Patchwork [2/2] netfilter: fix hardcoded size assumptions

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Submitter Hagen Paul Pfeifer
Date Feb. 19, 2009, 11:43 p.m.
Message ID <1235087023-30451-3-git-send-email-hagen@jauu.net>
Download mbox | patch
Permalink /patch/23459/
State Not Applicable
Delegated to: David Miller
Headers show

Comments

Hagen Paul Pfeifer - Feb. 19, 2009, 11:43 p.m.
get_random_bytes() is sometimes called with a hard coded size assumption
of an integer. This could not be true for next centuries. This patch
replace it with a compile time statement.

Signed-off-by: Hagen Paul Pfeifer <hagen@jauu.net>
---
 net/netfilter/nf_conntrack_core.c   |    5 +++--
 net/netfilter/nf_conntrack_expect.c |    2 +-
 net/netfilter/xt_hashlimit.c        |    2 +-
 3 files changed, 5 insertions(+), 4 deletions(-)

Patch

diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index f3aa4e6..2235432 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -472,7 +472,8 @@  struct nf_conn *nf_conntrack_alloc(struct net *net,
 	struct nf_conn *ct;
 
 	if (unlikely(!nf_conntrack_hash_rnd_initted)) {
-		get_random_bytes(&nf_conntrack_hash_rnd, 4);
+		get_random_bytes(&nf_conntrack_hash_rnd,
+				sizeof(nf_conntrack_hash_rnd));
 		nf_conntrack_hash_rnd_initted = 1;
 	}
 
@@ -1103,7 +1104,7 @@  int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp)
 
 	/* We have to rehahs for the new table anyway, so we also can
 	 * use a newrandom seed */
-	get_random_bytes(&rnd, 4);
+	get_random_bytes(&rnd, sizeof(rnd));
 
 	/* Lookups in the old hash might happen in parallel, which means we
 	 * might get false negatives during connection lookup. New connections
diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c
index 3a8a34a..19b4779 100644
--- a/net/netfilter/nf_conntrack_expect.c
+++ b/net/netfilter/nf_conntrack_expect.c
@@ -72,7 +72,7 @@  static unsigned int nf_ct_expect_dst_hash(const struct nf_conntrack_tuple *tuple
 	unsigned int hash;
 
 	if (unlikely(!nf_ct_expect_hash_rnd_initted)) {
-		get_random_bytes(&nf_ct_expect_hash_rnd, 4);
+		get_random_bytes(&nf_ct_expect_hash_rnd, sizeof(nf_ct_expect_hash_rnd));
 		nf_ct_expect_hash_rnd_initted = 1;
 	}
 
diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c
index f97fded..2482055 100644
--- a/net/netfilter/xt_hashlimit.c
+++ b/net/netfilter/xt_hashlimit.c
@@ -149,7 +149,7 @@  dsthash_alloc_init(struct xt_hashlimit_htable *ht,
 	/* initialize hash with random val at the time we allocate
 	 * the first hashtable entry */
 	if (!ht->rnd_initialized) {
-		get_random_bytes(&ht->rnd, 4);
+		get_random_bytes(&ht->rnd, sizeof(ht->rnd));
 		ht->rnd_initialized = 1;
 	}