audit: type=1400 audit(1600723809.458:8): avc: denied { execmem } for pid=6367 comm="syz-executor079" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 gfs2: fsid=loop0: Trying to join cluster "lock_nolock", "loop0" gfs2: fsid=loop0: Now mounting FS... ================================================================== BUG: KASAN: slab-out-of-bounds in gfs2_read_sb fs/gfs2/ops_fstype.c:332 [inline] BUG: KASAN: slab-out-of-bounds in init_sb+0xc60/0xd80 fs/gfs2/ops_fstype.c:488 Write of size 8 at addr ffff888097541bd0 by task syz-executor079/6367 CPU: 0 PID: 6367 Comm: syz-executor079 Not tainted 4.14.198-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_store8_noabort+0x68/0x70 mm/kasan/report.c:435 gfs2_read_sb fs/gfs2/ops_fstype.c:332 [inline] init_sb+0xc60/0xd80 fs/gfs2/ops_fstype.c:488 fill_super+0x15b0/0x2310 fs/gfs2/ops_fstype.c:1139 gfs2_mount+0x439/0x502 fs/gfs2/ops_fstype.c:1331 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0xe53/0x2a00 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x446dba RSP: 002b:00007fffe6cdf848 EFLAGS: 00000293 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fffe6cdf8a0 RCX: 0000000000446dba RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fffe6cdf860 RBP: 00007fffe6cdf860 R08: 00007fffe6cdf8a0 R09: 00007fff00000015 R10: 0000000002200000 R11: 0000000000000293 R12: 0000000000000001 R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 Allocated by task 6367: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 kmem_cache_alloc_trace+0x131/0x3d0 mm/slab.c:3618 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] init_sbd fs/gfs2/ops_fstype.c:71 [inline] fill_super+0xb7/0x2310 fs/gfs2/ops_fstype.c:1060 gfs2_mount+0x439/0x502 fs/gfs2/ops_fstype.c:1331 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0xe53/0x2a00 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff888097540800 which belongs to the cache kmalloc-8192 of size 8192 The buggy address is located 5072 bytes inside of 8192-byte region [ffff888097540800, ffff888097542800) The buggy address belongs to the page: page:ffffea00025d5000 count:1 mapcount:0 mapping:ffff888097540800 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffff888097540800 0000000000000000 0000000100000001 raw: ffffea00025def20 ffff88812fe51b48 ffff88812fe48080 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888097541a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888097541b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888097541b80: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ^ ffff888097541c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888097541c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================