test/bntest.c:1198: error: BUFFER_OVERRUN_L3
  Offset added: [8, +oo] Size: [0, 67108856] by call to `BN_sqr`.
Showing all 29 steps of the trace


test/bntest.c:1184:17: Call
1182.   static int file_square(STANZA *s)
1183.   {
1184.       BIGNUM *a = getBN(s, "A");
                        ^
1185.       BIGNUM *square = getBN(s, "Square");
1186.       BIGNUM *zero = BN_new();

test/bntest.c:115:9: Call
  113.       }
  114.   
  115.       if (parseBN(&ret, hex) != (int)strlen(hex)) {
                 ^
  116.           fprintf(stderr, "Could not decode '%s'.\n", hex);
  117.           return NULL;

test/bntest.c:95:12: Call
    93.   {
    94.       *out = NULL;
    95.       return BN_hex2bn(out, in);
                     ^
    96.   }
    97.   

crypto/bn/bn_print.c:166:5: Assignment
      164.       j = i;                      /* least significant 'hex' */
      165.       m = 0;
      166.       h = 0;
                 ^
      167.       while (j > 0) {
      168.           m = ((BN_BYTES * 2) <= j) ? (BN_BYTES * 2) : j;

crypto/bn/bn_print.c:184:5: Assignment
      182.           j -= (BN_BYTES * 2);
      183.       }
      184.       ret->top = h;
                 ^
      185.       bn_correct_top(ret);
      186.   

test/bntest.c:1198:10: Call
1196.       BN_zero(zero);
1197.   
1198.       if (!BN_sqr(ret, a, ctx)
                 ^
1199.               || !equalBN("A^2", square, ret)
1200.               || !BN_mul(ret, a, a, ctx)

crypto/bn/bn_sqr.c:17:1: Parameter `a->top`
  15.    * I've just gone over this and it is now %20 faster on x86 - eay - 27 Jun 96
  16.    */
  17. > int BN_sqr(BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
  18.   {
  19.       int max, al;

crypto/bn/bn_sqr.c:25:5: Assignment
  23.       bn_check_top(a);
  24.   
  25.       al = a->top;
            ^
  26.       if (al <= 0) {
  27.           r->top = 0;

crypto/bn/bn_sqr.c:38:5: Assignment
  36.           goto err;
  37.   
  38.       max = 2 * al;               /* Non-zero (from above) */
            ^
  39.       if (bn_wexpand(rr, max) == NULL)
  40.           goto err;

crypto/bn/bn_sqr.c:90:9: Assignment
  88.        */
  89.       if (a->d[al - 1] == (a->d[al - 1] & BN_MASK2l))
  90.           rr->top = max - 1;
                ^
  91.       else
  92.           rr->top = max;

crypto/bn/bn_sqr.c:93:20: Call
  91.       else
  92.           rr->top = max;
  93.       if (r != rr && BN_copy(r, rr) == NULL)
                           ^
  94.           goto err;
  95.   

crypto/bn/bn_lib.c:322:1: Parameter `a->top`
    320.   }
    321.   
    322. > BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b)
    323.   {
    324.       bn_check_top(b);

crypto/bn/bn_lib.c:328:9: Call
    326.       if (a == b)
    327.           return a;
    328.       if (bn_wexpand(a, b->top) == NULL)
                   ^
    329.           return NULL;
    330.   

crypto/bn/bn_lib.c:946:1: Parameter `a->top`
      944.   }
      945.   
      946. > BIGNUM *bn_wexpand(BIGNUM *a, int words)
      947.   {
      948.       return (words <= a->dmax) ? a : bn_expand2(a, words);

crypto/bn/bn_lib.c:948:37: Call
      946.   BIGNUM *bn_wexpand(BIGNUM *a, int words)
      947.   {
      948.       return (words <= a->dmax) ? a : bn_expand2(a, words);
                                                 ^
      949.   }
      950.   

crypto/bn/bn_lib.c:283:1: Parameter `b->top`
        281.    */
        282.   
        283. > BIGNUM *bn_expand2(BIGNUM *b, int words)
        284.   {
        285.       bn_check_top(b);

crypto/bn/bn_lib.c:288:23: Call
        286.   
        287.       if (words > b->dmax) {
        288.           BN_ULONG *a = bn_expand_internal(b, words);
                                     ^
        289.           if (!a)
        290.               return NULL;

crypto/bn/bn_lib.c:246:1: <Offset trace>
244.   /* This is used by bn_expand2() */
245.   /* The caller MUST check that words > b->dmax before calling this */
246. > static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)
247.   {
248.       BN_ULONG *a = NULL;

crypto/bn/bn_lib.c:246:1: Parameter `b->top`
          244.   /* This is used by bn_expand2() */
          245.   /* The caller MUST check that words > b->dmax before calling this */
          246. > static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)
          247.   {
          248.       BN_ULONG *a = NULL;

crypto/bn/bn_lib.c:246:1: <Length trace>
244.   /* This is used by bn_expand2() */
245.   /* The caller MUST check that words > b->dmax before calling this */
246. > static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)
247.   {
248.       BN_ULONG *a = NULL;

crypto/bn/bn_lib.c:246:1: Parameter `words`
          244.   /* This is used by bn_expand2() */
          245.   /* The caller MUST check that words > b->dmax before calling this */
          246. > static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)
          247.   {
          248.       BN_ULONG *a = NULL;

crypto/bn/bn_lib.c:263:13: Call
          261.           a = OPENSSL_secure_zalloc(words * sizeof(*a));
          262.       else
          263.           a = OPENSSL_zalloc(words * sizeof(*a));
                             ^
          264.       if (a == NULL) {
          265.           BNerr(BN_F_BN_EXPAND_INTERNAL, ERR_R_MALLOC_FAILURE);

crypto/mem.c:186:1: Parameter `num`
            184.   }
            185.   
            186. > void *CRYPTO_zalloc(size_t num, const char *file, int line)
            187.   {
            188.       void *ret = CRYPTO_malloc(num, file, line);

crypto/mem.c:188:17: Call
            186.   void *CRYPTO_zalloc(size_t num, const char *file, int line)
            187.   {
            188.       void *ret = CRYPTO_malloc(num, file, line);
                                   ^
            189.   
            190.       FAILTEST();

crypto/mem.c:166:9: Assignment
              164.   
              165.       if (num == 0)
              166.           return NULL;
                             ^
              167.   
              168.       FAILTEST();

crypto/mem.c:188:5: Assignment
            186.   void *CRYPTO_zalloc(size_t num, const char *file, int line)
            187.   {
            188.       void *ret = CRYPTO_malloc(num, file, line);
                       ^
            189.   
            190.       FAILTEST();

crypto/mem.c:193:5: Assignment
            191.       if (ret != NULL)
            192.           memset(ret, 0, num);
            193.       return ret;
                       ^
            194.   }
            195.   

crypto/bn/bn_lib.c:263:9: Assignment
          261.           a = OPENSSL_secure_zalloc(words * sizeof(*a));
          262.       else
          263.           a = OPENSSL_zalloc(words * sizeof(*a));
                         ^
          264.       if (a == NULL) {
          265.           BNerr(BN_F_BN_EXPAND_INTERNAL, ERR_R_MALLOC_FAILURE);

crypto/bn/bn_lib.c:270:5: Array access: Offset added: [8, +oo] Size: [0, 67108856] by call to `BN_sqr` 
          268.   
          269.       assert(b->top <= words);
          270.       memcpy(a, b->d, sizeof(*a) * b->top);
                     ^
          271.   
          272.       return a;

static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)
{
    BN_ULONG *a = NULL;
    bn_check_top(b);
    if (words > (INT_MAX / (4 * BN_BITS2))) {
        BNerr(BN_F_BN_EXPAND_INTERNAL, BN_R_BIGNUM_TOO_LONG);
        return NULL;
    }
    if (BN_get_flags(b, BN_FLG_STATIC_DATA)) {
        BNerr(BN_F_BN_EXPAND_INTERNAL, BN_R_EXPAND_ON_STATIC_BIGNUM_DATA);
        return (NULL);
    }
    if (BN_get_flags(b, BN_FLG_SECURE))
        a = OPENSSL_secure_zalloc(words * sizeof(*a));
    else
        a = OPENSSL_zalloc(words * sizeof(*a));
    if (a == NULL) {
        BNerr(BN_F_BN_EXPAND_INTERNAL, ERR_R_MALLOC_FAILURE);
        return (NULL);
    }
    assert(b->top <= words);
    memcpy(a, b->d, sizeof(*a) * b->top);
    return a;
}
['static int file_square(STANZA *s)\n{\n    BIGNUM *a = getBN(s, "A");\n    BIGNUM *square = getBN(s, "Square");\n    BIGNUM *zero = BN_new();\n    BIGNUM *ret = BN_new();\n    BIGNUM *remainder = BN_new();\n    BIGNUM *tmp = NULL;\n    int st = 0;\n    if (a == NULL || square == NULL || zero == NULL || ret == NULL\n            || remainder == NULL)\n        goto err;\n    BN_zero(zero);\n    if (!BN_sqr(ret, a, ctx)\n            || !equalBN("A^2", square, ret)\n            || !BN_mul(ret, a, a, ctx)\n            || !equalBN("A * A", square, ret)\n            || !BN_div(ret, remainder, square, a, ctx)\n            || !equalBN("Square / A", a, ret)\n            || !equalBN("Square % A", zero, remainder))\n        goto err;\n#if HAVE_BN_SQRT\n    BN_set_negative(a, 0);\n    if (!BN_sqrt(ret, square, ctx)\n            || !equalBN("sqrt(Square)", a, ret))\n        goto err;\n    if (!BN_is_zero(square)) {\n        tmp = BN_new();\n        if (tmp == NULL || !BN_copy(tmp, square))\n            goto err;\n        BN_set_negative(tmp, 1);\n        if (BN_sqrt(ret, tmp, ctx)) {\n            fprintf(stderr, "BN_sqrt succeeded on a negative number");\n            goto err;\n        }\n        ERR_clear_error();\n        BN_set_negative(tmp, 0);\n        if (BN_add(tmp, tmp, BN_value_one()))\n            goto err;\n        if (BN_sqrt(ret, tmp, ctx)) {\n            fprintf(stderr, "BN_sqrt succeeded on a non-square");\n            goto err;\n        }\n        ERR_clear_error();\n    }\n#endif\n    st = 1;\nerr:\n    BN_free(a);\n    BN_free(square);\n    BN_free(zero);\n    BN_free(ret);\n    BN_free(remainder);\n    BN_free(tmp);\n    return st;\n}', 'static BIGNUM *getBN(STANZA *s, const char *attribute)\n{\n    const char *hex;\n    BIGNUM *ret = NULL;\n    if ((hex = findattr(s, attribute)) == NULL) {\n        fprintf(stderr, "Can\'t find %s in test at line %d\\n",\n                attribute, s->start);\n        return NULL;\n    }\n    if (parseBN(&ret, hex) != (int)strlen(hex)) {\n        fprintf(stderr, "Could not decode \'%s\'.\\n", hex);\n        return NULL;\n    }\n    return ret;\n}', 'static int parseBN(BIGNUM **out, const char *in)\n{\n    *out = NULL;\n    return BN_hex2bn(out, in);\n}', "int BN_hex2bn(BIGNUM **bn, const char *a)\n{\n    BIGNUM *ret = NULL;\n    BN_ULONG l = 0;\n    int neg = 0, h, m, i, j, k, c;\n    int num;\n    if ((a == NULL) || (*a == '\\0'))\n        return (0);\n    if (*a == '-') {\n        neg = 1;\n        a++;\n    }\n    for (i = 0; i <= (INT_MAX/4) && isxdigit((unsigned char)a[i]); i++)\n        continue;\n    if (i == 0 || i > INT_MAX/4)\n        goto err;\n    num = i + neg;\n    if (bn == NULL)\n        return (num);\n    if (*bn == NULL) {\n        if ((ret = BN_new()) == NULL)\n            return (0);\n    } else {\n        ret = *bn;\n        BN_zero(ret);\n    }\n    if (bn_expand(ret, i * 4) == NULL)\n        goto err;\n    j = i;\n    m = 0;\n    h = 0;\n    while (j > 0) {\n        m = ((BN_BYTES * 2) <= j) ? (BN_BYTES * 2) : j;\n        l = 0;\n        for (;;) {\n            c = a[j - m];\n            k = OPENSSL_hexchar2int(c);\n            if (k < 0)\n                k = 0;\n            l = (l << 4) | k;\n            if (--m <= 0) {\n                ret->d[h++] = l;\n                break;\n            }\n        }\n        j -= (BN_BYTES * 2);\n    }\n    ret->top = h;\n    bn_correct_top(ret);\n    *bn = ret;\n    bn_check_top(ret);\n    if (ret->top != 0)\n        ret->neg = neg;\n    return (num);\n err:\n    if (*bn == NULL)\n        BN_free(ret);\n    return (0);\n}", 'int BN_sqr(BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)\n{\n    int max, al;\n    int ret = 0;\n    BIGNUM *tmp, *rr;\n    bn_check_top(a);\n    al = a->top;\n    if (al <= 0) {\n        r->top = 0;\n        r->neg = 0;\n        return 1;\n    }\n    BN_CTX_start(ctx);\n    rr = (a != r) ? r : BN_CTX_get(ctx);\n    tmp = BN_CTX_get(ctx);\n    if (!rr || !tmp)\n        goto err;\n    max = 2 * al;\n    if (bn_wexpand(rr, max) == NULL)\n        goto err;\n    if (al == 4) {\n#ifndef BN_SQR_COMBA\n        BN_ULONG t[8];\n        bn_sqr_normal(rr->d, a->d, 4, t);\n#else\n        bn_sqr_comba4(rr->d, a->d);\n#endif\n    } else if (al == 8) {\n#ifndef BN_SQR_COMBA\n        BN_ULONG t[16];\n        bn_sqr_normal(rr->d, a->d, 8, t);\n#else\n        bn_sqr_comba8(rr->d, a->d);\n#endif\n    } else {\n#if defined(BN_RECURSION)\n        if (al < BN_SQR_RECURSIVE_SIZE_NORMAL) {\n            BN_ULONG t[BN_SQR_RECURSIVE_SIZE_NORMAL * 2];\n            bn_sqr_normal(rr->d, a->d, al, t);\n        } else {\n            int j, k;\n            j = BN_num_bits_word((BN_ULONG)al);\n            j = 1 << (j - 1);\n            k = j + j;\n            if (al == j) {\n                if (bn_wexpand(tmp, k * 2) == NULL)\n                    goto err;\n                bn_sqr_recursive(rr->d, a->d, al, tmp->d);\n            } else {\n                if (bn_wexpand(tmp, max) == NULL)\n                    goto err;\n                bn_sqr_normal(rr->d, a->d, al, tmp->d);\n            }\n        }\n#else\n        if (bn_wexpand(tmp, max) == NULL)\n            goto err;\n        bn_sqr_normal(rr->d, a->d, al, tmp->d);\n#endif\n    }\n    rr->neg = 0;\n    if (a->d[al - 1] == (a->d[al - 1] & BN_MASK2l))\n        rr->top = max - 1;\n    else\n        rr->top = max;\n    if (r != rr && BN_copy(r, rr) == NULL)\n        goto err;\n    ret = 1;\n err:\n    bn_check_top(rr);\n    bn_check_top(tmp);\n    BN_CTX_end(ctx);\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    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}', 'BIGNUM *bn_expand2(BIGNUM *b, int words)\n{\n    bn_check_top(b);\n    if (words > b->dmax) {\n        BN_ULONG *a = bn_expand_internal(b, words);\n        if (!a)\n            return NULL;\n        if (b->d) {\n            OPENSSL_cleanse(b->d, b->dmax * sizeof(b->d[0]));\n            bn_free_d(b);\n        }\n        b->d = a;\n        b->dmax = words;\n    }\n    bn_check_top(b);\n    return b;\n}', 'static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words)\n{\n    BN_ULONG *a = NULL;\n    bn_check_top(b);\n    if (words > (INT_MAX / (4 * BN_BITS2))) {\n        BNerr(BN_F_BN_EXPAND_INTERNAL, BN_R_BIGNUM_TOO_LONG);\n        return NULL;\n    }\n    if (BN_get_flags(b, BN_FLG_STATIC_DATA)) {\n        BNerr(BN_F_BN_EXPAND_INTERNAL, BN_R_EXPAND_ON_STATIC_BIGNUM_DATA);\n        return (NULL);\n    }\n    if (BN_get_flags(b, BN_FLG_SECURE))\n        a = OPENSSL_secure_zalloc(words * sizeof(*a));\n    else\n        a = OPENSSL_zalloc(words * sizeof(*a));\n    if (a == NULL) {\n        BNerr(BN_F_BN_EXPAND_INTERNAL, ERR_R_MALLOC_FAILURE);\n        return (NULL);\n    }\n    assert(b->top <= words);\n    memcpy(a, b->d, sizeof(*a) * b->top);\n    return a;\n}', 'void *CRYPTO_zalloc(size_t num, const char *file, int line)\n{\n    void *ret = CRYPTO_malloc(num, file, line);\n    FAILTEST();\n    if (ret != NULL)\n        memset(ret, 0, num);\n    return ret;\n}', 'void *CRYPTO_malloc(size_t num, const char *file, int line)\n{\n    void *ret = NULL;\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    allow_customize = 0;\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    osslargused(file); osslargused(line);\n    ret = malloc(num);\n#endif\n    return ret;\n}']