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authorSabrina Dubroca <sd@queasysnail.net>2018-01-16 16:04:28 +0100
committerDavid S. Miller <davem@davemloft.net>2018-01-17 22:16:04 +0100
commit6db959c82eb039a151d95a0f8b7dea643657327a (patch)
tree1004c0d1cbf18fa4ab30034bd6cd38205cc32e77 /net/tls
parenttls: return -EBUSY if crypto_info is already set (diff)
downloadlinux-6db959c82eb039a151d95a0f8b7dea643657327a.tar.xz
linux-6db959c82eb039a151d95a0f8b7dea643657327a.zip
tls: reset crypto_info when do_tls_setsockopt_tx fails
The current code copies directly from userspace to ctx->crypto_send, but doesn't always reinitialize it to 0 on failure. This causes any subsequent attempt to use this setsockopt to fail because of the TLS_CRYPTO_INFO_READY check, eventhough crypto_info is not actually ready. This should result in a correctly set up socket after the 3rd call, but currently it does not: size_t s = sizeof(struct tls12_crypto_info_aes_gcm_128); struct tls12_crypto_info_aes_gcm_128 crypto_good = { .info.version = TLS_1_2_VERSION, .info.cipher_type = TLS_CIPHER_AES_GCM_128, }; struct tls12_crypto_info_aes_gcm_128 crypto_bad_type = crypto_good; crypto_bad_type.info.cipher_type = 42; setsockopt(sock, SOL_TLS, TLS_TX, &crypto_bad_type, s); setsockopt(sock, SOL_TLS, TLS_TX, &crypto_good, s - 1); setsockopt(sock, SOL_TLS, TLS_TX, &crypto_good, s); Fixes: 3c4d7559159b ("tls: kernel TLS support") Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tls')
-rw-r--r--net/tls/tls_main.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index 8e9cbfd21423..736719c8314e 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -388,7 +388,7 @@ static int do_tls_setsockopt_tx(struct sock *sk, char __user *optval,
case TLS_CIPHER_AES_GCM_128: {
if (optlen != sizeof(struct tls12_crypto_info_aes_gcm_128)) {
rc = -EINVAL;
- goto out;
+ goto err_crypto_info;
}
rc = copy_from_user(crypto_info + 1, optval + sizeof(*crypto_info),
optlen - sizeof(*crypto_info));
@@ -400,7 +400,7 @@ static int do_tls_setsockopt_tx(struct sock *sk, char __user *optval,
}
default:
rc = -EINVAL;
- goto out;
+ goto err_crypto_info;
}
/* currently SW is default, we will have ethtool in future */