Re: [PATCH] net/core/skbuff.c: __netdev_alloc_skb fix when len is greater than KMALLOC_MAX_SIZE

From: Alexander Lobakin
Date: Sat Feb 27 2021 - 06:06:36 EST


From: Pavel Skripkin <paskripkin@xxxxxxxxx>
Date: Fri, 26 Feb 2021 22:11:06 +0300

Hi,

> syzbot found WARNING in __alloc_pages_nodemask()[1] when order >= MAX_ORDER.
> It was caused by __netdev_alloc_skb(), which doesn't check len value after adding NET_SKB_PAD.
> Order will be >= MAX_ORDER and passed to __alloc_pages_nodemask() if size > KMALLOC_MAX_SIZE.
>
> static void *kmalloc_large_node(size_t size, gfp_t flags, int node)
> {
> struct page *page;
> void *ptr = NULL;
> unsigned int order = get_order(size);
> ...
> page = alloc_pages_node(node, flags, order);
> ...
>
> [1] WARNING in __alloc_pages_nodemask+0x5f8/0x730 mm/page_alloc.c:5014
> Call Trace:
> __alloc_pages include/linux/gfp.h:511 [inline]
> __alloc_pages_node include/linux/gfp.h:524 [inline]
> alloc_pages_node include/linux/gfp.h:538 [inline]
> kmalloc_large_node+0x60/0x110 mm/slub.c:3999
> __kmalloc_node_track_caller+0x319/0x3f0 mm/slub.c:4496
> __kmalloc_reserve net/core/skbuff.c:150 [inline]
> __alloc_skb+0x4e4/0x5a0 net/core/skbuff.c:210
> __netdev_alloc_skb+0x70/0x400 net/core/skbuff.c:446
> netdev_alloc_skb include/linux/skbuff.h:2832 [inline]
> qrtr_endpoint_post+0x84/0x11b0 net/qrtr/qrtr.c:442
> qrtr_tun_write_iter+0x11f/0x1a0 net/qrtr/tun.c:98
> call_write_iter include/linux/fs.h:1901 [inline]
> new_sync_write+0x426/0x650 fs/read_write.c:518
> vfs_write+0x791/0xa30 fs/read_write.c:605
> ksys_write+0x12d/0x250 fs/read_write.c:658
> do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
> entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> Reported-by: syzbot+80dccaee7c6630fa9dcf@xxxxxxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Pavel Skripkin <paskripkin@xxxxxxxxx>
> Change-Id: I480a6d6f818a4c0a387db0cd3f230b68a7daeb16
> ---
> net/core/skbuff.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index 785daff48030..dc28c8f7bf5f 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -443,6 +443,9 @@ struct sk_buff *__netdev_alloc_skb(struct net_device *dev, unsigned int len,
> if (len <= SKB_WITH_OVERHEAD(1024) ||
> len > SKB_WITH_OVERHEAD(PAGE_SIZE) ||
> (gfp_mask & (__GFP_DIRECT_RECLAIM | GFP_DMA))) {
> + if (len > KMALLOC_MAX_SIZE)
> + return NULL;

I'd use unlikely() for this as it's very very rare condition on the
very hot path.

Also, I'd add the same check below into __napi_alloc_skb() as it has
the same fallback.

> skb = __alloc_skb(len, gfp_mask, SKB_ALLOC_RX, NUMA_NO_NODE);
> if (!skb)
> goto skb_fail;
> --
> 2.25.1

Thanks,
Al