Hello,
On Mon, 2 Oct 2023 13:54:28 +0300 Sagi Grimberg sagi@grimberg.me wrote:
From Alon: "Due to a logical bug in the NVMe-oF/TCP subsystem in the Linux kernel, a malicious user can cause a UAF and a double free, which may lead to RCE (may also lead to an LPE in case the attacker already has local privileges)."
Hence, when a queue initialization fails after the ahash requests are allocated, it is guaranteed that the queue removal async work will be called, hence leave the deallocation to the queue removal.
Also, be extra careful not to continue processing the socket, so set queue rcv_state to NVMET_TCP_RECV_ERR upon a socket error.
Reported-by: Alon Zahavi zahavi.alon@gmail.com Tested-by: Alon Zahavi zahavi.alon@gmail.com Signed-off-by: Sagi Grimberg sagi@grimberg.me
Would it be better to add Fixes: and Cc: stable lines?
Thanks, SJ
drivers/nvme/target/tcp.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/drivers/nvme/target/tcp.c b/drivers/nvme/target/tcp.c index 97d07488072d..d840f996eb82 100644 --- a/drivers/nvme/target/tcp.c +++ b/drivers/nvme/target/tcp.c @@ -372,6 +372,7 @@ static void nvmet_tcp_fatal_error(struct nvmet_tcp_queue *queue) static void nvmet_tcp_socket_error(struct nvmet_tcp_queue *queue, int status) {
- queue->rcv_state = NVMET_TCP_RECV_ERR; if (status == -EPIPE || status == -ECONNRESET) kernel_sock_shutdown(queue->sock, SHUT_RDWR); else
@@ -910,15 +911,11 @@ static int nvmet_tcp_handle_icreq(struct nvmet_tcp_queue *queue) iov.iov_len = sizeof(*icresp); ret = kernel_sendmsg(queue->sock, &msg, &iov, 1, iov.iov_len); if (ret < 0)
goto free_crypto;
return ret; /* queue removal will cleanup */queue->state = NVMET_TCP_Q_LIVE; nvmet_prepare_receive_pdu(queue); return 0; -free_crypto:
- if (queue->hdr_digest || queue->data_digest)
nvmet_tcp_free_crypto(queue);- return ret;
} static void nvmet_tcp_handle_req_failure(struct nvmet_tcp_queue *queue, -- 2.41.0
Hello,
On Mon, 2 Oct 2023 13:54:28 +0300 Sagi Grimberg sagi@grimberg.me wrote:
From Alon: "Due to a logical bug in the NVMe-oF/TCP subsystem in the Linux kernel, a malicious user can cause a UAF and a double free, which may lead to RCE (may also lead to an LPE in case the attacker already has local privileges)."
Hence, when a queue initialization fails after the ahash requests are allocated, it is guaranteed that the queue removal async work will be called, hence leave the deallocation to the queue removal.
Also, be extra careful not to continue processing the socket, so set queue rcv_state to NVMET_TCP_RECV_ERR upon a socket error.
Reported-by: Alon Zahavi zahavi.alon@gmail.com Tested-by: Alon Zahavi zahavi.alon@gmail.com Signed-off-by: Sagi Grimberg sagi@grimberg.me
Would it be better to add Fixes: and Cc: stable lines?
This issue existed since the introduction of the driver, I am not sure it applies cleanly that far back...
I figured that the description and Reported-by tag will trigger stable kernel pick up...
On Wed, Oct 04, 2023 at 12:41:30PM +0300, Sagi Grimberg wrote:
Hello,
On Mon, 2 Oct 2023 13:54:28 +0300 Sagi Grimberg sagi@grimberg.me wrote:
From Alon: "Due to a logical bug in the NVMe-oF/TCP subsystem in the Linux kernel, a malicious user can cause a UAF and a double free, which may lead to RCE (may also lead to an LPE in case the attacker already has local privileges)."
Hence, when a queue initialization fails after the ahash requests are allocated, it is guaranteed that the queue removal async work will be called, hence leave the deallocation to the queue removal.
Also, be extra careful not to continue processing the socket, so set queue rcv_state to NVMET_TCP_RECV_ERR upon a socket error.
Reported-by: Alon Zahavi zahavi.alon@gmail.com Tested-by: Alon Zahavi zahavi.alon@gmail.com Signed-off-by: Sagi Grimberg sagi@grimberg.me
Would it be better to add Fixes: and Cc: stable lines?
This issue existed since the introduction of the driver, I am not sure it applies cleanly that far back...
I figured that the description and Reported-by tag will trigger stable kernel pick up...
<formletter>
This is not the correct way to submit patches for inclusion in the stable kernel tree. Please read: https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html for how to do this properly.
</formletter>
Hello,
On Mon, 2 Oct 2023 13:54:28 +0300 Sagi Grimberg sagi@grimberg.me wrote:
From Alon: "Due to a logical bug in the NVMe-oF/TCP subsystem in the Linux kernel, a malicious user can cause a UAF and a double free, which may lead to RCE (may also lead to an LPE in case the attacker already has local privileges)."
Hence, when a queue initialization fails after the ahash requests are allocated, it is guaranteed that the queue removal async work will be called, hence leave the deallocation to the queue removal.
Also, be extra careful not to continue processing the socket, so set queue rcv_state to NVMET_TCP_RECV_ERR upon a socket error.
Reported-by: Alon Zahavi zahavi.alon@gmail.com Tested-by: Alon Zahavi zahavi.alon@gmail.com Signed-off-by: Sagi Grimberg sagi@grimberg.me
Would it be better to add Fixes: and Cc: stable lines?
This issue existed since the introduction of the driver, I am not sure it applies cleanly that far back...
I figured that the description and Reported-by tag will trigger stable kernel pick up...
<formletter>
This is not the correct way to submit patches for inclusion in the stable kernel tree. Please read: https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html for how to do this properly.
</formletter>
I could have sworn to have seen patches that did not have stable CCd nor a Fixes tag and was picked up for stable kernels :) But I guess those were either hallucinations or someone sending patches to stable...
I can resend with CC to stable.
Thanks.
On Wed, 4 Oct 2023 16:25:13 +0300 Sagi Grimberg sagi@grimberg.me wrote:
Hello,
On Mon, 2 Oct 2023 13:54:28 +0300 Sagi Grimberg sagi@grimberg.me wrote:
From Alon: "Due to a logical bug in the NVMe-oF/TCP subsystem in the Linux kernel, a malicious user can cause a UAF and a double free, which may lead to RCE (may also lead to an LPE in case the attacker already has local privileges)."
Hence, when a queue initialization fails after the ahash requests are allocated, it is guaranteed that the queue removal async work will be called, hence leave the deallocation to the queue removal.
Also, be extra careful not to continue processing the socket, so set queue rcv_state to NVMET_TCP_RECV_ERR upon a socket error.
Reported-by: Alon Zahavi zahavi.alon@gmail.com Tested-by: Alon Zahavi zahavi.alon@gmail.com Signed-off-by: Sagi Grimberg sagi@grimberg.me
Would it be better to add Fixes: and Cc: stable lines?
This issue existed since the introduction of the driver, I am not sure it applies cleanly that far back...
Based on the rule[1], I think people who need this fix on the old kernel would do that. I'd just say adding Fixes: would help it, so better than nothing.
[1] https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
I figured that the description and Reported-by tag will trigger stable kernel pick up...
<formletter>
This is not the correct way to submit patches for inclusion in the stable kernel tree. Please read: https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html for how to do this properly.
</formletter>
I could have sworn to have seen patches that did not have stable CCd nor a Fixes tag and was picked up for stable kernels :)
I could also swear. Stable kernel maintainers are great at finding fixes on their own. But I think adding those could help them avoiding any mistake, and therefore better than nothing, again.
But I guess those were either hallucinations or someone sending patches to stable...
I can resend with CC to stable.
Thank you :)
Thanks, SJ
Thanks.
On Wed, Oct 04, 2023 at 04:25:13PM +0300, Sagi Grimberg wrote:
Hello,
On Mon, 2 Oct 2023 13:54:28 +0300 Sagi Grimberg sagi@grimberg.me wrote:
From Alon: "Due to a logical bug in the NVMe-oF/TCP subsystem in the Linux kernel, a malicious user can cause a UAF and a double free, which may lead to RCE (may also lead to an LPE in case the attacker already has local privileges)."
Hence, when a queue initialization fails after the ahash requests are allocated, it is guaranteed that the queue removal async work will be called, hence leave the deallocation to the queue removal.
Also, be extra careful not to continue processing the socket, so set queue rcv_state to NVMET_TCP_RECV_ERR upon a socket error.
Reported-by: Alon Zahavi zahavi.alon@gmail.com Tested-by: Alon Zahavi zahavi.alon@gmail.com Signed-off-by: Sagi Grimberg sagi@grimberg.me
Would it be better to add Fixes: and Cc: stable lines?
This issue existed since the introduction of the driver, I am not sure it applies cleanly that far back...
I figured that the description and Reported-by tag will trigger stable kernel pick up...
<formletter>
This is not the correct way to submit patches for inclusion in the stable kernel tree. Please read: https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html for how to do this properly.
</formletter>
I could have sworn to have seen patches that did not have stable CCd nor a Fixes tag and was picked up for stable kernels :) But I guess those were either hallucinations or someone sending patches to stable...
That happens, but there are no guarantees around it.
If you really want for a patch to land in stable, and want to know if for some reason it didn't, the only way to do it is with an explicit stable tag. Otherwise it's just "best effort".
linux-stable-mirror@lists.linaro.org
-
Greg KH -
Sagi Grimberg -
Sasha Levin -
SeongJae Park -
sj＠kernel.org