================================================================== 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:5897 [inline] BUG: KASAN: use-after-free in perf_output_read+0x1046/0x1090 kernel/events/core.c:5932 Read of size 8 at addr ffff88809e920ae0 by task syz-executor.0/9639 CPU: 1 PID: 9639 Comm: syz-executor.0 Not tainted 4.14.261-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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:5897 [inline] perf_output_read+0x1046/0x1090 kernel/events/core.c:5932 perf_output_sample+0xa28/0x16f0 kernel/events/core.c:5974 __perf_event_output kernel/events/core.c:6287 [inline] perf_event_output_forward+0xf8/0x1f0 kernel/events/core.c:6300 __perf_event_overflow+0x113/0x310 kernel/events/core.c:7549 perf_swevent_overflow kernel/events/core.c:7625 [inline] perf_swevent_event+0x299/0x460 kernel/events/core.c:7653 do_perf_sw_event kernel/events/core.c:7766 [inline] ___perf_sw_event+0x2a1/0x480 kernel/events/core.c:7797 __perf_sw_event+0x4f/0x100 kernel/events/core.c:7809 perf_sw_event include/linux/perf_event.h:1046 [inline] __do_page_fault+0x692/0xad0 arch/x86/mm/fault.c:1483 page_fault+0x25/0x50 arch/x86/entry/entry_64.S:1123 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:181 RSP: 0018:ffff8880548efa60 EFLAGS: 00050206 RAX: ffffed100a861000 RBX: 0000000000008000 RCX: 0000000000003acb RDX: 0000000000008000 RSI: 0000000020f5a000 RDI: ffff888054304535 RBP: 0000000020f55acb R08: 0000000000000001 R09: ffffed100a860fff R10: ffff888054307fff R11: 0000000000000000 R12: ffff888054300000 R13: 00007ffffffff000 R14: 0000000020f5dacb R15: ffff88809d9a0cc0 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:608 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+0x46/0xbb RIP: 0033:0x7f6b170f9e99 RSP: 002b:00007f6b15a6f168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f6b1720cf60 RCX: 00007f6b170f9e99 RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000010 RBP: 00007f6b17153ff1 R08: 0000000000000000 R09: 0000000000000053 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffeb27f844f R14: 00007f6b15a6f300 R15: 0000000000022000 Allocated by task 9641: 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 mm/slab.c:3720 [inline] __kmalloc+0x15a/0x400 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] load_elf_phdrs+0x108/0x190 fs/binfmt_elf.c:431 load_elf_binary+0x2e1/0x4750 fs/binfmt_elf.c:724 search_binary_handler.part.0+0xd5/0x640 fs/exec.c:1653 search_binary_handler fs/exec.c:1642 [inline] exec_binprm fs/exec.c:1695 [inline] do_execveat_common+0x1099/0x1f30 fs/exec.c:1815 do_execve+0x33/0x50 fs/exec.c:1860 call_usermodehelper_exec_async+0x2ed/0x510 kernel/umh.c:109 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Freed by task 9641: 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 load_elf_binary+0x1c25/0x4750 fs/binfmt_elf.c:1097 search_binary_handler.part.0+0xd5/0x640 fs/exec.c:1653 search_binary_handler fs/exec.c:1642 [inline] exec_binprm fs/exec.c:1695 [inline] do_execveat_common+0x1099/0x1f30 fs/exec.c:1815 do_execve+0x33/0x50 fs/exec.c:1860 call_usermodehelper_exec_async+0x2ed/0x510 kernel/umh.c:109 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 The buggy address belongs to the object at ffff88809e920a80 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 96 bytes inside of 512-byte region [ffff88809e920a80, ffff88809e920c80) The buggy address belongs to the page: page:ffffea00027a4800 count:1 mapcount:0 mapping:ffff88809e920080 index:0x0 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffff88809e920080 0000000000000000 0000000100000006 raw: ffffea0002d40ce0 ffffea00025ced20 ffff88813fe74940 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809e920980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809e920a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88809e920a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809e920b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809e920b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================