syzbot


KASAN: wild-memory-access Read in hfsplus_bnode_dump

Status: upstream: reported C repro on 2023/04/17 05:34
Labels: hfs (incorrect?)
Reported-by: syzbot+f687659f3c2acfa34201@syzkaller.appspotmail.com
First crash: 51d, last: 7d18h

Cause bisection: failed (error log, bisect log)
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [hfs?] KASAN: wild-memory-access Read in hfsplus_bnode_dump 0 (2) 2023/05/25 20:03

Sample crash report:
memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=4993 'syz-executor106'
loop0: detected capacity change from 0 to 1024
hfsplus: request for non-existent node 32768 in B*Tree
hfsplus: request for non-existent node 32768 in B*Tree
==================================================================
BUG: KASAN: wild-memory-access in memcpy_from_page include/linux/highmem.h:417 [inline]
BUG: KASAN: wild-memory-access in hfsplus_bnode_read fs/hfsplus/bnode.c:32 [inline]
BUG: KASAN: wild-memory-access in hfsplus_bnode_read_u16 fs/hfsplus/bnode.c:45 [inline]
BUG: KASAN: wild-memory-access in hfsplus_bnode_dump+0x403/0xba0 fs/hfsplus/bnode.c:305
Read of size 2 at addr 000508800000103e by task syz-executor106/4993

CPU: 0 PID: 4993 Comm: syz-executor106 Not tainted 6.4.0-rc3-syzkaller-00032-g933174ae28ba #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/16/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_report+0xe6/0x540 mm/kasan/report.c:465
 kasan_report+0x176/0x1b0 mm/kasan/report.c:572
 kasan_check_range+0x283/0x290 mm/kasan/generic.c:187
 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
 memcpy_from_page include/linux/highmem.h:417 [inline]
 hfsplus_bnode_read fs/hfsplus/bnode.c:32 [inline]
 hfsplus_bnode_read_u16 fs/hfsplus/bnode.c:45 [inline]
 hfsplus_bnode_dump+0x403/0xba0 fs/hfsplus/bnode.c:305
 hfsplus_brec_remove+0x42c/0x4f0 fs/hfsplus/brec.c:229
 __hfsplus_delete_attr+0x275/0x450 fs/hfsplus/attributes.c:299
 hfsplus_delete_all_attrs+0x26b/0x3c0 fs/hfsplus/attributes.c:378
 hfsplus_delete_cat+0xb87/0xfc0 fs/hfsplus/catalog.c:425
 hfsplus_unlink+0x363/0x7f0 fs/hfsplus/dir.c:385
 vfs_unlink+0x35d/0x5f0 fs/namei.c:4327
 do_unlinkat+0x4a7/0x950 fs/namei.c:4393
 __do_sys_unlink fs/namei.c:4441 [inline]
 __se_sys_unlink fs/namei.c:4439 [inline]
 __x64_sys_unlink+0x49/0x50 fs/namei.c:4439
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f5196975789
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc9b401ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5196975789
RDX: 00007f5196933e03 RSI: 0000000000000000 RDI: 0000000020000140
RBP: 00007f5196935020 R08: 0000000000000640 R09: 0000000000000000
R10: 00007ffc9b401bb0 R11: 0000000000000246 R12: 00007f51969350b0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
==================================================================

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Manager Title
2023/05/25 20:03 upstream 933174ae28ba 0513b3e6 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: wild-memory-access Read in hfsplus_bnode_dump
2023/05/25 19:47 upstream 933174ae28ba 0513b3e6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: wild-memory-access Read in hfsplus_bnode_dump
2023/05/10 04:20 upstream 1dc3731daf1f 30aa2a7e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: wild-memory-access Read in hfsplus_bnode_dump
2023/04/23 11:54 upstream 622322f53c6d 2b32bd34 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: wild-memory-access Read in hfsplus_bnode_dump
2023/04/22 23:27 upstream 2caeeb9d4a1b 2b32bd34 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: wild-memory-access Read in hfsplus_bnode_dump
2023/04/11 17:45 upstream 0d3eb744aed4 49faf98d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: wild-memory-access Read in hfsplus_bnode_dump
* Struck through repros no longer work on HEAD.