random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) ================================================================== BUG: KASAN: slab-out-of-bounds in predicate_parse kernel/trace/trace_events_filter.c:557 [inline] BUG: KASAN: slab-out-of-bounds in process_preds+0x3ecf/0x4160 kernel/trace/trace_events_filter.c:1509 Write of size 4 at addr ffff8801cdbcdf70 by task syz-executor235/4508 CPU: 0 PID: 4508 Comm: syz-executor235 Not tainted 4.17.0+ #105 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 __asan_report_store4_noabort+0x17/0x20 mm/kasan/report.c:437 predicate_parse kernel/trace/trace_events_filter.c:557 [inline] process_preds+0x3ecf/0x4160 kernel/trace/trace_events_filter.c:1509 create_filter+0x167/0x280 kernel/trace/trace_events_filter.c:1717 ftrace_profile_set_filter+0x135/0x2f0 kernel/trace/trace_events_filter.c:2042 perf_event_set_filter+0x251/0x1260 kernel/events/core.c:9078 _perf_ioctl+0x865/0x1600 kernel/events/core.c:5059 perf_ioctl+0x59/0x80 kernel/events/core.c:5110 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:684 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:706 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x43fdb9 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 6b 45 00 00 c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc3e6e5df8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdb9 RDX: 0000000020000040 RSI: 0000000040082406 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004016e0 R13: 0000000000401770 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 19: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x780 mm/slab.c:3620 kmalloc include/linux/slab.h:513 [inline] call_modprobe kernel/kmod.c:80 [inline] __request_module+0x386/0xcdd kernel/kmod.c:171 snd_request_card+0x6b/0x80 sound/core/sound.c:75 snd_seq_client_use_ptr+0x3aa/0x3f0 sound/core/seq/seq_clientmgr.c:162 snd_seq_ioctl_query_next_client+0xd8/0x160 sound/core/seq/seq_clientmgr.c:2011 snd_seq_kernel_client_ctl+0x15a/0x190 sound/core/seq/seq_clientmgr.c:2360 snd_seq_oss_midi_lookup_ports+0xf6/0x270 sound/core/seq/oss/seq_oss_midi.c:90 async_call_lookup_ports+0x14/0x20 sound/core/seq/oss/seq_oss_init.c:67 process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153 worker_thread+0x189/0x13c0 kernel/workqueue.c:2296 kthread+0x345/0x410 kernel/kthread.c:240 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Freed by task 19: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 free_modprobe_argv+0x74/0xa0 kernel/kmod.c:67 call_usermodehelper_freeinfo kernel/umh.c:44 [inline] call_usermodehelper_exec+0x27a/0x500 kernel/umh.c:576 call_modprobe kernel/kmod.c:99 [inline] __request_module+0x4ba/0xcdd kernel/kmod.c:171 snd_request_card+0x6b/0x80 sound/core/sound.c:75 snd_seq_client_use_ptr+0x3aa/0x3f0 sound/core/seq/seq_clientmgr.c:162 snd_seq_ioctl_query_next_client+0xd8/0x160 sound/core/seq/seq_clientmgr.c:2011 snd_seq_kernel_client_ctl+0x15a/0x190 sound/core/seq/seq_clientmgr.c:2360 snd_seq_oss_midi_lookup_ports+0xf6/0x270 sound/core/seq/oss/seq_oss_midi.c:90 async_call_lookup_ports+0x14/0x20 sound/core/seq/oss/seq_oss_init.c:67 process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153 worker_thread+0x189/0x13c0 kernel/workqueue.c:2296 kthread+0x345/0x410 kernel/kthread.c:240 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 The buggy address belongs to the object at ffff8801cdbcdf00 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 48 bytes to the right of 64-byte region [ffff8801cdbcdf00, ffff8801cdbcdf40) The buggy address belongs to the page: page:ffffea000736f340 count:1 mapcount:0 mapping:ffff8801da800340 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea000739d308 ffffea0007353e48 ffff8801da800340 raw: 0000000000000000 ffff8801cdbcd000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801cdbcde00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8801cdbcde80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8801cdbcdf00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8801cdbcdf80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff8801cdbce000: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ==================================================================