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authorDavid S. Miller <davem@sunset.davemloft.net>2006-04-20 00:10:50 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-04-20 00:10:50 -0700
commitdc6de33674608f978ec29f5c2f7e3af458c06f78 (patch)
tree1b314717cdb27cf75478c13f85249f85f6997f48 /include
parentb60b49ea6a3e1f8dcaf4148dad0daab61ab766d2 (diff)
downloadop-kernel-dev-dc6de33674608f978ec29f5c2f7e3af458c06f78.zip
op-kernel-dev-dc6de33674608f978ec29f5c2f7e3af458c06f78.tar.gz
[NET]: Add skb->truesize assertion checking.
Add some sanity checking. truesize should be at least sizeof(struct sk_buff) plus the current packet length. If not, then truesize is seriously mangled and deserves a kernel log message. Currently we'll do the check for release of stream socket buffers. But we can add checks to more spots over time. Incorporating ideas from Herbert Xu. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/skbuff.h7
-rw-r--r--include/net/sock.h1
2 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index c4619a4..f8f2347 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -344,6 +344,13 @@ extern void skb_over_panic(struct sk_buff *skb, int len,
void *here);
extern void skb_under_panic(struct sk_buff *skb, int len,
void *here);
+extern void skb_truesize_bug(struct sk_buff *skb);
+
+static inline void skb_truesize_check(struct sk_buff *skb)
+{
+ if (unlikely((int)skb->truesize < sizeof(struct sk_buff) + skb->len))
+ skb_truesize_bug(skb);
+}
extern int skb_append_datato_frags(struct sock *sk, struct sk_buff *skb,
int getfrag(void *from, char *to, int offset,
diff --git a/include/net/sock.h b/include/net/sock.h
index af2b054..ff8b0da 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -454,6 +454,7 @@ static inline void sk_stream_set_owner_r(struct sk_buff *skb, struct sock *sk)
static inline void sk_stream_free_skb(struct sock *sk, struct sk_buff *skb)
{
+ skb_truesize_check(skb);
sock_set_flag(sk, SOCK_QUEUE_SHRUNK);
sk->sk_wmem_queued -= skb->truesize;
sk->sk_forward_alloc += skb->truesize;
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