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Diffstat (limited to 'net')
-rw-r--r--net/ipv4/af_inet.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index b7b7278d801..45ced52c03d 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -218,13 +218,23 @@ out:
return err;
}
-u32 inet_ehash_secret;
+u32 inet_ehash_secret __read_mostly;
EXPORT_SYMBOL(inet_ehash_secret);
+/*
+ * inet_ehash_secret must be set exactly once
+ * Instead of using a dedicated spinlock, we (ab)use inetsw_lock
+ */
void build_ehash_secret(void)
{
- while (!inet_ehash_secret)
- get_random_bytes(&inet_ehash_secret, 4);
+ u32 rnd;
+ do {
+ get_random_bytes(&rnd, sizeof(rnd));
+ } while (rnd == 0);
+ spin_lock_bh(&inetsw_lock);
+ if (!inet_ehash_secret)
+ inet_ehash_secret = rnd;
+ spin_unlock_bh(&inetsw_lock);
}
EXPORT_SYMBOL(build_ehash_secret);