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+0x1958/0x19b0 kernel/trace/trace_events_filter.c:1505 Write of size 4 at addr ffff8801cd9d34f0 by task syz-executor894/4375 CPU: 0 PID: 4375 Comm: syz-executor894 Not tainted 4.17.0-rc2+ #21 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+0x1958/0x19b0 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:00007ffe3c7ea938 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdb9 RDX: 0000000020000000 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 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node+0x47/0x70 mm/slab.c:3689 kmalloc_node include/linux/slab.h:554 [inline] kvmalloc_node+0x6b/0x100 mm/util.c:421 kvmalloc include/linux/mm.h:550 [inline] kvzalloc include/linux/mm.h:558 [inline] allocate_hook_entries_size+0x44/0x90 net/netfilter/core.c:60 nf_hook_entries_grow net/netfilter/core.c:127 [inline] __nf_register_net_hook+0x8bc/0xc60 net/netfilter/core.c:319 nf_register_net_hook+0x62/0x100 net/netfilter/core.c:435 nf_register_net_hooks+0x68/0xe0 net/netfilter/core.c:451 ip6t_register_table+0x2c7/0x3b0 net/ipv6/netfilter/ip6_tables.c:1797 ip6table_mangle_table_init.part.1+0x49/0x70 net/ipv6/netfilter/ip6table_mangle.c:93 ip6table_mangle_table_init net/ipv6/netfilter/ip6table_mangle.c:87 [inline] ip6table_mangle_init+0xc0/0xf6 net/ipv6/netfilter/ip6table_mangle.c:126 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 kvfree+0x61/0x70 mm/util.c:440 __nf_hook_entries_free+0x31/0x40 net/netfilter/core.c:71 __rcu_reclaim kernel/rcu/rcu.h:178 [inline] rcu_do_batch kernel/rcu/tree.c:2675 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2930 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2897 [inline] rcu_process_callbacks+0x941/0x15f0 kernel/rcu/tree.c:2914 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:285 The buggy address belongs to the object at ffff8801cd9d3480 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 48 bytes to the right of 64-byte region [ffff8801cd9d3480, ffff8801cd9d34c0) The buggy address belongs to the page: page:ffffea00073674c0 count:1 mapcount:0 mapping:ffff8801cd9d3000 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801cd9d3000 0000000000000000 0000000100000020 raw: ffffea00073758a0 ffffea000736e520 ffff8801da800340 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801cd9d3380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8801cd9d3400: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8801cd9d3480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8801cd9d3500: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff8801cd9d3580: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================