[PATCH v8 2/7] net: add WARN_ONCE in kernel_sendpage() for improper zero-copy send

[Coly Li]

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 at suse.de>
Cc: Cong Wang <amwang at redhat.com>
Cc: Christoph Hellwig <hch at lst.de>
Cc: David S. Miller <davem at davemloft.net>
Cc: Sridhar Samudrala <sri at us.ibm.com>
---
 net/socket.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/socket.c b/net/socket.c
index 0c0144604f81..771456a1d947 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));
 		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