Re: [PATCH net] infiniband: fix use-after-free when rename device name

From: Leon Romanovsky
Date: Mon Mar 10 2025 - 06:14:34 EST

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In reply to: Wang Liang: "[PATCH net] infiniband: fix use-after-free when rename device name"
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On Mon, Mar 10, 2025 at 02:45:16PM +0800, Wang Liang wrote:
> Syzbot reported a slab-use-after-free with the following call trace:
>
> ==================================================================
> BUG: KASAN: slab-use-after-free in nla_put+0xd3/0x150 lib/nlattr.c:1099
> Read of size 5 at addr ffff888140ea1c60 by task syz.0.988/10025
>
> CPU: 0 UID: 0 PID: 10025 Comm: syz.0.988 Not tainted 6.14.0-rc4-syzkaller-00859-gf77f12010f67 #0
> Hardware name: Google Compute Engine, BIOS Google 02/12/2025
> Call Trace:
> <TASK>
> __dump_stack lib/dump_stack.c:94 [inline]
> dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
> print_address_description mm/kasan/report.c:408 [inline]
> print_report+0x16e/0x5b0 mm/kasan/report.c:521
> kasan_report+0x143/0x180 mm/kasan/report.c:634
> kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
> __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
> nla_put+0xd3/0x150 lib/nlattr.c:1099
> nla_put_string include/net/netlink.h:1621 [inline]
> fill_nldev_handle+0x16e/0x200 drivers/infiniband/core/nldev.c:265
> rdma_nl_notify_event+0x561/0xef0 drivers/infiniband/core/nldev.c:2857
> ib_device_notify_register+0x22/0x230 drivers/infiniband/core/device.c:1344
> ib_register_device+0x1292/0x1460 drivers/infiniband/core/device.c:1460
> rxe_register_device+0x233/0x350 drivers/infiniband/sw/rxe/rxe_verbs.c:1540
> rxe_net_add+0x74/0xf0 drivers/infiniband/sw/rxe/rxe_net.c:550
> rxe_newlink+0xde/0x1a0 drivers/infiniband/sw/rxe/rxe.c:212
> nldev_newlink+0x5ea/0x680 drivers/infiniband/core/nldev.c:1795
> rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
> rdma_nl_rcv+0x6dd/0x9e0 drivers/infiniband/core/netlink.c:259
> netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
> netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1339
> netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1883
> sock_sendmsg_nosec net/socket.c:709 [inline]
> __sock_sendmsg+0x221/0x270 net/socket.c:724
> ____sys_sendmsg+0x53a/0x860 net/socket.c:2564
> ___sys_sendmsg net/socket.c:2618 [inline]
> __sys_sendmsg+0x269/0x350 net/socket.c:2650
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f42d1b8d169
> Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 ...
> RSP: 002b:00007f42d2960038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 00007f42d1da6320 RCX: 00007f42d1b8d169
> RDX: 0000000000000000 RSI: 00004000000002c0 RDI: 000000000000000c
> RBP: 00007f42d1c0e2a0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 0000000000000000 R14: 00007f42d1da6320 R15: 00007ffe399344a8
> </TASK>
>
> Allocated by task 10025:
> kasan_save_stack mm/kasan/common.c:47 [inline]
> kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
> poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
> __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394
> kasan_kmalloc include/linux/kasan.h:260 [inline]
> __do_kmalloc_node mm/slub.c:4294 [inline]
> __kmalloc_node_track_caller_noprof+0x28b/0x4c0 mm/slub.c:4313
> __kmemdup_nul mm/util.c:61 [inline]
> kstrdup+0x42/0x100 mm/util.c:81
> kobject_set_name_vargs+0x61/0x120 lib/kobject.c:274
> dev_set_name+0xd5/0x120 drivers/base/core.c:3468
> assign_name drivers/infiniband/core/device.c:1202 [inline]
> ib_register_device+0x178/0x1460 drivers/infiniband/core/device.c:1384
> rxe_register_device+0x233/0x350 drivers/infiniband/sw/rxe/rxe_verbs.c:1540
> rxe_net_add+0x74/0xf0 drivers/infiniband/sw/rxe/rxe_net.c:550
> rxe_newlink+0xde/0x1a0 drivers/infiniband/sw/rxe/rxe.c:212
> nldev_newlink+0x5ea/0x680 drivers/infiniband/core/nldev.c:1795
> rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
> rdma_nl_rcv+0x6dd/0x9e0 drivers/infiniband/core/netlink.c:259
> netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
> netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1339
> netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1883
> sock_sendmsg_nosec net/socket.c:709 [inline]
> __sock_sendmsg+0x221/0x270 net/socket.c:724
> ____sys_sendmsg+0x53a/0x860 net/socket.c:2564
> ___sys_sendmsg net/socket.c:2618 [inline]
> __sys_sendmsg+0x269/0x350 net/socket.c:2650
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> Freed by task 10035:
> kasan_save_stack mm/kasan/common.c:47 [inline]
> kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
> kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576
> poison_slab_object mm/kasan/common.c:247 [inline]
> __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
> kasan_slab_free include/linux/kasan.h:233 [inline]
> slab_free_hook mm/slub.c:2353 [inline]
> slab_free mm/slub.c:4609 [inline]
> kfree+0x196/0x430 mm/slub.c:4757
> kobject_rename+0x38f/0x410 lib/kobject.c:524
> device_rename+0x16a/0x200 drivers/base/core.c:4525
> ib_device_rename+0x270/0x710 drivers/infiniband/core/device.c:402
> nldev_set_doit+0x30e/0x4c0 drivers/infiniband/core/nldev.c:1146
> rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
> rdma_nl_rcv+0x6dd/0x9e0 drivers/infiniband/core/netlink.c:259
> netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
> netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1339
> netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1883
> sock_sendmsg_nosec net/socket.c:709 [inline]
> __sock_sendmsg+0x221/0x270 net/socket.c:724
> ____sys_sendmsg+0x53a/0x860 net/socket.c:2564
> ___sys_sendmsg net/socket.c:2618 [inline]
> __sys_sendmsg+0x269/0x350 net/socket.c:2650
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> This is because if rename device happens, the old name is freed in
> ib_device_rename() with lock, but fill_nldev_handle() may visit the dev
> name locklessly triggered by rxe_newlink().
>
> Fix this by add lock around rdma_nl_notify_event() in
> ib_device_notify_register().
>
> Reported-by: syzbot+f60349ba1f9f08df349f@xxxxxxxxxxxxxxxxxxxxxxxxx
> Closes: https://syzkaller.appspot.com/bug?extid=25bc6f0ed2b88b9eb9b8
> Fixes: 9cbed5aab5ae ("RDMA/nldev: Add support for RDMA monitoring")
> Signed-off-by: Wang Liang <wangliang74@xxxxxxxxxx>
> ---
> drivers/infiniband/core/device.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
> index 0ded91f056f3..4536621ada0d 100644
> --- a/drivers/infiniband/core/device.c
> +++ b/drivers/infiniband/core/device.c
> @@ -1341,7 +1341,9 @@ static void ib_device_notify_register(struct ib_device *device)
> u32 port;
> int ret;
>
> + down_write(&devices_rwsem);

The analysis looks correct to me, however this should be down_read(&devices_rwsem)
together with comment about possible race with RDMA netlink, which can change
internals of struct ib_device.

I wonder if this read semaphore should be hold for whole
ib_device_notify_register() function and not only for RDMA_REGISTER_EVENT event.

Thanks

> ret = rdma_nl_notify_event(device, 0, RDMA_REGISTER_EVENT);
> + up_write(&devices_rwsem);
> if (ret)
> return;
>
> --
> 2.34.1
>
>

Next message: Oleksij Rempel: "Re: [PATCH net-next v2 1/7] net: usb: lan78xx: Convert to PHYlink for improved PHY and MAC management"
Previous message: Tudor Ambarus: "Re: [PATCH 01/21] mtd: spinand: Use more specific naming for the reset op"
In reply to: Wang Liang: "[PATCH net] infiniband: fix use-after-free when rename device name"
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