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annotate libtommath/bn_mp_mul_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_MUL_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 /* multiply by a digit */
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7 mp_err mp_mul_d(const mp_int *a, mp_digit b, mp_int *c)
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8 {
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9 mp_digit u, *tmpa, *tmpc;
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10 mp_word r;
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11 mp_err err;
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12 int ix, olduse;
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14 /* make sure c is big enough to hold a*b */
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15 if (c->alloc < (a->used + 1)) {
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16 if ((err = mp_grow(c, a->used + 1)) != MP_OKAY) {
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17 return err;
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18 }
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19 }
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21 /* get the original destinations used count */
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22 olduse = c->used;
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24 /* set the sign */
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25 c->sign = a->sign;
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27 /* alias for a->dp [source] */
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28 tmpa = a->dp;
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30 /* alias for c->dp [dest] */
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31 tmpc = c->dp;
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33 /* zero carry */
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34 u = 0;
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36 /* compute columns */
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37 for (ix = 0; ix < a->used; ix++) {
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38 /* compute product and carry sum for this term */
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39 r = (mp_word)u + ((mp_word)*tmpa++ * (mp_word)b);
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41 /* mask off higher bits to get a single digit */
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42 *tmpc++ = (mp_digit)(r & (mp_word)MP_MASK);
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44 /* send carry into next iteration */
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45 u = (mp_digit)(r >> (mp_word)MP_DIGIT_BIT);
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46 }
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48 /* store final carry [if any] and increment ix offset */
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49 *tmpc++ = u;
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50 ++ix;
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52 /* now zero digits above the top */
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53 MP_ZERO_DIGITS(tmpc, olduse - ix);
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55 /* set used count */
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56 c->used = a->used + 1;
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57 mp_clamp(c);
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59 return MP_OKAY;
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60 }
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61 #endif