| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <CAGfirfc70aJ7YUa02ObbxPfkH1u6B=BPZpUXDAg2FU16aKvL1Q@mail.gmail.com>
Date: Mon, 26 Jan 2026 13:30:14 +0900
From: 김강민 <km.kim1503@...il.com>
To: davem@...emloft.net, Eric Dumazet <edumazet@...gle.com>,
Jamal Hadi Salim <jhs@...atatu.com>, jiri@...nulli.us, kuba@...nel.org,
netdev@...r.kernel.org, pabeni@...hat.com, xiyou.wangcong@...il.com,
horms@...nel.org
Cc: syzkaller@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [BUG] KASAN: slab-use-after-free Read in u32_classify
Apologies, I set the wrong title and KASAN report. The root cause is
out-of-bounds, not use-after-free. Please find the correct KASAN
report below.
KASAN report
==================================================================
BUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0
net/sched/cls_u32.c:221
Read of size 4 at addr ffff88812264f010 by task test/301
CPU: 0 UID: 0 PID: 301 Comm: test Not tainted 6.19.0-rc7 #11 PREEMPT(full)
Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS
1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x7b/0xa0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xd0/0x660 mm/kasan/report.c:482
kasan_report+0xce/0x100 mm/kasan/report.c:595
u32_classify+0x1180/0x11b0 net/sched/cls_u32.c:221
tc_classify include/net/tc_wrapper.h:197 [inline]
__tcf_classify net/sched/cls_api.c:1764 [inline]
tcf_classify+0x6dd/0x11d0 net/sched/cls_api.c:1860
htb_classify net/sched/sch_htb.c:245 [inline]
htb_enqueue+0x31e/0xf10 net/sched/sch_htb.c:625
dev_qdisc_enqueue+0x45/0x160 net/core/dev.c:4147
__dev_xmit_skb net/core/dev.c:4262 [inline]
__dev_queue_xmit+0x1eea/0x3060 net/core/dev.c:4798
dev_queue_xmit include/linux/netdevice.h:3381 [inline]
neigh_hh_output include/net/neighbour.h:540 [inline]
neigh_output include/net/neighbour.h:554 [inline]
ip_finish_output2+0xdd2/0x1710 net/ipv4/ip_output.c:237
__ip_finish_output.part.0+0x182/0x2f0 net/ipv4/ip_output.c:315
__ip_finish_output net/ipv4/ip_output.c:444 [inline]
ip_finish_output net/ipv4/ip_output.c:325 [inline]
NF_HOOK_COND include/linux/netfilter.h:307 [inline]
ip_output+0x288/0x510 net/ipv4/ip_output.c:438
dst_output include/net/dst.h:464 [inline]
ip_local_out net/ipv4/ip_output.c:131 [inline]
ip_send_skb net/ipv4/ip_output.c:1508 [inline]
ip_push_pending_frames+0x1ad/0x210 net/ipv4/ip_output.c:1528
icmp_push_reply+0x2c3/0x3e0 net/ipv4/icmp.c:395
__icmp_send+0xe93/0x2040 net/ipv4/icmp.c:972
icmp_send include/net/icmp.h:43 [inline]
__udp4_lib_rcv+0xfbc/0x2660 net/ipv4/udp.c:2741
ip_protocol_deliver_rcu+0x196/0x380 net/ipv4/ip_input.c:207
ip_local_deliver_finish+0x348/0x4d0 net/ipv4/ip_input.c:241
NF_HOOK include/linux/netfilter.h:318 [inline]
NF_HOOK include/linux/netfilter.h:312 [inline]
ip_local_deliver+0x1a0/0x2f0 net/ipv4/ip_input.c:262
dst_input include/net/dst.h:474 [inline]
ip_rcv_finish net/ipv4/ip_input.c:453 [inline]
NF_HOOK include/linux/netfilter.h:318 [inline]
NF_HOOK include/linux/netfilter.h:312 [inline]
ip_rcv+0x352/0x3d0 net/ipv4/ip_input.c:573
__netif_receive_skb_one_core+0x197/0x1e0 net/core/dev.c:6152
__netif_receive_skb+0x1f/0x110 net/core/dev.c:6265
process_backlog+0x210/0x670 net/core/dev.c:6617
__napi_poll+0xa4/0x590 net/core/dev.c:7681
napi_poll net/core/dev.c:7744 [inline]
net_rx_action+0xa0e/0xf60 net/core/dev.c:7896
handle_softirqs+0x18c/0x530 kernel/softirq.c:622
do_softirq kernel/softirq.c:523 [inline]
do_softirq+0x3b/0x60 kernel/softirq.c:510
</IRQ>
<TASK>
__local_bh_enable_ip+0x61/0x70 kernel/softirq.c:450
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:936 [inline]
__dev_queue_xmit+0x6c0/0x3060 net/core/dev.c:4859
dev_queue_xmit include/linux/netdevice.h:3381 [inline]
neigh_resolve_output net/core/neighbour.c:1594 [inline]
neigh_resolve_output+0x42e/0x790 net/core/neighbour.c:1574
neigh_output include/net/neighbour.h:556 [inline]
ip_finish_output2+0x63a/0x1710 net/ipv4/ip_output.c:237
__ip_finish_output.part.0+0x182/0x2f0 net/ipv4/ip_output.c:315
__ip_finish_output net/ipv4/ip_output.c:444 [inline]
ip_finish_output net/ipv4/ip_output.c:325 [inline]
NF_HOOK_COND include/linux/netfilter.h:307 [inline]
ip_output+0x288/0x510 net/ipv4/ip_output.c:438
dst_output include/net/dst.h:464 [inline]
ip_local_out net/ipv4/ip_output.c:131 [inline]
ip_send_skb+0x160/0x1b0 net/ipv4/ip_output.c:1508
udp_send_skb+0x6d6/0x1000 net/ipv4/udp.c:1195
udp_sendmsg+0x1463/0x1eb0 net/ipv4/udp.c:1484
inet_sendmsg+0xfa/0x140 net/ipv4/af_inet.c:859
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
sock_write_iter+0x493/0x5b0 net/socket.c:1195
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x657/0xd30 fs/read_write.c:686
ksys_write+0x1b2/0x200 fs/read_write.c:738
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xa4/0x320 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f53a5175513
Code: 8b 15 81 29 0e 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f
1f 00 64 8b 04 25 18 00 00 08
RSP: 002b:00007ffc8dde8d08 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f53a5175513
RDX: 0000000000000040 RSI: 00007ffc8dde8d40 RDI: 0000000000000003
RBP: 00007ffc8dde8da0 R08: 0000000000000004 R09: 0000000000000000
R10: fffffffffffffd8d R11: 0000000000000246 R12: 000055ca02b4d0f0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
The buggy address belongs to the object at ffff88812264f000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 16 bytes inside of
allocated 512-byte region [ffff88812264f000, ffff88812264f200)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12264c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x200000000000040(head|node=0|zone=2)
page_type: f5(slab)
raw: 0200000000000040 ffff888100041c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 0200000000000040 ffff888100041c80 dead000000000122 0000000000000000
head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 0200000000000002 ffffea0004899301 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88812264ef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88812264ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88812264f000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88812264f080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88812264f100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
2026년 1월 26일 (월) PM 1:15, 김강민 <km.kim1503@...il.com>님이 작성:
>
> Dear Linux kernel developers and maintainers,
> Using a modified version of syzkaller, I identified a new bug and
> refined the PoC, and the bug-related information is attached
> below.Please let me know if you need any further information.
>
> Summary
>
> When configuring u32 classifier, the type for hoff in sel allows
> negative values. This leads to an Out-of-Bounds read during subsequent
> processing of classify.
>
> P.S. If the memory at the Out-of-Bounds access point has already been
> freed, KASAN may detect this as a Use-After-Free.
>
> Keywords
> - net/sched
>
> Kernel Info
> Version: (Output of /proc/version)
> - Linux version Linux version 6.19.0-rc7
> Commit: (Git hash if applicable)
> - 63804fed149a6750ffd28610c5c1c98cce6bd377
>
>
> Description(Root Cause)
> ```
> TC_INDIRECT_SCOPE int u32_classify(struct sk_buff *skb,
> const struct tcf_proto *tp,
> struct tcf_result *res)
> {
> struct {
> struct tc_u_knode *knode;
> unsigned int off;
> } stack[TC_U32_MAXDEPTH];
>
> struct tc_u_hnode *ht = rcu_dereference_bh(tp->root);
> unsigned int off = skb_network_offset(skb);
> struct tc_u_knode *n;
> int sdepth = 0;
> int off2 = 0;
> int sel = 0;
> #ifdef CONFIG_CLS_U32_PERF
> int j;
> #endif
> int i, r;
>
> next_ht:
> n = rcu_dereference_bh(ht->ht[sel]);
>
> next_knode:
> if (n) {
> ...
> if (ht->divisor) {
> __be32 *data, hdata;
>
> data = skb_header_pointer(skb, off + n->sel.hoff, 4, // [1]
> &hdata);
> if (!data)
> goto out;
> sel = ht->divisor & u32_hash_fold(*data, &n->sel, // [2]
> n->fshift);
> }
> ...
> }
>
> ...
> return -1;
> }
> ```
> n->sel.hoff is a user-controllable value of type short. Since no
> additional validation exists before reaching [1], off + n->sel.hoff
> can become negative, causing data to point to an address before
> skb→head. In the PoC, off is 0xe and n->sel.hoff is 0xf000 (-4096 as a
> signed short), resulting in skb_header_pointer()'s second argument
> being -4082.
>
> ```
> static inline void * __must_check
> __skb_header_pointer(const struct sk_buff *skb, int offset, int len,
> const void *data, int hlen, void *buffer)
> {
> if (likely(hlen - offset >= len))
> return (void *)data + offset; // [3]
>
> if (!skb || unlikely(skb_copy_bits(skb, offset, buffer, len) < 0))
> return NULL;
>
> return buffer;
> }
> ```
> Since offset is set to -4082 at [3], data - 4082 is returned and
> stored in data, resulting in an Out-of-Bounds condition that exceeds
> the intended range.
> Subsequently, at [2], this data value is used, triggering an Out-of-Bounds read.
>
>
> Kasan Report
> ==================================================================
> BUG: KASAN: slab-use-after-free in u32_classify+0x1180/0x11b0
> net/sched/cls_u32.c:221
> Read of size 4 at addr ffff888103af9d90 by task test/315
>
> CPU: 1 UID: 0 PID: 315 Comm: test Not tainted 6.19.0-rc7 #11 PREEMPT(full)
> Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS
> 1.16.3-debian-1.16.3-2 04/01/2014
> Call Trace:
> <IRQ>
> __dump_stack lib/dump_stack.c:94 [inline]
> dump_stack_lvl+0x7b/0xa0 lib/dump_stack.c:120
> print_address_description mm/kasan/report.c:378 [inline]
> print_report+0xd0/0x660 mm/kasan/report.c:482
> kasan_report+0xce/0x100 mm/kasan/report.c:595
> u32_classify+0x1180/0x11b0 net/sched/cls_u32.c:221
> tc_classify include/net/tc_wrapper.h:197 [inline]
> __tcf_classify net/sched/cls_api.c:1764 [inline]
> tcf_classify+0x6dd/0x11d0 net/sched/cls_api.c:1860
> htb_classify net/sched/sch_htb.c:245 [inline]
> htb_enqueue+0x31e/0xf10 net/sched/sch_htb.c:625
> dev_qdisc_enqueue+0x45/0x160 net/core/dev.c:4147
> __dev_xmit_skb net/core/dev.c:4262 [inline]
> __dev_queue_xmit+0x1eea/0x3060 net/core/dev.c:4798
> dev_queue_xmit include/linux/netdevice.h:3381 [inline]
> neigh_hh_output include/net/neighbour.h:540 [inline]
> neigh_output include/net/neighbour.h:554 [inline]
> ip_finish_output2+0xdd2/0x1710 net/ipv4/ip_output.c:237
> __ip_finish_output.part.0+0x182/0x2f0 net/ipv4/ip_output.c:315
> __ip_finish_output net/ipv4/ip_output.c:444 [inline]
> ip_finish_output net/ipv4/ip_output.c:325 [inline]
> NF_HOOK_COND include/linux/netfilter.h:307 [inline]
> ip_output+0x288/0x510 net/ipv4/ip_output.c:438
> dst_output include/net/dst.h:464 [inline]
> ip_local_out net/ipv4/ip_output.c:131 [inline]
> ip_send_skb net/ipv4/ip_output.c:1508 [inline]
> ip_push_pending_frames+0x1ad/0x210 net/ipv4/ip_output.c:1528
> icmp_push_reply+0x2c3/0x3e0 net/ipv4/icmp.c:395
> __icmp_send+0xe93/0x2040 net/ipv4/icmp.c:972
> icmp_send include/net/icmp.h:43 [inline]
> __udp4_lib_rcv+0xfbc/0x2660 net/ipv4/udp.c:2741
> ip_protocol_deliver_rcu+0x196/0x380 net/ipv4/ip_input.c:207
> ip_local_deliver_finish+0x348/0x4d0 net/ipv4/ip_input.c:241
> NF_HOOK include/linux/netfilter.h:318 [inline]
> NF_HOOK include/linux/netfilter.h:312 [inline]
> ip_local_deliver+0x1a0/0x2f0 net/ipv4/ip_input.c:262
> dst_input include/net/dst.h:474 [inline]
> ip_rcv_finish net/ipv4/ip_input.c:453 [inline]
> NF_HOOK include/linux/netfilter.h:318 [inline]
> NF_HOOK include/linux/netfilter.h:312 [inline]
> ip_rcv+0x352/0x3d0 net/ipv4/ip_input.c:573
> __netif_receive_skb_one_core+0x197/0x1e0 net/core/dev.c:6152
> __netif_receive_skb+0x1f/0x110 net/core/dev.c:6265
> process_backlog+0x210/0x670 net/core/dev.c:6617
> __napi_poll+0xa4/0x590 net/core/dev.c:7681
> napi_poll net/core/dev.c:7744 [inline]
> net_rx_action+0xa0e/0xf60 net/core/dev.c:7896
> handle_softirqs+0x18c/0x530 kernel/softirq.c:622
> do_softirq kernel/softirq.c:523 [inline]
> do_softirq+0x3b/0x60 kernel/softirq.c:510
> </IRQ>
> <TASK>
> __local_bh_enable_ip+0x61/0x70 kernel/softirq.c:450
> local_bh_enable include/linux/bottom_half.h:33 [inline]
> rcu_read_unlock_bh include/linux/rcupdate.h:936 [inline]
> __dev_queue_xmit+0x6c0/0x3060 net/core/dev.c:4859
> dev_queue_xmit include/linux/netdevice.h:3381 [inline]
> neigh_hh_output include/net/neighbour.h:540 [inline]
> neigh_output include/net/neighbour.h:554 [inline]
> ip_finish_output2+0xdd2/0x1710 net/ipv4/ip_output.c:237
> __ip_finish_output.part.0+0x182/0x2f0 net/ipv4/ip_output.c:315
> __ip_finish_output net/ipv4/ip_output.c:444 [inline]
> ip_finish_output net/ipv4/ip_output.c:325 [inline]
> NF_HOOK_COND include/linux/netfilter.h:307 [inline]
> ip_output+0x288/0x510 net/ipv4/ip_output.c:438
> dst_output include/net/dst.h:464 [inline]
> ip_local_out net/ipv4/ip_output.c:131 [inline]
> ip_send_skb+0x160/0x1b0 net/ipv4/ip_output.c:1508
> udp_send_skb+0x6d6/0x1000 net/ipv4/udp.c:1195
> udp_sendmsg+0x1463/0x1eb0 net/ipv4/udp.c:1484
> inet_sendmsg+0xfa/0x140 net/ipv4/af_inet.c:859
> sock_sendmsg_nosec net/socket.c:727 [inline]
> __sock_sendmsg net/socket.c:742 [inline]
> sock_write_iter+0x493/0x5b0 net/socket.c:1195
> new_sync_write fs/read_write.c:593 [inline]
> vfs_write+0x657/0xd30 fs/read_write.c:686
> ksys_write+0x1b2/0x200 fs/read_write.c:738
> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> do_syscall_64+0xa4/0x320 arch/x86/entry/syscall_64.c:94
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f2e77de9513
> Code: 8b 15 81 29 0e 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f
> 1f 00 64 8b 04 25 18 00 00 00
> RSP: 002b:00007ffef12b6668 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2e77de9513
> RDX: 0000000000000040 RSI: 00007ffef12b66a0 RDI: 0000000000000003
> RBP: 00007ffef12b6700 R08: 0000000000000004 R09: 0000000000000000
> R10: fffffffffffffd8d R11: 0000000000000246 R12: 000055fef9c660f0
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> </TASK>
>
> Allocated by task 1:
> kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
> kasan_save_track+0x14/0x30 mm/kasan/common.c:78
> unpoison_slab_object mm/kasan/common.c:340 [inline]
> __kasan_slab_alloc+0x6e/0x70 mm/kasan/common.c:366
> kasan_slab_alloc include/linux/kasan.h:253 [inline]
> slab_post_alloc_hook mm/slub.c:4953 [inline]
> slab_alloc_node mm/slub.c:5263 [inline]
> kmem_cache_alloc_node_noprof+0x13b/0x4d0 mm/slub.c:5315
> kmalloc_reserve+0x15d/0x270 net/core/skbuff.c:586
> __alloc_skb+0x13b/0x390 net/core/skbuff.c:690
> alloc_skb include/linux/skbuff.h:1383 [inline]
> nlmsg_new include/net/netlink.h:1055 [inline]
> mpls_netconf_notify_devconf+0x41/0xf0 net/mpls/af_mpls.c:1205
> mpls_dev_sysctl_register+0x1c4/0x2a0 net/mpls/af_mpls.c:1441
> mpls_add_dev net/mpls/af_mpls.c:1490 [inline]
> mpls_dev_notify+0x342/0x670 net/mpls/af_mpls.c:1635
> call_netdevice_notifier net/core/dev.c:1884 [inline]
> call_netdevice_register_notifiers net/core/dev.c:1892 [inline]
> call_netdevice_register_net_notifiers+0x15d/0x4c0 net/core/dev.c:1923
> register_netdevice_notifier+0xd7/0x230 net/core/dev.c:1979
> mpls_init+0x3a/0x110 net/mpls/af_mpls.c:2827
> do_one_initcall+0xb2/0x3a0 init/main.c:1378
> do_initcall_level init/main.c:1440 [inline]
> do_initcalls init/main.c:1456 [inline]
> do_basic_setup init/main.c:1475 [inline]
> kernel_init_freeable+0x461/0x780 init/main.c:1688
> kernel_init+0x1f/0x250 init/main.c:1578
> ret_from_fork+0x378/0x490 arch/x86/kernel/process.c:158
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
>
> Freed by task 1:
> kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
> kasan_save_track+0x14/0x30 mm/kasan/common.c:78
> kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584
> poison_slab_object mm/kasan/common.c:253 [inline]
> __kasan_slab_free+0x43/0x70 mm/kasan/common.c:285
> kasan_slab_free include/linux/kasan.h:235 [inline]
> slab_free_hook mm/slub.c:2540 [inline]
> slab_free mm/slub.c:6674 [inline]
> kmem_cache_free+0xcc/0x4c0 mm/slub.c:6785
> skb_kfree_head net/core/skbuff.c:1066 [inline]
> skb_kfree_head net/core/skbuff.c:1063 [inline]
> skb_free_head+0x19d/0x230 net/core/skbuff.c:1080
> skb_release_data+0x4ac/0x670 net/core/skbuff.c:1107
> skb_release_all net/core/skbuff.c:1182 [inline]
> __kfree_skb net/core/skbuff.c:1196 [inline]
> consume_skb net/core/skbuff.c:1429 [inline]
> consume_skb+0xc7/0x220 net/core/skbuff.c:1423
> netlink_broadcast_filtered+0x379/0xd50 net/netlink/af_netlink.c:1535
> nlmsg_multicast_filtered include/net/netlink.h:1165 [inline]
> nlmsg_multicast include/net/netlink.h:1184 [inline]
> nlmsg_notify+0x8d/0x1c0 net/netlink/af_netlink.c:2593
> mpls_netconf_notify_devconf+0x8f/0xf0 net/mpls/af_mpls.c:1217
> mpls_dev_sysctl_register+0x1c4/0x2a0 net/mpls/af_mpls.c:1441
> mpls_add_dev net/mpls/af_mpls.c:1490 [inline]
> mpls_dev_notify+0x342/0x670 net/mpls/af_mpls.c:1635
> call_netdevice_notifier net/core/dev.c:1884 [inline]
> call_netdevice_register_notifiers net/core/dev.c:1892 [inline]
> call_netdevice_register_net_notifiers+0x15d/0x4c0 net/core/dev.c:1923
> register_netdevice_notifier+0xd7/0x230 net/core/dev.c:1979
> mpls_init+0x3a/0x110 net/mpls/af_mpls.c:2827
> do_one_initcall+0xb2/0x3a0 init/main.c:1378
> do_initcall_level init/main.c:1440 [inline]
> do_initcalls init/main.c:1456 [inline]
> do_basic_setup init/main.c:1475 [inline]
> kernel_init_freeable+0x461/0x780 init/main.c:1688
> kernel_init+0x1f/0x250 init/main.c:1578
> ret_from_fork+0x378/0x490 arch/x86/kernel/process.c:158
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
>
> The buggy address belongs to the object at ffff888103af9d40
> which belongs to the cache skbuff_small_head of size 704
> The buggy address is located 80 bytes inside of
> freed 704-byte region [ffff888103af9d40, ffff888103afa000)
>
> The buggy address belongs to the physical page:
> page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103af8
> head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
> flags: 0x200000000000040(head|node=0|zone=2)
> page_type: f5(slab)
> raw: 0200000000000040 ffff888100919280 dead000000000100 dead000000000122
> raw: 0000000000000000 0000000080130013 00000000f5000000 0000000000000000
> head: 0200000000000040 ffff888100919280 dead000000000100 dead000000000122
> head: 0000000000000000 0000000080130013 00000000f5000000 0000000000000000
> head: 0200000000000002 ffffea00040ebe01 00000000ffffffff 00000000ffffffff
> head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
> page dumped because: kasan: bad access detected
>
> Memory state around the buggy address:
> ffff888103af9c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
> ffff888103af9d00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
> >ffff888103af9d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ^
> ffff888103af9e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff888103af9e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ==================================================================
Powered by blists - more mailing lists