syzbot


KASAN: invalid-free in io_clean_op

Status: upstream: reported C repro on 2022/09/25 17:29
Reported-by: syzbot+edfd15cd4246a3fc615a@syzkaller.appspotmail.com
Fix commit: 4c17a496a7a0 io_uring/net: fix cleanup double free free_iov init
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386 ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-riscv64]
First crash: 70d, last: 53d
Patch testing requests:
Created Duration User Patch Repo Result
2022/09/26 13:51 16m asml.silence@gmail.com https://github.com/isilence/linux.git io_uring/net-free-iov-bug OK log
2022/09/25 17:55 11m asml.silence@gmail.com git://git.kernel.dk/linux.git for-6.1/io_uring report log

Sample crash report:
==================================================================
BUG: KASAN: double-free in slab_free mm/slub.c:3599 [inline]
BUG: KASAN: double-free in __kmem_cache_free+0xab/0x3b0 mm/slub.c:3612
Free of addr ffff88801e642000 by task syz-executor374/3609

CPU: 0 PID: 3609 Comm: syz-executor374 Not tainted 6.0.0-rc6-next-20220923-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:395
 kasan_report_invalid_free+0x97/0x1b0 mm/kasan/report.c:460
 ____kasan_slab_free+0x185/0x1c0 mm/kasan/common.c:225
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1669 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695
 slab_free mm/slub.c:3599 [inline]
 __kmem_cache_free+0xab/0x3b0 mm/slub.c:3612
 io_clean_op+0x581/0xb10 io_uring/io_uring.c:1699
 io_free_batch_list+0x46f/0x7e0 io_uring/io_uring.c:1305
 __io_submit_flush_completions+0x22b/0x2e0 io_uring/io_uring.c:1343
 io_submit_flush_completions io_uring/io_uring.c:171 [inline]
 ctx_flush_and_put+0xdf/0x1b0 io_uring/io_uring.c:1003
 tctx_task_work+0x153/0x4a0 io_uring/io_uring.c:1087
 task_work_run+0x16b/0x270 kernel/task_work.c:179
 ptrace_notify+0x114/0x140 kernel/signal.c:2354
 ptrace_report_syscall include/linux/ptrace.h:420 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:482 [inline]
 syscall_exit_work kernel/entry/common.c:251 [inline]
 syscall_exit_to_user_mode_prepare+0x129/0x280 kernel/entry/common.c:278
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x9/0x50 kernel/entry/common.c:296
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f10ee5d8bb9
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff7120f998 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: 00000000000040b2 RBX: 0000000000000003 RCX: 00007f10ee5d8bb9
RDX: 0000000000000000 RSI: 00000000000040b2 RDI: 0000000000000003
RBP: 00007f10ee59cd60 R08: 0000000020000000 R09: 0000000000000008
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f10ee59cdf0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Allocated by task 3609:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
 kasan_set_track+0x21/0x30 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:371 [inline]
 ____kasan_kmalloc mm/kasan/common.c:330 [inline]
 __kasan_kmalloc+0xa1/0xb0 mm/kasan/common.c:380
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:934 [inline]
 __kmalloc+0x54/0xc0 mm/slab_common.c:947
 kmalloc include/linux/slab.h:564 [inline]
 io_alloc_async_data+0x9b/0x160 io_uring/io_uring.c:1590
 io_msg_alloc_async io_uring/net.c:138 [inline]
 io_msg_alloc_async_prep io_uring/net.c:147 [inline]
 io_sendmsg_prep_async+0x19b/0x3c0 io_uring/net.c:221
 io_req_prep_async+0x1d9/0x300 io_uring/io_uring.c:1613
 io_submit_sqe io_uring/io_uring.c:2137 [inline]
 io_submit_sqes+0xfcd/0x1df0 io_uring/io_uring.c:2276
 __do_sys_io_uring_enter+0xac6/0x2410 io_uring/io_uring.c:3216
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 3609:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
 kasan_set_track+0x21/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1669 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695
 slab_free mm/slub.c:3599 [inline]
 __kmem_cache_free+0xab/0x3b0 mm/slub.c:3612
 io_send_zc_cleanup+0x133/0x180 io_uring/net.c:916
 io_clean_op+0xf4/0xb10 io_uring/io_uring.c:1684
 io_free_batch_list+0x46f/0x7e0 io_uring/io_uring.c:1305
 __io_submit_flush_completions+0x22b/0x2e0 io_uring/io_uring.c:1343
 io_submit_flush_completions io_uring/io_uring.c:171 [inline]
 ctx_flush_and_put+0xdf/0x1b0 io_uring/io_uring.c:1003
 tctx_task_work+0x153/0x4a0 io_uring/io_uring.c:1087
 task_work_run+0x16b/0x270 kernel/task_work.c:179
 ptrace_notify+0x114/0x140 kernel/signal.c:2354
 ptrace_report_syscall include/linux/ptrace.h:420 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:482 [inline]
 syscall_exit_work kernel/entry/common.c:251 [inline]
 syscall_exit_to_user_mode_prepare+0x129/0x280 kernel/entry/common.c:278
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x9/0x50 kernel/entry/common.c:296
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff88801e642000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
 512-byte region [ffff88801e642000, ffff88801e642200)

The buggy address belongs to the physical page:
page:ffffea0000799000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1e640
head:ffffea0000799000 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff888011841c80 dead000000100010 0000000000000000
raw: 0000000000000000 dead000000000001 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 7630490778, free_ts 0
 prep_new_page mm/page_alloc.c:2538 [inline]
 get_page_from_freelist+0x1092/0x2d20 mm/page_alloc.c:4287
 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5546
 alloc_page_interleave+0x1e/0x200 mm/mempolicy.c:2113
 alloc_pages+0x22f/0x270 mm/mempolicy.c:2275
 alloc_slab_page mm/slub.c:1739 [inline]
 allocate_slab+0x213/0x300 mm/slub.c:1884
 new_slab mm/slub.c:1937 [inline]
 ___slab_alloc+0xac1/0x1430 mm/slub.c:3119
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3217
 slab_alloc_node mm/slub.c:3302 [inline]
 __kmem_cache_alloc_node+0x18a/0x3d0 mm/slub.c:3375
 kmalloc_node_trace+0x1d/0x60 mm/slab_common.c:1027
 kmalloc_node include/linux/slab.h:581 [inline]
 kzalloc_node include/linux/slab.h:706 [inline]
 iolatency_pd_alloc+0xc1/0x1c0 block/blk-iolatency.c:961
 blkcg_activate_policy block/blk-cgroup.c:1425 [inline]
 blkcg_activate_policy+0x1e4/0xba0 block/blk-cgroup.c:1398
 blk_iolatency_init+0x290/0x5e0 block/blk-iolatency.c:777
 blkcg_init_queue+0x17d/0x620 block/blk-cgroup.c:1302
 __alloc_disk_node+0x29d/0x650 block/genhd.c:1366
 __blk_alloc_disk+0x35/0x90 block/genhd.c:1405
 brd_alloc.part.0+0x281/0x760 drivers/block/brd.c:391
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88801e641f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801e641f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801e642000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88801e642080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801e642100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (13):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-linux-next-kasan-gce-root 2022/09/25 17:11 linux-next aaa11ce2ffc8 0042f2b4 .config log report syz C KASAN: invalid-free in io_clean_op
ci-upstream-linux-next-kasan-gce-root 2022/10/12 22:40 linux-next aaa11ce2ffc8 89b5a509 .config log report info KASAN: invalid-free in io_clean_op
ci-upstream-linux-next-kasan-gce-root 2022/10/12 13:32 linux-next aaa11ce2ffc8 16a9c9e0 .config log report info KASAN: invalid-free in io_clean_op
ci-upstream-linux-next-kasan-gce-root 2022/10/10 01:22 linux-next aaa11ce2ffc8 aea5da89 .config log report info KASAN: invalid-free in io_clean_op
ci-upstream-linux-next-kasan-gce-root 2022/10/09 05:20 linux-next aaa11ce2ffc8 aea5da89 .config log report info KASAN: invalid-free in io_clean_op
ci-upstream-linux-next-kasan-gce-root 2022/10/09 05:20 linux-next aaa11ce2ffc8 aea5da89 .config log report info KASAN: invalid-free in io_clean_op
ci-upstream-linux-next-kasan-gce-root 2022/10/09 04:42 linux-next aaa11ce2ffc8 aea5da89 .config log report info KASAN: invalid-free in io_clean_op
ci-upstream-linux-next-kasan-gce-root 2022/10/08 23:58 linux-next aaa11ce2ffc8 aea5da89 .config log report info KASAN: invalid-free in io_clean_op
ci-upstream-linux-next-kasan-gce-root 2022/10/08 23:17 linux-next aaa11ce2ffc8 aea5da89 .config log report info KASAN: invalid-free in io_clean_op
ci-upstream-linux-next-kasan-gce-root 2022/10/08 16:02 linux-next aaa11ce2ffc8 aea5da89 .config log report info KASAN: invalid-free in io_clean_op
ci-upstream-linux-next-kasan-gce-root 2022/10/08 07:08 linux-next aaa11ce2ffc8 0de35f24 .config log report info KASAN: invalid-free in io_clean_op
ci-upstream-linux-next-kasan-gce-root 2022/10/01 23:41 linux-next aaa11ce2ffc8 feb56351 .config log report info KASAN: invalid-free in io_clean_op
ci-upstream-linux-next-kasan-gce-root 2022/09/25 16:57 linux-next aaa11ce2ffc8 0042f2b4 .config log report info KASAN: invalid-free in io_clean_op
* Struck through repros no longer work on HEAD.