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Fri, 15 Jan 2021 03:43:27 -0800 (PST) Date: Fri, 15 Jan 2021 03:43:27 -0800 In-Reply-To: <00000000000077819e05b8e0acc8@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000073a06905b8eee114@google.com> Subject: Re: WARNING in smk_write_relabel_self From: syzbot To: casey@schaufler-ca.com, jmorris@namei.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, serge@hallyn.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: 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@syzkaller.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