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| author |   Eric Dumazet <edumazet@google.com> | 2021-08-25 16:17:29 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2021-08-26 10:20:34 +0100 |
| commit | 6457378fe796815c973f631a1904e147d6ee33b1 (patch) | |
| tree | a1011494e41faacba2c0d400f5c7554028d83489 /net/ipv4/route.c | |
| parent | ipv6: use siphash in rt6_exception_hash() (diff) | |
| download | linux-dev-6457378fe796815c973f631a1904e147d6ee33b1.tar.xz linux-dev-6457378fe796815c973f631a1904e147d6ee33b1.zip | |
ipv4: use siphash instead of Jenkins in fnhe_hashfun()
A group of security researchers brought to our attention
the weakness of hash function used in fnhe_hashfun().
Lets use siphash instead of Jenkins Hash, to considerably
reduce security risks.
Also remove the inline keyword, this really is distracting.
Fixes: d546c621542d ("ipv4: harden fnhe_hashfun()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Keyu Man <kman001@ucr.edu>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/route.c')
| -rw-r--r-- | net/ipv4/route.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 99c06944501a..a6f20ee35335 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -600,14 +600,14 @@ static struct fib_nh_exception *fnhe_oldest(struct fnhe_hash_bucket *hash) return oldest; } -static inline u32 fnhe_hashfun(__be32 daddr) +static u32 fnhe_hashfun(__be32 daddr) { - static u32 fnhe_hashrnd __read_mostly; - u32 hval; + static siphash_key_t fnhe_hash_key __read_mostly; + u64 hval; - net_get_random_once(&fnhe_hashrnd, sizeof(fnhe_hashrnd)); - hval = jhash_1word((__force u32)daddr, fnhe_hashrnd); - return hash_32(hval, FNHE_HASH_SHIFT); + net_get_random_once(&fnhe_hash_key, sizeof(fnhe_hash_key)); + hval = siphash_1u32((__force u32)daddr, &fnhe_hash_key); + return hash_64(hval, FNHE_HASH_SHIFT); } static void fill_route_from_fnhe(struct rtable *rt, struct fib_nh_exception *fnhe) |