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annotate libtommath/bn_s_mp_add.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "tommath_private.h"
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2 #ifdef BN_S_MP_ADD_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 /* low level addition, based on HAC pp.594, Algorithm 14.7 */
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7 mp_err s_mp_add(const mp_int *a, const mp_int *b, mp_int *c)
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8 {
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9 const mp_int *x;
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10 mp_err err;
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11 int olduse, min, max;
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13 /* find sizes, we let |a| <= |b| which means we have to sort
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14 * them. "x" will point to the input with the most digits
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15 */
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16 if (a->used > b->used) {
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17 min = b->used;
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18 max = a->used;
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19 x = a;
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20 } else {
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21 min = a->used;
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22 max = b->used;
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23 x = b;
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24 }
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26 /* init result */
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27 if (c->alloc < (max + 1)) {
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28 if ((err = mp_grow(c, max + 1)) != MP_OKAY) {
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29 return err;
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30 }
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31 }
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33 /* get old used digit count and set new one */
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34 olduse = c->used;
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35 c->used = max + 1;
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37 {
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38 mp_digit u, *tmpa, *tmpb, *tmpc;
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39 int i;
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41 /* alias for digit pointers */
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43 /* first input */
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44 tmpa = a->dp;
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46 /* second input */
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47 tmpb = b->dp;
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49 /* destination */
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50 tmpc = c->dp;
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52 /* zero the carry */
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53 u = 0;
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54 for (i = 0; i < min; i++) {
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55 /* Compute the sum at one digit, T[i] = A[i] + B[i] + U */
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56 *tmpc = *tmpa++ + *tmpb++ + u;
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58 /* U = carry bit of T[i] */
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59 u = *tmpc >> (mp_digit)MP_DIGIT_BIT;
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61 /* take away carry bit from T[i] */
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62 *tmpc++ &= MP_MASK;
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63 }
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64
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65 /* now copy higher words if any, that is in A+B
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66 * if A or B has more digits add those in
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67 */
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68 if (min != max) {
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69 for (; i < max; i++) {
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70 /* T[i] = X[i] + U */
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71 *tmpc = x->dp[i] + u;
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73 /* U = carry bit of T[i] */
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74 u = *tmpc >> (mp_digit)MP_DIGIT_BIT;
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76 /* take away carry bit from T[i] */
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77 *tmpc++ &= MP_MASK;
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78 }
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79 }
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81 /* add carry */
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82 *tmpc++ = u;
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83
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84 /* clear digits above oldused */
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85 MP_ZERO_DIGITS(tmpc, olduse - c->used);
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86 }
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87
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88 mp_clamp(c);
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89 return MP_OKAY;
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90 }
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91 #endif