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Cherry-pick security-relevant fixes from upstream imath library.

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This covers alterations to buffer sizing and zeroing made between imath
1.3 and imath 1.20.  Valgrind Memcheck identified the buffer overruns
and reliance on uninitialized data; their exploit potential is unknown.
Builds specifying --with-openssl are unaffected, because they use the
OpenSSL BIGNUM facility instead of imath.  Back-patch to 9.0 (all
supported versions).

Security: CVE-2015-0243
This commit is contained in:
Noah Misch 2015-02-02 10:00:45 -05:00
parent d95ebe0ac3
commit d1972da8ce
1 changed files with 15 additions and 9 deletions
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24
contrib/pgcrypto/imath.c
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@ -818,7 +818,8 @@ mp_int_mul(mp_int a, mp_int b, mp_int c)
*/
ua = MP_USED(a);
ub = MP_USED(b);
osize = ua + ub;
osize = MAX(ua, ub);
osize = 4 * ((osize + 1) / 2);
if (c == a || c == b)
{
@ -907,7 +908,7 @@ mp_int_sqr(mp_int a, mp_int c)
CHECK(a != NULL && c != NULL);
/* Get a temporary buffer big enough to hold the result */
osize = (mp_size) 2 *MP_USED(a);
osize = (mp_size) 4 *((MP_USED(a) + 1) / 2);
if (a == c)
{
@ -2605,8 +2606,8 @@ s_kmul(mp_digit *da, mp_digit *db, mp_digit *dc,
* Now we'll get t1 = a0b0 and t2 = a1b1, and subtract them out so
* that we're left with only the pieces we want: t3 = a1b0 + a0b1
*/
ZERO(t1, bot_size + 1);
ZERO(t2, bot_size + 1);
ZERO(t1, buf_size);
ZERO(t2, buf_size);
(void) s_kmul(da, db, t1, bot_size, bot_size); /* t1 = a0 * b0 */
(void) s_kmul(a_top, b_top, t2, at_size, bt_size); /* t2 = a1 * b1 */
@ -2616,11 +2617,13 @@ s_kmul(mp_digit *da, mp_digit *db, mp_digit *dc,
/* Assemble the output value */
COPY(t1, dc, buf_size);
(void) s_uadd(t3, dc + bot_size, dc + bot_size,
buf_size + 1, buf_size + 1);
carry = s_uadd(t3, dc + bot_size, dc + bot_size,
buf_size + 1, buf_size);
assert(carry == 0);
(void) s_uadd(t2, dc + 2 * bot_size, dc + 2 * bot_size,
buf_size, buf_size);
carry = s_uadd(t2, dc + 2 * bot_size, dc + 2 * bot_size,
buf_size, buf_size);
assert(carry == 0);
s_free(t1); /* note t2 and t3 are just internal pointers
* to t1 */
@ -3307,7 +3310,10 @@ s_embar(mp_int a, mp_int b, mp_int m, mp_int mu, mp_int c)
dbt = db + MP_USED(b) - 1;
while (last < 3)
SETUP(mp_int_init_size(TEMP(last), 2 * umu), last);
{
SETUP(mp_int_init_size(TEMP(last), 4 * umu), last);
ZERO(MP_DIGITS(TEMP(last - 1)), MP_ALLOC(TEMP(last - 1)));
}
(void) mp_int_set_value(c, 1);