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annotate libtommath/bn_mp_add_d.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_ADD_D_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 /* single digit addition */
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7 mp_err mp_add_d(const mp_int *a, mp_digit b, mp_int *c)
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8 {
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9 mp_err err;
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10 int ix, oldused;
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11 mp_digit *tmpa, *tmpc;
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13 /* grow c as required */
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14 if (c->alloc < (a->used + 1)) {
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15 if ((err = mp_grow(c, a->used + 1)) != MP_OKAY) {
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16 return err;
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17 }
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18 }
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20 /* if a is negative and |a| >= b, call c = |a| - b */
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21 if ((a->sign == MP_NEG) && ((a->used > 1) || (a->dp[0] >= b))) {
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22 mp_int a_ = *a;
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23 /* temporarily fix sign of a */
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24 a_.sign = MP_ZPOS;
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26 /* c = |a| - b */
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27 err = mp_sub_d(&a_, b, c);
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29 /* fix sign */
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30 c->sign = MP_NEG;
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32 /* clamp */
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33 mp_clamp(c);
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34
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35 return err;
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36 }
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38 /* old number of used digits in c */
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39 oldused = c->used;
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40
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41 /* source alias */
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42 tmpa = a->dp;
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44 /* destination alias */
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45 tmpc = c->dp;
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47 /* if a is positive */
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48 if (a->sign == MP_ZPOS) {
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49 /* add digits, mu is carry */
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50 mp_digit mu = b;
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51 for (ix = 0; ix < a->used; ix++) {
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52 *tmpc = *tmpa++ + mu;
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53 mu = *tmpc >> MP_DIGIT_BIT;
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54 *tmpc++ &= MP_MASK;
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55 }
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56 /* set final carry */
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57 ix++;
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58 *tmpc++ = mu;
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59
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60 /* setup size */
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61 c->used = a->used + 1;
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62 } else {
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63 /* a was negative and |a| < b */
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64 c->used = 1;
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65
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66 /* the result is a single digit */
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67 if (a->used == 1) {
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68 *tmpc++ = b - a->dp[0];
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69 } else {
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70 *tmpc++ = b;
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71 }
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73 /* setup count so the clearing of oldused
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74 * can fall through correctly
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75 */
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76 ix = 1;
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77 }
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79 /* sign always positive */
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80 c->sign = MP_ZPOS;
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81
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82 /* now zero to oldused */
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83 MP_ZERO_DIGITS(tmpc, oldused - ix);
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84 mp_clamp(c);
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85
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86 return MP_OKAY;
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87 }
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89 #endif