Mercurial > hg > index.cgi
annotate lwlink/map.c @ 342:12e2453f8417
Fix potential memory access after free in lw_expr_simplify_go()
Thanks to Erik Gavriluk (erik@bombfactory.com) for spotting a missing "else"
when attempting to resolve a "special" reference. This could have led to
access to memory that had already been freed if a "special" resolved to an
expression that also referenced the same special (a circular reference).
Whether that can actually happen is questionable but the check must have
been added for a reason so it follows that it should be done correctly.
This also brings the code in line with similar code resolving symbol
references which makes a similar check.
author | William Astle <lost@l-w.ca> |
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date | Sat, 14 Mar 2015 14:06:13 -0600 |
parents | d389adbcc4ab |
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rev | line source |
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1 /* |
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2 map.c |
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3 Copyright © 2009 William Astle |
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4 |
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5 This file is part of LWLINK. |
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6 |
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7 LWLINK is free software: you can redistribute it and/or modify it under the |
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8 terms of the GNU General Public License as published by the Free Software |
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9 Foundation, either version 3 of the License, or (at your option) any later |
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10 version. |
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11 |
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12 This program is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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15 more details. |
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16 |
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17 You should have received a copy of the GNU General Public License along with |
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18 this program. If not, see <http://www.gnu.org/licenses/>. |
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19 |
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20 |
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21 Output information about the linking process |
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22 */ |
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23 |
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24 #include <errno.h> |
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25 #include <stdio.h> |
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26 #include <stdlib.h> |
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27 #include <string.h> |
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28 |
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29 #include <lw_alloc.h> |
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30 |
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31 #include "lwlink.h" |
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32 |
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33 struct symliste |
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34 { |
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35 char *name; |
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36 char *fn; |
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37 int addr; |
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38 int ext; |
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39 struct symliste *next; |
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40 }; |
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41 |
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42 void display_map(void) |
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43 { |
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44 FILE *of; |
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45 int sn; |
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46 int std = 0; |
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47 struct symliste *slist = NULL; |
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48 struct symliste *ce, *pe, *ne; |
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49 symtab_t *sym; |
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50 int i; |
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51 symlist_t *se; |
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52 |
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53 if (!strcmp(map_file, "-")) |
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54 { |
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55 std = 1; |
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56 of = stdout; |
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57 } |
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58 else |
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59 { |
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60 of = fopen(map_file, "w"); |
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61 if (!of) |
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62 { |
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63 fprintf(stderr, "Cannot open map file - using stdout\n"); |
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64 std = 1; |
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65 of = stdout; |
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66 } |
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67 } |
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68 |
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69 // display section list |
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70 for (sn = 0; sn < nsects; sn++) |
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71 { |
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72 fprintf(of, "Section: %s (%s) load at %04X, length %04X\n", |
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73 sanitize_symbol((char*)(sectlist[sn].ptr -> name)), |
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74 sectlist[sn].ptr -> file -> filename, |
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75 sectlist[sn].ptr -> loadaddress, |
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76 sectlist[sn].ptr -> codesize |
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77 ); |
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78 } |
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79 |
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80 // generate a sorted list of symbols and display it |
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81 |
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82 for (se = symlist; se; se = se -> next) |
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83 { |
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84 for (pe = NULL, ce = slist; ce; ce = ce -> next) |
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85 { |
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86 i = strcmp(ce -> name, se -> sym); |
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87 if (i > 0) |
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88 { |
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89 break; |
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90 } |
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91 pe = ce; |
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92 } |
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93 |
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94 ne = lw_alloc(sizeof(struct symliste)); |
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95 ne -> ext = 1; |
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96 ne -> addr = se -> val; |
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97 ne -> next = ce; |
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98 ne -> name = se -> sym; |
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99 ne -> fn = "<synthetic>"; |
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100 if (pe) |
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101 pe -> next = ne; |
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102 else |
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103 slist = ne; |
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104 } |
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105 |
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106 for (sn = 0; sn < nsects; sn++) |
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107 { |
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108 for (sym = sectlist[sn].ptr -> localsyms; sym; sym = sym -> next) |
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109 { |
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110 for (pe = NULL, ce = slist; ce; ce = ce -> next) |
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111 { |
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112 i = strcmp(ce -> name, (char *)(sym -> sym)); |
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113 if (i == 0) |
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114 { |
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115 i = strcmp(ce -> fn, sectlist[sn].ptr -> file -> filename); |
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116 } |
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117 if (i > 0) |
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118 break; |
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119 pe = ce; |
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120 } |
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121 ne = lw_alloc(sizeof(struct symliste)); |
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122 ne -> ext = 0; |
156
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Added 'constant' sections to object file handling for lwasm and lwlink
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123 if (sectlist[sn].ptr -> flags & SECTION_CONST) |
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124 ne -> addr = sym -> offset; |
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125 else |
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126 ne -> addr = sym -> offset + sectlist[sn].ptr -> loadaddress; |
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127 ne -> next = ce; |
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Clean up insane number of compiler warnings under -Wall
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128 ne -> name = (char *)(sym -> sym); |
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129 ne -> fn = sectlist[sn].ptr -> file -> filename; |
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Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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130 if (pe) |
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131 pe -> next = ne; |
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132 else |
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133 slist = ne; |
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134 } |
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135 } |
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136 |
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137 for (ce = slist; ce; ce = ce -> next) |
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138 { |
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139 fprintf(of, "Symbol: %s (%s) = %04X\n", sanitize_symbol(ce -> name), ce -> fn, ce -> addr); |
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140 } |
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141 |
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142 if (!std) |
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143 fclose(of); |
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144 } |