AcoSail/kernel_optimize_test
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net: add a truesize parameter to skb_add_rx_frag()

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skb_add_rx_frag() API is misleading.

Network skbs built with this helper can use uncharged kernel memory and
eventually stress/crash machine in OOM.

Add a 'truesize' parameter and then fix drivers in followup patches.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2012-03-23 23:59:33 +00:00 committed by David S. Miller
parent 0015e551ed
commit 50269e19ad
7 changed files with 13 additions and 9 deletions
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6
drivers/net/usb/cdc-phonet.c
View File

@ -164,12 +164,14 @@ static void rx_complete(struct urb *req)
/* Can't use pskb_pull() on page in IRQ */
memcpy(skb_put(skb, 1), page_address(page), 1);
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
page, 1, req->actual_length);
page, 1, req->actual_length,
req->actual_length);
page = NULL;
}
} else {
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
page, 0, req->actual_length);
page, 0, req->actual_length,
req->actual_length);
page = NULL;
}
if (req->actual_length < PAGE_SIZE)

3
drivers/net/wireless/iwlegacy/3945.c
View File

@ -499,7 +499,8 @@ il3945_pass_packet_to_mac80211(struct il_priv *il, struct il_rx_buf *rxb,
le32_to_cpu(rx_end->status), stats);
skb_add_rx_frag(skb, 0, rxb->page,
(void *)rx_hdr->payload - (void *)pkt, len);
(void *)rx_hdr->payload - (void *)pkt, len,
len);
il_update_stats(il, false, fc, len);
memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));

3
drivers/net/wireless/iwlegacy/4965-mac.c
View File

@ -596,7 +596,8 @@ il4965_pass_packet_to_mac80211(struct il_priv *il, struct ieee80211_hdr *hdr,
return;
}
skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len);
skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len,
len);
il_update_stats(il, false, fc, len);
memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));

2
drivers/net/wireless/iwlwifi/iwl-agn-rx.c
View File

@ -796,7 +796,7 @@ static void iwlagn_pass_packet_to_mac80211(struct iwl_priv *priv,
offset = (void *)hdr - rxb_addr(rxb);
p = rxb_steal_page(rxb);
skb_add_rx_frag(skb, 0, p, offset, len);
skb_add_rx_frag(skb, 0, p, offset, len, len);
iwl_update_stats(priv, false, fc, len);

2
drivers/usb/gadget/f_phonet.c
View File

@ -345,7 +345,7 @@ static void pn_rx_complete(struct usb_ep *ep, struct usb_request *req)
}
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
skb->len <= 1, req->actual);
skb->len <= 1, req->actual, req->actual);
page = NULL;
if (req->actual < req->length) { /* Last fragment */

2
include/linux/skbuff.h
View File

@ -1244,7 +1244,7 @@ static inline void skb_fill_page_desc(struct sk_buff *skb, int i,
}
extern void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page,
int off, int size);
int off, int size, unsigned int truesize);
#define SKB_PAGE_ASSERT(skb) BUG_ON(skb_shinfo(skb)->nr_frags)
#define SKB_FRAG_ASSERT(skb) BUG_ON(skb_has_frag_list(skb))

4
net/core/skbuff.c
View File

@ -321,12 +321,12 @@ struct sk_buff *__netdev_alloc_skb(struct net_device *dev,
EXPORT_SYMBOL(__netdev_alloc_skb);
void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off,
int size)
int size, unsigned int truesize)
{
skb_fill_page_desc(skb, i, page, off, size);
skb->len += size;
skb->data_len += size;
skb->truesize += size;
skb->truesize += truesize;
}
EXPORT_SYMBOL(skb_add_rx_frag);