linux-kernel - Re: [syzbot] [mm?] BUG: unable to handle kernel paging request in mmap

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Message-ID: <00000000000053d3e60620af625f@google.com>
Date: Tue, 27 Aug 2024 12:38:21 -0700
From: syzbot <syzbot+3bca0d9eb36e75bc36ed@...kaller.appspotmail.com>
To: liam.howlett@...cle.com
Cc: akpm@...ux-foundation.org, liam.howlett@...cle.com, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, lorenzo.stoakes@...cle.com, 
	syzkaller-bugs@...glegroups.com, vbabka@...e.cz
Subject: Re: [syzbot] [mm?] BUG: unable to handle kernel paging request in mmap_region

> * syzbot <syzbot+3bca0d9eb36e75bc36ed@...kaller.appspotmail.com> [240827 13:28]:
>> Hello,
>> 
>> syzbot found the following issue on:
>> 
>> HEAD commit:    94ede2a3e913 profiling: remove stale percpu flip buffer va..
>> git tree:       upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=122f6d9d980000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=8b0cca2f3880513d
>> dashboard link: https://syzkaller.appspot.com/bug?extid=3bca0d9eb36e75bc36ed
>> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
>> 
>> Unfortunately, I don't have any reproducer for this issue yet.
>> 
>> Downloadable assets:
>> disk image: https://storage.googleapis.com/syzbot-assets/e10dde6d5041/disk-94ede2a3.raw.xz
>> vmlinux: https://storage.googleapis.com/syzbot-assets/3bda8d01811d/vmlinux-94ede2a3.xz
>> kernel image: https://storage.googleapis.com/syzbot-assets/653dc61d9ae6/bzImage-94ede2a3.xz
>> 
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+3bca0d9eb36e75bc36ed@...kaller.appspotmail.com
>> 
>> kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
>> BUG: unable to handle page fault for address: ffffea000169a5c0
>> #PF: supervisor instruction fetch in kernel mode
>> #PF: error_code(0x0011) - permissions violation
>> PGD 13fff7067 P4D 13fff7067 PUD 13fff6067 PMD 800000013d4001e3 
>> Oops: Oops: 0011 [#1] PREEMPT SMP KASAN NOPTI
>> CPU: 0 UID: 0 PID: 6910 Comm: syz.0.357 Not tainted 6.11.0-rc1-syzkaller-00043-g94ede2a3e913 #0
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
>> RIP: 0010:0xffffea000169a5c0
>> Code: ad de 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 24 00 24 00 00 00 00 00 ff ff ff fd 01 00 00 00 01 e8 e4 2c 80 88 ff ff <00> 00 00 00 00 f0 ff 00 00 00 00 00 00 00 00 00 22 01 00 00 00 00
>> RSP: 0018:ffffc90002e0f8f8 EFLAGS: 00010286
>> RAX: 1ffff1100be13426 RBX: ffff88805f09a130 RCX: dffffc0000000000
>> RDX: ffff88807f842600 RSI: 0000000000000002 RDI: ffff88805f09a120
>> RBP: ffffc90002e0fa30 R08: ffff88802b3aecc7 R09: 1ffff11005675d98
>> R10: dffffc0000000000 R11: ffffea000169a5c0 R12: ffff88807f842600
>> R13: ffff88805f09a120 R14: ffff88802b3aed50 R15: ffff88802b3aecb8
>> FS:  00007f32016ce6c0(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
>> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> CR2: ffffea000169a5c0 CR3: 000000005af9c000 CR4: 0000000000350ef0
>> Call Trace:
>>  <TASK>
>>  mmap_region+0x1891/0x2090 mm/mmap.c:3058
>>  do_mmap+0x8f9/0x1010 mm/mmap.c:1468
>>  vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588
>>  ksys_mmap_pgoff+0x4f1/0x720 mm/mmap.c:1514
>>  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>>  do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
>>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
>> RIP: 0033:0x7f3200977299
>> 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 a8 ff ff ff f7 d8 64 89 01 48
>> RSP: 002b:00007f32016ce048 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
>> RAX: ffffffffffffffda RBX: 00007f3200b06058 RCX: 00007f3200977299
>> RDX: 0000000000000001 RSI: 0000000000003000 RDI: 0000000020000000
>> RBP: 00007f32009e48e6 R08: 0000000000000012 R09: 0000000000000000
>> R10: 0000000000000012 R11: 0000000000000246 R12: 0000000000000000
>> R13: 000000000000006e R14: 00007f3200b06058 R15: 00007ffebfee75d8
>>  </TASK>
>> Modules linked in:
>> CR2: ffffea000169a5c0
>> ---[ end trace 0000000000000000 ]---
>> RIP: 0010:0xffffea000169a5c0
>> Code: ad de 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 24 00 24 00 00 00 00 00 ff ff ff fd 01 00 00 00 01 e8 e4 2c 80 88 ff ff <00> 00 00 00 00 f0 ff 00 00 00 00 00 00 00 00 00 22 01 00 00 00 00
>> RSP: 0018:ffffc90002e0f8f8 EFLAGS: 00010286
>> RAX: 1ffff1100be13426 RBX: ffff88805f09a130 RCX: dffffc0000000000
>> RDX: ffff88807f842600 RSI: 0000000000000002 RDI: ffff88805f09a120
>> RBP: ffffc90002e0fa30 R08: ffff88802b3aecc7 R09: 1ffff11005675d98
>> R10: dffffc0000000000 R11: ffffea000169a5c0 R12: ffff88807f842600
>> R13: ffff88805f09a120 R14: ffff88802b3aed50 R15: ffff88802b3aecb8
>> FS:  00007f32016ce6c0(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
>> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> CR2: ffffea000169a5c0 CR3: 000000005af9c000 CR4: 0000000000350ef0
>> 
>> 
>> ---
>> This report is generated by a bot. It may contain errors.
>> See https://goo.gl/tpsmEJ for more information about syzbot.
>> syzbot engineers can be reached at syzkaller@...glegroups.com.
>> 
>> syzbot will keep track of this issue. See:
>> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>> 
>> If the report is already addressed, let syzbot know by replying with:
>> #syz fix: exact-commit-title
>
> #syz test: git://git.infradead.org/users/jedix/linux-maple.git 71e79d60d610967946f5b5a9fe12dd239216ac39

This crash does not have a reproducer. I cannot test it.

>
>> 
>> If you want to overwrite report's subsystems, reply with:
>> #syz set subsystems: new-subsystem
>> (See the list of subsystem names on the web dashboard)
>> 
>> If the report is a duplicate of another one, reply with:
>> #syz dup: exact-subject-of-another-report
>> 
>> If you want to undo deduplication, reply with:
>> #syz undup
>>