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 ffff8801cf890ff0 by task syz-executor831/4570 CPU: 1 PID: 4570 Comm: syz-executor831 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:00007ffe5d86d708 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 4553: 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 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3554 __split_vma+0x122/0x810 mm/mmap.c:2623 split_vma+0xa3/0xe0 mm/mmap.c:2686 mprotect_fixup+0x568/0x700 mm/mprotect.c:368 do_mprotect_pkey+0x5d2/0xa60 mm/mprotect.c:506 __do_sys_mprotect mm/mprotect.c:531 [inline] __se_sys_mprotect mm/mprotect.c:528 [inline] __x64_sys_mprotect+0x78/0xb0 mm/mprotect.c:528 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 4553: 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] kmem_cache_free+0x86/0x2d0 mm/slab.c:3756 remove_vma+0x164/0x1b0 mm/mmap.c:185 exit_mmap+0x365/0x5b0 mm/mmap.c:3116 __mmput kernel/fork.c:970 [inline] mmput+0x265/0x620 kernel/fork.c:991 exit_mm kernel/exit.c:544 [inline] do_exit+0xea9/0x2750 kernel/exit.c:852 do_group_exit+0x177/0x440 kernel/exit.c:968 __do_sys_exit_group kernel/exit.c:979 [inline] __se_sys_exit_group kernel/exit.c:977 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:977 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801cf890eb0 which belongs to the cache vm_area_struct of size 200 The buggy address is located 120 bytes to the right of 200-byte region [ffff8801cf890eb0, ffff8801cf890f78) The buggy address belongs to the page: page:ffffea00073e2400 count:1 mapcount:0 mapping:ffff8801da97b840 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0006a47108 ffffea00074058c8 ffff8801da97b840 raw: 0000000000000000 ffff8801cf890040 000000010000000f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801cf890e80: fc fc fc fc fc fc fb fb fb fb fb fb fb fb fb fb ffff8801cf890f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc >ffff8801cf890f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801cf891000: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff8801cf891080: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================