* [syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet
@ 2026-09-21 15:53 syzbot
0 siblings, 0 replies; 2+ messages in thread
From: syzbot @ 2026-09-21 15:53 UTC (permalink / raw)
To: code, ecryptfs, linux-kernel, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 518e5b794c06 Merge tag 'for-7.3-rc3-tag' of git://git.kern..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17e5fff9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c3bddd52b22c2498
dashboard link: https://syzkaller.appspot.com/bug?extid=e4391e0d6e7c89b8c84e
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1015fff9580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10b73915580000
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-518e5b79.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5307a29f916b/vmlinux-518e5b79.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7d4c698a99b1/bzImage-518e5b79.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/4a20c8843682/mount_0.gz
fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=13e5fff9580000)
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e4391e0d6e7c89b8c84e@syzkaller.appspotmail.com
EXT4-fs (loop0): mounted filesystem 76b65be2-f6da-4727-8c75-0525a5b65a09 r/w without journal. Quota mode: none.
ext4 filesystem being mounted at /0/mnt supports timestamps until 2038-01-19 (0x7fffffff)
==================================================================
BUG: KASAN: slab-out-of-bounds in ecryptfs_write_tag_70_packet+0x1241/0x12e0 fs/ecryptfs/keystore.c:742
Read of size 4 at addr ffff88801225e298 by task syz.0.17/5512
CPU: 0 UID: 0 PID: 5512 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description+0x55/0x1e0 mm/kasan/report.c:378
print_report+0x58/0x70 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
ecryptfs_write_tag_70_packet+0x1241/0x12e0 fs/ecryptfs/keystore.c:742
ecryptfs_encrypt_filename fs/ecryptfs/crypto.c:1378 [inline]
ecryptfs_encrypt_and_encode_filename+0x576/0x1580 fs/ecryptfs/crypto.c:1789
ecryptfs_lookup+0x20e/0x780 fs/ecryptfs/inode.c:402
lookup_open+0x9e1/0x1a40 fs/namei.c:4528
open_last_lookups fs/namei.c:4767 [inline]
path_openat+0x677/0x1d60 fs/namei.c:4997
do_file_open+0x23e/0x4a0 fs/namei.c:5029
do_sys_openat2+0x115/0x200 fs/open.c:1417
do_sys_open fs/open.c:1423 [inline]
__do_sys_openat fs/open.c:1439 [inline]
__se_sys_openat fs/open.c:1434 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1434
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa04199e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff0259f088 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fa041c25fa0 RCX: 00007fa04199e159
RDX: 0000000000000800 RSI: 0000200000000680 RDI: ffffffffffffff9c
RBP: 00007fa041a3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa041c25fac R14: 00007fa041c25fa0 R15: 00007fa041c25fa0
</TASK>
Allocated by task 5512:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5414 [inline]
__kmalloc_noprof+0x36b/0x720 mm/slub.c:5439
_kmalloc_noprof include/linux/slab.h:995 [inline]
user_preparse+0x9e/0x160 security/keys/user_defined.c:67
__key_create_or_update+0x3a9/0xa80 security/keys/key.c:857
key_create_or_update+0x42/0x60 security/keys/key.c:1021
__do_sys_add_key security/keys/keyctl.c:134 [inline]
__se_sys_add_key+0x349/0x420 security/keys/keyctl.c:74
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88801225e000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 270 bytes to the right of
allocated 394-byte region [ffff88801225e000, ffff88801225e18a)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1225e
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b041c80 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b041c80 dead000000000100 dead000000000122
head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 00fff00000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5447, tgid 5447 (syz-executor), ts 113774270032
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871
prep_new_page mm/page_alloc.c:1879 [inline]
get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943
__alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436
alloc_slab_page mm/slub.c:3347 [inline]
allocate_slab+0x7d/0x620 mm/slub.c:3462
new_slab mm/slub.c:3513 [inline]
refill_objects+0x2d5/0x350 mm/slub.c:7417
refill_sheaf mm/slub.c:2885 [inline]
__pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774
alloc_from_pcs mm/slub.c:4850 [inline]
slab_alloc_node mm/slub.c:4984 [inline]
__do_kmalloc_node mm/slub.c:5413 [inline]
__kmalloc_noprof+0x47b/0x720 mm/slub.c:5439
_kmalloc_noprof include/linux/slab.h:995 [inline]
_kzalloc_noprof include/linux/slab.h:1312 [inline]
fib6_info_alloc+0x30/0xf0 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x149/0x890 net/ipv6/route.c:3833
ip6_route_add+0x49/0x1b0 net/ipv6/route.c:3962
addrconf_prefix_route+0x3a2/0x480 net/ipv6/addrconf.c:2504
inet6_addr_add+0x504/0xb50 net/ipv6/addrconf.c:3077
inet6_rtm_newaddr+0x9fc/0xe00 net/ipv6/addrconf.c:5095
rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7137
netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2575
netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline]
netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1364
page last free pid 5421 tgid 5421 ts 110085182085 stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1418 [inline]
__free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962
__tlb_remove_table_free mm/mmu_gather.c:228 [inline]
tlb_remove_table_rcu+0x85/0x100 mm/mmu_gather.c:291
rcu_do_batch kernel/rcu/tree.c:2650 [inline]
rcu_core+0x926/0x1260 kernel/rcu/tree.c:2919
handle_softirqs+0x226/0x860 kernel/softirq.c:645
__do_softirq kernel/softirq.c:679 [inline]
invoke_softirq kernel/softirq.c:519 [inline]
__irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758
irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
Memory state around the buggy address:
ffff88801225e180: 00 02 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88801225e200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801225e280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88801225e300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88801225e380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
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end of thread, other threads:[~2026-09-22 4:38 UTC | newest]
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2026-09-22 4:38 ` [syzbot] [ecryptfs?] KASAN: slab-out-of-bounds Read in ecryptfs_write_tag_70_packet syzbot
2026-09-21 15:53 syzbot
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