Mercurial > dropbear

annotate libtommath/bn_mp_grow.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 1051e4eea25a
children
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
1 #include "tommath_private.h"
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2 #ifdef BN_MP_GROW_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
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4 /* SPDX-License-Identifier: Unlicense */
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6 /* grow as required */
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7 mp_err mp_grow(mp_int *a, int size)
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8 {
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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9 int i;
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parents: 1470
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10 mp_digit *tmp;
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11
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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12 /* if the alloc size is smaller alloc more ram */
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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13 if (a->alloc < size) {
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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14 /* reallocate the array a->dp
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parents: 1470
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15 *
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parents: 1470
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16 * We store the return in a temporary variable
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parents: 1470
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17 * in case the operation failed we don't want
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parents: 1470
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18 * to overwrite the dp member of a.
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parents: 1470
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19 */
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20 tmp = (mp_digit *) MP_REALLOC(a->dp,
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21 (size_t)a->alloc * sizeof(mp_digit),
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22 (size_t)size * sizeof(mp_digit));
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parents: 1470
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23 if (tmp == NULL) {
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parents: 1470
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24 /* reallocation failed but "a" is still valid [can be freed] */
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25 return MP_MEM;
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parents: 1470
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26 }
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parents: 1470
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28 /* reallocation succeeded so set a->dp */
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parents: 1470
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29 a->dp = tmp;
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parents: 1470
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31 /* zero excess digits */
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parents: 1470
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32 i = a->alloc;
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parents: 1470
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33 a->alloc = size;
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34 MP_ZERO_DIGITS(a->dp + i, a->alloc - i);
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parents: 1470
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35 }
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parents: 1470
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36 return MP_OKAY;
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37 }
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38 #endif