syzbot


BUG: bad usercopy in fpa_set

Status: upstream: reported C repro on 2023/05/05 12:53
Subsystems: mm hardening
[Documentation on labels]
Reported-by: syzbot+cb76c2983557a07cdb14@syzkaller.appspotmail.com
First crash: 212d, last: 10h02m
Discussions (3)
Title Replies (including bot) Last reply
[syzbot] Monthly mm report (Nov 2023) 0 (1) 2023/11/15 03:00
[syzbot] Monthly mm report (Jun 2023) 0 (1) 2023/06/07 22:37
[syzbot] [hardening?] [mm?] BUG: bad usercopy in fpa_set 0 (2) 2023/05/07 11:03
Last patch testing requests (1)
Created Duration User Patch Repo Result
2023/08/21 16:23 4m retest repro upstream error OK

Sample crash report:
usercopy: Kernel memory overwrite attempt detected to SLUB object 'task_struct' (offset 80, size 116)!
------------[ cut here ]------------
kernel BUG at mm/usercopy.c:102!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 PID: 3083 Comm: syz-executor190 Not tainted 6.6.0-rc6-syzkaller #0
Hardware name: ARM-Versatile Express
PC is at usercopy_abort+0x98/0x9c mm/usercopy.c:102
LR is at __wake_up_klogd.part.0+0x7c/0xac kernel/printk/printk.c:3868
pc : [<818257cc>]    lr : [<802b69ac>]    psr: 60000013
sp : dfa59e48  ip : dfa59d90  fp : dfa59e6c
r10: 0000001a  r9 : 84531780  r8 : 84532390
r7 : dde94ac0  r6 : 00000000  r5 : 00000074  r4 : 00000050
r3 : 84531780  r2 : 00000000  r1 : 00000000  r0 : 00000066
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 8442c2c0  DAC: fffffffd
Register r0 information: non-paged memory
Register r1 information: NULL pointer
Register r2 information: NULL pointer
Register r3 information: slab task_struct start 84531780 pointer offset 0 size 3008
Register r4 information: non-paged memory
Register r5 information: non-paged memory
Register r6 information: NULL pointer
Register r7 information: non-slab/vmalloc memory
Register r8 information: slab task_struct start 84532340 pointer offset 80 size 3008
Register r9 information: slab task_struct start 84531780 pointer offset 0 size 3008
Register r10 information: non-paged memory
Register r11 information: 2-page vmalloc region starting at 0xdfa58000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909
Register r12 information: 2-page vmalloc region starting at 0xdfa58000 allocated at kernel_clone+0xac/0x424 kernel/fork.c:2909
Process syz-executor190 (pid: 3083, stack limit = 0xdfa58000)
Stack: (0xdfa59e48 to 0xdfa5a000)
9e40:                   81fd069c 81fa5b28 81fba240 00000050 00000074 84531780
9e60: dfa59e9c dfa59e70 804b2fd8 81825740 00000074 dfa59e80 802162b4 84532390
9e80: 00000074 00000000 84532404 dde94ac0 dfa59ed4 dfa59ea0 804d1e68 804b2f0c
9ea0: 00000074 00000000 dfa59ec4 84532390 00000074 00000000 00000000 00000000
9ec0: 84531780 0000001a dfa59efc dfa59ed8 80209f08 804d1c88 84532340 ddde5640
9ee0: dfa59f04 dfa59ef0 00000000 0000000c dfa59f74 dfa59f00 8020a544 80209e84
9f00: 00000000 00000000 84532340 00008008 dfa59f2c dfa59f20 81849880 80278ea8
9f20: dfa59f74 dfa59f30 8027ea10 8184985c 8027a84c 60000013 817f951c 8180ecb4
9f40: dfa59f5c 4f4e6812 0000000f 84532340 0000000f 4f4e6812 84532340 0000000f
9f60: 00000000 00000000 dfa59fa4 dfa59f78 802528c0 8020a25c 00000000 4f4e6812
9f80: 00000000 00000000 0008e050 0000001a 80200288 84531780 00000000 dfa59fa8
9fa0: 80200060 80252690 00000000 00000000 0000000f 00000c0c 00000000 00000000
9fc0: 00000000 00000000 0008e050 0000001a 000f4240 00000000 7ef9bc84 00003a97
9fe0: 7ef9bc70 7ef9bc60 00010638 0002e780 00000010 0000000f 00000000 00000000
Backtrace: 
[<81825734>] (usercopy_abort) from [<804b2fd8>] (__check_heap_object+0xd8/0xf4 mm/slub.c:4784)
[<804b2f00>] (__check_heap_object) from [<804d1e68>] (check_heap_object mm/usercopy.c:196 [inline])
[<804b2f00>] (__check_heap_object) from [<804d1e68>] (__check_object_size mm/usercopy.c:251 [inline])
[<804b2f00>] (__check_heap_object) from [<804d1e68>] (__check_object_size+0x1ec/0x30c mm/usercopy.c:213)
 r8:dde94ac0 r7:84532404 r6:00000000 r5:00000074 r4:84532390
[<804d1c7c>] (__check_object_size) from [<80209f08>] (check_object_size include/linux/thread_info.h:215 [inline])
[<804d1c7c>] (__check_object_size) from [<80209f08>] (__copy_from_user include/linux/uaccess.h:101 [inline])
[<804d1c7c>] (__check_object_size) from [<80209f08>] (user_regset_copyin include/linux/regset.h:268 [inline])
[<804d1c7c>] (__check_object_size) from [<80209f08>] (fpa_set+0x90/0xfc arch/arm/kernel/ptrace.c:587)
 r10:0000001a r9:84531780 r8:00000000 r7:00000000 r6:00000000 r5:00000074
 r4:84532390
[<80209e78>] (fpa_set) from [<8020a544>] (copy_regset_from_user include/linux/regset.h:337 [inline])
[<80209e78>] (fpa_set) from [<8020a544>] (arch_ptrace+0x2f4/0x3e4 arch/arm/kernel/ptrace.c:762)
 r5:0000000c r4:00000000
[<8020a250>] (arch_ptrace) from [<802528c0>] (__do_sys_ptrace kernel/ptrace.c:1305 [inline])
[<8020a250>] (arch_ptrace) from [<802528c0>] (sys_ptrace+0x23c/0x4c0 kernel/ptrace.c:1278)
 r7:00000000 r6:00000000 r5:0000000f r4:84532340
[<80252684>] (sys_ptrace) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66)
Exception stack(0xdfa59fa8 to 0xdfa59ff0)
9fa0:                   00000000 00000000 0000000f 00000c0c 00000000 00000000
9fc0: 00000000 00000000 0008e050 0000001a 000f4240 00000000 7ef9bc84 00003a97
9fe0: 7ef9bc70 7ef9bc60 00010638 0002e780
 r9:84531780 r8:80200288 r7:0000001a r6:0008e050 r5:00000000 r4:00000000
Code: e30006a0 e34801fd e58dc000 ebfff341 (e7f001f2) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	e30006a0 	movw	r0, #1696	@ 0x6a0
   4:	e34801fd 	movt	r0, #33277	@ 0x81fd
   8:	e58dc000 	str	ip, [sp]
   c:	ebfff341 	bl	0xffffcd18
* 10:	e7f001f2 	udf	#18 <-- trapping instruction

Crashes (333):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/10/17 19:33 upstream 213f891525c2 342b9c55 .config console log report syz C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/05/07 11:02 upstream 457391b03803 90c93c40 .config console log report syz C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/12/03 12:50 upstream 1b8af6552cb7 f819d6f7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/12/03 10:47 upstream 1b8af6552cb7 f819d6f7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/12/02 19:21 upstream 815fb87b7530 f819d6f7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/12/02 17:57 upstream 815fb87b7530 f819d6f7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/12/02 02:15 upstream 994d5c58e50e f819d6f7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/30 13:56 upstream 3b47bc037bd4 f819d6f7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/30 13:31 upstream 3b47bc037bd4 f819d6f7 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/27 08:46 upstream d2da77f431ac 5b429f39 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/26 05:44 upstream b46ae77f6787 5b429f39 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/25 17:05 upstream 0f5cc96c367f 5b429f39 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/25 15:52 upstream 0f5cc96c367f 5b429f39 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/25 14:17 upstream 0f5cc96c367f 5b429f39 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/24 18:55 upstream f1a09972a45a 5b429f39 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/24 05:33 upstream d3fa86b1a7b4 5b429f39 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/23 15:47 upstream 9b6de136b5f0 fc59b78e .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/21 07:22 upstream 98b1cc82c4af cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/19 20:43 upstream 037266a5f723 cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/19 20:34 upstream 037266a5f723 cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/19 19:27 upstream 037266a5f723 cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/19 18:26 upstream 037266a5f723 cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/19 07:20 upstream 23dfa043f6d5 cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/18 16:43 upstream 791c8ab095f7 cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/18 03:17 upstream 6bc40e44f1dd cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/18 00:06 upstream 6bc40e44f1dd cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/17 05:27 upstream 7475e51b8796 cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/17 04:53 upstream 7475e51b8796 cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/17 01:37 upstream 7475e51b8796 cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/16 06:25 upstream c42d9eeef8e5 cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/15 16:57 upstream 86d11b0e20c0 cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/15 00:43 upstream 9bacdd8996c7 cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/14 23:38 upstream 9bacdd8996c7 cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/14 15:57 upstream 9bacdd8996c7 cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/14 02:43 upstream b85ea95d0864 cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/14 01:15 upstream b85ea95d0864 cb976f63 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/12 00:16 upstream 3ca112b71f35 d80eec66 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/11 23:11 upstream 3ca112b71f35 d80eec66 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/11 12:13 upstream 18553507f60f d80eec66 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/09 23:00 upstream 6bc986ab839c 047604c6 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/09 21:54 upstream 6bc986ab839c 047604c6 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/09 10:39 upstream 34f763262743 4862372a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/09 10:26 upstream 34f763262743 4862372a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/09 09:17 upstream 34f763262743 4862372a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/09 08:02 upstream 34f763262743 4862372a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/08 20:05 upstream 305230142ae0 b93f63e8 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/08 07:48 upstream 13d88ac54ddd 83211397 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/07 15:36 upstream be3ca57cfb77 83211397 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/11/07 14:27 upstream be3ca57cfb77 83211397 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/05/05 10:50 upstream 457391b03803 518a39a6 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
2023/05/05 08:20 upstream 457391b03803 518a39a6 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 BUG: bad usercopy in fpa_set
* Struck through repros no longer work on HEAD.