linux-kernel - Re: WARNING in smk_write_relabel

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Message-ID: <00000000000073a06905b8eee114@google.com>
Date:   Fri, 15 Jan 2021 03:43:27 -0800
From:   syzbot <syzbot+670d1a1e6b6face0440a@...kaller.appspotmail.com>
To:     casey@...aufler-ca.com, jmorris@...ei.org,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, serge@...lyn.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: WARNING in smk_write_relabel_self

syzbot has found a reproducer for the following issue on:

HEAD commit:    5ee88057 Merge tag 'drm-fixes-2021-01-15' of git://anongit..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16a68ee7500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ee2266946ed36986
dashboard link: https://syzkaller.appspot.com/bug?extid=670d1a1e6b6face0440a
compiler:       clang version 11.0.1
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17ec309f500000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15d8889f500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+670d1a1e6b6face0440a@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 8457 at mm/page_alloc.c:4976 __alloc_pages_nodemask+0x4e5/0x5a0 mm/page_alloc.c:5020
Modules linked in:
CPU: 0 PID: 8457 Comm: syz-executor864 Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__alloc_pages_nodemask+0x4e5/0x5a0 mm/page_alloc.c:5020
Code: aa 09 00 e9 dd fd ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c eb fd ff ff 4c 89 ef e8 54 aa 09 00 8b 74 24 18 e9 da fd ff ff <0f> 0b e9 f3 fd ff ff a9 00 00 08 00 75 16 8b 4c 24 1c 89 cb 81 e3
RSP: 0018:ffffc900012ef9a0 EFLAGS: 00010246
RAX: ffffc900012efa20 RBX: ffffc900012efa20 RCX: 0000000000000000
RDX: 0000000000000028 RSI: 0000000000000000 RDI: ffffc900012efa48
RBP: ffffc900012efae0 R08: dffffc0000000000 R09: ffffc900012efa20
R10: fffff5200025df49 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000012 R14: 1ffff9200025df40 R15: 0000000000040cc0
FS:  00000000023a2880(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8e9dc94000 CR3: 0000000014b8a000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 alloc_pages include/linux/gfp.h:547 [inline]
 kmalloc_order+0x40/0x130 mm/slab_common.c:837
 kmalloc_order_trace+0x15/0x70 mm/slab_common.c:853
 kmalloc_large include/linux/slab.h:481 [inline]
 __kmalloc_track_caller+0x246/0x330 mm/slub.c:4457
 memdup_user_nul+0x26/0xf0 mm/util.c:260
 smk_write_relabel_self+0x17a/0x510 security/smack/smackfs.c:2748
 vfs_write+0x289/0xc90 fs/read_write.c:603
 ksys_write+0x171/0x2a0 fs/read_write.c:658
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440389
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd61b9f558 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440389
RDX: 0000000020000398 RSI: 0000000020000340 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b90
R13: 0000000000401c20 R14: 0000000000000000 R15: 0000000000000000