syzbot


WARNING in __get_free_pages
Status: fixed on 2022/03/08 16:11
Reported-by: syzbot+23a02c7df2cf2bc93fa2@syzkaller.appspotmail.com
Fix commit: 545a32498c53 floppy: Add max size check for user space request
First crash: 197d, last: 135d

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 29987 at mm/page_alloc.c:5344 current_gfp_context include/linux/sched/mm.h:195 [inline]
WARNING: CPU: 0 PID: 29987 at mm/page_alloc.c:5344 __alloc_pages+0x45d/0x500 mm/page_alloc.c:5356
Modules linked in:
CPU: 3 PID: 29987 Comm: syz-executor.0 Not tainted 5.16.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:__alloc_pages+0x45d/0x500 mm/page_alloc.c:5344
Code: be c9 00 00 00 48 c7 c7 40 7b b7 89 c6 05 c5 68 c8 0b 01 e8 bc dc 4f 07 e9 6a ff ff ff 0f 0b e9 a0 fd ff ff 40 80 e5 3f eb 88 <0f> 0b e9 18 ff ff ff 4c 89 ef 44 89 e6 45 31 ed e8 1e 76 ff ff e9
RSP: 0018:ffffc90022fbf850 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff920045f7f0b RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000033 RDI: 0000000000010cc1
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff81bba826 R11: 0000000000000001 R12: ffffffff90508b60
R13: 0000000000000033 R14: 0000000000000000 R15: ffff88801bdade30
FS:  0000000000000000(0000) GS:ffff88802ca00000(0063) knlGS:00000000f58f2b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000202a7000 CR3: 00000000213ae000 CR4: 0000000000152ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2190
 __get_free_pages+0x8/0x40 mm/page_alloc.c:5418
 raw_cmd_copyin drivers/block/floppy.c:3113 [inline]
 raw_cmd_ioctl drivers/block/floppy.c:3160 [inline]
 fd_locked_ioctl+0x11e3/0x2820 drivers/block/floppy.c:3528
 fd_ioctl drivers/block/floppy.c:3555 [inline]
 fd_compat_ioctl+0x891/0x1b60 drivers/block/floppy.c:3869
 compat_blkdev_ioctl+0x3b8/0x810 block/ioctl.c:674
 __do_compat_sys_ioctl+0x1c7/0x290 fs/ioctl.c:972
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf6f19549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f58f25bc EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000258
RDX: 0000000020000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	03 74 c0 01          	add    0x1(%rax,%rax,8),%esi
   4:	10 05 03 74 b8 01    	adc    %al,0x1b87403(%rip)        # 0x1b8740d
   a:	10 06                	adc    %al,(%rsi)
   c:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
  10:	10 07                	adc    %al,(%rdi)
  12:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
  16:	10 08                	adc    %cl,(%rax)
  18:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1c:	00 00                	add    %al,(%rax)
  1e:	00 00                	add    %al,(%rax)
  20:	00 51 52             	add    %dl,0x52(%rcx)
  23:	55                   	push   %rbp
  24:	89 e5                	mov    %esp,%ebp
  26:	0f 34                	sysenter
  28:	cd 80                	int    $0x80
* 2a:	5d                   	pop    %rbp <-- trapping instruction
  2b:	5a                   	pop    %rdx
  2c:	59                   	pop    %rcx
  2d:	c3                   	retq
  2e:	90                   	nop
  2f:	90                   	nop
  30:	90                   	nop
  31:	90                   	nop
  32:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  39:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi

Crashes (21):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-qemu-upstream-386 2022/01/11 17:33 upstream fe8152b38d3a 1884f55a .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2022/01/10 17:03 upstream df0cc57e057f 2ca0d385 .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2022/01/09 19:00 upstream 4634129ad9fd 2ca0d385 .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2021/12/06 01:26 upstream 944207047ca4 a617004c .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2021/12/04 11:26 upstream 12119cfa1052 a617004c .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2021/12/04 05:01 upstream 12119cfa1052 a617004c .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2021/12/03 06:17 upstream a51e3ac43ddb 61f86278 .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2021/12/02 18:39 upstream 58e1100fdc59 61f86278 .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2021/12/02 06:54 upstream 58e1100fdc59 61f86278 .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2021/11/28 19:15 upstream 3498e7f2bb41 63eeac02 .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2021/11/26 09:59 upstream b501b85957de 63eeac02 .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2021/11/24 16:14 upstream 5d9f4cf36721 545ab074 .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2021/11/23 10:47 upstream 136057256686 545ab074 .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2021/11/23 06:12 upstream 136057256686 545ab074 .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2021/11/22 23:03 upstream 136057256686 545ab074 .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2021/11/18 04:02 upstream ee1703cda8dc cafff8b6 .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2021/11/17 15:35 upstream 8ab774587903 cafff8b6 .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2021/11/15 19:37 upstream 8ab774587903 83f5c9b5 .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2021/11/11 21:51 upstream debe436e77c7 75b04091 .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2021/11/10 04:27 upstream cb690f5238d7 55fa030c .config log report info WARNING in __get_free_pages
ci-qemu-upstream-386 2021/11/10 03:31 upstream cb690f5238d7 55fa030c .config log report info WARNING in __get_free_pages