random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) IPVS: ftp: loaded support on port[0] = 21 ================================================================== BUG: KASAN: slab-out-of-bounds in find_first_bit+0xf7/0x100 lib/find_bit.c:107 Read of size 8 at addr ffff8801d7145990 by task syz-executor004/4460 CPU: 0 PID: 4460 Comm: syz-executor004 Not tainted 4.18.0-rc3-next-20180706+ #1 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+0x242/0x30d mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 find_first_bit+0xf7/0x100 lib/find_bit.c:107 shrink_slab_memcg mm/vmscan.c:580 [inline] shrink_slab+0x5d0/0xdb0 mm/vmscan.c:672 shrink_node+0x429/0x16a0 mm/vmscan.c:2736 shrink_zones mm/vmscan.c:2965 [inline] do_try_to_free_pages+0x3e7/0x1290 mm/vmscan.c:3027 try_to_free_mem_cgroup_pages+0x49d/0xc90 mm/vmscan.c:3325 memory_high_write+0x283/0x310 mm/memcontrol.c:5597 cgroup_file_write+0x31f/0x840 kernel/cgroup/cgroup.c:3500 kernfs_fop_write+0x2ba/0x480 fs/kernfs/file.c:316 __vfs_write+0x117/0x9f0 fs/read_write.c:485 __kernel_write+0x10c/0x370 fs/read_write.c:506 write_pipe_buf+0x181/0x240 fs/splice.c:798 splice_from_pipe_feed fs/splice.c:503 [inline] __splice_from_pipe+0x38e/0x7c0 fs/splice.c:627 splice_from_pipe+0x1ea/0x340 fs/splice.c:662 default_file_splice_write+0x3c/0x90 fs/splice.c:810 do_splice_from fs/splice.c:852 [inline] direct_splice_actor+0x128/0x190 fs/splice.c:1019 splice_direct_to_actor+0x318/0x8f0 fs/splice.c:974 do_splice_direct+0x2d4/0x420 fs/splice.c:1062 do_sendfile+0x62a/0xe20 fs/read_write.c:1440 __do_sys_sendfile64 fs/read_write.c:1495 [inline] __se_sys_sendfile64 fs/read_write.c:1487 [inline] __x64_sys_sendfile64+0x15d/0x250 fs/read_write.c:1487 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4419e9 Code: e8 ec b5 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 7b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffdd9f42058 EFLAGS: 00000217 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004419e9 RDX: 0000000020000040 RSI: 0000000000000004 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000006 R09: 0000000000000006 R10: 0000000000000001 R11: 0000000000000217 R12: 0000000000000000 R13: 6c616b7a79732f2e R14: 0000000000000000 R15: 0000000000000000 Allocated by task 4459: 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:555 [inline] kvmalloc_node+0x65/0xf0 mm/util.c:423 kvmalloc include/linux/mm.h:557 [inline] kvzalloc include/linux/mm.h:565 [inline] memcg_alloc_shrinker_maps mm/memcontrol.c:386 [inline] mem_cgroup_css_online+0x169/0x3c0 mm/memcontrol.c:4685 online_css+0x10c/0x350 kernel/cgroup/cgroup.c:4768 css_create kernel/cgroup/cgroup.c:4839 [inline] cgroup_apply_control_enable+0x777/0xe90 kernel/cgroup/cgroup.c:2987 cgroup_mkdir+0x88a/0x1170 kernel/cgroup/cgroup.c:5029 kernfs_iop_mkdir+0x159/0x1e0 fs/kernfs/dir.c:1099 vfs_mkdir+0x42e/0x6b0 fs/namei.c:3874 do_mkdirat+0x27b/0x310 fs/namei.c:3897 __do_sys_mkdir fs/namei.c:3913 [inline] __se_sys_mkdir fs/namei.c:3911 [inline] __x64_sys_mkdir+0x5c/0x80 fs/namei.c:3911 do_syscall_64+0x1b9/0x820 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 acpi_os_free include/acpi/platform/aclinuxex.h:62 [inline] acpi_ex_stop_trace_method+0x1bf/0x1cb drivers/acpi/acpica/extrace.c:260 acpi_ds_terminate_control_method+0x5ab/0x5bc drivers/acpi/acpica/dsmethod.c:824 acpi_ps_parse_aml+0x4af/0x86a drivers/acpi/acpica/psparse.c:553 acpi_ps_execute_method+0x521/0x597 drivers/acpi/acpica/psxface.c:187 acpi_ns_evaluate+0x717/0x9bc drivers/acpi/acpica/nseval.c:204 acpi_evaluate_object+0x48c/0x8cf drivers/acpi/acpica/nsxfeval.c:354 acpi_evaluate_integer+0x129/0x280 drivers/acpi/utils.c:296 acpi_bus_get_status_handle+0x26/0xa0 drivers/acpi/bus.c:127 acpi_bus_type_and_status drivers/acpi/scan.c:1697 [inline] acpi_bus_check_add+0x3b5/0xb60 drivers/acpi/scan.c:1851 acpi_ns_walk_namespace+0x224/0x400 drivers/acpi/acpica/nswalk.c:237 acpi_walk_namespace+0xf2/0x12c drivers/acpi/acpica/nsxfeval.c:606 acpi_bus_scan+0x146/0x170 drivers/acpi/scan.c:2041 acpi_scan_init+0x403/0x8fe drivers/acpi/scan.c:2198 acpi_init+0x941/0xa19 drivers/acpi/bus.c:1284 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:415 The buggy address belongs to the object at ffff8801d7145980 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 16 bytes inside of 32-byte region [ffff8801d7145980, ffff8801d71459a0) The buggy address belongs to the page: page:ffffea00075c5140 count:1 mapcount:0 mapping:ffff8801da8001c0 index:0xffff8801d7145fc1 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea00075c37c8 ffffea00075c6808 ffff8801da8001c0 raw: ffff8801d7145fc1 ffff8801d7145000 000000010000003f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d7145880: 00 04 fc fc fc fc fc fc 00 03 fc fc fc fc fc fc ffff8801d7145900: 00 03 fc fc fc fc fc fc 00 00 00 fc fc fc fc fc >ffff8801d7145980: 00 00 05 fc fc fc fc fc 00 00 00 fc fc fc fc fc ^ ffff8801d7145a00: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc ffff8801d7145a80: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc ==================================================================