crypto/rsa/rsa_x931g.c:158: error: BUFFER_OVERRUN_L3
  Offset added: [8, +oo] Size: [0, 536870848] by call to `BN_X931_generate_Xpq`.
Showing all 22 steps of the trace


crypto/rsa/rsa_x931g.c:154:10: Call
152.   
153.       BN_CTX_start(ctx);
154.       Xp = BN_CTX_get(ctx);
                ^
155.       Xq = BN_CTX_get(ctx);
156.       if (Xq == NULL)

crypto/bn/bn_ctx.c:229:5: Call
  227.       }
  228.       /* OK, make sure the returned bignum is "zero" */
  229.       BN_zero(ret);
             ^
  230.       ctx->used++;
  231.       CTXDBG_RET(ctx, ret);

crypto/bn/bn_lib.c:402:15: Assignment
    400.       a->neg = 0;
    401.       a->d[0] = w;
    402.       a->top = (w ? 1 : 0);
                         ^
    403.       bn_check_top(a);
    404.       return (1);

crypto/bn/bn_lib.c:402:5: Assignment
    400.       a->neg = 0;
    401.       a->d[0] = w;
    402.       a->top = (w ? 1 : 0);
               ^
    403.       bn_check_top(a);
    404.       return (1);

crypto/rsa/rsa_x931g.c:158:10: Call
156.       if (Xq == NULL)
157.           goto error;
158.       if (!BN_X931_generate_Xpq(Xp, Xq, bits, ctx))
                ^
159.           goto error;
160.   

crypto/bn/bn_x931p.c:160:1: Parameter `*Xp->d`
  158.    */
  159.   
  160. > int BN_X931_generate_Xpq(BIGNUM *Xp, BIGNUM *Xq, int nbits, BN_CTX *ctx)
  161.   {
  162.       BIGNUM *t;

crypto/bn/bn_x931p.c:176:10: Call
  174.        * exceeded.
  175.        */
  176.       if (!BN_rand(Xp, nbits, BN_RAND_TOP_TWO, BN_RAND_BOTTOM_ANY))
                  ^
  177.           goto err;
  178.   

crypto/bn/bn_rand.c:96:1: Parameter `*rnd->d`
    94.   }
    95.   
    96. > int BN_rand(BIGNUM *rnd, int bits, int top, int bottom)
    97.   {
    98.       return bnrand(0, rnd, bits, top, bottom);

crypto/bn/bn_rand.c:98:12: Call
    96.   int BN_rand(BIGNUM *rnd, int bits, int top, int bottom)
    97.   {
    98.       return bnrand(0, rnd, bits, top, bottom);
                      ^
    99.   }
    100.   

crypto/bn/bn_rand.c:17:1: Parameter `*rnd->d`
      15.   #include <openssl/sha.h>
      16.   
      17. > static int bnrand(int pseudorand, BIGNUM *rnd, int bits, int top, int bottom)
      18.   {
      19.       unsigned char *buf = NULL;

crypto/bn/bn_rand.c:26:9: Call
      24.           if (top != BN_RAND_TOP_ANY || bottom != BN_RAND_BOTTOM_ANY)
      25.               goto toosmall;
      26.           BN_zero(rnd);
                    ^
      27.           return 1;
      28.       }

crypto/bn/bn_lib.c:395:1: Parameter `*a->d`
        393.   }
        394.   
        395. > int BN_set_word(BIGNUM *a, BN_ULONG w)
        396.   {
        397.       bn_check_top(a);

crypto/bn/bn_lib.c:398:9: Call
        396.   {
        397.       bn_check_top(a);
        398.       if (bn_expand(a, (int)sizeof(BN_ULONG) * 8) == NULL)
                       ^
        399.           return (0);
        400.       a->neg = 0;

crypto/bn/bn_lcl.h:660:1: Parameter `*a->d`
          658.                            const BIGNUM *add, const BIGNUM *rem, BN_CTX *ctx);
          659.   
          660. > static ossl_inline BIGNUM *bn_expand(BIGNUM *a, int bits)
          661.   {
          662.       if (bits > (INT_MAX - BN_BITS2 + 1))

crypto/bn/bn_lcl.h:668:12: Call
          666.           return a;
          667.   
          668.       return bn_expand2((a),(bits+BN_BITS2-1)/BN_BITS2);
                            ^
          669.   }
          670.   

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

crypto/bn/bn_lib.c:289:23: Call
            287.   
            288.       if (words > b->dmax) {
            289.           BN_ULONG *a = bn_expand_internal(b, words);
                                         ^
            290.           if (!a)
            291.               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 `*b->d`
              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:271:9: Array access: Offset added: [8, +oo] Size: [0, 536870848] by call to `BN_X931_generate_Xpq` 
              269.       assert(b->top <= words);
              270.       if (b->top > 0)
              271.           memcpy(a, b->d, sizeof(*a) * b->top);
                             ^
              272.   
              273.       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);
    if (b->top > 0)
        memcpy(a, b->d, sizeof(*a) * b->top);
    return a;
}
['int RSA_X931_generate_key_ex(RSA *rsa, int bits, const BIGNUM *e,\n                             BN_GENCB *cb)\n{\n    int ok = 0;\n    BIGNUM *Xp = NULL, *Xq = NULL;\n    BN_CTX *ctx = NULL;\n    ctx = BN_CTX_new();\n    if (ctx == NULL)\n        goto error;\n    BN_CTX_start(ctx);\n    Xp = BN_CTX_get(ctx);\n    Xq = BN_CTX_get(ctx);\n    if (Xq == NULL)\n        goto error;\n    if (!BN_X931_generate_Xpq(Xp, Xq, bits, ctx))\n        goto error;\n    rsa->p = BN_new();\n    rsa->q = BN_new();\n    if (rsa->p == NULL || rsa->q == NULL)\n        goto error;\n    if (!BN_X931_generate_prime_ex(rsa->p, NULL, NULL, NULL, NULL, Xp,\n                                   e, ctx, cb))\n        goto error;\n    if (!BN_X931_generate_prime_ex(rsa->q, NULL, NULL, NULL, NULL, Xq,\n                                   e, ctx, cb))\n        goto error;\n    if (!RSA_X931_derive_ex(rsa, NULL, NULL, NULL, NULL,\n                            NULL, NULL, NULL, NULL, NULL, NULL, e, cb))\n        goto error;\n    ok = 1;\n error:\n    if (ctx)\n        BN_CTX_end(ctx);\n    BN_CTX_free(ctx);\n    if (ok)\n        return 1;\n    return 0;\n}', 'BIGNUM *BN_CTX_get(BN_CTX *ctx)\n{\n    BIGNUM *ret;\n    CTXDBG_ENTRY("BN_CTX_get", ctx);\n    if (ctx->err_stack || ctx->too_many)\n        return NULL;\n    if ((ret = BN_POOL_get(&ctx->pool, ctx->flags)) == NULL) {\n        ctx->too_many = 1;\n        BNerr(BN_F_BN_CTX_GET, BN_R_TOO_MANY_TEMPORARY_VARIABLES);\n        return NULL;\n    }\n    BN_zero(ret);\n    ctx->used++;\n    CTXDBG_RET(ctx, ret);\n    return ret;\n}', 'int BN_set_word(BIGNUM *a, BN_ULONG w)\n{\n    bn_check_top(a);\n    if (bn_expand(a, (int)sizeof(BN_ULONG) * 8) == NULL)\n        return (0);\n    a->neg = 0;\n    a->d[0] = w;\n    a->top = (w ? 1 : 0);\n    bn_check_top(a);\n    return (1);\n}', 'int BN_X931_generate_Xpq(BIGNUM *Xp, BIGNUM *Xq, int nbits, BN_CTX *ctx)\n{\n    BIGNUM *t;\n    int i;\n    if ((nbits < 1024) || (nbits & 0xff))\n        return 0;\n    nbits >>= 1;\n    if (!BN_rand(Xp, nbits, BN_RAND_TOP_TWO, BN_RAND_BOTTOM_ANY))\n        goto err;\n    BN_CTX_start(ctx);\n    t = BN_CTX_get(ctx);\n    if (t == NULL)\n        goto err;\n    for (i = 0; i < 1000; i++) {\n        if (!BN_rand(Xq, nbits, BN_RAND_TOP_TWO, BN_RAND_BOTTOM_ANY))\n            goto err;\n        BN_sub(t, Xp, Xq);\n        if (BN_num_bits(t) > (nbits - 100))\n            break;\n    }\n    BN_CTX_end(ctx);\n    if (i < 1000)\n        return 1;\n    return 0;\n err:\n    BN_CTX_end(ctx);\n    return 0;\n}', 'int BN_rand(BIGNUM *rnd, int bits, int top, int bottom)\n{\n    return bnrand(0, rnd, bits, top, bottom);\n}', 'static int bnrand(int pseudorand, BIGNUM *rnd, int bits, int top, int bottom)\n{\n    unsigned char *buf = NULL;\n    int ret = 0, bit, bytes, mask;\n    time_t tim;\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    time(&tim);\n    RAND_add(&tim, sizeof(tim), 0.0);\n    if (RAND_bytes(buf, bytes) <= 0)\n        goto err;\n    if (pseudorand == 2) {\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}', 'static ossl_inline BIGNUM *bn_expand(BIGNUM *a, int bits)\n{\n    if (bits > (INT_MAX - BN_BITS2 + 1))\n        return NULL;\n    if (((bits+BN_BITS2-1)/BN_BITS2) <= (a)->dmax)\n        return a;\n    return bn_expand2((a),(bits+BN_BITS2-1)/BN_BITS2);\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    if (b->top > 0)\n        memcpy(a, b->d, sizeof(*a) * b->top);\n    return a;\n}']