syzbot


KASAN: out-of-bounds Write in udf_write_fi

Status: upstream: reported C repro on 2023/02/23 05:38
Reported-by: syzbot+51d3ca1b8603c95ebe71@syzkaller.appspotmail.com
First crash: 425d, last: 425d
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 KASAN: null-ptr-deref Write in udf_write_fi origin:lts-only C inconclusive 16 43d 330d 0/3 upstream: reported C repro on 2023/05/29 04:55
linux-5.15 KASAN: out-of-bounds Write in udf_write_fi origin:lts-only C done 17 138d 386d 0/3 upstream: reported C repro on 2023/04/03 11:46
linux-4.19 KASAN: out-of-bounds Write in udf_write_fi udf C error 9 427d 807d 0/1 upstream: reported C repro on 2022/02/06 00:22
upstream KASAN: null-ptr-deref Write in udf_write_fi udf C inconclusive done 51 452d 575d 22/26 fixed on 2023/06/08 14:41

Sample crash report:
RBP: 00007ffc914fb510 R08: 0000000000000002 R09: 00007ffc914fb698
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
==================================================================
BUG: KASAN: out-of-bounds in memset include/linux/string.h:361 [inline]
BUG: KASAN: out-of-bounds in udf_write_fi+0x875/0xe80 fs/udf/namei.c:93
Write of size 18446744073709551572 at addr ffff88808aa7102c by task syz-executor428/7965

CPU: 0 PID: 7965 Comm: syz-executor428 Not tainted 4.14.306-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:251
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:350
 kasan_report+0x6f/0x80 mm/kasan/report.c:408
 memset+0x20/0x40 mm/kasan/kasan.c:285
 memset include/linux/string.h:361 [inline]
 udf_write_fi+0x875/0xe80 fs/udf/namei.c:93
 udf_rename+0x3e5/0x11b0 fs/udf/namei.c:1194
 vfs_rename+0x560/0x1820 fs/namei.c:4498
 SYSC_renameat2 fs/namei.c:4646 [inline]
 SyS_renameat2+0x95b/0xad0 fs/namei.c:4535
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7ff2fe032219
RSP: 002b:00007ffc914fb4f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007ff2fe032219
RDX: 0000000000000510 RSI: 0000000020000100 RDI: 0000000020000040
RBP: 00007ffc914fb510 R08: 0000000000000002 R09: 00007ffc914fb698
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea00022a9c40 count:3 mapcount:0 mapping:ffff8880b1d8f4a8 index:0xa8
flags: 0xfff00000001054(referenced|dirty|active|private)
raw: 00fff00000001054 ffff8880b1d8f4a8 00000000000000a8 00000003ffffffff
raw: dead000000000100 dead000000000200 ffff88808dbc0000 ffff88823b3288c0
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff88823b3288c0

Memory state around the buggy address:
 ffff88808aa70f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88808aa70f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88808aa71000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                  ^
 ffff88808aa71080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88808aa71100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/02/23 05:38 linux-4.14.y 1e61bd26fa2c 9f1e2cb3 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-4-14 KASAN: out-of-bounds Write in udf_write_fi
* Struck through repros no longer work on HEAD.