[v5.15] KASAN: use-after-free Read in sock_def_write_space

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 5c6a716301d9 Linux 5.15.122
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1467ed06a80000
kernel config: https://syzkaller.appspot.com/x/.config?x=616b77968d97faf
dashboard link: https://syzkaller.appspot.com/bug?extid=510baeb4e47cc9a4f59a
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3b30110d1623/disk-5c6a7163.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ba1423987c1b/vmlinux-5c6a7163.xz
kernel image: https://storage.googleapis.com/syzbot-assets/57bc384b5a07/Image-5c6a7163.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+510bae...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in list_empty include/linux/list.h:290 [inline]
BUG: KASAN: use-after-free in waitqueue_active include/linux/wait.h:129 [inline]
BUG: KASAN: use-after-free in wq_has_sleeper include/linux/wait.h:163 [inline]
BUG: KASAN: use-after-free in skwq_has_sleeper include/net/sock.h:2270 [inline]
BUG: KASAN: use-after-free in sock_def_write_space+0x18c/0x394 net/core/sock.c:3086
Read of size 8 at addr ffff0000fe04f880 by task ksoftirqd/0/14

CPU: 0 PID: 14 Comm: ksoftirqd/0 Not tainted 5.15.122-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
Call trace:
dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0x174/0x1e4 mm/kasan/report.c:451
__asan_report_load8_noabort+0x44/0x50 mm/kasan/report_generic.c:309
list_empty include/linux/list.h:290 [inline]
waitqueue_active include/linux/wait.h:129 [inline]
wq_has_sleeper include/linux/wait.h:163 [inline]
skwq_has_sleeper include/net/sock.h:2270 [inline]
sock_def_write_space+0x18c/0x394 net/core/sock.c:3086
sock_wfree+0x110/0x230 net/core/sock.c:2205
skb_release_head_state+0x108/0x2a0 net/core/skbuff.c:729
skb_release_all net/core/skbuff.c:740 [inline]
__kfree_skb net/core/skbuff.c:756 [inline]
consume_skb+0x10c/0x40c net/core/skbuff.c:914
__dev_kfree_skb_any+0xc8/0xf4 net/core/dev.c:3121
dev_consume_skb_any include/linux/netdevice.h:4020 [inline]
gve_clean_tx_done+0x26c/0xce8 drivers/net/ethernet/google/gve/gve_tx.c:639
gve_tx_poll+0x15c/0x214 drivers/net/ethernet/google/gve/gve_tx.c:701
gve_napi_poll+0x7c/0x27c drivers/net/ethernet/google/gve/gve_main.c:203
__napi_poll+0xb4/0x624 net/core/dev.c:7012
napi_poll net/core/dev.c:7079 [inline]
net_rx_action+0x500/0xc10 net/core/dev.c:7166
__do_softirq+0x344/0xe20 kernel/softirq.c:558
do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
invoke_softirq kernel/softirq.c:439 [inline]
__irq_exit_rcu+0x28c/0x534 kernel/softirq.c:636
irq_exit+0x14/0x88 kernel/softirq.c:660
handle_domain_irq+0xf4/0x178 kernel/irq/irqdesc.c:710
gic_handle_irq+0x78/0x1c8 drivers/irqchip/irq-gic-v3.c:758
call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:899
do_interrupt_handler+0x74/0x94 arch/arm64/kernel/entry-common.c:267
el1_interrupt+0x30/0x58 arch/arm64/kernel/entry-common.c:442
el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:458
el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:580
arch_local_irq_enable arch/arm64/include/asm/irqflags.h:35 [inline]
ksoftirqd_run_end kernel/softirq.c:412 [inline]
run_ksoftirqd+0x74/0x258 kernel/softirq.c:921
smpboot_thread_fn+0x4b0/0x920 kernel/smpboot.c:164
kthread+0x37c/0x45c kernel/kthread.c:319
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870

Allocated by task 15931:
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:434 [inline]
__kasan_slab_alloc+0x8c/0xcc mm/kasan/common.c:467
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x74/0x3f4 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0x1dc/0x45c mm/slub.c:3233
sock_alloc_inode+0x24/0xc4 net/socket.c:303
alloc_inode fs/inode.c:236 [inline]
new_inode_pseudo+0x68/0x200 fs/inode.c:937
sock_alloc net/socket.c:626 [inline]
__sock_create+0x134/0x884 net/socket.c:1431
sock_create net/socket.c:1518 [inline]
__sys_socket+0x168/0x310 net/socket.c:1560
__do_sys_socket net/socket.c:1569 [inline]
__se_sys_socket net/socket.c:1567 [inline]
__arm64_sys_socket+0x7c/0x94 net/socket.c:1567
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Freed by task 20:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4c/0x84 mm/kasan/common.c:46
kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360
____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366
__kasan_slab_free+0x18/0x28 mm/kasan/common.c:374
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1705 [inline]
slab_free_freelist_hook+0x128/0x1ec mm/slub.c:1731
slab_free mm/slub.c:3499 [inline]
kmem_cache_free+0xdc/0x3c4 mm/slub.c:3515
sock_free_inode+0x28/0x38 net/socket.c:324
i_callback+0x50/0x78 fs/inode.c:225
rcu_do_batch kernel/rcu/tree.c:2510 [inline]
rcu_core+0x830/0x1b34 kernel/rcu/tree.c:2750
rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2763
__do_softirq+0x344/0xe20 kernel/softirq.c:558

Last potentially related work creation:
kasan_save_stack+0x38/0x68 mm/kasan/common.c:38
kasan_record_aux_stack+0xd4/0x11c mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:2994 [inline]
call_rcu+0x118/0xb40 kernel/rcu/tree.c:3074
destroy_inode fs/inode.c:291 [inline]
evict+0x5fc/0x68c fs/inode.c:602
iput_final fs/inode.c:1705 [inline]
iput+0x744/0x824 fs/inode.c:1731
dentry_unlink_inode+0x370/0x4b0 fs/dcache.c:376
__dentry_kill+0x324/0x5e4 fs/dcache.c:582
dentry_kill+0xc8/0x250
dput+0x21c/0x458 fs/dcache.c:888
__fput+0x500/0x7f0 fs/file_table.c:288
____fput+0x20/0x30 fs/file_table.c:308
task_work_run+0x130/0x1e4 kernel/task_work.c:164
get_signal+0x1450/0x1550 kernel/signal.c:2661
do_signal arch/arm64/kernel/signal.c:890 [inline]
do_notify_resume+0x3d0/0x32b8 arch/arm64/kernel/signal.c:943
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline]
el0_svc+0xfc/0x1f0 arch/arm64/kernel/entry-common.c:597
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Second to last potentially related work creation:
kasan_save_stack+0x38/0x68 mm/kasan/common.c:38
kasan_record_aux_stack+0xd4/0x11c mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:2994 [inline]
call_rcu+0x118/0xb40 kernel/rcu/tree.c:3074
destroy_inode fs/inode.c:291 [inline]
evict+0x5fc/0x68c fs/inode.c:602
iput_final fs/inode.c:1705 [inline]
iput+0x744/0x824 fs/inode.c:1731
dentry_unlink_inode+0x370/0x4b0 fs/dcache.c:376
__dentry_kill+0x324/0x5e4 fs/dcache.c:582
dentry_kill+0xc8/0x250
dput+0x21c/0x458 fs/dcache.c:888
__fput+0x500/0x7f0 fs/file_table.c:288
____fput+0x20/0x30 fs/file_table.c:308
task_work_run+0x130/0x1e4 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
do_notify_resume+0x262c/0x32b8 arch/arm64/kernel/signal.c:946
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline]
el0_svc+0xfc/0x1f0 arch/arm64/kernel/entry-common.c:597
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the object at ffff0000fe04f800
which belongs to the cache sock_inode_cache of size 1408
The buggy address is located 128 bytes inside of
1408-byte region [ffff0000fe04f800, ffff0000fe04fd80)
The buggy address belongs to the page:
page:000000008ecb85ce refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x13e048
head:000000008ecb85ce order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff0000d063d001
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 dead000000000100 dead000000000122 ffff0000c0854480
raw: 0000000000000000 0000000080150015 00000001ffffffff ffff0000d063d001
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff0000fe04f780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff0000fe04f800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000fe04f880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff0000fe04f900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff0000fe04f980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.