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:1508 Write of size 4 at addr ffff8801cae83070 by task syz-executor935/4488 CPU: 1 PID: 4488 Comm: syz-executor935 Not tainted 4.17.0-rc4+ #16 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:1508 create_filter+0x155/0x270 kernel/trace/trace_events_filter.c:1716 ftrace_profile_set_filter+0x130/0x2e0 kernel/trace/trace_events_filter.c:2041 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:00007ffe7612a838 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdb9 RDX: 00000000200000c0 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 2419: 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 mm/slab.c:3718 [inline] __kmalloc+0x14e/0x760 mm/slab.c:3727 kmalloc include/linux/slab.h:517 [inline] kzalloc include/linux/slab.h:701 [inline] kobject_get_path+0xc2/0x1a0 lib/kobject.c:152 kobject_uevent_env+0x234/0x1110 lib/kobject_uevent.c:519 kobject_synth_uevent+0xa4f/0xc0b lib/kobject_uevent.c:208 uevent_store+0x26/0x70 drivers/base/core.c:993 dev_attr_store+0x5e/0x90 drivers/base/core.c:713 sysfs_kf_write+0x118/0x170 fs/sysfs/file.c:139 kernfs_fop_write+0x2ba/0x480 fs/kernfs/file.c:316 __vfs_write+0x10b/0x960 fs/read_write.c:485 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0xf9/0x250 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 2419: 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 kobject_uevent_env+0x275/0x1110 lib/kobject_uevent.c:619 kobject_synth_uevent+0xa4f/0xc0b lib/kobject_uevent.c:208 uevent_store+0x26/0x70 drivers/base/core.c:993 dev_attr_store+0x5e/0x90 drivers/base/core.c:713 sysfs_kf_write+0x118/0x170 fs/sysfs/file.c:139 kernfs_fop_write+0x2ba/0x480 fs/kernfs/file.c:316 __vfs_write+0x10b/0x960 fs/read_write.c:485 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0xf9/0x250 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801cae83000 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 48 bytes to the right of 64-byte region [ffff8801cae83000, ffff8801cae83040) The buggy address belongs to the page: page:ffffea00072ba0c0 count:1 mapcount:0 mapping:ffff8801cae83000 index:0xffff8801cae83e80 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801cae83000 ffff8801cae83e80 0000000100000009 raw: ffffea00073caae0 ffff8801da801338 ffff8801da800340 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801cae82f00: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc ffff8801cae82f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801cae83000: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8801cae83080: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff8801cae83100: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================