crypto/bn/bn_gf2m.c:733: error: BUFFER_OVERRUN_L3
  Offset: [-1, +oo] Size: [1, +oo] by call to `BN_priv_rand`.
Showing all 14 steps of the trace


crypto/bn/bn_gf2m.c:733:30: Call
731.       /* generate blinding value */
732.       do {
733.           if (!BN_priv_rand(b, BN_num_bits(p) - 1,
                                    ^
734.                             BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY))
735.               goto err;

crypto/bn/bn_lib.c:140:9: Assignment
  138.   
  139.       if (BN_is_zero(a))
  140.           return 0;
                 ^
  141.       return ((i * BN_BITS2) + BN_num_bits_word(a->d[i]));
  142.   }

crypto/bn/bn_gf2m.c:733:14: Call
731.       /* generate blinding value */
732.       do {
733.           if (!BN_priv_rand(b, BN_num_bits(p) - 1,
                    ^
734.                             BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY))
735.               goto err;

crypto/bn/bn_rand.c:107:1: Parameter `bits`
  105.   }
  106.   
  107. > int BN_priv_rand(BIGNUM *rnd, int bits, int top, int bottom)
  108.   {
  109.       return bnrand(PRIVATE, rnd, bits, top, bottom);

crypto/bn/bn_rand.c:109:12: Call
  107.   int BN_priv_rand(BIGNUM *rnd, int bits, int top, int bottom)
  108.   {
  109.       return bnrand(PRIVATE, rnd, bits, top, bottom);
                    ^
  110.   }
  111.   

crypto/bn/bn_rand.c:57:14: <Offset trace>
55.           unsigned char c;
56.   
57.           for (i = 0; i < bytes; i++) {
                   ^
58.               if (RAND_bytes(&c, 1) <= 0)
59.                   goto err;

crypto/bn/bn_rand.c:57:14: Assignment
    55.           unsigned char c;
    56.   
    57.           for (i = 0; i < bytes; i++) {
                       ^
    58.               if (RAND_bytes(&c, 1) <= 0)
    59.                   goto err;

crypto/bn/bn_rand.c:21:1: <Length trace>
19.   } BNRAND_FLAG;
20.   
21. > static int bnrand(BNRAND_FLAG flag, BIGNUM *rnd, int bits, int top, int bottom)
22.   {
23.       unsigned char *buf = NULL;

crypto/bn/bn_rand.c:21:1: Parameter `bits`
    19.   } BNRAND_FLAG;
    20.   
    21. > static int bnrand(BNRAND_FLAG flag, BIGNUM *rnd, int bits, int top, int bottom)
    22.   {
    23.       unsigned char *buf = NULL;

crypto/bn/bn_rand.c:35:5: Assignment
    33.           goto toosmall;
    34.   
    35.       bytes = (bits + 7) / 8;
              ^
    36.       bit = (bits - 1) % 8;
    37.       mask = 0xff << (bit + 1);

crypto/bn/bn_rand.c:39:11: Call
    37.       mask = 0xff << (bit + 1);
    38.   
    39.       buf = OPENSSL_malloc(bytes);
                    ^
    40.       if (buf == NULL) {
    41.           BNerr(BN_F_BNRAND, ERR_R_MALLOC_FAILURE);

crypto/mem.c:201:9: Assignment
      199.   
      200.       if (num == 0)
      201.           return NULL;
                     ^
      202.   
      203.       FAILTEST();

crypto/bn/bn_rand.c:39:5: Assignment
    37.       mask = 0xff << (bit + 1);
    38.   
    39.       buf = OPENSSL_malloc(bytes);
              ^
    40.       if (buf == NULL) {
    41.           BNerr(BN_F_BNRAND, ERR_R_MALLOC_FAILURE);

crypto/bn/bn_rand.c:83:9: Array access: Offset: [-1, +oo] Size: [1, +oo] by call to `BN_priv_rand` 
    81.       buf[0] &= ~mask;
    82.       if (bottom)                 /* set bottom bit if requested */
    83.           buf[bytes - 1] |= 1;
                  ^
    84.       if (!BN_bin2bn(buf, bytes, rnd))
    85.           goto err;

static int bnrand(BNRAND_FLAG flag, BIGNUM *rnd, int bits, int top, int bottom)
{
    unsigned char *buf = NULL;
    int b, ret = 0, bit, bytes, mask;
    if (bits == 0) {
        if (top != BN_RAND_TOP_ANY || bottom != BN_RAND_BOTTOM_ANY)
            goto toosmall;
        BN_zero(rnd);
        return 1;
    }
    if (bits < 0 || (bits == 1 && top > 0))
        goto toosmall;
    bytes = (bits + 7) / 8;
    bit = (bits - 1) % 8;
    mask = 0xff << (bit + 1);
    buf = OPENSSL_malloc(bytes);
    if (buf == NULL) {
        BNerr(BN_F_BNRAND, ERR_R_MALLOC_FAILURE);
        goto err;
    }
    b = flag == NORMAL ? RAND_bytes(buf, bytes) : RAND_priv_bytes(buf, bytes);
    if (b <= 0)
        goto err;
    if (flag == TESTING) {
        int i;
        unsigned char c;
        for (i = 0; i < bytes; i++) {
            if (RAND_bytes(&c, 1) <= 0)
                goto err;
            if (c >= 128 && i > 0)
                buf[i] = buf[i - 1];
            else if (c < 42)
                buf[i] = 0;
            else if (c < 84)
                buf[i] = 255;
        }
    }
    if (top >= 0) {
        if (top) {
            if (bit == 0) {
                buf[0] = 1;
                buf[1] |= 0x80;
            } else {
                buf[0] |= (3 << (bit - 1));
            }
        } else {
            buf[0] |= (1 << bit);
        }
    }
    buf[0] &= ~mask;
    if (bottom)
        buf[bytes - 1] |= 1;
    if (!BN_bin2bn(buf, bytes, rnd))
        goto err;
    ret = 1;
 err:
    OPENSSL_clear_free(buf, bytes);
    bn_check_top(rnd);
    return ret;
toosmall:
    BNerr(BN_F_BNRAND, BN_R_BITS_TOO_SMALL);
    return 0;
}
['int BN_GF2m_mod_inv(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)\n{\n    BIGNUM *b = NULL;\n    int ret = 0;\n    BN_CTX_start(ctx);\n    if ((b = BN_CTX_get(ctx)) == NULL)\n        goto err;\n    do {\n        if (!BN_priv_rand(b, BN_num_bits(p) - 1,\n                          BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY))\n            goto err;\n    } while (BN_is_zero(b));\n    if (!BN_GF2m_mod_mul(r, a, b, p, ctx))\n        goto err;\n    if (!BN_GF2m_mod_inv_vartime(r, r, p, ctx))\n        goto err;\n    if (!BN_GF2m_mod_mul(r, r, b, p, ctx))\n        goto err;\n    ret = 1;\n err:\n    BN_CTX_end(ctx);\n    return ret;\n}', 'int BN_num_bits(const BIGNUM *a)\n{\n    int i = a->top - 1;\n    bn_check_top(a);\n    if (BN_is_zero(a))\n        return 0;\n    return ((i * BN_BITS2) + BN_num_bits_word(a->d[i]));\n}', 'int BN_priv_rand(BIGNUM *rnd, int bits, int top, int bottom)\n{\n    return bnrand(PRIVATE, rnd, bits, top, bottom);\n}', 'static int bnrand(BNRAND_FLAG flag, BIGNUM *rnd, int bits, int top, int bottom)\n{\n    unsigned char *buf = NULL;\n    int b, ret = 0, bit, bytes, mask;\n    if (bits == 0) {\n        if (top != BN_RAND_TOP_ANY || bottom != BN_RAND_BOTTOM_ANY)\n            goto toosmall;\n        BN_zero(rnd);\n        return 1;\n    }\n    if (bits < 0 || (bits == 1 && top > 0))\n        goto toosmall;\n    bytes = (bits + 7) / 8;\n    bit = (bits - 1) % 8;\n    mask = 0xff << (bit + 1);\n    buf = OPENSSL_malloc(bytes);\n    if (buf == NULL) {\n        BNerr(BN_F_BNRAND, ERR_R_MALLOC_FAILURE);\n        goto err;\n    }\n    b = flag == NORMAL ? RAND_bytes(buf, bytes) : RAND_priv_bytes(buf, bytes);\n    if (b <= 0)\n        goto err;\n    if (flag == TESTING) {\n        int i;\n        unsigned char c;\n        for (i = 0; i < bytes; i++) {\n            if (RAND_bytes(&c, 1) <= 0)\n                goto err;\n            if (c >= 128 && i > 0)\n                buf[i] = buf[i - 1];\n            else if (c < 42)\n                buf[i] = 0;\n            else if (c < 84)\n                buf[i] = 255;\n        }\n    }\n    if (top >= 0) {\n        if (top) {\n            if (bit == 0) {\n                buf[0] = 1;\n                buf[1] |= 0x80;\n            } else {\n                buf[0] |= (3 << (bit - 1));\n            }\n        } else {\n            buf[0] |= (1 << bit);\n        }\n    }\n    buf[0] &= ~mask;\n    if (bottom)\n        buf[bytes - 1] |= 1;\n    if (!BN_bin2bn(buf, bytes, rnd))\n        goto err;\n    ret = 1;\n err:\n    OPENSSL_clear_free(buf, bytes);\n    bn_check_top(rnd);\n    return ret;\ntoosmall:\n    BNerr(BN_F_BNRAND, BN_R_BITS_TOO_SMALL);\n    return 0;\n}', 'void *CRYPTO_malloc(size_t num, const char *file, int line)\n{\n    void *ret = NULL;\n    INCREMENT(malloc_count);\n    if (malloc_impl != NULL && malloc_impl != CRYPTO_malloc)\n        return malloc_impl(num, file, line);\n    if (num == 0)\n        return NULL;\n    FAILTEST();\n    if (allow_customize) {\n        allow_customize = 0;\n    }\n#ifndef OPENSSL_NO_CRYPTO_MDEBUG\n    if (call_malloc_debug) {\n        CRYPTO_mem_debug_malloc(NULL, num, 0, file, line);\n        ret = malloc(num);\n        CRYPTO_mem_debug_malloc(ret, num, 1, file, line);\n    } else {\n        ret = malloc(num);\n    }\n#else\n    (void)(file); (void)(line);\n    ret = malloc(num);\n#endif\n    return ret;\n}']