syzbot


KASAN: global-out-of-bounds Read in __vmalloc_node_range

Status: auto-closed as invalid on 2019/10/31 04:54
Reported-by: syzbot+fdbd26afa8e5a43702a8@syzkaller.appspotmail.com
First crash: 1103d, last: 1087d

Sample crash report:
syz-executor.5 cpuset=syz5 mems_allowed=0-1
==================================================================
CPU: 1 PID: 22327 Comm: syz-executor.5 Not tainted 4.14.131 #25
BUG: KASAN: global-out-of-bounds in strscpy+0x20e/0x2c0 lib/string.c:206
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Read of size 8 at addr ffffffff8677b9f8 by task syz-executor.0/22334
Call Trace:

 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x138/0x19c lib/dump_stack.c:53
 warn_alloc.cold+0x96/0x1af mm/page_alloc.c:3248
 __vmalloc_node_range mm/vmalloc.c:1780 [inline]
 __vmalloc_node_range+0x3be/0x6a0 mm/vmalloc.c:1746
 __vmalloc_node mm/vmalloc.c:1809 [inline]
 __vmalloc_node_flags mm/vmalloc.c:1823 [inline]
 vmalloc+0x46/0x50 mm/vmalloc.c:1845
 sel_write_load+0x1a0/0x1050 security/selinux/selinuxfs.c:495
 __vfs_write+0x105/0x6b0 fs/read_write.c:480
 vfs_write+0x198/0x500 fs/read_write.c:544
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0xfd/0x230 fs/read_write.c:582
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4597c9
RSP: 002b:00007fbe448e1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004597c9
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbe448e26d4
R13: 00000000004c97d2 R14: 00000000004e0bc8 R15: 00000000ffffffff
CPU: 0 PID: 22334 Comm: syz-executor.0 Not tainted 4.14.131 #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x138/0x19c lib/dump_stack.c:53
 print_address_description.cold+0x5/0x1dc mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report mm/kasan/report.c:409 [inline]
 kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
 strscpy+0x20e/0x2c0 lib/string.c:206
 prepare_error_buf+0x94/0x1aa0 fs/reiserfs/prints.c:213
 __reiserfs_warning+0x9f/0xb0 fs/reiserfs/prints.c:288
 reiserfs_getopt fs/reiserfs/super.c:1044 [inline]
 reiserfs_parse_options+0xa16/0x1820 fs/reiserfs/super.c:1194
 reiserfs_fill_super+0x461/0x2b20 fs/reiserfs/super.c:1946
 mount_bdev+0x2be/0x370 fs/super.c:1134
 get_super_block+0x35/0x40 fs/reiserfs/super.c:2605
 mount_fs+0x97/0x2a1 fs/super.c:1237
 vfs_kern_mount.part.0+0x5e/0x3d0 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0x417/0x27d0 fs/namespace.c:2879
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xab/0x120 fs/namespace.c:3072
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c21a
RSP: 002b:00007fca12012a88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fca12012b40 RCX: 000000000045c21a
RDX: 00007fca12012ae0 RSI: 0000000020000200 RDI: 00007fca12012b00
RBP: 0000000000000004 R08: 00007fca12012b40 R09: 00007fca12012ae0
R10: 0000000000000002 R11: 0000000000000206 R12: 0000000000000004
R13: 00000000004c885f R14: 00000000004df470 R15: 00000000ffffffff

The buggy address belongs to the variable:
 __func__.31301+0x798/0x3a60

Memory state around the buggy address:
 ffffffff8677b880: fa fa fa fa 07 fa fa fa fa fa fa fa 00 02 fa fa
 ffffffff8677b900: fa fa fa fa 00 02 fa fa fa fa fa fa 06 fa fa fa
>ffffffff8677b980: fa fa fa fa 07 fa fa fa fa fa fa fa 00 00 00 02
                                                                ^
 ffffffff8677ba00: fa fa fa fa 00 03 fa fa fa fa fa fa 00 00 03 fa
 ffffffff8677ba80: fa fa fa fa 00 03 fa fa fa fa fa fa 00 03 fa fa
==================================================================

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-linux-4-14 2019/07/03 04:53 linux-4.14.y f4cc0ed9b2c7 55565fa0 .config log report
ci2-linux-4-14 2019/06/17 19:54 linux-4.14.y e861d0673eb8 442206d7 .config log report