On Tue, Apr 13, 2021 at 7:55 AM syzbot <syzbot+72ba979b6681c3369db4@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 3a229812 Merge tag 'arm-fixes-5.11-2' of git://git.kernel... > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=16b4d196d00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=f91155ccddaf919c > dashboard link: https://syzkaller.appspot.com/bug?extid=72ba979b6681c3369db4 > compiler: Debian clang version 11.0.1-2 > > Unfortunately, I don't have any reproducer for this issue yet. > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+72ba979b6681c3369db4@xxxxxxxxxxxxxxxxxxxxxxxxx Maybe related to: https://lore.kernel.org/lkml/0000000000005f397905ba42aea8@xxxxxxxxxx/ ? there are some uninits involved in reiserfs attrs. > loop3: detected capacity change from 0 to 65534 > ================================================================== > BUG: KASAN: slab-out-of-bounds in reiserfs_xattr_get+0xe0/0x590 fs/reiserfs/xattr.c:681 > Read of size 8 at addr ffff888028983198 by task syz-executor.3/4211 > > CPU: 1 PID: 4211 Comm: syz-executor.3 Not tainted 5.12.0-rc6-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:79 [inline] > dump_stack+0x176/0x24e lib/dump_stack.c:120 > print_address_description+0x5f/0x3a0 mm/kasan/report.c:232 > __kasan_report mm/kasan/report.c:399 [inline] > kasan_report+0x15c/0x200 mm/kasan/report.c:416 > reiserfs_xattr_get+0xe0/0x590 fs/reiserfs/xattr.c:681 > reiserfs_get_acl+0x63/0x670 fs/reiserfs/xattr_acl.c:211 > get_acl+0x152/0x2e0 fs/posix_acl.c:141 > check_acl fs/namei.c:294 [inline] > acl_permission_check fs/namei.c:339 [inline] > generic_permission+0x2ed/0x5b0 fs/namei.c:392 > do_inode_permission fs/namei.c:446 [inline] > inode_permission+0x28e/0x500 fs/namei.c:513 > may_open+0x228/0x3e0 fs/namei.c:2985 > do_open fs/namei.c:3365 [inline] > path_openat+0x2697/0x3860 fs/namei.c:3500 > do_filp_open+0x1a3/0x3b0 fs/namei.c:3527 > do_sys_openat2+0xba/0x380 fs/open.c:1187 > do_sys_open fs/open.c:1203 [inline] > __do_sys_openat fs/open.c:1219 [inline] > __se_sys_openat fs/open.c:1214 [inline] > __x64_sys_openat+0x1c8/0x1f0 fs/open.c:1214 > do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x419544 > Code: 84 00 00 00 00 00 44 89 54 24 0c e8 96 f9 ff ff 44 8b 54 24 0c 44 89 e2 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 89 44 24 0c e8 c8 f9 ff ff 8b 44 > RSP: 002b:00007fa357a03f30 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 > RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000419544 > RDX: 0000000000010000 RSI: 0000000020000100 RDI: 00000000ffffff9c > RBP: 0000000020000100 R08: 0000000000000000 R09: 0000000020000000 > R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000010000 > R13: 0000000020000100 R14: 00007fa357a04000 R15: 0000000020065600 > > Allocated by task 4210: > kasan_save_stack mm/kasan/common.c:38 [inline] > kasan_set_track mm/kasan/common.c:46 [inline] > set_alloc_info mm/kasan/common.c:427 [inline] > ____kasan_kmalloc+0xc2/0xf0 mm/kasan/common.c:506 > kasan_kmalloc include/linux/kasan.h:233 [inline] > kmem_cache_alloc_trace+0x21b/0x350 mm/slub.c:2934 > kmalloc include/linux/slab.h:554 [inline] > kzalloc include/linux/slab.h:684 [inline] > smk_fetch security/smack/smack_lsm.c:288 [inline] > smack_d_instantiate+0x65c/0xcc0 security/smack/smack_lsm.c:3411 > security_d_instantiate+0xa5/0x100 security/security.c:1987 > d_instantiate_new+0x61/0x110 fs/dcache.c:2025 > ext4_add_nondir+0x22b/0x290 fs/ext4/namei.c:2590 > ext4_symlink+0x8ce/0xe90 fs/ext4/namei.c:3417 > vfs_symlink+0x3a0/0x540 fs/namei.c:4178 > do_symlinkat+0x1c9/0x440 fs/namei.c:4208 > do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 > entry_SYSCALL_64_after_hwframe+0x44/0xae > > Freed by task 4210: > kasan_save_stack mm/kasan/common.c:38 [inline] > kasan_set_track+0x3d/0x70 mm/kasan/common.c:46 > kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:357 > ____kasan_slab_free+0x100/0x140 mm/kasan/common.c:360 > kasan_slab_free include/linux/kasan.h:199 [inline] > slab_free_hook mm/slub.c:1562 [inline] > slab_free_freelist_hook+0x171/0x270 mm/slub.c:1600 > slab_free mm/slub.c:3161 [inline] > kfree+0xcf/0x2d0 mm/slub.c:4213 > smk_fetch security/smack/smack_lsm.c:300 [inline] > smack_d_instantiate+0x6db/0xcc0 security/smack/smack_lsm.c:3411 > security_d_instantiate+0xa5/0x100 security/security.c:1987 > d_instantiate_new+0x61/0x110 fs/dcache.c:2025 > ext4_add_nondir+0x22b/0x290 fs/ext4/namei.c:2590 > ext4_symlink+0x8ce/0xe90 fs/ext4/namei.c:3417 > vfs_symlink+0x3a0/0x540 fs/namei.c:4178 > do_symlinkat+0x1c9/0x440 fs/namei.c:4208 > do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 > entry_SYSCALL_64_after_hwframe+0x44/0xae > > Last potentially related work creation: > kasan_save_stack+0x27/0x50 mm/kasan/common.c:38 > kasan_record_aux_stack+0xee/0x120 mm/kasan/generic.c:345 > __call_rcu kernel/rcu/tree.c:3039 [inline] > call_rcu+0x130/0x8e0 kernel/rcu/tree.c:3114 > fib6_info_release include/net/ip6_fib.h:337 [inline] > nsim_rt6_release drivers/net/netdevsim/fib.c:507 [inline] > nsim_fib6_event_fini+0x100/0x1f0 drivers/net/netdevsim/fib.c:833 > nsim_fib_event drivers/net/netdevsim/fib.c:885 [inline] > nsim_fib_event_work+0x3e0a/0x5480 drivers/net/netdevsim/fib.c:1368 > process_one_work+0x789/0xfd0 kernel/workqueue.c:2275 > process_scheduled_works kernel/workqueue.c:2337 [inline] > worker_thread+0xe28/0x1300 kernel/workqueue.c:2423 > kthread+0x39a/0x3c0 kernel/kthread.c:292 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 > > The buggy address belongs to the object at ffff888028983000 > which belongs to the cache kmalloc-256 of size 256 > The buggy address is located 152 bytes to the right of > 256-byte region [ffff888028983000, ffff888028983100) > The buggy address belongs to the page: > page:ffffea0000a26080 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28982 > head:ffffea0000a26080 order:1 compound_mapcount:0 > flags: 0xfff00000010200(slab|head) > raw: 00fff00000010200 ffffea00007fd400 0000000300000003 ffff888010841b40 > raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff888028983080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff888028983100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > >ffff888028983180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ^ > ffff888028983200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff888028983280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ================================================================== > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/000000000000a005ac05bfd4463d%40google.com.
