test/bntest.c:897: error: BUFFER_OVERRUN_L3
  Offset added: [8, +oo] Size: [0, 536870848] by call to `BN_mod_exp_recp`.
Showing all 12 steps of the trace


test/bntest.c:877:10: Call
875.        */
876.   
877.       if (!TEST_true(BN_generate_prime_ex(b, 512, 0, NULL, NULL, NULL)))
                ^
878.           goto err;
879.       BN_set_negative(b, rand_neg());

crypto/bn/bn_prime.c:52:1: Parameter `ret->top`
  50.   }
  51.   
  52. > int BN_generate_prime_ex(BIGNUM *ret, int bits, int safe,
  53.                            const BIGNUM *add, const BIGNUM *rem, BN_GENCB *cb)
  54.   {

test/bntest.c:897:14: Call
895.           BN_set_negative(b, 0);
896.   
897.           if (!TEST_true(BN_mod_exp_recp(r, a, t, b, ctx)))
                    ^
898.               goto err;
899.           BN_set_negative(b, 1);

crypto/bn/bn_exp.c:161:1: Parameter `m->top`
  159.   }
  160.   
  161. > int BN_mod_exp_recp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
  162.                       const BIGNUM *m, BN_CTX *ctx)
  163.   {

crypto/bn/bn_exp.c:200:14: Call
  198.       if (m->neg) {
  199.           /* ignore sign of 'm' */
  200.           if (!BN_copy(aa, m))
                      ^
  201.               goto err;
  202.           aa->neg = 0;

crypto/bn/bn_lib.c:312:1: <Offset trace>
310.   }
311.   
312. > BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b)
313.   {
314.       bn_check_top(b);

crypto/bn/bn_lib.c:312:1: Parameter `b->top`
    310.   }
    311.   
    312. > BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b)
    313.   {
    314.       bn_check_top(b);

crypto/bn/bn_lib.c:312:1: <Length trace>
310.   }
311.   
312. > BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b)
313.   {
314.       bn_check_top(b);

crypto/bn/bn_lib.c:312:1: Parameter `*a->d`
    310.   }
    311.   
    312. > BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b)
    313.   {
    314.       bn_check_top(b);

crypto/bn/bn_lib.c:318:9: Call
    316.       if (a == b)
    317.           return a;
    318.       if (bn_wexpand(a, b->top) == NULL)
                   ^
    319.           return NULL;
    320.   

crypto/bn/bn_lib.c:937:1: Parameter `*a->d`
      935.   }
      936.   
      937. > BIGNUM *bn_wexpand(BIGNUM *a, int words)
      938.   {
      939.       return (words <= a->dmax) ? a : bn_expand2(a, words);

crypto/bn/bn_lib.c:322:9: Array access: Offset added: [8, +oo] Size: [0, 536870848] by call to `BN_mod_exp_recp` 
    320.   
    321.       if (b->top > 0)
    322.           memcpy(a->d, b->d, sizeof(b->d[0]) * b->top);
                   ^
    323.   
    324.       a->top = b->top;

BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b)
{
    bn_check_top(b);
    if (a == b)
        return a;
    if (bn_wexpand(a, b->top) == NULL)
        return NULL;
    if (b->top > 0)
        memcpy(a->d, b->d, sizeof(b->d[0]) * b->top);
    a->top = b->top;
    a->neg = b->neg;
    bn_check_top(a);
    return a;
}
['static int test_kronecker(void)\n{\n    BIGNUM *a = NULL, *b = NULL, *r = NULL, *t = NULL;\n    int i, legendre, kronecker, st = 0;\n    if (!TEST_ptr(a = BN_new())\n            || !TEST_ptr(b = BN_new())\n            || !TEST_ptr(r = BN_new())\n            || !TEST_ptr(t = BN_new()))\n        goto err;\n    if (!TEST_true(BN_generate_prime_ex(b, 512, 0, NULL, NULL, NULL)))\n        goto err;\n    BN_set_negative(b, rand_neg());\n    for (i = 0; i < NUM0; i++) {\n        if (!TEST_true(BN_bntest_rand(a, 512, 0, 0)))\n            goto err;\n        BN_set_negative(a, rand_neg());\n        if (!TEST_true(BN_copy(t, b)))\n            goto err;\n        BN_set_negative(t, 0);\n        if (!TEST_true(BN_sub_word(t, 1)))\n            goto err;\n        if (!TEST_true(BN_rshift1(t, t)))\n            goto err;\n        BN_set_negative(b, 0);\n        if (!TEST_true(BN_mod_exp_recp(r, a, t, b, ctx)))\n            goto err;\n        BN_set_negative(b, 1);\n        if (BN_is_word(r, 1))\n            legendre = 1;\n        else if (BN_is_zero(r))\n            legendre = 0;\n        else {\n            if (!TEST_true(BN_add_word(r, 1)))\n                goto err;\n            if (!TEST_int_eq(BN_ucmp(r, b), 0)) {\n                TEST_info("Legendre symbol computation failed");\n                goto err;\n            }\n            legendre = -1;\n        }\n        if (!TEST_int_ge(kronecker = BN_kronecker(a, b, ctx), -1))\n            goto err;\n        if (BN_is_negative(a) && BN_is_negative(b))\n            kronecker = -kronecker;\n        if (!TEST_int_eq(legendre, kronecker))\n            goto err;\n    }\n    st = 1;\n err:\n    BN_free(a);\n    BN_free(b);\n    BN_free(r);\n    BN_free(t);\n    return st;\n}', 'int BN_generate_prime_ex(BIGNUM *ret, int bits, int safe,\n                         const BIGNUM *add, const BIGNUM *rem, BN_GENCB *cb)\n{\n    BIGNUM *t;\n    int found = 0;\n    int i, j, c1 = 0;\n    BN_CTX *ctx = NULL;\n    prime_t *mods = NULL;\n    int checks = BN_prime_checks_for_size(bits);\n    if (bits < 2) {\n        BNerr(BN_F_BN_GENERATE_PRIME_EX, BN_R_BITS_TOO_SMALL);\n        return 0;\n    } else if (bits == 2 && safe) {\n        BNerr(BN_F_BN_GENERATE_PRIME_EX, BN_R_BITS_TOO_SMALL);\n        return 0;\n    }\n    mods = OPENSSL_zalloc(sizeof(*mods) * NUMPRIMES);\n    if (mods == NULL)\n        goto err;\n    ctx = BN_CTX_new();\n    if (ctx == NULL)\n        goto err;\n    BN_CTX_start(ctx);\n    t = BN_CTX_get(ctx);\n    if (t == NULL)\n        goto err;\n loop:\n    if (add == NULL) {\n        if (!probable_prime(ret, bits, mods))\n            goto err;\n    } else {\n        if (safe) {\n            if (!probable_prime_dh_safe(ret, bits, add, rem, ctx))\n                goto err;\n        } else {\n            if (!bn_probable_prime_dh(ret, bits, add, rem, ctx))\n                goto err;\n        }\n    }\n    if (!BN_GENCB_call(cb, 0, c1++))\n        goto err;\n    if (!safe) {\n        i = BN_is_prime_fasttest_ex(ret, checks, ctx, 0, cb);\n        if (i == -1)\n            goto err;\n        if (i == 0)\n            goto loop;\n    } else {\n        if (!BN_rshift1(t, ret))\n            goto err;\n        for (i = 0; i < checks; i++) {\n            j = BN_is_prime_fasttest_ex(ret, 1, ctx, 0, cb);\n            if (j == -1)\n                goto err;\n            if (j == 0)\n                goto loop;\n            j = BN_is_prime_fasttest_ex(t, 1, ctx, 0, cb);\n            if (j == -1)\n                goto err;\n            if (j == 0)\n                goto loop;\n            if (!BN_GENCB_call(cb, 2, c1 - 1))\n                goto err;\n        }\n    }\n    found = 1;\n err:\n    OPENSSL_free(mods);\n    if (ctx != NULL)\n        BN_CTX_end(ctx);\n    BN_CTX_free(ctx);\n    bn_check_top(ret);\n    return found;\n}', 'int BN_mod_exp_recp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,\n                    const BIGNUM *m, BN_CTX *ctx)\n{\n    int i, j, bits, ret = 0, wstart, wend, window, wvalue;\n    int start = 1;\n    BIGNUM *aa;\n    BIGNUM *val[TABLE_SIZE];\n    BN_RECP_CTX recp;\n    if (BN_get_flags(p, BN_FLG_CONSTTIME) != 0\n            || BN_get_flags(a, BN_FLG_CONSTTIME) != 0\n            || BN_get_flags(m, BN_FLG_CONSTTIME) != 0) {\n        BNerr(BN_F_BN_MOD_EXP_RECP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);\n        return 0;\n    }\n    bits = BN_num_bits(p);\n    if (bits == 0) {\n        if (BN_is_one(m)) {\n            ret = 1;\n            BN_zero(r);\n        } else {\n            ret = BN_one(r);\n        }\n        return ret;\n    }\n    BN_CTX_start(ctx);\n    aa = BN_CTX_get(ctx);\n    val[0] = BN_CTX_get(ctx);\n    if (val[0] == NULL)\n        goto err;\n    BN_RECP_CTX_init(&recp);\n    if (m->neg) {\n        if (!BN_copy(aa, m))\n            goto err;\n        aa->neg = 0;\n        if (BN_RECP_CTX_set(&recp, aa, ctx) <= 0)\n            goto err;\n    } else {\n        if (BN_RECP_CTX_set(&recp, m, ctx) <= 0)\n            goto err;\n    }\n    if (!BN_nnmod(val[0], a, m, ctx))\n        goto err;\n    if (BN_is_zero(val[0])) {\n        BN_zero(r);\n        ret = 1;\n        goto err;\n    }\n    window = BN_window_bits_for_exponent_size(bits);\n    if (window > 1) {\n        if (!BN_mod_mul_reciprocal(aa, val[0], val[0], &recp, ctx))\n            goto err;\n        j = 1 << (window - 1);\n        for (i = 1; i < j; i++) {\n            if (((val[i] = BN_CTX_get(ctx)) == NULL) ||\n                !BN_mod_mul_reciprocal(val[i], val[i - 1], aa, &recp, ctx))\n                goto err;\n        }\n    }\n    start = 1;\n    wvalue = 0;\n    wstart = bits - 1;\n    wend = 0;\n    if (!BN_one(r))\n        goto err;\n    for (;;) {\n        if (BN_is_bit_set(p, wstart) == 0) {\n            if (!start)\n                if (!BN_mod_mul_reciprocal(r, r, r, &recp, ctx))\n                    goto err;\n            if (wstart == 0)\n                break;\n            wstart--;\n            continue;\n        }\n        j = wstart;\n        wvalue = 1;\n        wend = 0;\n        for (i = 1; i < window; i++) {\n            if (wstart - i < 0)\n                break;\n            if (BN_is_bit_set(p, wstart - i)) {\n                wvalue <<= (i - wend);\n                wvalue |= 1;\n                wend = i;\n            }\n        }\n        j = wend + 1;\n        if (!start)\n            for (i = 0; i < j; i++) {\n                if (!BN_mod_mul_reciprocal(r, r, r, &recp, ctx))\n                    goto err;\n            }\n        if (!BN_mod_mul_reciprocal(r, r, val[wvalue >> 1], &recp, ctx))\n            goto err;\n        wstart -= wend + 1;\n        wvalue = 0;\n        start = 0;\n        if (wstart < 0)\n            break;\n    }\n    ret = 1;\n err:\n    BN_CTX_end(ctx);\n    BN_RECP_CTX_free(&recp);\n    bn_check_top(r);\n    return ret;\n}', 'BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b)\n{\n    bn_check_top(b);\n    if (a == b)\n        return a;\n    if (bn_wexpand(a, b->top) == NULL)\n        return NULL;\n    if (b->top > 0)\n        memcpy(a->d, b->d, sizeof(b->d[0]) * b->top);\n    a->top = b->top;\n    a->neg = b->neg;\n    bn_check_top(a);\n    return a;\n}', 'BIGNUM *bn_wexpand(BIGNUM *a, int words)\n{\n    return (words <= a->dmax) ? a : bn_expand2(a, words);\n}']