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annotate src/os/win32/ngx_shmem.c @ 9274:46ecad404a29 default tip

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Mail: reset imap tag to empty after authentication attempt. We need to reset the imap tag to empty after an authentication attempt completes, otherwise if the next line parsed is incomplete with no tag (e.g. empty line) then we use the "tag" from the previous buffer which is now definitely wrong and has been partially overwritten with the most recently read data (e.g. CRLF). An example before this patch: S: * OK IMAP4 ready C: foobar login a b S: foobar NO Incorrect username or password. C: S: S: obar BAD invalid command Then with this patch: S: * OK IMAP4 ready C: foobar login a b S: foobar NO Incorrect username or password. C: S: * BAD invalid command
author Rob Mueller <robm@fastmailteam.com>
date Wed, 15 May 2024 10:06:00 +0300
parents af7eba90645d
children
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 * Copyright (C) Nginx, Inc.
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5 */
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10
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12 /*
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13 * Base addresses selected by system for shared memory mappings are likely
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14 * to be different on Windows Vista and later versions due to address space
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15 * layout randomization. This is however incompatible with storing absolute
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16 * addresses within the shared memory.
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17 *
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18 * To make it possible to store absolute addresses we create mappings
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19 * at the same address in all processes by starting mappings at predefined
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20 * addresses. The addresses were selected somewhat randomly in order to
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21 * minimize the probability that some other library doing something similar
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22 * conflicts with us. The addresses are from the following typically free
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23 * blocks:
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24 *
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25 * - 0x10000000 .. 0x70000000 (about 1.5 GB in total) on 32-bit platforms
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26 * - 0x000000007fff0000 .. 0x000007f68e8b0000 (about 8 TB) on 64-bit platforms
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27 *
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28 * Additionally, we allow to change the mapping address once it was detected
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29 * to be different from one originally used. This is needed to support
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30 * reconfiguration.
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31 */
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32
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33
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34 #ifdef _WIN64
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35 #define NGX_SHMEM_BASE 0x0000047047e00000
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36 #else
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37 #define NGX_SHMEM_BASE 0x2efe0000
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38 #endif
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39
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41 ngx_uint_t ngx_allocation_granularity;
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42
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43
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44 ngx_int_t
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45 ngx_shm_alloc(ngx_shm_t *shm)
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46 {
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47 u_char *name;
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48 uint64_t size;
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49 static u_char *base = (u_char *) NGX_SHMEM_BASE;
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50
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51 name = ngx_alloc(shm->name.len + 2 + NGX_INT32_LEN, shm->log);
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52 if (name == NULL) {
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53 return NGX_ERROR;
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54 }
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55
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56 (void) ngx_sprintf(name, "%V_%s%Z", &shm->name, ngx_unique);
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57
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58 ngx_set_errno(0);
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59
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60 size = shm->size;
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61
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62 shm->handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE,
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63 (u_long) (size >> 32),
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64 (u_long) (size & 0xffffffff),
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65 (char *) name);
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66
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67 if (shm->handle == NULL) {
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68 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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69 "CreateFileMapping(%uz, %s) failed",
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70 shm->size, name);
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71 ngx_free(name);
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72
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73 return NGX_ERROR;
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74 }
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75
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76 ngx_free(name);
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77
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78 if (ngx_errno == ERROR_ALREADY_EXISTS) {
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79 shm->exists = 1;
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80 }
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81
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82 shm->addr = MapViewOfFileEx(shm->handle, FILE_MAP_WRITE, 0, 0, 0, base);
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83
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84 if (shm->addr != NULL) {
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85 base += ngx_align(size, ngx_allocation_granularity);
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86 return NGX_OK;
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87 }
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88
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89 ngx_log_debug3(NGX_LOG_DEBUG_CORE, shm->log, ngx_errno,
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90 "MapViewOfFileEx(%uz, %p) of file mapping \"%V\" failed, "
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91 "retry without a base address",
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92 shm->size, base, &shm->name);
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93
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94 /*
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95 * Order of shared memory zones may be different in the master process
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96 * and worker processes after reconfiguration. As a result, the above
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97 * may fail due to a conflict with a previously created mapping remapped
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98 * to a different address. Additionally, there may be a conflict with
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99 * some other uses of the memory. In this case we retry without a base
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100 * address to let the system assign the address itself.
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101 */
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102
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103 shm->addr = MapViewOfFile(shm->handle, FILE_MAP_WRITE, 0, 0, 0);
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104
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105 if (shm->addr != NULL) {
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106 return NGX_OK;
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107 }
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108
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109 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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110 "MapViewOfFile(%uz) of file mapping \"%V\" failed",
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111 shm->size, &shm->name);
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112
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113 if (CloseHandle(shm->handle) == 0) {
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114 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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115 "CloseHandle() of file mapping \"%V\" failed",
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116 &shm->name);
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117 }
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118
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119 return NGX_ERROR;
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120 }
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121
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122
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123 ngx_int_t
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124 ngx_shm_remap(ngx_shm_t *shm, u_char *addr)
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125 {
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126 if (UnmapViewOfFile(shm->addr) == 0) {
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127 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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128 "UnmapViewOfFile(%p) of file mapping \"%V\" failed",
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129 shm->addr, &shm->name);
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130 return NGX_ERROR;
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131 }
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Maxim Dounin <mdounin@mdounin.ru>
parents: 4570
diff changeset
132
af7eba90645d Win32: shared memory base addresses and remapping.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4570
diff changeset
133 shm->addr = MapViewOfFileEx(shm->handle, FILE_MAP_WRITE, 0, 0, 0, addr);
af7eba90645d Win32: shared memory base addresses and remapping.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4570
diff changeset
134
af7eba90645d Win32: shared memory base addresses and remapping.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4570
diff changeset
135 if (shm->addr != NULL) {
af7eba90645d Win32: shared memory base addresses and remapping.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4570
diff changeset
136 return NGX_OK;
af7eba90645d Win32: shared memory base addresses and remapping.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4570
diff changeset
137 }
af7eba90645d Win32: shared memory base addresses and remapping.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4570
diff changeset
138
af7eba90645d Win32: shared memory base addresses and remapping.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4570
diff changeset
139 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
af7eba90645d Win32: shared memory base addresses and remapping.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4570
diff changeset
140 "MapViewOfFileEx(%uz, %p) of file mapping \"%V\" failed",
af7eba90645d Win32: shared memory base addresses and remapping.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4570
diff changeset
141 shm->size, addr, &shm->name);
af7eba90645d Win32: shared memory base addresses and remapping.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4570
diff changeset
142
af7eba90645d Win32: shared memory base addresses and remapping.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4570
diff changeset
143 return NGX_ERROR;
af7eba90645d Win32: shared memory base addresses and remapping.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4570
diff changeset
144 }
af7eba90645d Win32: shared memory base addresses and remapping.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4570
diff changeset
145
af7eba90645d Win32: shared memory base addresses and remapping.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4570
diff changeset
146
605
5dac8c7fb71b nginx-0.3.24-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
147 void
5dac8c7fb71b nginx-0.3.24-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
148 ngx_shm_free(ngx_shm_t *shm)
5dac8c7fb71b nginx-0.3.24-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
149 {
5dac8c7fb71b nginx-0.3.24-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
150 if (UnmapViewOfFile(shm->addr) == 0) {
5dac8c7fb71b nginx-0.3.24-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
151 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
2904
474a9daf8c80 *) fix memory leak in successful case
Igor Sysoev <igor@sysoev.ru>
parents: 2903
diff changeset
152 "UnmapViewOfFile(%p) of file mapping \"%V\" failed",
474a9daf8c80 *) fix memory leak in successful case
Igor Sysoev <igor@sysoev.ru>
parents: 2903
diff changeset
153 shm->addr, &shm->name);
605
5dac8c7fb71b nginx-0.3.24-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
154 }
5dac8c7fb71b nginx-0.3.24-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
155
5dac8c7fb71b nginx-0.3.24-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
156 if (CloseHandle(shm->handle) == 0) {
5dac8c7fb71b nginx-0.3.24-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
157 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
2904
474a9daf8c80 *) fix memory leak in successful case
Igor Sysoev <igor@sysoev.ru>
parents: 2903
diff changeset
158 "CloseHandle() of file mapping \"%V\" failed",
474a9daf8c80 *) fix memory leak in successful case
Igor Sysoev <igor@sysoev.ru>
parents: 2903
diff changeset
159 &shm->name);
605
5dac8c7fb71b nginx-0.3.24-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
160 }
5dac8c7fb71b nginx-0.3.24-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
161 }