audit: type=1400 audit(1539487713.862:35): avc: denied { map } for pid=5487 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1539487720.562:36): avc: denied { map } for pid=5501 comm="syz-executor518" path="/root/syz-executor518795612" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 ================================================================== BUG: KASAN: slab-out-of-bounds in fscache_set_key fs/fscache/cookie.c:120 [inline] BUG: KASAN: slab-out-of-bounds in fscache_alloc_cookie+0x7ad/0x880 fs/fscache/cookie.c:171 Read of size 4 at addr ffff8801c7980c54 by task syz-executor518/5501 CPU: 1 PID: 5501 Comm: syz-executor518 Not tainted 4.19.0-rc7+ #61 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+0x1c4/0x2b4 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 fscache_set_key fs/fscache/cookie.c:120 [inline] fscache_alloc_cookie+0x7ad/0x880 fs/fscache/cookie.c:171 __fscache_acquire_cookie+0x230/0xb60 fs/fscache/cookie.c:303 fscache_acquire_cookie include/linux/fscache.h:338 [inline] nfs_fscache_get_client_cookie+0x463/0x600 fs/nfs/fscache.c:85 nfs_alloc_client+0x563/0x760 fs/nfs/client.c:188 nfs_get_client+0x8e8/0x14d0 fs/nfs/client.c:430 nfs_init_server+0x357/0x1010 fs/nfs/client.c:670 nfs_create_server+0x86/0x5f0 fs/nfs/client.c:954 nfs_try_mount+0x180/0xa80 fs/nfs/super.c:1884 nfs_fs_mount+0x17f8/0x2f1c fs/nfs/super.c:2695 mount_fs+0xae/0x31d fs/super.c:1261 vfs_kern_mount.part.35+0xdc/0x4f0 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2457 [inline] do_mount+0x581/0x31f0 fs/namespace.c:2787 ksys_mount+0x12d/0x140 fs/namespace.c:3003 __do_sys_mount fs/namespace.c:3017 [inline] __se_sys_mount fs/namespace.c:3014 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3014 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x440139 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fffe6ce4e78 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440139 RDX: 0000000020000180 RSI: 0000000020000140 RDI: 0000000020000040 RBP: 00000000006ca018 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000286 R12: 00000000004019c0 R13: 0000000000401a50 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 5501: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x14e/0x760 mm/slab.c:3727 kmalloc include/linux/slab.h:518 [inline] kzalloc include/linux/slab.h:707 [inline] fscache_set_key fs/fscache/cookie.c:101 [inline] fscache_alloc_cookie+0x6f7/0x880 fs/fscache/cookie.c:171 __fscache_acquire_cookie+0x230/0xb60 fs/fscache/cookie.c:303 fscache_acquire_cookie include/linux/fscache.h:338 [inline] nfs_fscache_get_client_cookie+0x463/0x600 fs/nfs/fscache.c:85 nfs_alloc_client+0x563/0x760 fs/nfs/client.c:188 nfs_get_client+0x8e8/0x14d0 fs/nfs/client.c:430 nfs_init_server+0x357/0x1010 fs/nfs/client.c:670 nfs_create_server+0x86/0x5f0 fs/nfs/client.c:954 nfs_try_mount+0x180/0xa80 fs/nfs/super.c:1884 nfs_fs_mount+0x17f8/0x2f1c fs/nfs/super.c:2695 mount_fs+0xae/0x31d fs/super.c:1261 vfs_kern_mount.part.35+0xdc/0x4f0 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2457 [inline] do_mount+0x581/0x31f0 fs/namespace.c:2787 ksys_mount+0x12d/0x140 fs/namespace.c:3003 __do_sys_mount fs/namespace.c:3017 [inline] __se_sys_mount fs/namespace.c:3014 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3014 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 3399: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3813 selinux_cred_free+0x51/0x80 security/selinux/hooks.c:3929 security_cred_free+0x4a/0x80 security/security.c:1006 put_cred_rcu+0x265/0x780 kernel/cred.c:117 __rcu_reclaim kernel/rcu/rcu.h:236 [inline] rcu_do_batch kernel/rcu/tree.c:2576 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2880 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2847 [inline] rcu_process_callbacks+0xf23/0x2670 kernel/rcu/tree.c:2864 __do_softirq+0x30b/0xad8 kernel/softirq.c:292 The buggy address belongs to the object at ffff8801c7980c40 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 20 bytes inside of 32-byte region [ffff8801c7980c40, ffff8801c7980c60) The buggy address belongs to the page: page:ffffea00071e6000 count:1 mapcount:0 mapping:ffff8801da8001c0 index:0xffff8801c7980fc1 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0006f2a8c8 ffffea0007058288 ffff8801da8001c0 raw: ffff8801c7980fc1 ffff8801c7980000 000000010000003e 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c7980b00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8801c7980b80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc >ffff8801c7980c00: fb fb fb fb fc fc fc fc 00 00 06 fc fc fc fc fc ^ ffff8801c7980c80: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc ffff8801c7980d00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================