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linux/net/tls
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Sabrina Dubroca 6db959c82e 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: 3c4d755915 ("tls: kernel TLS support")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
History 2018-01-17 16:16:04 -05:00
..
Kconfig tls: update Kconfig 2017-06-17 22:56:46 -04:00
Makefile tls: kernel TLS support 2017-06-15 12:12:40 -04:00
tls_main.c tls: reset crypto_info when do_tls_setsockopt_tx fails 2018-01-17 16:16:04 -05:00
tls_sw.c tls: fix sw_ctx leak 2018-01-17 16:16:03 -05:00