Message-ID: <000000000000457db90591aac41c@google.com>
Date:   Tue, 03 Sep 2019 12:05:06 -0700
From:   syzbot <syzbot+9256cdd80b48e98d3902@...kaller.appspotmail.com>
To:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: kernel BUG at ./include/linux/highmem.h:LINE!

Hello,

syzbot found the following crash on:

HEAD commit:    6525771f Merge tag 'arc-5.3-rc7' of git://git.kernel.org/p..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17588432600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=58485246ad14eafe
dashboard link: https://syzkaller.appspot.com/bug?extid=9256cdd80b48e98d3902
compiler:       clang version 9.0.0 (/home/glider/llvm/clang  
80fee25776c2fb61e74c1ecb1a523375c2500b69)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+9256cdd80b48e98d3902@...kaller.appspotmail.com

attempt to access beyond end of device
loop3: rw=1, want=27689, limit=106
------------[ cut here ]------------
kernel BUG at ./include/linux/highmem.h:224!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 24596 Comm: syz-executor.3 Not tainted 5.3.0-rc6+ #94
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:zero_user_segments include/linux/highmem.h:224 [inline]
RIP: 0010:zero_user include/linux/highmem.h:245 [inline]
RIP: 0010:guard_bio_eod+0x632/0x640 fs/buffer.c:3043
Code: e8 ff e9 47 fe ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c a7 fe ff  
ff 4c 89 f7 e8 78 47 e8 ff e9 9a fe ff ff e8 2e 4f af ff <0f> 0b 66 90 66  
2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56
RSP: 0018:ffff88804b90eef8 EFLAGS: 00010283
RAX: ffffffff81c43b82 RBX: 0000000000004000 RCX: 0000000000040000
RDX: ffffc9000c775000 RSI: 0000000000005ba7 RDI: 0000000000005ba8
RBP: ffff88804b90ef48 R08: ffffffff81c439b5 R09: fffffbfff117be65
R10: fffffbfff117be65 R11: 0000000000000000 R12: 0000000000003e00
R13: 0000000000000200 R14: ffff88804ca5f548 R15: 1ffff1100994bea9
FS:  00007f038dbd5700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fa24000 CR3: 0000000094d86000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  mpage_bio_submit fs/mpage.c:65 [inline]
  mpage_readpages+0x519/0x5a0 fs/mpage.c:410
  fat_readpages+0x2c/0x40 fs/fat/inode.c:210
  read_pages+0xb0/0x3e0 mm/readahead.c:126
  __do_page_cache_readahead+0x480/0x530 mm/readahead.c:212
  ondemand_readahead+0x6e1/0xcf0 mm/internal.h:62
  page_cache_async_readahead+0x2af/0x340 mm/readahead.c:574
  generic_file_buffered_read mm/filemap.c:2079 [inline]
  generic_file_read_iter+0x6a6/0x21b0 mm/filemap.c:2344
  call_read_iter include/linux/fs.h:1864 [inline]
  new_sync_read fs/read_write.c:414 [inline]
  __vfs_read+0x59e/0x730 fs/read_write.c:427
  integrity_kernel_read+0x113/0x190 security/integrity/iint.c:200
  ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:352 [inline]
  ima_calc_file_shash security/integrity/ima/ima_crypto.c:381 [inline]
  ima_calc_file_hash+0xaef/0x1b20 security/integrity/ima/ima_crypto.c:446
  ima_collect_measurement+0x220/0x4a0 security/integrity/ima/ima_api.c:239
  process_measurement+0xbdb/0x16c0 security/integrity/ima/ima_main.c:311
  ima_file_check+0x9b/0xe0 security/integrity/ima/ima_main.c:422
  do_last fs/namei.c:3420 [inline]
  path_openat+0x1760/0x4460 fs/namei.c:3533
  do_filp_open+0x192/0x3d0 fs/namei.c:3563
  do_sys_open+0x29f/0x560 fs/open.c:1089
  __do_sys_open fs/open.c:1107 [inline]
  __se_sys_open fs/open.c:1102 [inline]
  __x64_sys_open+0x87/0x90 fs/open.c:1102
  do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:296
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459879
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f038dbd4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459879
RDX: 0000000000000000 RSI: 0000000000141042 RDI: 0000000020000400
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f038dbd56d4
R13: 00000000004f907f R14: 00000000004dac90 R15: 00000000ffffffff
Modules linked in:
---[ end trace 60aa945b5ab317e4 ]---
RIP: 0010:zero_user_segments include/linux/highmem.h:224 [inline]
RIP: 0010:zero_user include/linux/highmem.h:245 [inline]
RIP: 0010:guard_bio_eod+0x632/0x640 fs/buffer.c:3043
Code: e8 ff e9 47 fe ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c a7 fe ff  
ff 4c 89 f7 e8 78 47 e8 ff e9 9a fe ff ff e8 2e 4f af ff <0f> 0b 66 90 66  
2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56
RSP: 0018:ffff88804b90eef8 EFLAGS: 00010283
RAX: ffffffff81c43b82 RBX: 0000000000004000 RCX: 0000000000040000
RDX: ffffc9000c775000 RSI: 0000000000005ba7 RDI: 0000000000005ba8
RBP: ffff88804b90ef48 R08: ffffffff81c439b5 R09: fffffbfff117be65
R10: fffffbfff117be65 R11: 0000000000000000 R12: 0000000000003e00
R13: 0000000000000200 R14: ffff88804ca5f548 R15: 1ffff1100994bea9
FS:  00007f038dbd5700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fa24000 CR3: 0000000094d86000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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