[syzbot ci] Re: genetlink: apply reject policy for split ops on the dispatch path
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syzbot ci
Mar 8, 2026, 9:19:24 AM (2 days ago) Mar 8
to alok.a...@oracle.com, and...@lunn.ch, da...@davemloft.net, edum...@google.com, ho...@kernel.org, ke...@kernel.org, ku...@kernel.org, linux-k...@vger.kernel.org, net...@vger.kernel.org, pab...@redhat.com, sh...@kernel.org, syz...@lists.linux.dev, syzkall...@googlegroups.com
syzbot ci has tested the following series
[v1] genetlink: apply reject policy for split ops on the dispatch path
https://lore.kernel.org/all/20260307204425...@kernel.org
* [PATCH net-next 1/2] genetlink: apply reject policy for split ops on the dispatch path
* [PATCH net-next 2/2] selftests: net: make sure that Netlink rejects unknown attrs in dump
and found the following issue:
KASAN: slab-out-of-bounds Read in devlink_nl_dumpit
Full report is available here:
https://ci.syzbot.org/series/cced225b-516e-4f54-b4f2-57afc46c5c2a
***
KASAN: slab-out-of-bounds Read in devlink_nl_dumpit
tree: net-next
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git
base: 0bcac7b11262557c990da1ac564d45777eb6b005
arch: amd64
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
config: https://ci.syzbot.org/builds/4ea10ec3-e985-401a-a2b5-87b89ca3a776/config
C repro: https://ci.syzbot.org/findings/c23aee43-2180-46d5-93cb-e8c1cbcb1c39/c_repro
syz repro: https://ci.syzbot.org/findings/c23aee43-2180-46d5-93cb-e8c1cbcb1c39/syz_repro
==================================================================
BUG: KASAN: slab-out-of-bounds in devlink_nl_dumpit+0x2a4/0x410 net/devlink/netlink.c:355
Read of size 8 at addr ffff88810a48eab0 by task syz.0.17/5954
CPU: 0 UID: 0 PID: 5954 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xba/0x230 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
devlink_nl_dumpit+0x2a4/0x410 net/devlink/netlink.c:355
genl_dumpit+0x10b/0x1b0 net/netlink/genetlink.c:1027
netlink_dump+0x722/0xe80 net/netlink/af_netlink.c:2325
__netlink_dump_start+0x5cb/0x7e0 net/netlink/af_netlink.c:2440
genl_family_rcv_msg_dumpit+0x213/0x310 net/netlink/genetlink.c:1076
genl_family_rcv_msg net/netlink/genetlink.c:1192 [inline]
genl_rcv_msg+0x5e8/0x7a0 net/netlink/genetlink.c:1210
netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0x972/0x9f0 net/socket.c:2591
___sys_sendmsg+0x2a5/0x360 net/socket.c:2645
__sys_sendmsg net/socket.c:2677 [inline]
__do_sys_sendmsg net/socket.c:2682 [inline]
__se_sys_sendmsg net/socket.c:2680 [inline]
__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2680
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6bf799c799
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:00007fff4b3c0b38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f6bf7c15fa0 RCX: 00007f6bf799c799
RDX: 0000000000000000 RSI: 0000200000001780 RDI: 0000000000000003
RBP: 00007f6bf7a32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6bf7c15fac R14: 00007f6bf7c15fa0 R15: 00007f6bf7c15fa0
</TASK>
Allocated by task 5954:
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:5238 [inline]
__kmalloc_noprof+0x35c/0x760 mm/slub.c:5250
kmalloc_noprof include/linux/slab.h:954 [inline]
genl_family_rcv_msg_attrs_parse+0xa3/0x2a0 net/netlink/genetlink.c:941
genl_start+0x180/0x6c0 net/netlink/genetlink.c:980
__netlink_dump_start+0x469/0x7e0 net/netlink/af_netlink.c:2431
genl_family_rcv_msg_dumpit+0x213/0x310 net/netlink/genetlink.c:1076
genl_family_rcv_msg net/netlink/genetlink.c:1192 [inline]
genl_rcv_msg+0x5e8/0x7a0 net/netlink/genetlink.c:1210
netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0x972/0x9f0 net/socket.c:2591
___sys_sendmsg+0x2a5/0x360 net/socket.c:2645
__sys_sendmsg net/socket.c:2677 [inline]
__do_sys_sendmsg net/socket.c:2682 [inline]
__se_sys_sendmsg net/socket.c:2680 [inline]
__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2680
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88810a48eaa0
which belongs to the cache kmalloc-16 of size 16
The buggy address is located 0 bytes to the right of
allocated 16-byte region [ffff88810a48eaa0, ffff88810a48eab0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10a48e
flags: 0x17ff00000000000(node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 017ff00000000000 ffff888100041640 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800800080 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 11308983860, free_ts 11289885463
create_dummy_stack mm/page_owner.c:103 [inline]
register_dummy_stack+0x98/0x100 mm/page_owner.c:109
init_page_owner+0x2e/0x600 mm/page_owner.c:127
invoke_init_callbacks mm/page_ext.c:152 [inline]
page_ext_init+0x500/0x540 mm/page_ext.c:490
mm_core_init+0x51/0x70 mm/mm_init.c:2735
page last free pid 1 tgid 1 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1433 [inline]
__free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978
___free_pages_bulk mm/kasan/shadow.c:333 [inline]
__kasan_populate_vmalloc_do mm/kasan/shadow.c:385 [inline]
__kasan_populate_vmalloc+0x137/0x1d0 mm/kasan/shadow.c:424
kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
alloc_vmap_area+0xd73/0x14b0 mm/vmalloc.c:2129
__get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3232
get_vm_area_caller+0x82/0xb0 mm/vmalloc.c:3283
__ioremap_caller+0x3d7/0x620 arch/x86/mm/ioremap.c:292
pcim_iomap+0xde/0x2b0 drivers/pci/devres.c:548
ahci_init_one+0x99e/0x34b0 drivers/ata/ahci.c:1973
local_pci_probe drivers/pci/pci-driver.c:323 [inline]
pci_call_probe drivers/pci/pci-driver.c:385 [inline]
__pci_device_probe drivers/pci/pci-driver.c:446 [inline]
pci_device_probe+0x41a/0xc70 drivers/pci/pci-driver.c:480
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x267/0xaf0 drivers/base/dd.c:661
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:803
driver_probe_device+0x4f/0x240 drivers/base/dd.c:833
__driver_attach+0x3e7/0x710 drivers/base/dd.c:1227
bus_for_each_dev+0x23b/0x2c0 drivers/base/bus.c:383
bus_add_driver+0x345/0x670 drivers/base/bus.c:715
driver_register+0x23a/0x320 drivers/base/driver.c:249
Memory state around the buggy address:
ffff88810a48e980: fa fb fc fc 00 00 fc fc fa fb fc fc fa fb fc fc
ffff88810a48ea00: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc
>ffff88810a48ea80: fa fb fc fc 00 00 fc fc 00 06 fc fc 00 00 fc fc
^
ffff88810a48eb00: fa fb fc fc 00 00 fc fc 00 00 fc fc fa fb fc fc
ffff88810a48eb80: 00 00 fc fc 00 00 fc fc fa fb fc fc 00 00 fc fc
==================================================================
***
If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syz...@syzkaller.appspotmail.com
---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzk...@googlegroups.com.
[v1] genetlink: apply reject policy for split ops on the dispatch path
https://lore.kernel.org/all/20260307204425...@kernel.org
* [PATCH net-next 1/2] genetlink: apply reject policy for split ops on the dispatch path
* [PATCH net-next 2/2] selftests: net: make sure that Netlink rejects unknown attrs in dump
and found the following issue:
KASAN: slab-out-of-bounds Read in devlink_nl_dumpit
Full report is available here:
https://ci.syzbot.org/series/cced225b-516e-4f54-b4f2-57afc46c5c2a
***
KASAN: slab-out-of-bounds Read in devlink_nl_dumpit
tree: net-next
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git
base: 0bcac7b11262557c990da1ac564d45777eb6b005
arch: amd64
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
config: https://ci.syzbot.org/builds/4ea10ec3-e985-401a-a2b5-87b89ca3a776/config
C repro: https://ci.syzbot.org/findings/c23aee43-2180-46d5-93cb-e8c1cbcb1c39/c_repro
syz repro: https://ci.syzbot.org/findings/c23aee43-2180-46d5-93cb-e8c1cbcb1c39/syz_repro
==================================================================
BUG: KASAN: slab-out-of-bounds in devlink_nl_dumpit+0x2a4/0x410 net/devlink/netlink.c:355
Read of size 8 at addr ffff88810a48eab0 by task syz.0.17/5954
CPU: 0 UID: 0 PID: 5954 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xba/0x230 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
devlink_nl_dumpit+0x2a4/0x410 net/devlink/netlink.c:355
genl_dumpit+0x10b/0x1b0 net/netlink/genetlink.c:1027
netlink_dump+0x722/0xe80 net/netlink/af_netlink.c:2325
__netlink_dump_start+0x5cb/0x7e0 net/netlink/af_netlink.c:2440
genl_family_rcv_msg_dumpit+0x213/0x310 net/netlink/genetlink.c:1076
genl_family_rcv_msg net/netlink/genetlink.c:1192 [inline]
genl_rcv_msg+0x5e8/0x7a0 net/netlink/genetlink.c:1210
netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0x972/0x9f0 net/socket.c:2591
___sys_sendmsg+0x2a5/0x360 net/socket.c:2645
__sys_sendmsg net/socket.c:2677 [inline]
__do_sys_sendmsg net/socket.c:2682 [inline]
__se_sys_sendmsg net/socket.c:2680 [inline]
__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2680
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6bf799c799
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:00007fff4b3c0b38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f6bf7c15fa0 RCX: 00007f6bf799c799
RDX: 0000000000000000 RSI: 0000200000001780 RDI: 0000000000000003
RBP: 00007f6bf7a32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6bf7c15fac R14: 00007f6bf7c15fa0 R15: 00007f6bf7c15fa0
</TASK>
Allocated by task 5954:
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:5238 [inline]
__kmalloc_noprof+0x35c/0x760 mm/slub.c:5250
kmalloc_noprof include/linux/slab.h:954 [inline]
genl_family_rcv_msg_attrs_parse+0xa3/0x2a0 net/netlink/genetlink.c:941
genl_start+0x180/0x6c0 net/netlink/genetlink.c:980
__netlink_dump_start+0x469/0x7e0 net/netlink/af_netlink.c:2431
genl_family_rcv_msg_dumpit+0x213/0x310 net/netlink/genetlink.c:1076
genl_family_rcv_msg net/netlink/genetlink.c:1192 [inline]
genl_rcv_msg+0x5e8/0x7a0 net/netlink/genetlink.c:1210
netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0x972/0x9f0 net/socket.c:2591
___sys_sendmsg+0x2a5/0x360 net/socket.c:2645
__sys_sendmsg net/socket.c:2677 [inline]
__do_sys_sendmsg net/socket.c:2682 [inline]
__se_sys_sendmsg net/socket.c:2680 [inline]
__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2680
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88810a48eaa0
which belongs to the cache kmalloc-16 of size 16
The buggy address is located 0 bytes to the right of
allocated 16-byte region [ffff88810a48eaa0, ffff88810a48eab0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10a48e
flags: 0x17ff00000000000(node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 017ff00000000000 ffff888100041640 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800800080 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 11308983860, free_ts 11289885463
create_dummy_stack mm/page_owner.c:103 [inline]
register_dummy_stack+0x98/0x100 mm/page_owner.c:109
init_page_owner+0x2e/0x600 mm/page_owner.c:127
invoke_init_callbacks mm/page_ext.c:152 [inline]
page_ext_init+0x500/0x540 mm/page_ext.c:490
mm_core_init+0x51/0x70 mm/mm_init.c:2735
page last free pid 1 tgid 1 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1433 [inline]
__free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978
___free_pages_bulk mm/kasan/shadow.c:333 [inline]
__kasan_populate_vmalloc_do mm/kasan/shadow.c:385 [inline]
__kasan_populate_vmalloc+0x137/0x1d0 mm/kasan/shadow.c:424
kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
alloc_vmap_area+0xd73/0x14b0 mm/vmalloc.c:2129
__get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3232
get_vm_area_caller+0x82/0xb0 mm/vmalloc.c:3283
__ioremap_caller+0x3d7/0x620 arch/x86/mm/ioremap.c:292
pcim_iomap+0xde/0x2b0 drivers/pci/devres.c:548
ahci_init_one+0x99e/0x34b0 drivers/ata/ahci.c:1973
local_pci_probe drivers/pci/pci-driver.c:323 [inline]
pci_call_probe drivers/pci/pci-driver.c:385 [inline]
__pci_device_probe drivers/pci/pci-driver.c:446 [inline]
pci_device_probe+0x41a/0xc70 drivers/pci/pci-driver.c:480
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x267/0xaf0 drivers/base/dd.c:661
__driver_probe_device+0x18c/0x320 drivers/base/dd.c:803
driver_probe_device+0x4f/0x240 drivers/base/dd.c:833
__driver_attach+0x3e7/0x710 drivers/base/dd.c:1227
bus_for_each_dev+0x23b/0x2c0 drivers/base/bus.c:383
bus_add_driver+0x345/0x670 drivers/base/bus.c:715
driver_register+0x23a/0x320 drivers/base/driver.c:249
Memory state around the buggy address:
ffff88810a48e980: fa fb fc fc 00 00 fc fc fa fb fc fc fa fb fc fc
ffff88810a48ea00: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc
>ffff88810a48ea80: fa fb fc fc 00 00 fc fc 00 06 fc fc 00 00 fc fc
^
ffff88810a48eb00: fa fb fc fc 00 00 fc fc 00 00 fc fc fa fb fc fc
ffff88810a48eb80: 00 00 fc fc 00 00 fc fc fa fb fc fc 00 00 fc fc
==================================================================
***
If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syz...@syzkaller.appspotmail.com
---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzk...@googlegroups.com.
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