Mercurial > hg > nginx-quic
annotate src/core/ngx_buf.h @ 4664:356c91151658 stable-1.2
Merge of r4618: rewrite escaping fix (ticket #162).
The following code resulted in incorrect escaping of uri and possible
segfault:
location / {
rewrite ^(.*) $1?c=$1;
return 200 "$uri";
}
If there were arguments in a rewrite's replacement string, and length was
actually calculated (due to duplicate captures as in the example above,
or variables present), the is_args flag was set and incorrectly copied
after length calculation. This resulted in escaping applied to the uri part
of the replacement, resulting in incorrect escaping. Additionally, buffer
was allocated without escaping expected, thus this also resulted in buffer
overrun and possible segfault.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Mon, 04 Jun 2012 11:07:19 +0000 |
parents | d620f497c50f |
children | f9c83484d9ce |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
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5 */ |
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6 |
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7 |
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8 #ifndef _NGX_BUF_H_INCLUDED_ |
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9 #define _NGX_BUF_H_INCLUDED_ |
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12 #include <ngx_config.h> |
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13 #include <ngx_core.h> |
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14 |
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16 typedef void * ngx_buf_tag_t; |
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17 |
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18 typedef struct ngx_buf_s ngx_buf_t; |
100
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19 |
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20 struct ngx_buf_s { |
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21 u_char *pos; |
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22 u_char *last; |
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23 off_t file_pos; |
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24 off_t file_last; |
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25 |
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26 u_char *start; /* start of buffer */ |
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27 u_char *end; /* end of buffer */ |
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28 ngx_buf_tag_t tag; |
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29 ngx_file_t *file; |
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30 ngx_buf_t *shadow; |
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31 |
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32 |
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33 /* the buf's content could be changed */ |
343
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34 unsigned temporary:1; |
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35 |
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36 /* |
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37 * the buf's content is in a memory cache or in a read only memory |
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38 * and must not be changed |
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39 */ |
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40 unsigned memory:1; |
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41 |
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42 /* the buf's content is mmap()ed and must not be changed */ |
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43 unsigned mmap:1; |
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44 |
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45 unsigned recycled:1; |
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46 unsigned in_file:1; |
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47 unsigned flush:1; |
509 | 48 unsigned sync:1; |
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49 unsigned last_buf:1; |
509 | 50 unsigned last_in_chain:1; |
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51 |
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52 unsigned last_shadow:1; |
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53 unsigned temp_file:1; |
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54 |
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55 /* STUB */ int num; |
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56 }; |
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61
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58 |
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59 struct ngx_chain_s { |
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60 ngx_buf_t *buf; |
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61 ngx_chain_t *next; |
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62 }; |
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63 |
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64 |
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65 typedef struct { |
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66 ngx_int_t num; |
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67 size_t size; |
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68 } ngx_bufs_t; |
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69 |
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70 |
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71 typedef struct ngx_output_chain_ctx_s ngx_output_chain_ctx_t; |
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72 |
479 | 73 typedef ngx_int_t (*ngx_output_chain_filter_pt)(void *ctx, ngx_chain_t *in); |
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74 |
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75 #if (NGX_HAVE_FILE_AIO) |
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76 typedef void (*ngx_output_chain_aio_pt)(ngx_output_chain_ctx_t *ctx, |
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77 ngx_file_t *file); |
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78 #endif |
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79 |
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80 struct ngx_output_chain_ctx_s { |
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81 ngx_buf_t *buf; |
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82 ngx_chain_t *in; |
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83 ngx_chain_t *free; |
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84 ngx_chain_t *busy; |
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85 |
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86 unsigned sendfile:1; |
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87 unsigned directio:1; |
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88 #if (NGX_HAVE_ALIGNED_DIRECTIO) |
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89 unsigned unaligned:1; |
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90 #endif |
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91 unsigned need_in_memory:1; |
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92 unsigned need_in_temp:1; |
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93 #if (NGX_HAVE_FILE_AIO) |
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94 unsigned aio:1; |
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95 |
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96 ngx_output_chain_aio_pt aio_handler; |
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97 #endif |
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98 |
3053 | 99 off_t alignment; |
100 | |
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101 ngx_pool_t *pool; |
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102 ngx_int_t allocated; |
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103 ngx_bufs_t bufs; |
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104 ngx_buf_tag_t tag; |
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105 |
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106 ngx_output_chain_filter_pt output_filter; |
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107 void *filter_ctx; |
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108 }; |
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109 |
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110 |
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111 typedef struct { |
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112 ngx_chain_t *out; |
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113 ngx_chain_t **last; |
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114 ngx_connection_t *connection; |
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115 ngx_pool_t *pool; |
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116 off_t limit; |
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117 } ngx_chain_writer_ctx_t; |
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118 |
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119 |
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120 #define NGX_CHAIN_ERROR (ngx_chain_t *) NGX_ERROR |
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121 |
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122 |
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123 #define ngx_buf_in_memory(b) (b->temporary || b->memory || b->mmap) |
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124 #define ngx_buf_in_memory_only(b) (ngx_buf_in_memory(b) && !b->in_file) |
595 | 125 |
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126 #define ngx_buf_special(b) \ |
509 | 127 ((b->flush || b->last_buf || b->sync) \ |
128 && !ngx_buf_in_memory(b) && !b->in_file) | |
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129 |
595 | 130 #define ngx_buf_sync_only(b) \ |
131 (b->sync \ | |
132 && !ngx_buf_in_memory(b) && !b->in_file && !b->flush && !b->last_buf) | |
133 | |
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134 #define ngx_buf_size(b) \ |
499 | 135 (ngx_buf_in_memory(b) ? (off_t) (b->last - b->pos): \ |
136 (b->file_last - b->file_pos)) | |
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137 |
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138 ngx_buf_t *ngx_create_temp_buf(ngx_pool_t *pool, size_t size); |
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139 ngx_chain_t *ngx_create_chain_of_bufs(ngx_pool_t *pool, ngx_bufs_t *bufs); |
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140 |
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141 |
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142 #define ngx_alloc_buf(pool) ngx_palloc(pool, sizeof(ngx_buf_t)) |
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143 #define ngx_calloc_buf(pool) ngx_pcalloc(pool, sizeof(ngx_buf_t)) |
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144 |
507 | 145 ngx_chain_t *ngx_alloc_chain_link(ngx_pool_t *pool); |
146 #define ngx_free_chain(pool, cl) \ | |
147 cl->next = pool->chain; \ | |
148 pool->chain = cl | |
149 | |
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150 |
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151 |
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152 ngx_int_t ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in); |
479 | 153 ngx_int_t ngx_chain_writer(void *ctx, ngx_chain_t *in); |
162
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154 |
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155 ngx_int_t ngx_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain, |
499 | 156 ngx_chain_t *in); |
581 | 157 ngx_chain_t *ngx_chain_get_free_buf(ngx_pool_t *p, ngx_chain_t **free); |
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158 void ngx_chain_update_chains(ngx_pool_t *p, ngx_chain_t **free, |
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159 ngx_chain_t **busy, ngx_chain_t **out, ngx_buf_tag_t tag); |
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160 |
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161 |
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162 #endif /* _NGX_BUF_H_INCLUDED_ */ |