From: Christoph Hellwig <hch@lst.de> To: Coly Li <colyli@suse.de> Cc: linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, netdev@vger.kernel.org, open-iscsi@googlegroups.com, linux-scsi@vger.kernel.org, ceph-devel@vger.kernel.org, linux-kernel@vger.kernel.org, Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>, Christoph Hellwig <hch@lst.de>, Hannes Reinecke <hare@suse.de>, Jan Kara <jack@suse.com>, Jens Axboe <axboe@kernel.dk>, Mikhail Skorzhinskii <mskorzhinskiy@solarflare.com>, Philipp Reisner <philipp.reisner@linbit.com>, Sagi Grimberg <sagi@grimberg.me>, Vlastimil Babka <vbabka@suse.com>, stable@vger.kernel.org Subject: Re: [PATCH v7 1/6] net: introduce helper sendpage_ok() in include/linux/net.h Date: Tue, 18 Aug 2020 18:24:04 +0200 [thread overview] Message-ID: <20200818162404.GA27196@lst.de> (raw) In-Reply-To: <20200818131227.37020-2-colyli@suse.de> I think we should go for something simple like this instead: --- From 4867e158ee86ebd801b4c267e8f8a4a762a71343 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig <hch@lst.de> Date: Tue, 18 Aug 2020 18:19:23 +0200 Subject: net: bypass ->sendpage for slab pages Sending Slab or tail pages into ->sendpage will cause really strange delayed oops. Prevent it right in the networking code instead of requiring drivers to work around the fact. Signed-off-by: Christoph Hellwig <hch@lst.de> --- net/socket.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/net/socket.c b/net/socket.c index dbbe8ea7d395da..fbc82eb96d18ce 100644 --- a/net/socket.c +++ b/net/socket.c @@ -3638,7 +3638,12 @@ EXPORT_SYMBOL(kernel_getpeername); int kernel_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) { - if (sock->ops->sendpage) + /* + * sendpage does manipulates the refcount of the passed in page, which + * does not work for Slab pages, or for tails of non-__GFP_COMP + * high order pages. + */ + if (sock->ops->sendpage && !PageSlab(page) && page_count(page) > 0) return sock->ops->sendpage(sock, page, offset, size, flags); return sock_no_sendpage(sock, page, offset, size, flags); -- 2.28.0
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de> To: Coly Li <colyli@suse.de> Cc: Jens Axboe <axboe@kernel.dk>, Vlastimil Babka <vbabka@suse.com>, Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, Philipp Reisner <philipp.reisner@linbit.com>, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, Mikhail Skorzhinskii <mskorzhinskiy@solarflare.com>, linux-block@vger.kernel.org, Hannes Reinecke <hare@suse.de>, Jan Kara <jack@suse.com>, stable@vger.kernel.org, ceph-devel@vger.kernel.org, open-iscsi@googlegroups.com, Christoph Hellwig <hch@lst.de>, Sagi Grimberg <sagi@grimberg.me> Subject: Re: [PATCH v7 1/6] net: introduce helper sendpage_ok() in include/linux/net.h Date: Tue, 18 Aug 2020 18:24:04 +0200 [thread overview] Message-ID: <20200818162404.GA27196@lst.de> (raw) In-Reply-To: <20200818131227.37020-2-colyli@suse.de> I think we should go for something simple like this instead: --- From 4867e158ee86ebd801b4c267e8f8a4a762a71343 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig <hch@lst.de> Date: Tue, 18 Aug 2020 18:19:23 +0200 Subject: net: bypass ->sendpage for slab pages Sending Slab or tail pages into ->sendpage will cause really strange delayed oops. Prevent it right in the networking code instead of requiring drivers to work around the fact. Signed-off-by: Christoph Hellwig <hch@lst.de> --- net/socket.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/net/socket.c b/net/socket.c index dbbe8ea7d395da..fbc82eb96d18ce 100644 --- a/net/socket.c +++ b/net/socket.c @@ -3638,7 +3638,12 @@ EXPORT_SYMBOL(kernel_getpeername); int kernel_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) { - if (sock->ops->sendpage) + /* + * sendpage does manipulates the refcount of the passed in page, which + * does not work for Slab pages, or for tails of non-__GFP_COMP + * high order pages. + */ + if (sock->ops->sendpage && !PageSlab(page) && page_count(page) > 0) return sock->ops->sendpage(sock, page, offset, size, flags); return sock_no_sendpage(sock, page, offset, size, flags); -- 2.28.0 _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme
next prev parent reply other threads:[~2020-08-18 16:29 UTC|newest] Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-08-18 13:12 [PATCH v7 0/6] Introduce sendpage_ok() to detect misused sendpage in network related drivers Coly Li 2020-08-18 13:12 ` Coly Li 2020-08-18 13:12 ` [PATCH v7 1/6] net: introduce helper sendpage_ok() in include/linux/net.h Coly Li 2020-08-18 13:12 ` Coly Li 2020-08-18 16:24 ` Christoph Hellwig [this message] 2020-08-18 16:24 ` Christoph Hellwig 2020-08-18 16:33 ` Coly Li 2020-08-18 16:33 ` Coly Li 2020-08-18 19:49 ` Christoph Hellwig 2020-08-18 19:49 ` Christoph Hellwig 2020-08-19 4:22 ` Coly Li 2020-08-19 4:22 ` Coly Li 2020-09-23 8:43 ` Christoph Hellwig 2020-09-23 8:43 ` Christoph Hellwig 2020-09-23 8:45 ` Coly Li 2020-09-23 8:45 ` Coly Li 2020-08-18 13:12 ` [PATCH v7 2/6] nvme-tcp: check page by sendpage_ok() before calling kernel_sendpage() Coly Li 2020-08-18 13:12 ` Coly Li 2020-08-18 13:12 ` [PATCH v7 3/6] tcp: use sendpage_ok() to detect misused .sendpage Coly Li 2020-08-18 13:12 ` Coly Li 2020-08-18 13:12 ` [PATCH v7 4/6] drbd: code cleanup by using sendpage_ok() to check page for kernel_sendpage() Coly Li 2020-08-18 13:12 ` Coly Li 2020-08-18 13:12 ` [PATCH v7 5/6] scsi: libiscsi: use sendpage_ok() in iscsi_tcp_segment_map() Coly Li 2020-08-18 13:12 ` Coly Li 2020-08-18 13:12 ` [PATCH v7 6/6] libceph: use sendpage_ok() in ceph_tcp_sendpage() Coly Li 2020-08-18 13:12 ` Coly Li
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