ssl/record/ssl3_record.c:440: error: BUFFER_OVERRUN_L2
  Offset added: [0, 34112] Size: 128 by call to `ssl3_cbc_copy_mac`.
Showing all 9 steps of the trace


ssl/record/ssl3_record.c:186:1: Parameter `s->rlayer.rrec.length`
184.    */
185.   /* used only by ssl3_read_bytes */
186. > int ssl3_get_record(SSL *s)
187.   {
188.       int ssl_major, ssl_minor, al;

ssl/record/ssl3_record.c:360:5: Assignment
358.       /* decrypt in place in 'rr->input' */
359.       rr->data = rr->input;
360.       rr->orig_len = rr->length;
           ^
361.       /*
362.        * If in encrypt-then-mac mode calculate mac from encrypted record. All

ssl/record/ssl3_record.c:440:13: Call
438.                */
439.               mac = mac_tmp;
440.               ssl3_cbc_copy_mac(mac_tmp, rr, mac_size);
                   ^
441.               rr->length -= mac_size;
442.           } else {

ssl/record/ssl3_record.c:1141:1: <Offset trace>
1139.   #define CBC_MAC_ROTATE_IN_PLACE
1140.   
1141. > void ssl3_cbc_copy_mac(unsigned char *out,
1142.                          const SSL3_RECORD *rec, unsigned md_size)
1143.   {

ssl/record/ssl3_record.c:1141:1: Parameter `md_size`
  1139.   #define CBC_MAC_ROTATE_IN_PLACE
  1140.   
  1141. > void ssl3_cbc_copy_mac(unsigned char *out,
  1142.                          const SSL3_RECORD *rec, unsigned md_size)
  1143.   {

ssl/record/ssl3_record.c:1141:1: <Length trace>
1139.   #define CBC_MAC_ROTATE_IN_PLACE
1140.   
1141. > void ssl3_cbc_copy_mac(unsigned char *out,
1142.                          const SSL3_RECORD *rec, unsigned md_size)
1143.   {

ssl/record/ssl3_record.c:1141:1: Array declaration
  1139.   #define CBC_MAC_ROTATE_IN_PLACE
  1140.   
  1141. > void ssl3_cbc_copy_mac(unsigned char *out,
  1142.                          const SSL3_RECORD *rec, unsigned md_size)
  1143.   {

ssl/record/ssl3_record.c:1169:5: Assignment
  1167.   
  1168.   #if defined(CBC_MAC_ROTATE_IN_PLACE)
  1169.       rotated_mac = rotated_mac_buf + ((0 - (size_t)rotated_mac_buf) & 63);
              ^
  1170.   #endif
  1171.   

ssl/record/ssl3_record.c:1187:5: Array access: Offset added: [0, 34112] Size: 128 by call to `ssl3_cbc_copy_mac` 
  1185.       rotate_offset = (div_spoiler + mac_start - scan_start) % md_size;
  1186.   
  1187.       memset(rotated_mac, 0, md_size);
              ^
  1188.       for (i = scan_start, j = 0; i < rec->orig_len; i++) {
  1189.           unsigned char mac_started = constant_time_ge_8(i, mac_start);

void ssl3_cbc_copy_mac(unsigned char *out,
                       const SSL3_RECORD *rec, unsigned md_size)
{
#if defined(CBC_MAC_ROTATE_IN_PLACE)
    unsigned char rotated_mac_buf[64 + EVP_MAX_MD_SIZE];
    unsigned char *rotated_mac;
#else
    unsigned char rotated_mac[EVP_MAX_MD_SIZE];
#endif
    unsigned mac_end = rec->length;
    unsigned mac_start = mac_end - md_size;
    unsigned scan_start = 0;
    unsigned i, j;
    unsigned div_spoiler;
    unsigned rotate_offset;
    OPENSSL_assert(rec->orig_len >= md_size);
    OPENSSL_assert(md_size <= EVP_MAX_MD_SIZE);
#if defined(CBC_MAC_ROTATE_IN_PLACE)
    rotated_mac = rotated_mac_buf + ((0 - (size_t)rotated_mac_buf) & 63);
#endif
    if (rec->orig_len > md_size + 255 + 1)
        scan_start = rec->orig_len - (md_size + 255 + 1);
    div_spoiler = md_size >> 1;
    div_spoiler <<= (sizeof(div_spoiler) - 1) * 8;
    rotate_offset = (div_spoiler + mac_start - scan_start) % md_size;
    memset(rotated_mac, 0, md_size);
    for (i = scan_start, j = 0; i < rec->orig_len; i++) {
        unsigned char mac_started = constant_time_ge_8(i, mac_start);
        unsigned char mac_ended = constant_time_ge_8(i, mac_end);
        unsigned char b = rec->data[i];
        rotated_mac[j++] |= b & mac_started & ~mac_ended;
        j &= constant_time_lt(j, md_size);
    }
#if defined(CBC_MAC_ROTATE_IN_PLACE)
    j = 0;
    for (i = 0; i < md_size; i++) {
        ((volatile unsigned char *)rotated_mac)[rotate_offset ^ 32];
        out[j++] = rotated_mac[rotate_offset++];
        rotate_offset &= constant_time_lt(rotate_offset, md_size);
    }
#else
    memset(out, 0, md_size);
    rotate_offset = md_size - rotate_offset;
    rotate_offset &= constant_time_lt(rotate_offset, md_size);
    for (i = 0; i < md_size; i++) {
        for (j = 0; j < md_size; j++)
            out[j] |= rotated_mac[i] & constant_time_eq_8(j, rotate_offset);
        rotate_offset++;
        rotate_offset &= constant_time_lt(rotate_offset, md_size);
    }
#endif
}
['int ssl3_get_record(SSL *s)\n{\n    int ssl_major, ssl_minor, al;\n    int enc_err, n, i, ret = -1;\n    SSL3_RECORD *rr;\n    SSL_SESSION *sess;\n    unsigned char *p;\n    unsigned char md[EVP_MAX_MD_SIZE];\n    short version;\n    unsigned mac_size;\n    size_t extra;\n    unsigned empty_record_count = 0;\n    rr = RECORD_LAYER_get_rrec(&s->rlayer);\n    sess = s->session;\n    if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)\n        extra = SSL3_RT_MAX_EXTRA;\n    else\n        extra = 0;\n    if (extra && !s->s3->init_extra) {\n        SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);\n        return -1;\n    }\n again:\n    if ((RECORD_LAYER_get_rstate(&s->rlayer) != SSL_ST_READ_BODY) ||\n        (RECORD_LAYER_get_packet_length(&s->rlayer) < SSL3_RT_HEADER_LENGTH)) {\n        n = ssl3_read_n(s, SSL3_RT_HEADER_LENGTH,\n            SSL3_BUFFER_get_len(&s->rlayer.rbuf), 0);\n        if (n <= 0)\n            return (n);\n        RECORD_LAYER_set_rstate(&s->rlayer, SSL_ST_READ_BODY);\n        p = RECORD_LAYER_get_packet(&s->rlayer);\n        if (s->first_packet && s->server && !s->read_hash && !s->enc_read_ctx\n                && (p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO)) {\n            rr->type = SSL3_RT_HANDSHAKE;\n            rr->rec_version = SSL2_VERSION;\n            rr->length = ((p[0] & 0x7f) << 8) | p[1];\n            if (rr->length > SSL3_BUFFER_get_len(&s->rlayer.rbuf)\n                                    - SSL2_RT_HEADER_LENGTH) {\n                al = SSL_AD_RECORD_OVERFLOW;\n                SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_PACKET_LENGTH_TOO_LONG);\n                goto f_err;\n            }\n            if (rr->length < MIN_SSL2_RECORD_LEN) {\n                al = SSL_AD_HANDSHAKE_FAILURE;\n                SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_LENGTH_TOO_SHORT);\n                goto f_err;\n            }\n        } else {\n            if (s->msg_callback)\n                s->msg_callback(0, 0, SSL3_RT_HEADER, p, 5, s,\n                                s->msg_callback_arg);\n            rr->type = *(p++);\n            ssl_major = *(p++);\n            ssl_minor = *(p++);\n            version = (ssl_major << 8) | ssl_minor;\n            rr->rec_version = version;\n            n2s(p, rr->length);\n            if (!s->first_packet && version != s->version) {\n                SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_WRONG_VERSION_NUMBER);\n                if ((s->version & 0xFF00) == (version & 0xFF00)\n                    && !s->enc_write_ctx && !s->write_hash) {\n                    if (rr->type == SSL3_RT_ALERT) {\n                         goto err;\n                    }\n                    s->version = (unsigned short)version;\n                }\n                al = SSL_AD_PROTOCOL_VERSION;\n                goto f_err;\n            }\n            if ((version >> 8) != SSL3_VERSION_MAJOR) {\n                SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_WRONG_VERSION_NUMBER);\n                goto err;\n            }\n            if (rr->length >\n                    SSL3_BUFFER_get_len(&s->rlayer.rbuf)\n                    - SSL3_RT_HEADER_LENGTH) {\n                al = SSL_AD_RECORD_OVERFLOW;\n                SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_PACKET_LENGTH_TOO_LONG);\n                goto f_err;\n            }\n        }\n    }\n    if (rr->rec_version == SSL2_VERSION) {\n        i = rr->length + SSL2_RT_HEADER_LENGTH - SSL3_RT_HEADER_LENGTH;\n    } else {\n        i = rr->length;\n    }\n    if (i > 0) {\n        n = ssl3_read_n(s, i, i, 1);\n        if (n <= 0)\n            return (n);\n    }\n    RECORD_LAYER_set_rstate(&s->rlayer, SSL_ST_READ_HEADER);\n    if(rr->rec_version == SSL2_VERSION) {\n        rr->input = &(RECORD_LAYER_get_packet(&s->rlayer)[SSL2_RT_HEADER_LENGTH]);\n    } else {\n        rr->input = &(RECORD_LAYER_get_packet(&s->rlayer)[SSL3_RT_HEADER_LENGTH]);\n    }\n    if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH + extra) {\n        al = SSL_AD_RECORD_OVERFLOW;\n        SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_ENCRYPTED_LENGTH_TOO_LONG);\n        goto f_err;\n    }\n    rr->data = rr->input;\n    rr->orig_len = rr->length;\n    if (SSL_USE_ETM(s) && s->read_hash) {\n        unsigned char *mac;\n        mac_size = EVP_MD_CTX_size(s->read_hash);\n        OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE);\n        if (rr->length < mac_size) {\n            al = SSL_AD_DECODE_ERROR;\n            SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_LENGTH_TOO_SHORT);\n            goto f_err;\n        }\n        rr->length -= mac_size;\n        mac = rr->data + rr->length;\n        i = s->method->ssl3_enc->mac(s, md, 0   );\n        if (i < 0 || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0) {\n            al = SSL_AD_BAD_RECORD_MAC;\n            SSLerr(SSL_F_SSL3_GET_RECORD,\n                   SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);\n            goto f_err;\n        }\n    }\n    enc_err = s->method->ssl3_enc->enc(s, 0);\n    if (enc_err == 0) {\n        al = SSL_AD_DECRYPTION_FAILED;\n        SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);\n        goto f_err;\n    }\n#ifdef TLS_DEBUG\n    printf("dec %d\\n", rr->length);\n    {\n        unsigned int z;\n        for (z = 0; z < rr->length; z++)\n            printf("%02X%c", rr->data[z], ((z + 1) % 16) ? \' \' : \'\\n\');\n    }\n    printf("\\n");\n#endif\n    if ((sess != NULL) &&\n        (s->enc_read_ctx != NULL) &&\n        (EVP_MD_CTX_md(s->read_hash) != NULL) && !SSL_USE_ETM(s)) {\n        unsigned char *mac = NULL;\n        unsigned char mac_tmp[EVP_MAX_MD_SIZE];\n        mac_size = EVP_MD_CTX_size(s->read_hash);\n        OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE);\n        if (rr->orig_len < mac_size ||\n            (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE &&\n             rr->orig_len < mac_size + 1)) {\n            al = SSL_AD_DECODE_ERROR;\n            SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_LENGTH_TOO_SHORT);\n            goto f_err;\n        }\n        if (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE) {\n            mac = mac_tmp;\n            ssl3_cbc_copy_mac(mac_tmp, rr, mac_size);\n            rr->length -= mac_size;\n        } else {\n            rr->length -= mac_size;\n            mac = &rr->data[rr->length];\n        }\n        i = s->method->ssl3_enc->mac(s, md, 0   );\n        if (i < 0 || mac == NULL\n            || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0)\n            enc_err = -1;\n        if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH + extra + mac_size)\n            enc_err = -1;\n    }\n    if (enc_err < 0) {\n        al = SSL_AD_BAD_RECORD_MAC;\n        SSLerr(SSL_F_SSL3_GET_RECORD,\n               SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);\n        goto f_err;\n    }\n    if (s->expand != NULL) {\n        if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH + extra) {\n            al = SSL_AD_RECORD_OVERFLOW;\n            SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_COMPRESSED_LENGTH_TOO_LONG);\n            goto f_err;\n        }\n        if (!ssl3_do_uncompress(s)) {\n            al = SSL_AD_DECOMPRESSION_FAILURE;\n            SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BAD_DECOMPRESSION);\n            goto f_err;\n        }\n    }\n    if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH + extra) {\n        al = SSL_AD_RECORD_OVERFLOW;\n        SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_DATA_LENGTH_TOO_LONG);\n        goto f_err;\n    }\n    rr->off = 0;\n    RECORD_LAYER_reset_packet_length(&s->rlayer);\n    if (rr->length == 0) {\n        empty_record_count++;\n        if (empty_record_count > MAX_EMPTY_RECORDS) {\n            al = SSL_AD_UNEXPECTED_MESSAGE;\n            SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_RECORD_TOO_SMALL);\n            goto f_err;\n        }\n        goto again;\n    }\n    return (1);\n f_err:\n    ssl3_send_alert(s, SSL3_AL_FATAL, al);\n err:\n    return (ret);\n}', 'void ssl3_cbc_copy_mac(unsigned char *out,\n                       const SSL3_RECORD *rec, unsigned md_size)\n{\n#if defined(CBC_MAC_ROTATE_IN_PLACE)\n    unsigned char rotated_mac_buf[64 + EVP_MAX_MD_SIZE];\n    unsigned char *rotated_mac;\n#else\n    unsigned char rotated_mac[EVP_MAX_MD_SIZE];\n#endif\n    unsigned mac_end = rec->length;\n    unsigned mac_start = mac_end - md_size;\n    unsigned scan_start = 0;\n    unsigned i, j;\n    unsigned div_spoiler;\n    unsigned rotate_offset;\n    OPENSSL_assert(rec->orig_len >= md_size);\n    OPENSSL_assert(md_size <= EVP_MAX_MD_SIZE);\n#if defined(CBC_MAC_ROTATE_IN_PLACE)\n    rotated_mac = rotated_mac_buf + ((0 - (size_t)rotated_mac_buf) & 63);\n#endif\n    if (rec->orig_len > md_size + 255 + 1)\n        scan_start = rec->orig_len - (md_size + 255 + 1);\n    div_spoiler = md_size >> 1;\n    div_spoiler <<= (sizeof(div_spoiler) - 1) * 8;\n    rotate_offset = (div_spoiler + mac_start - scan_start) % md_size;\n    memset(rotated_mac, 0, md_size);\n    for (i = scan_start, j = 0; i < rec->orig_len; i++) {\n        unsigned char mac_started = constant_time_ge_8(i, mac_start);\n        unsigned char mac_ended = constant_time_ge_8(i, mac_end);\n        unsigned char b = rec->data[i];\n        rotated_mac[j++] |= b & mac_started & ~mac_ended;\n        j &= constant_time_lt(j, md_size);\n    }\n#if defined(CBC_MAC_ROTATE_IN_PLACE)\n    j = 0;\n    for (i = 0; i < md_size; i++) {\n        ((volatile unsigned char *)rotated_mac)[rotate_offset ^ 32];\n        out[j++] = rotated_mac[rotate_offset++];\n        rotate_offset &= constant_time_lt(rotate_offset, md_size);\n    }\n#else\n    memset(out, 0, md_size);\n    rotate_offset = md_size - rotate_offset;\n    rotate_offset &= constant_time_lt(rotate_offset, md_size);\n    for (i = 0; i < md_size; i++) {\n        for (j = 0; j < md_size; j++)\n            out[j] |= rotated_mac[i] & constant_time_eq_8(j, rotate_offset);\n        rotate_offset++;\n        rotate_offset &= constant_time_lt(rotate_offset, md_size);\n    }\n#endif\n}']