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:1509 Write of size 4 at addr ffff8801d2fb1a70 by task syz-executor336/4522 CPU: 0 PID: 4522 Comm: syz-executor336 Not tainted 4.17.0+ #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:1509 create_filter+0x155/0x270 kernel/trace/trace_events_filter.c:1717 ftrace_profile_set_filter+0x130/0x2e0 kernel/trace/trace_events_filter.c:2042 perf_event_set_filter+0x22e/0x1230 kernel/events/core.c:9078 _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/0x16f0 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: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:00007ffd8486fb38 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 4522: 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] allocate_probes kernel/tracepoint.c:65 [inline] func_add kernel/tracepoint.c:120 [inline] tracepoint_add_func kernel/tracepoint.c:208 [inline] tracepoint_probe_register_prio+0x7a2/0xa50 kernel/tracepoint.c:282 tracepoint_probe_register+0x2a/0x40 kernel/tracepoint.c:302 trace_event_reg+0x19a/0x350 kernel/trace/trace_events.c:305 perf_trace_event_reg kernel/trace/trace_event_perf.c:123 [inline] perf_trace_event_init+0x4fe/0x990 kernel/trace/trace_event_perf.c:198 perf_trace_init+0x186/0x250 kernel/trace/trace_event_perf.c:222 perf_tp_event_init+0xa6/0x120 kernel/events/core.c:8339 perf_try_init_event+0x137/0x2f0 kernel/events/core.c:9733 perf_init_event kernel/events/core.c:9771 [inline] perf_event_alloc.part.93+0x1248/0x3090 kernel/events/core.c:10037 perf_event_alloc kernel/events/core.c:10393 [inline] __do_sys_perf_event_open+0xa8c/0x30c0 kernel/events/core.c:10494 __se_sys_perf_event_open kernel/events/core.c:10383 [inline] __x64_sys_perf_event_open+0xbe/0x150 kernel/events/core.c:10383 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe 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:442 __vunmap+0x326/0x460 mm/vmalloc.c:1529 vfree+0x68/0x100 mm/vmalloc.c:1593 free_partitions block/partitions/check.c:138 [inline] check_partition+0x4d6/0x6ad block/partitions/check.c:196 rescan_partitions+0x172/0x910 block/partition-generic.c:521 __blkdev_get+0xb67/0x13a0 fs/block_dev.c:1506 blkdev_get+0xb9/0xb30 fs/block_dev.c:1613 register_disk block/genhd.c:624 [inline] __device_add_disk+0xdfa/0x1340 block/genhd.c:701 device_add_disk+0x22/0x30 block/genhd.c:717 add_disk include/linux/genhd.h:399 [inline] brd_init+0x27b/0x379 drivers/block/brd.c:507 do_one_initcall+0x127/0x913 init/main.c:884 do_initcall_level init/main.c:952 [inline] do_initcalls init/main.c:960 [inline] do_basic_setup init/main.c:978 [inline] kernel_init_freeable+0x49b/0x58e init/main.c:1135 kernel_init+0x11/0x1b3 init/main.c:1061 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 The buggy address belongs to the object at ffff8801d2fb1a00 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 48 bytes to the right of 64-byte region [ffff8801d2fb1a00, ffff8801d2fb1a40) The buggy address belongs to the page: page:ffffea00074bec40 count:1 mapcount:0 mapping:ffff8801da800340 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea00074b99c8 ffffea00074a2608 ffff8801da800340 raw: 0000000000000000 ffff8801d2fb1000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d2fb1900: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff8801d2fb1980: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc >ffff8801d2fb1a00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff8801d2fb1a80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff8801d2fb1b00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================