* [PATCH v2 net] RDMA/core: fix UAF in ib_get_eth_speed
@ 2024-03-28 11:32 Denis Kirjanov
2024-03-28 11:51 ` Eric Dumazet
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: Denis Kirjanov @ 2024-03-28 11:32 UTC (permalink / raw)
To: netdev; +Cc: edumazet, jgg, leon, Denis Kirjanov, syzbot+5fe14f2ff4ccbace9a26
A call to ib_device_get_netdev from ib_get_eth_speed
may lead to a race condition while accessing a netdevice
instance since we don't hold the rtnl lock while checking
the registration state:
if (res && res->reg_state != NETREG_REGISTERED) {
v2: unlock rtnl on error patch
Reported-by: syzbot+5fe14f2ff4ccbace9a26@syzkaller.appspotmail.com
Fixes: d41861942fc55 ("IB/core: Add generic function to extract IB speed from netdev")
Signed-off-by: Denis Kirjanov <dkirjanov@suse.de>
---
drivers/infiniband/core/verbs.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index 94a7f3b0c71c..9c09d8c328b4 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -1976,11 +1976,13 @@ int ib_get_eth_speed(struct ib_device *dev, u32 port_num, u16 *speed, u8 *width)
if (rdma_port_get_link_layer(dev, port_num) != IB_LINK_LAYER_ETHERNET)
return -EINVAL;
+ rtnl_lock();
netdev = ib_device_get_netdev(dev, port_num);
- if (!netdev)
+ if (!netdev) {
+ rtnl_unlock()
return -ENODEV;
+ }
- rtnl_lock();
rc = __ethtool_get_link_ksettings(netdev, &lksettings);
rtnl_unlock();
--
2.30.2
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v2 net] RDMA/core: fix UAF in ib_get_eth_speed
2024-03-28 11:32 [PATCH v2 net] RDMA/core: fix UAF in ib_get_eth_speed Denis Kirjanov
@ 2024-03-28 11:51 ` Eric Dumazet
2024-03-28 12:18 ` Denis Kirjanov
2024-03-28 11:58 ` Ratheesh Kannoth
2024-03-28 12:01 ` Naveen Mamindlapalli
2 siblings, 1 reply; 5+ messages in thread
From: Eric Dumazet @ 2024-03-28 11:51 UTC (permalink / raw)
To: Denis Kirjanov
Cc: netdev, jgg, leon, Denis Kirjanov, syzbot+5fe14f2ff4ccbace9a26
On Thu, Mar 28, 2024 at 12:32 PM Denis Kirjanov <kirjanov@gmail.com> wrote:
>
> A call to ib_device_get_netdev from ib_get_eth_speed
> may lead to a race condition while accessing a netdevice
> instance since we don't hold the rtnl lock while checking
> the registration state:
> if (res && res->reg_state != NETREG_REGISTERED) {
>
> v2: unlock rtnl on error patch
>
What about other callers of ib_device_get_netdev() ?
It seems they also could be racy.
> Reported-by: syzbot+5fe14f2ff4ccbace9a26@syzkaller.appspotmail.com
> Fixes: d41861942fc55 ("IB/core: Add generic function to extract IB speed from netdev")
> Signed-off-by: Denis Kirjanov <dkirjanov@suse.de>
> ---
> drivers/infiniband/core/verbs.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
> index 94a7f3b0c71c..9c09d8c328b4 100644
> --- a/drivers/infiniband/core/verbs.c
> +++ b/drivers/infiniband/core/verbs.c
> @@ -1976,11 +1976,13 @@ int ib_get_eth_speed(struct ib_device *dev, u32 port_num, u16 *speed, u8 *width)
> if (rdma_port_get_link_layer(dev, port_num) != IB_LINK_LAYER_ETHERNET)
> return -EINVAL;
>
> + rtnl_lock();
> netdev = ib_device_get_netdev(dev, port_num);
> - if (!netdev)
> + if (!netdev) {
> + rtnl_unlock()
> return -ENODEV;
> + }
>
> - rtnl_lock();
> rc = __ethtool_get_link_ksettings(netdev, &lksettings);
> rtnl_unlock();
>
> --
> 2.30.2
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2 net] RDMA/core: fix UAF in ib_get_eth_speed
2024-03-28 11:32 [PATCH v2 net] RDMA/core: fix UAF in ib_get_eth_speed Denis Kirjanov
2024-03-28 11:51 ` Eric Dumazet
@ 2024-03-28 11:58 ` Ratheesh Kannoth
2024-03-28 12:01 ` Naveen Mamindlapalli
2 siblings, 0 replies; 5+ messages in thread
From: Ratheesh Kannoth @ 2024-03-28 11:58 UTC (permalink / raw)
To: Denis Kirjanov
Cc: netdev, edumazet, jgg, leon, Denis Kirjanov, syzbot+5fe14f2ff4ccbace9a26
On 2024-03-28 at 17:02:33, Denis Kirjanov (kirjanov@gmail.com) wrote:
> A call to ib_device_get_netdev from ib_get_eth_speed
> may lead to a race condition while accessing a netdevice
> instance since we don't hold the rtnl lock while checking
> the registration state:
> if (res && res->reg_state != NETREG_REGISTERED) {
>
> v2: unlock rtnl on error patch
>
> Reported-by: syzbot+5fe14f2ff4ccbace9a26@syzkaller.appspotmail.com
> Fixes: d41861942fc55 ("IB/core: Add generic function to extract IB speed from netdev")
> Signed-off-by: Denis Kirjanov <dkirjanov@suse.de>
> ---
> drivers/infiniband/core/verbs.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
> index 94a7f3b0c71c..9c09d8c328b4 100644
> --- a/drivers/infiniband/core/verbs.c
> +++ b/drivers/infiniband/core/verbs.c
> @@ -1976,11 +1976,13 @@ int ib_get_eth_speed(struct ib_device *dev, u32 port_num, u16 *speed, u8 *width)
> if (rdma_port_get_link_layer(dev, port_num) != IB_LINK_LAYER_ETHERNET)
> return -EINVAL;
>
> + rtnl_lock();
> netdev = ib_device_get_netdev(dev, port_num);
ib_device_get_netdev() hold ref to dev before checking reg_state, isn't it enough ?
> - if (!netdev)
> + if (!netdev) {
> + rtnl_unlock()
> return -ENODEV;
> + }
>
> - rtnl_lock();
> rc = __ethtool_get_link_ksettings(netdev, &lksettings);
> rtnl_unlock();
>
> --
> 2.30.2
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* RE: [PATCH v2 net] RDMA/core: fix UAF in ib_get_eth_speed
2024-03-28 11:32 [PATCH v2 net] RDMA/core: fix UAF in ib_get_eth_speed Denis Kirjanov
2024-03-28 11:51 ` Eric Dumazet
2024-03-28 11:58 ` Ratheesh Kannoth
@ 2024-03-28 12:01 ` Naveen Mamindlapalli
2 siblings, 0 replies; 5+ messages in thread
From: Naveen Mamindlapalli @ 2024-03-28 12:01 UTC (permalink / raw)
To: Denis Kirjanov, netdev
Cc: edumazet, jgg, leon, Denis Kirjanov, syzbot+5fe14f2ff4ccbace9a26
> -----Original Message-----
> From: Denis Kirjanov <kirjanov@gmail.com>
> Sent: Thursday, March 28, 2024 5:03 PM
> To: netdev@vger.kernel.org
> Cc: edumazet@google.com; jgg@ziepe.ca; leon@kernel.org; Denis Kirjanov
> <dkirjanov@suse.de>; syzbot+5fe14f2ff4ccbace9a26@syzkaller.appspotmail.com
> Subject: [PATCH v2 net] RDMA/core: fix UAF in ib_get_eth_speed
>
> A call to ib_device_get_netdev from ib_get_eth_speed may lead to a race
> condition while accessing a netdevice instance since we don't hold the rtnl lock
> while checking the registration state:
> if (res && res->reg_state != NETREG_REGISTERED) {
>
> v2: unlock rtnl on error patch
>
> Reported-by: syzbot+5fe14f2ff4ccbace9a26@syzkaller.appspotmail.com
> Fixes: d41861942fc55 ("IB/core: Add generic function to extract IB speed from
> netdev")
> Signed-off-by: Denis Kirjanov <dkirjanov@suse.de>
> ---
> drivers/infiniband/core/verbs.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c index
> 94a7f3b0c71c..9c09d8c328b4 100644
> --- a/drivers/infiniband/core/verbs.c
> +++ b/drivers/infiniband/core/verbs.c
> @@ -1976,11 +1976,13 @@ int ib_get_eth_speed(struct ib_device *dev, u32
> port_num, u16 *speed, u8 *width)
> if (rdma_port_get_link_layer(dev, port_num) !=
> IB_LINK_LAYER_ETHERNET)
> return -EINVAL;
>
> + rtnl_lock();
> netdev = ib_device_get_netdev(dev, port_num);
> - if (!netdev)
> + if (!netdev) {
> + rtnl_unlock()
> return -ENODEV;
> + }
>
> - rtnl_lock();
> rc = __ethtool_get_link_ksettings(netdev, &lksettings);
> rtnl_unlock();
>
> --
> 2.30.2
>
Reviewed-by: Naveen Mamindlapalli <naveenm@marvell.com>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2 net] RDMA/core: fix UAF in ib_get_eth_speed
2024-03-28 11:51 ` Eric Dumazet
@ 2024-03-28 12:18 ` Denis Kirjanov
0 siblings, 0 replies; 5+ messages in thread
From: Denis Kirjanov @ 2024-03-28 12:18 UTC (permalink / raw)
To: Eric Dumazet, Denis Kirjanov
Cc: netdev, jgg, leon, syzbot+5fe14f2ff4ccbace9a26
On 3/28/24 14:51, Eric Dumazet wrote:
> On Thu, Mar 28, 2024 at 12:32 PM Denis Kirjanov <kirjanov@gmail.com> wrote:
>>
>> A call to ib_device_get_netdev from ib_get_eth_speed
>> may lead to a race condition while accessing a netdevice
>> instance since we don't hold the rtnl lock while checking
>> the registration state:
>> if (res && res->reg_state != NETREG_REGISTERED) {
>>
>> v2: unlock rtnl on error patch
>>
>
> What about other callers of ib_device_get_netdev() ?
I'll add ASSERT_RTNL() to ib_device_get_netdev and update the remaining callers.
Thanks!
>
> It seems they also could be racy.
>
>> Reported-by: syzbot+5fe14f2ff4ccbace9a26@syzkaller.appspotmail.com
>> Fixes: d41861942fc55 ("IB/core: Add generic function to extract IB speed from netdev")
>> Signed-off-by: Denis Kirjanov <dkirjanov@suse.de>
>> ---
>> drivers/infiniband/core/verbs.c | 6 ++++--
>> 1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
>> index 94a7f3b0c71c..9c09d8c328b4 100644
>> --- a/drivers/infiniband/core/verbs.c
>> +++ b/drivers/infiniband/core/verbs.c
>> @@ -1976,11 +1976,13 @@ int ib_get_eth_speed(struct ib_device *dev, u32 port_num, u16 *speed, u8 *width)
>> if (rdma_port_get_link_layer(dev, port_num) != IB_LINK_LAYER_ETHERNET)
>> return -EINVAL;
>>
>> + rtnl_lock();
>> netdev = ib_device_get_netdev(dev, port_num);
>> - if (!netdev)
>> + if (!netdev) {
>> + rtnl_unlock()
>> return -ENODEV;
>> + }
>>
>> - rtnl_lock();
>> rc = __ethtool_get_link_ksettings(netdev, &lksettings);
>> rtnl_unlock();
>>
>> --
>> 2.30.2
>>
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2024-03-28 12:18 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2024-03-28 11:32 [PATCH v2 net] RDMA/core: fix UAF in ib_get_eth_speed Denis Kirjanov
2024-03-28 11:51 ` Eric Dumazet
2024-03-28 12:18 ` Denis Kirjanov
2024-03-28 11:58 ` Ratheesh Kannoth
2024-03-28 12:01 ` Naveen Mamindlapalli
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