 sock_sendmsg_nosec net/socket.c:716 [inline] sock_sendmsg net/socket.c:736 [inline] sock_write_iter+0x394/0x4e0 net/socket.c:1113 do_iter_write+0x6e6/0xc50 fs/read_write.c:861 vfs_writev fs/read_write.c:934 [inline] do_writev+0x27b/0x460 fs/read_write.c:977 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fef51c7cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fef507fe0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007fef51d9bf80 RCX: 00007fef51c7cae9 RDX: 0000000000000001 RSI: 0000000020000080 RDI: 0000000000000005 RBP: 00007fef51cc847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fef51d9bf80 R15: 00007fffdd90f7f8 Allocated by task 23273: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc+0xb2/0x230 mm/slab_common.c:968 kmalloc include/linux/slab.h:558 [inline] tomoyo_realpath_from_path+0xcb/0x5d0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x22c/0x490 security/tomoyo/file.c:771 security_file_open+0x5f/0xa0 security/security.c:1649 do_dentry_open+0x308/0x10f0 fs/open.c:869 do_open fs/namei.c:3557 [inline] path_openat+0x2644/0x2e60 fs/namei.c:3714 do_filp_open+0x230/0x480 fs/namei.c:3741 do_sys_openat2+0x13b/0x500 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1345 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 23273: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x25c/0x3c0 mm/slub.c:3674 tomoyo_realpath_from_path+0x59f/0x5d0 security/tomoyo/realpath.c:286 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x22c/0x490 security/tomoyo/file.c:771 security_file_open+0x5f/0xa0 security/security.c:1649 do_dentry_open+0x308/0x10f0 fs/open.c:869 do_open fs/namei.c:3557 [inline] path_openat+0x2644/0x2e60 fs/namei.c:3714 do_filp_open+0x230/0x480 fs/namei.c:3741 do_sys_openat2+0x13b/0x500 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1345 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88807d77c000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 216 bytes inside of 4096-byte region [ffff88807d77c000, ffff88807d77d000) The buggy address belongs to the physical page: page:ffffea0001f5de00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7d778 head:ffffea0001f5de00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001f5b000 dead000000000002 ffff888012442140 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 12603, tgid 12603 (syz-executor.2), ts 808901515903, free_ts 808858376761 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2533 prep_new_page mm/page_alloc.c:2540 [inline] get_page_from_freelist+0x32ed/0x3480 mm/page_alloc.c:4292 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5559 alloc_slab_page+0x6a/0x150 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xa71/0x1080 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc+0xa1/0x230 mm/slab_common.c:968 kmalloc include/linux/slab.h:558 [inline] tomoyo_realpath_from_path+0xcb/0x5d0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x273/0x6b0 security/tomoyo/file.c:822 tomoyo_path_symlink+0xda/0x110 security/tomoyo/tomoyo.c:199 security_path_symlink+0xd9/0x130 security/security.c:1184 do_symlinkat+0x129/0x600 fs/namei.c:4425 __do_sys_symlinkat fs/namei.c:4447 [inline] __se_sys_symlinkat fs/namei.c:4444 [inline] __x64_sys_symlinkat+0x95/0xa0 fs/namei.c:4444 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1460 [inline] free_pcp_prepare mm/page_alloc.c:1510 [inline] free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3388 free_unref_page+0x98/0x570 mm/page_alloc.c:3484 qlist_free_all+0x22/0x60 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x50/0x370 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x10c/0x2d0 mm/slub.c:3422 kmem_cache_zalloc include/linux/slab.h:679 [inline] jbd2_alloc_handle include/linux/jbd2.h:1591 [inline] new_handle fs/jbd2/transaction.c:476 [inline] jbd2__journal_start+0x144/0x5c0 fs/jbd2/transaction.c:503 __ext4_journal_start_sb+0x19b/0x410 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] __ext4_unlink+0x412/0xba0 fs/ext4/namei.c:3260 ext4_unlink+0x1d5/0x670 fs/ext4/namei.c:3319 vfs_unlink+0x359/0x5f0 fs/namei.c:4252 do_unlinkat+0x49d/0x940 fs/namei.c:4320 __do_sys_unlink fs/namei.c:4368 [inline] __se_sys_unlink fs/namei.c:4366 [inline] __x64_sys_unlink+0x45/0x50 fs/namei.c:4366 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88807d77bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807d77c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807d77c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807d77c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807d77c180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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