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Cast our weights down to ints from int64.

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They are capped to be between 0 and weight_scale (10000) by the code
just before the snprintf.
This commit is contained in:
Mike Perry 2010-02-25 11:42:45 -08:00
parent 00f9a35678
commit 50d6960332
1 changed files with 15 additions and 12 deletions
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27
src/or/dirvote.c
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@ -923,6 +923,11 @@ networkstatus_compute_bw_weights_v9(smartlist_t *chunks, int64_t G, int64_t M,
}
}
/* We cast down the weights to 32 bit ints on the assumption that
* weight_scale is ~= 10000. We need to ensure a rogue authority
* doesn't break this assumption to rig our weights */
tor_assert(0 < weight_scale && weight_scale < INT32_MAX);
if (Wgg < 0 || Wgg > weight_scale) {
log_warn(LD_DIR, "Bw %s: Wgg="I64_FORMAT"! G="I64_FORMAT
" M="I64_FORMAT" E="I64_FORMAT" D="I64_FORMAT
@ -984,18 +989,16 @@ networkstatus_compute_bw_weights_v9(smartlist_t *chunks, int64_t G, int64_t M,
* NOTE: This list is sorted.
*/
r = tor_snprintf(buf, sizeof(buf),
"Wbd="I64_FORMAT" Wbe="I64_FORMAT" Wbg="I64_FORMAT" Wbm="I64_FORMAT" "
"Wdb="I64_FORMAT" "
"Web="I64_FORMAT" Wed="I64_FORMAT" Wee="I64_FORMAT" Weg="I64_FORMAT
" Wem="I64_FORMAT" "
"Wgb="I64_FORMAT" Wgd="I64_FORMAT" Wgg="I64_FORMAT" Wgm="I64_FORMAT" "
"Wmb="I64_FORMAT" Wmd="I64_FORMAT" Wme="I64_FORMAT" Wmg="I64_FORMAT
" Wmm="I64_FORMAT"\n",
Wmd, Wme, Wmg, weight_scale,
weight_scale,
weight_scale, Wed, Wee, Wed, Wee,
weight_scale, Wgd, Wgg, Wgg,
weight_scale, Wmd, Wme, Wmg, weight_scale);
"Wbd=%d Wbe=%d Wbg=%d Wbm=%d "
"Wdb=%d "
"Web=%d Wed=%d Wee=%d Weg=%d Wem=%d "
"Wgb=%d Wgd=%d Wgg=%d Wgm=%d "
"Wmb=%d Wmd=%d Wme=%d Wmg=%d Wmm=%d\n",
(int)Wmd, (int)Wme, (int)Wmg, (int)weight_scale,
(int)weight_scale,
(int)weight_scale, (int)Wed, (int)Wee, (int)Wed, (int)Wee,
(int)weight_scale, (int)Wgd, (int)Wgg, (int)Wgg,
(int)weight_scale, (int)Wmd, (int)Wme, (int)Wmg, (int)weight_scale);
if (r<0) {
log_warn(LD_BUG,
"Not enough space in buffer for bandwidth-weights line.");