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annotate libtommath/bn_mp_mul_2.c @ 1930:299f4f19ba19

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Add /usr/sbin and /sbin to default root PATH When dropbear is used in a very restricted environment (such as in a initrd), the default user shell is often also very restricted and doesn't take care of setting the PATH so the user ends up with the PATH set by dropbear. Unfortunately, dropbear always sets "/usr/bin:/bin" as default PATH even for the root user which should have /usr/sbin and /sbin too. For a concrete instance of this problem, see the "Remote Unlocking" section in this tutorial: https://paxswill.com/blog/2013/11/04/encrypted-raspberry-pi/ It speaks of a bug in the initramfs script because it's written "blkid" instead of "/sbin/blkid"... this is just because the scripts from the initramfs do not expect to have a PATH without the sbin directories and because dropbear is not setting the PATH appropriately for the root user. I'm thus suggesting to use the attached patch to fix this misbehaviour (I did not test it, but it's easy enough). It might seem anecdotic but multiple Kali users have been bitten by this. From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903403
author Raphael Hertzog <hertzog@debian.org>
date Mon, 09 Jul 2018 16:27:53 +0200
parents 1051e4eea25a
children
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_MUL_2_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 /* b = a*2 */
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7 mp_err mp_mul_2(const mp_int *a, mp_int *b)
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8 {
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9 int x, oldused;
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10 mp_err err;
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11
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12 /* grow to accomodate result */
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13 if (b->alloc < (a->used + 1)) {
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14 if ((err = mp_grow(b, a->used + 1)) != MP_OKAY) {
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15 return err;
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16 }
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17 }
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19 oldused = b->used;
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20 b->used = a->used;
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22 {
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23 mp_digit r, rr, *tmpa, *tmpb;
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25 /* alias for source */
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26 tmpa = a->dp;
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27
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28 /* alias for dest */
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29 tmpb = b->dp;
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31 /* carry */
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32 r = 0;
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33 for (x = 0; x < a->used; x++) {
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35 /* get what will be the *next* carry bit from the
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36 * MSB of the current digit
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37 */
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38 rr = *tmpa >> (mp_digit)(MP_DIGIT_BIT - 1);
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39
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40 /* now shift up this digit, add in the carry [from the previous] */
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41 *tmpb++ = ((*tmpa++ << 1uL) | r) & MP_MASK;
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42
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43 /* copy the carry that would be from the source
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44 * digit into the next iteration
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45 */
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46 r = rr;
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47 }
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49 /* new leading digit? */
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50 if (r != 0u) {
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51 /* add a MSB which is always 1 at this point */
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52 *tmpb = 1;
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53 ++(b->used);
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54 }
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55
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56 /* now zero any excess digits on the destination
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57 * that we didn't write to
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58 */
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59 MP_ZERO_DIGITS(b->dp + b->used, oldused - b->used);
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60 }
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61 b->sign = a->sign;
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62 return MP_OKAY;
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63 }
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64 #endif