Jakub Kicinski e2d10f1de1 net: tls: avoid discarding data on record close ... [ Upstream commit 6b47808f22 ] TLS records end with a 16B tag. For TLS device offload we only need to make space for this tag in the stream, the device will generate and replace it with the actual calculated tag. Long time ago the code would just re-reference the head frag which mostly worked but was suboptimal because it prevented TCP from combining the record into a single skb frag. I'm not sure if it was correct as the first frag may be shorter than the tag. The commit under fixes tried to replace that with using the page frag and if the allocation failed rolling back the data, if record was long enough. It achieves better fragment coalescing but is also buggy. We don't roll back the iterator, so unless we're at the end of send we'll skip the data we designated as tag and start the next record as if the rollback never happened. There's also the possibility that the record was constructed with MSG_MORE and the data came from a different syscall and we already told the user space that we "got it". Allocate a single dummy page and use it as fallback. Found by code inspection, and proven by forcing allocation failures. Fixes: e7b159a48b ("net/tls: remove the record tail optimization") Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-08-26 14:23:22 +02:00
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Kconfig	net/tls: Select SOCK_RX_QUEUE_MAPPING from TLS_DEVICE	2021-02-11 19:08:06 -08:00
Makefile	net/tls: add skeleton of MIB statistics	2019-10-05 16:29:00 -07:00
tls_device_fallback.c	net/tls: Fix use-after-free after the TLS device goes down and up	2021-06-01 15:58:05 -07:00
tls_device.c	net: tls: avoid discarding data on record close	2023-08-26 14:23:22 +02:00
tls_main.c	net: deal with most data-races in sk_wait_event()	2023-05-24 17:36:42 +01:00
tls_proc.c	net: fix proc_fs init handling in af_packet and tls	2020-12-14 19:39:30 -08:00
tls_sw.c	net: tls: avoid hanging tasks on the tx_lock	2023-03-11 13:57:39 +01:00
tls_toe.c	net/tls: rename tls_hw_* functions tls_toe_*	2019-10-04 14:07:07 -07:00
trace.c	net/tls: add tracing for device/offload events	2019-10-05 16:29:00 -07:00
trace.h	net/tls: add device decrypted trace point	2019-10-05 16:29:00 -07:00