From 7b62d31d3f399079e7de7cc43e85d6481170970a Mon Sep 17 00:00:00 2001
From: Coly Li <colyli@suse.de>
Date: Fri, 2 Oct 2020 16:27:29 +0800
Subject: [PATCH] net: add WARN_ONCE in kernel_sendpage() for improper
 zero-copy send
Git-commit: 7b62d31d3f399079e7de7cc43e85d6481170970a
Patch-mainline: v5.9
References: bsc#1172873

If a page sent into kernel_sendpage() is a slab page or it doesn't have
ref_count, this page is improper to send by the zero copy sendpage()
method. Otherwise such page might be unexpected released in network code
path and causes impredictable panic due to kernel memory management data
structure corruption.

This path adds a WARN_ON() on the sending page before sends it into the
concrete zero-copy sendpage() method, if the page is improper for the
zero-copy sendpage() method, a warning message can be observed before
the consequential unpredictable kernel panic.

This patch does not change existing kernel_sendpage() behavior for the
improper page zero-copy send, it just provides hint warning message for
following potential panic due the kernel memory heap corruption.

Signed-off-by: Coly Li <colyli@suse.de>
Cc: Cong Wang <amwang@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

---
 net/socket.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/socket.c b/net/socket.c
index 0c0144604f81..58cac2da5f66 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -3638,9 +3638,11 @@ EXPORT_SYMBOL(kernel_getpeername);
 int kernel_sendpage(struct socket *sock, struct page *page, int offset,
 		    size_t size, int flags)
 {
-	if (sock->ops->sendpage)
+	if (sock->ops->sendpage) {
+		/* Warn in case the improper page to zero-copy send */
+		WARN_ONCE(!sendpage_ok(page), "improper page for zero-copy send");
 		return sock->ops->sendpage(sock, page, offset, size, flags);
-
+	}
 	return sock_no_sendpage(sock, page, offset, size, flags);
 }
 EXPORT_SYMBOL(kernel_sendpage);
-- 
2.26.2