The commit is pushed to "branch-rh8-4.18.0-240.1.1.vz8.5.x-ovz" and will appear
at https://src.openvz.org/scm/ovz/vzkernel.git
after rh8-4.18.0-240.1.1.vz8.5.40
------>
commit 03b54cdf1b6808ee010c27d1b205e2800dc120a9
Author: Vasily Averin <v...@virtuozzo.com>
Date: Fri Jun 11 15:33:48 2021 +0300
ms/tcp: detecting the misuse of .sendpage for Slab objects
sendpage was not designed for processing of the Slab pages,
in some situations it can trigger BUG_ON on receiving side.
Signed-off-by: Vasily Averin <v...@virtuozzo.com>
Signed-off-by: Eric Dumazet <eduma...@google.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
(cherry-picked from ms a10674bf2406 ("tcp: detecting the misuse of
.sendpage for
Slab objects"))
Signed-off-by: Andrey Zhadchenko <andrey.zhadche...@virtuozzo.com>
---
net/ipv4/tcp.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 419668569530..538d63ca58c5 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -961,6 +961,10 @@ ssize_t do_tcp_sendpages(struct sock *sk, struct page
*page, int offset,
ssize_t copied;
long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
+ if (IS_ENABLED(CONFIG_DEBUG_VM) &&
+ WARN_ONCE(PageSlab(page), "page must not be a Slab one"))
+ return -EINVAL;
+
/* Wait for a connection to finish. One exception is TCP Fast Open
* (passive side) where data is allowed to be sent before a connection
* is fully established.
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