RBP: 00007f43b0d6f1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff380b525f R14: 00007f43b0d6f300 R15: 0000000000022000
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 PID: 13606 Comm: syz-executor.3 Not tainted 6.3.0-rc6-next-20230413 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:folio_wait_stable+0x23/0xe0
Code: 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 fd 53 e8 62 58 e7 ff 48 8d 7d 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 a4 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b
RSP: 0018:ffff88801a69f9f0 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: ffff888045c1efa8 RCX: ffffc90000be5000
RDX: 0000000000000001 RSI: ffffffff81646e3e RDI: 000000000000000c
RBP: fffffffffffffff4 R08: 0000000000000001 R09: ffffffff856c1213
R10: fffffbfff0ad8242 R11: 0000000000000001 R12: 0000000000000000
R13: ffff888045c1f1d0 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f43b0d6f700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f43b0d6ef78 CR3: 0000000044e6e000 CR4: 0000000000350ee0
Call Trace:
ext4_da_write_begin+0x38d/0x830
generic_perform_write+0x25a/0x580
ext4_buffered_write_iter+0x164/0x460
ext4_file_write_iter+0x3ff/0x1950
vfs_write+0x9b5/0xdc0
ksys_write+0x12b/0x260
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f43b37f9b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
RSP: 002b:00007f43b0d6f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
CPU: 0 PID: 13618 Comm: syz-executor.6 Not tainted 6.3.0-rc6-next-20230413 #1
RAX: ffffffffffffffda RBX: 00007f43b390cf60 RCX: 00007f43b37f9b19
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RDX: 00000000000292e9 RSI: 0000000020000080 RDI: 0000000000000006
Call Trace:
RBP: 00007f43b0d6f1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
dump_stack_lvl+0xc1/0xf0
R13: 00007fff380b525f R14: 00007f43b0d6f300 R15: 0000000000022000
should_fail_ex+0x4b4/0x5b0
_copy_from_user+0x2e/0x180
Modules linked in:
__import_iovec+0x50d/0x820
---[ end trace 0000000000000000 ]---
RIP: 0010:folio_wait_stable+0x23/0xe0
import_iovec+0x87/0xb0
Code: 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 fd 53 e8 62 58 e7 ff 48 8d 7d 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 a4 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b
copy_msghdr_from_user+0xed/0x150
RSP: 0018:ffff88801a69f9f0 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: ffff888045c1efa8 RCX: ffffc90000be5000
___sys_sendmsg+0xdd/0x1b0
RDX: 0000000000000001 RSI: ffffffff81646e3e RDI: 000000000000000c
RBP: fffffffffffffff4 R08: 0000000000000001 R09: ffffffff856c1213
R10: fffffbfff0ad8242 R11: 0000000000000001 R12: 0000000000000000
R13: ffff888045c1f1d0 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f43b0d6f700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f43b0d6ef78 CR3: 0000000044e6e000 CR4: 0000000000350ee0
__sys_sendmsg+0xf7/0x1d0
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f74058f5b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7402e4a188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f7405a09020 RCX: 00007f74058f5b19
RDX: 0000000000000e00 RSI: 0000000020000780 RDI: 0000000000000005
RBP: 00007f7402e4a1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd6e93c6ef R14: 00007f7402e4a300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 13629 Comm: syz-executor.1 Tainted: G D 6.3.0-rc6-next-20230413 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xc1/0xf0
should_fail_ex+0x4b4/0x5b0
copyin+0x19/0x120
_copy_from_iter+0x1e0/0x1200
raw_sendmsg+0x1cff/0x2c80
inet_sendmsg+0x121/0x150
sock_sendmsg+0x19b/0x200
____sys_sendmsg+0x74e/0x980
___sys_sendmsg+0x110/0x1b0
__sys_sendmsg+0xf7/0x1d0
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7fcb25dc9b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcb2333f188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fcb25edcf60 RCX: 00007fcb25dc9b19
RDX: 0000000000000e00 RSI: 0000000020000780 RDI: 0000000000000006
RBP: 00007fcb2333f1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffca1b19bff R14: 00007fcb2333f300 R15: 0000000000022000
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 13635 Comm: syz-executor.4 Tainted: G D 6.3.0-rc6-next-20230413 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xc1/0xf0
should_fail_ex+0x4b4/0x5b0
should_failslab+0x9/0x20
kmem_cache_alloc_node+0x5d/0x3a0
__alloc_skb+0x28c/0x330
__ip_append_data+0x2d2b/0x3aa0
ip_append_data+0x115/0x1a0
raw_sendmsg+0xa9f/0x2c80
inet_sendmsg+0x121/0x150
sock_sendmsg+0x19b/0x200
____sys_sendmsg+0x74e/0x980
___sys_sendmsg+0x110/0x1b0
__sys_sendmsg+0xf7/0x1d0
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7fc140e0fb19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc13e385188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fc140f22f60 RCX: 00007fc140e0fb19
RDX: 0000000000000e00 RSI: 0000000020000780 RDI: 0000000000000006
RBP: 00007fc13e3851d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffa7ad228f R14: 00007fc13e385300 R15: 0000000000022000
==================================================================
BUG: KASAN: slab-use-after-free in rwsem_down_write_slowpath+0x13a6/0x14a0
Read of size 4 at addr ffff88804387d074 by task syz-executor.3/270
CPU: 1 PID: 270 Comm: syz-executor.3 Tainted: G D 6.3.0-rc6-next-20230413 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0x91/0xf0
print_report+0xcc/0x620
kasan_report+0xc0/0xf0
rwsem_down_write_slowpath+0x13a6/0x14a0
down_write+0x1c3/0x1f0
vfs_unlink+0xd9/0x930
do_unlinkat+0x3b9/0x650
__x64_sys_unlink+0xca/0x110
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f43b37f9457
Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff380b43a8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f43b37f9457
RDX: 00007fff380b43e0 RSI: 00007fff380b43e0 RDI: 00007fff380b4470
RBP: 00007fff380b4470 R08: 0000000000000001 R09: 00007fff380b4240
R10: 00005555570d0d13 R11: 0000000000000206 R12: 00007f43b3853105
R13: 00007fff380b5530 R14: 00005555570d0c20 R15: 00007fff380b5570
Allocated by task 13597:
kasan_save_stack+0x22/0x50
kasan_set_track+0x25/0x30
__kasan_slab_alloc+0x59/0x70
kmem_cache_alloc_node+0x189/0x3a0
copy_process+0x3c2/0x7330
kernel_clone+0xeb/0x7d0
__do_sys_clone+0xba/0x100
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
Freed by task 13597:
kasan_save_stack+0x22/0x50
kasan_set_track+0x25/0x30
kasan_save_free_info+0x2e/0x50
__kasan_slab_free+0x10a/0x190
kmem_cache_free+0xff/0x4a0
_free_event+0xab4/0x1150
perf_event_release_kernel+0x5b8/0x7a0
perf_release+0x37/0x50
__fput+0x263/0xa40
task_work_run+0x174/0x280
exit_to_user_mode_prepare+0x17d/0x180
syscall_exit_to_user_mode+0x1d/0x50
do_syscall_64+0x4c/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
Last potentially related work creation:
kasan_save_stack+0x22/0x50
__kasan_record_aux_stack+0x95/0xb0
__call_rcu_common.constprop.0+0x6a/0xb90
put_task_struct_rcu_user+0x87/0xd0
__schedule+0x995/0x2a00
schedule+0xdb/0x1a0
schedule_preempt_disabled+0x10/0x20
__down_read_common+0x7fd/0x11e0
kernfs_dop_revalidate+0xf0/0x5b0
lookup_fast+0x237/0x530
walk_component+0x5e/0x5b0
path_lookupat+0x1ba/0x850
path_openat+0x173b/0x2750
do_filp_open+0x1ba/0x410
do_sys_openat2+0x171/0x4c0
__x64_sys_openat+0x143/0x200
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
Second to last potentially related work creation:
kasan_save_stack+0x22/0x50
__kasan_record_aux_stack+0x95/0xb0
__call_rcu_common.constprop.0+0x6a/0xb90
put_task_struct_rcu_user+0x87/0xd0
wait_consider_task+0x2f59/0x3c40
do_wait+0x777/0xbc0
kernel_wait4+0x150/0x260
__do_sys_wait4+0x143/0x150
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x72/0xdc
The buggy address belongs to the object at ffff88804387d040
which belongs to the cache task_struct of size 6592
The buggy address is located 52 bytes inside of
freed 6592-byte region [ffff88804387d040, ffff88804387ea00)
The buggy address belongs to the physical page:
page:00000000c72a4c12 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88804387b580 pfn:0x43878
head:00000000c72a4c12 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800c66f641
anon flags: 0x100000000010200(slab|head|node=0|zone=1)
page_type: 0xffffffff()
raw: 0100000000010200 ffff888008792640 0000000000000000 dead000000000001
raw: ffff88804387b580 0000000080040003 00000001ffffffff ffff88800c66f641
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88804387cf00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88804387cf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88804387d000: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
^
ffff88804387d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804387d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: 90 nop
6: 90 nop
7: f3 0f 1e fa endbr64
b: 55 push %rbp
c: 48 89 fd mov %rdi,%rbp
f: 53 push %rbx
10: e8 62 58 e7 ff callq 0xffe75877
15: 48 8d 7d 18 lea 0x18(%rbp),%rdi
19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
20: fc ff df
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 a4 00 00 00 jne 0xd8
34: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
3b: fc ff df
3e: 48 rex.W
3f: 8b .byte 0x8b