diff options
| author | Eric Biggers <ebiggers@kernel.org> | 2025-08-18 13:27:24 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-08-28 16:31:03 +0200 |
| commit | b3967c493799e63f648e9c7b6cb063aa2aed04e7 (patch) | |
| tree | a3a2aee2aaf579420438fdedff81e54e8441b198 | |
| parent | 786f6314604b34c3e7de5f733f4e08e35c448a50 (diff) | |
ipv6: sr: Fix MAC comparison to be constant-time
commit a458b2902115b26a25d67393b12ddd57d1216aaa upstream.
To prevent timing attacks, MACs need to be compared in constant time.
Use the appropriate helper function for this.
Fixes: bf355b8d2c30 ("ipv6: sr: add core files for SR HMAC support")
Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Reviewed-by: Andrea Mayer <andrea.mayer@uniroma2.it>
Link: https://patch.msgid.link/20250818202724.15713-1-ebiggers@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/ipv6/seg6_hmac.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv6/seg6_hmac.c b/net/ipv6/seg6_hmac.c index bbf5b84a70fc..e955008e732b 100644 --- a/net/ipv6/seg6_hmac.c +++ b/net/ipv6/seg6_hmac.c @@ -35,6 +35,7 @@ #include <net/xfrm.h> #include <crypto/hash.h> +#include <crypto/utils.h> #include <net/seg6.h> #include <net/genetlink.h> #include <net/seg6_hmac.h> @@ -271,7 +272,7 @@ bool seg6_hmac_validate_skb(struct sk_buff *skb) if (seg6_hmac_compute(hinfo, srh, &ipv6_hdr(skb)->saddr, hmac_output)) return false; - if (memcmp(hmac_output, tlv->hmac, SEG6_HMAC_FIELD_LEN) != 0) + if (crypto_memneq(hmac_output, tlv->hmac, SEG6_HMAC_FIELD_LEN)) return false; return true; |