Hello,
syzbot found the following issue on:
HEAD commit: 7eaef76fbc46 Linux 6.1.20
git tree: linux-6.1.y
console output:
https://syzkaller.appspot.com/x/log.txt?x=11a2a131c80000
kernel config:
https://syzkaller.appspot.com/x/.config?x=28c36fe4d02f8c88
dashboard link:
https://syzkaller.appspot.com/bug?extid=6ec6424561c8244a8407
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image:
https://storage.googleapis.com/syzbot-assets/610a00ba4375/disk-7eaef76f.raw.xz
vmlinux:
https://storage.googleapis.com/syzbot-assets/57c1310f9a30/vmlinux-7eaef76f.xz
kernel image:
https://storage.googleapis.com/syzbot-assets/81999f717d3b/bzImage-7eaef76f.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+6ec642...@syzkaller.appspotmail.com
loop3: detected capacity change from 0 to 1024
==================================================================
BUG: KASAN: slab-out-of-bounds in hfsplus_uni2asc+0x576/0x11f0 fs/hfsplus/unicode.c:179
Read of size 2 at addr ffff88807b77b40c by task syz-executor.3/29285
CPU: 0 PID: 29285 Comm: syz-executor.3 Not tainted 6.1.20-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_address_description mm/kasan/report.c:284 [inline]
print_report+0x15f/0x4f0 mm/kasan/report.c:395
kasan_report+0x136/0x160 mm/kasan/report.c:495
hfsplus_uni2asc+0x576/0x11f0 fs/hfsplus/unicode.c:179
hfsplus_readdir+0x922/0x12c0 fs/hfsplus/dir.c:207
iterate_dir+0x224/0x560
__do_sys_getdents64 fs/readdir.c:369 [inline]
__se_sys_getdents64+0x209/0x4f0 fs/readdir.c:354
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f0dcec8c0f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0dcfa09168 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f0dcedabf80 RCX: 00007f0dcec8c0f9
RDX: 0000000000000067 RSI: 0000000020000540 RDI: 0000000000000003
RBP: 00007f0dcece7b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffac9c1bcf R14: 00007f0dcfa09300 R15: 0000000000022000
</TASK>
Allocated by task 29285:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slab_common.c:955 [inline]
__kmalloc+0xaf/0x1a0 mm/slab_common.c:968
kmalloc include/linux/slab.h:558 [inline]
hfsplus_find_init+0x81/0x1c0 fs/hfsplus/bfind.c:21
hfsplus_readdir+0x207/0x12c0 fs/hfsplus/dir.c:144
iterate_dir+0x224/0x560
__do_sys_getdents64 fs/readdir.c:369 [inline]
__se_sys_getdents64+0x209/0x4f0 fs/readdir.c:354
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Last potentially related work creation:
kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486
call_rcu+0x163/0xa10 kernel/rcu/tree.c:2798
netlink_release+0x1384/0x17f0 net/netlink/af_netlink.c:817
__sock_release net/socket.c:652 [inline]
sock_close+0xcd/0x230 net/socket.c:1370
__fput+0x3b7/0x890 fs/file_table.c:320
task_work_run+0x246/0x300 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:203
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x60/0x2d0 kernel/entry/common.c:296
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Second to last potentially related work creation:
kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486
call_rcu+0x163/0xa10 kernel/rcu/tree.c:2798
netlink_release+0x1384/0x17f0 net/netlink/af_netlink.c:817
__sock_release net/socket.c:652 [inline]
sock_close+0xcd/0x230 net/socket.c:1370
__fput+0x3b7/0x890 fs/file_table.c:320
task_work_run+0x246/0x300 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:203
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x60/0x2d0 kernel/entry/common.c:296
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
The buggy address belongs to the object at ffff88807b77b000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1036 bytes inside of
2048-byte region [ffff88807b77b000, ffff88807b77b800)
The buggy address belongs to the physical page:
page:ffffea0001edde00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7b778
head:ffffea0001edde00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0000745a00 dead000000000002 ffff888012442000
raw: 0000000000000000 0000000080080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 3775, tgid 3775 (kworker/0:10), ts 259649723665, free_ts 259616366060
prep_new_page mm/page_alloc.c:2539 [inline]
get_page_from_freelist+0x3573/0x3700 mm/page_alloc.c:4291
__alloc_pages+0x28d/0x7e0 mm/page_alloc.c:5558
alloc_slab_page+0x6a/0x150 mm/slub.c:1794
allocate_slab mm/slub.c:1939 [inline]
new_slab+0x84/0x2d0 mm/slub.c:1992
___slab_alloc+0xa71/0x1080 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
__kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437
__do_kmalloc_node mm/slab_common.c:954 [inline]
__kmalloc_node_track_caller+0x9c/0x190 mm/slab_common.c:975
kmalloc_reserve net/core/skbuff.c:437 [inline]
__alloc_skb+0x126/0x620 net/core/skbuff.c:509
alloc_skb include/linux/skbuff.h:1267 [inline]
alloc_skb_with_frags+0xa4/0x740 net/core/skbuff.c:6128
sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2721
sock_alloc_send_skb include/net/sock.h:1884 [inline]
mld_newpack+0x1c0/0xa90 net/ipv6/mcast.c:1748
add_grhead net/ipv6/mcast.c:1851 [inline]
add_grec+0x1492/0x19a0 net/ipv6/mcast.c:1989
mld_send_initial_cr+0x20f/0x3a0 net/ipv6/mcast.c:2236
ipv6_mc_dad_complete+0x84/0x390 net/ipv6/mcast.c:2247
addrconf_dad_completed+0x678/0xca0 net/ipv6/addrconf.c:4233
addrconf_dad_work+0xd8e/0x16b0
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1459 [inline]
free_pcp_prepare mm/page_alloc.c:1509 [inline]
free_unref_page_prepare+0xfe1/0x1190 mm/page_alloc.c:3387
free_unref_page+0x98/0x570 mm/page_alloc.c:3483
free_slab mm/slub.c:2031 [inline]
discard_slab mm/slub.c:2037 [inline]
__unfreeze_partials+0x1b7/0x210 mm/slub.c:2586
put_cpu_partial+0x116/0x180 mm/slub.c:2662
qlist_free_all+0x22/0x60 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook+0x50/0x370 mm/slab.h:737
slab_alloc_node mm/slub.c:3398 [inline]
kmem_cache_alloc_node+0x142/0x2a0 mm/slub.c:3443
__alloc_skb+0xde/0x620 net/core/skbuff.c:497
alloc_skb include/linux/skbuff.h:1267 [inline]
alloc_skb_with_frags+0xa4/0x740 net/core/skbuff.c:6128
sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2721
sock_alloc_send_skb include/net/sock.h:1884 [inline]
mld_newpack+0x1c0/0xa90 net/ipv6/mcast.c:1748
add_grhead net/ipv6/mcast.c:1851 [inline]
add_grec+0x1492/0x19a0 net/ipv6/mcast.c:1989
mld_send_initial_cr+0x20f/0x3a0 net/ipv6/mcast.c:2236
mld_dad_work+0x40/0x400 net/ipv6/mcast.c:2262
Memory state around the buggy address:
ffff88807b77b300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88807b77b380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88807b77b400: 00 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88807b77b480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88807b77b500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================