================================================================== BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x9a/0xc0 lib/usercopy.c:27 Read of size 337 at addr ffff88019e067ffd by task syz-executor2/21450 CPU: 0 PID: 21450 Comm: syz-executor2 Not tainted 4.14.74+ #17 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 print_address_description+0x60/0x22b mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report.cold.6+0x11b/0x2dd mm/kasan/report.c:409 _copy_to_user+0x9a/0xc0 lib/usercopy.c:27 copy_to_user include/linux/uaccess.h:155 [inline] bpf_test_finish.isra.0+0xc8/0x190 net/bpf/test_run.c:59 bpf_prog_test_run_skb+0x4d0/0x8c0 net/bpf/test_run.c:144 bpf_prog_test_run kernel/bpf/syscall.c:1330 [inline] SYSC_bpf kernel/bpf/syscall.c:1602 [inline] SyS_bpf+0x79d/0x3640 kernel/bpf/syscall.c:1547 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457579 RSP: 002b:00007fd2c1890c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457579 RDX: 0000000000000028 RSI: 0000000020000180 RDI: 000000000000000a RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd2c18916d4 R13: 00000000004bd8a6 R14: 00000000004cc208 R15: 00000000ffffffff Allocated by task 20248: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc.part.1+0x4f/0xd0 mm/kasan/kasan.c:551 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc_node mm/slub.c:2723 [inline] slab_alloc mm/slub.c:2731 [inline] kmem_cache_alloc+0xe4/0x2b0 mm/slub.c:2736 getname_flags+0xc4/0x540 fs/namei.c:138 do_sys_open+0x1ea/0x580 fs/open.c:1065 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 20248: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xac/0x190 mm/kasan/kasan.c:524 slab_free_hook mm/slub.c:1389 [inline] slab_free_freelist_hook mm/slub.c:1410 [inline] slab_free mm/slub.c:2966 [inline] kmem_cache_free+0x12d/0x350 mm/slub.c:2988 putname+0xcf/0x100 fs/namei.c:259 do_sys_open+0x2bb/0x580 fs/open.c:1080 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff88019e066600 which belongs to the cache names_cache of size 4096 The buggy address is located 2557 bytes to the right of 4096-byte region [ffff88019e066600, ffff88019e067600) The buggy address belongs to the page: page:ffffea0006781800 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 flags: 0x4000000000008100(slab|head) raw: 4000000000008100 0000000000000000 0000000000000000 0000000100070007 raw: dead000000000100 dead000000000200 ffff8801da97e000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88019e067e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88019e067f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88019e067f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88019e068000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88019e068080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== kauditd_printk_skb: 219 callbacks suppressed audit: type=1400 audit(2000000001.780:3750): avc: denied { map } for pid=21465 comm="getty" path="/lib/x86_64-linux-gnu/libc-2.13.so" dev="sda1" ino=2784 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(2000000001.790:3751): avc: denied { map } for pid=21468 comm="getty" path="/etc/ld.so.cache" dev="sda1" ino=2503 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(2000000001.790:3752): avc: denied { map } for pid=21472 comm="getty" path="/sbin/getty" dev="sda1" ino=16170 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: audit_backlog=65 > audit_backlog_limit=64 audit: audit_lost=41 audit_rate_limit=0 audit_backlog_limit=64 audit: backlog limit exceeded audit: audit_backlog=65 > audit_backlog_limit=64 audit: audit_lost=42 audit_rate_limit=0 audit_backlog_limit=64 audit: backlog limit exceeded audit: audit_backlog=65 > audit_backlog_limit=64