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+0x191f/0x19d0 kernel/trace/trace_events_filter.c:1505 Write of size 4 at addr ffff8801d3cac670 by task syz-executor702/4515 CPU: 1 PID: 4515 Comm: syz-executor702 Not tainted 4.17.0-rc4+ #39 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+0x1b9/0x294 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+0x191f/0x19d0 kernel/trace/trace_events_filter.c:1505 create_filter+0x155/0x270 kernel/trace/trace_events_filter.c:1713 ftrace_profile_set_filter+0x130/0x2e0 kernel/trace/trace_events_filter.c:2038 perf_event_set_filter+0x248/0x1230 kernel/events/core.c:9079 _perf_ioctl+0x84c/0x15e0 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+0x1cf/0x16a0 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+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x43fdb9 RSP: 002b:00007ffec56660a8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdb9 RDX: 0000000020000200 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 1: 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:512 [inline] __kthread_create_on_node+0x127/0x4c0 kernel/kthread.c:283 kthread_create_on_node+0xa8/0xd0 kernel/kthread.c:365 kswapd_run+0xa4/0x1b0 mm/vmscan.c:3735 kswapd_init+0x56/0xbd mm/vmscan.c:3766 do_one_initcall+0x127/0x913 init/main.c:883 do_initcall_level init/main.c:951 [inline] do_initcalls init/main.c:959 [inline] do_basic_setup init/main.c:977 [inline] kernel_init_freeable+0x49b/0x58e init/main.c:1127 kernel_init+0x11/0x1b3 init/main.c:1053 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Freed by task 1: 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 __kthread_create_on_node+0x34a/0x4c0 kernel/kthread.c:329 kthread_create_on_node+0xa8/0xd0 kernel/kthread.c:365 kswapd_run+0xa4/0x1b0 mm/vmscan.c:3735 kswapd_init+0x56/0xbd mm/vmscan.c:3766 do_one_initcall+0x127/0x913 init/main.c:883 do_initcall_level init/main.c:951 [inline] do_initcalls init/main.c:959 [inline] do_basic_setup init/main.c:977 [inline] kernel_init_freeable+0x49b/0x58e init/main.c:1127 kernel_init+0x11/0x1b3 init/main.c:1053 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 The buggy address belongs to the object at ffff8801d3cac600 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 48 bytes to the right of 64-byte region [ffff8801d3cac600, ffff8801d3cac640) The buggy address belongs to the page: page:ffffea00074f2b00 count:1 mapcount:0 mapping:ffff8801d3cac000 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801d3cac000 0000000000000000 0000000100000020 raw: ffffea0007375660 ffffea0007379360 ffff8801da800340 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d3cac500: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff8801d3cac580: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff8801d3cac600: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8801d3cac680: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff8801d3cac700: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================