audit: type=1800 audit(1670956338.974:9): pid=10346 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="bus" dev="loop1" ino=21 res=0 ================================================================== BUG: KASAN: use-after-free in primary_event_id kernel/events/core.c:1316 [inline] BUG: KASAN: use-after-free in perf_output_read_group kernel/events/core.c:5896 [inline] BUG: KASAN: use-after-free in perf_output_read+0x1046/0x1090 kernel/events/core.c:5931 Read of size 8 at addr ffff8880aa8f6d60 by task syz-executor.2/10335 CPU: 0 PID: 10335 Comm: syz-executor.2 Not tainted 4.14.301-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 primary_event_id kernel/events/core.c:1316 [inline] perf_output_read_group kernel/events/core.c:5896 [inline] perf_output_read+0x1046/0x1090 kernel/events/core.c:5931 perf_output_sample+0xa28/0x1700 kernel/events/core.c:5973 __perf_event_output kernel/events/core.c:6292 [inline] perf_event_output_forward+0xf8/0x1f0 kernel/events/core.c:6305 __perf_event_overflow+0x113/0x310 kernel/events/core.c:7554 perf_swevent_overflow kernel/events/core.c:7630 [inline] perf_swevent_event+0x299/0x460 kernel/events/core.c:7658 do_perf_sw_event kernel/events/core.c:7771 [inline] ___perf_sw_event+0x2ac/0x490 kernel/events/core.c:7802 __perf_sw_event+0x4f/0x100 kernel/events/core.c:7814 perf_sw_event include/linux/perf_event.h:1048 [inline] __do_page_fault+0x692/0xad0 arch/x86/mm/fault.c:1483 page_fault+0x25/0x50 arch/x86/entry/entry_64.S:1126 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:181 RSP: 0018:ffff888091d2fa60 EFLAGS: 00050202 RAX: ffffed101265f000 RBX: 0000000000003d29 RCX: 0000000000001acb RDX: 0000000000003d29 RSI: 0000000020fd4000 RDI: ffff8880932f6535 RBP: 0000000020fd1da2 R08: 0000000000000001 R09: ffffed101265efff R10: ffff8880932f7fff R11: 0000000000000000 R12: ffff8880932f42d7 R13: 00007ffffffff000 R14: 0000000020fd5acb R15: ffff8880b34b4d80 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:55 [inline] copyin+0x99/0xc0 lib/iov_iter.c:146 _copy_from_iter_full+0x19c/0x760 lib/iov_iter.c:610 copy_from_iter_full include/linux/uio.h:126 [inline] skb_do_copy_data_nocache include/net/sock.h:1892 [inline] skb_copy_to_page_nocache include/net/sock.h:1918 [inline] tcp_sendmsg_locked+0x23fc/0x2ef0 net/ipv4/tcp.c:1360 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1457 inet_sendmsg+0x11a/0x4e0 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 SYSC_sendto net/socket.c:1763 [inline] SyS_sendto+0x1c7/0x2c0 net/socket.c:1731 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 RIP: 0033:0x7f67baaea0d9 RSP: 002b:00007f67b905c168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f67bac09f80 RCX: 00007f67baaea0d9 RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000007 RBP: 00007f67bab45ae9 R08: 0000000000000000 R09: 0000000000000053 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdd1a9e7df R14: 00007f67b905c300 R15: 0000000000022000 Allocated by task 8046: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3696 __kmalloc_reserve net/core/skbuff.c:137 [inline] __alloc_skb+0x96/0x510 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:980 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1168 [inline] netlink_sendmsg+0x91e/0xbc0 net/netlink/af_netlink.c:1868 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 SYSC_sendto net/socket.c:1763 [inline] SyS_sendto+0x1c7/0x2c0 net/socket.c:1731 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 Freed by task 8046: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 skb_free_head net/core/skbuff.c:563 [inline] skb_release_data+0x5f6/0x820 net/core/skbuff.c:583 skb_release_all net/core/skbuff.c:640 [inline] __kfree_skb net/core/skbuff.c:654 [inline] consume_skb+0xe0/0x380 net/core/skbuff.c:714 netlink_unicast_kernel net/netlink/af_netlink.c:1297 [inline] netlink_unicast+0x43f/0x610 net/netlink/af_netlink.c:1322 netlink_sendmsg+0x648/0xbc0 net/netlink/af_netlink.c:1893 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 SYSC_sendto net/socket.c:1763 [inline] SyS_sendto+0x1c7/0x2c0 net/socket.c:1731 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 The buggy address belongs to the object at ffff8880aa8f6d00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 96 bytes inside of 512-byte region [ffff8880aa8f6d00, ffff8880aa8f6f00) The buggy address belongs to the page: page:ffffea0002aa3d80 count:1 mapcount:0 mapping:ffff8880aa8f6080 index:0xffff8880aa8f6080 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffff8880aa8f6080 ffff8880aa8f6080 0000000100000001 raw: ffffea0002ac6be0 ffffea0002b9ef20 ffff88813fe74940 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880aa8f6c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880aa8f6c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880aa8f6d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880aa8f6d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880aa8f6e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================