[444] | 1 | /* Support for reading /etc/ld.so.cache files written by Linux ldconfig. |
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| 2 | Copyright (C) 1999, 2000 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, write to the Free |
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| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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| 18 | 02111-1307 USA. */ |
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| 19 | |
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| 20 | #include <stdint.h> |
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| 21 | |
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| 22 | #ifndef _DL_CACHE_DEFAULT_ID |
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| 23 | # define _DL_CACHE_DEFAULT_ID 3 |
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| 24 | #endif |
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| 25 | |
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| 26 | #ifndef _dl_cache_check_flags |
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| 27 | # define _dl_cache_check_flags(flags) \ |
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| 28 | ((flags) == 1 || (flags) == _DL_CACHE_DEFAULT_ID) |
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| 29 | #endif |
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| 30 | |
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| 31 | #ifndef SYSCONFDIR |
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| 32 | # define SYSCONFDIR "/etc" |
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| 33 | #endif |
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| 34 | |
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| 35 | #ifndef LD_SO_CACHE |
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| 36 | # define LD_SO_CACHE SYSCONFDIR "/ld.so.cache" |
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| 37 | #endif |
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| 38 | |
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| 39 | #define CACHEMAGIC "ld.so-1.7.0" |
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| 40 | |
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| 41 | /* libc5 and glibc 2.0/2.1 use the same format. For glibc 2.2 another |
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| 42 | format has been added in a compatible way: |
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| 43 | The beginning of the string table is used for the new table: |
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| 44 | old_magic |
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| 45 | nlibs |
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| 46 | libs[0] |
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| 47 | ... |
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| 48 | libs[nlibs-1] |
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| 49 | pad, new magic needs to be aligned |
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| 50 | - this is string[0] for the old format |
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| 51 | new magic - this is string[0] for the new format |
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| 52 | newnlibs |
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| 53 | ... |
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| 54 | newlibs[0] |
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| 55 | ... |
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| 56 | newlibs[newnlibs-1] |
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| 57 | string 1 |
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| 58 | string 2 |
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| 59 | ... |
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| 60 | */ |
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| 61 | struct file_entry |
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| 62 | { |
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| 63 | int flags; /* This is 1 for an ELF library. */ |
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| 64 | unsigned int key, value; /* String table indices. */ |
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| 65 | }; |
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| 66 | |
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| 67 | struct cache_file |
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| 68 | { |
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| 69 | char magic[sizeof CACHEMAGIC - 1]; |
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| 70 | unsigned int nlibs; |
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| 71 | struct file_entry libs[0]; |
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| 72 | }; |
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| 73 | |
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| 74 | #define CACHEMAGIC_NEW "glibc-ld.so.cache" |
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| 75 | #define CACHE_VERSION "1.1" |
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| 76 | #define CACHEMAGIC_VERSION_NEW CACHEMAGIC_NEW CACHE_VERSION |
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| 77 | |
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| 78 | |
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| 79 | struct file_entry_new |
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| 80 | { |
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| 81 | int32_t flags; /* This is 1 for an ELF library. */ |
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| 82 | uint32_t key, value; /* String table indices. */ |
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| 83 | uint32_t osversion; /* Required OS version. */ |
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| 84 | uint64_t hwcap; /* Hwcap entry. */ |
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| 85 | }; |
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| 86 | |
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| 87 | struct cache_file_new |
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| 88 | { |
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| 89 | char magic[sizeof CACHEMAGIC_NEW - 1]; |
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| 90 | char version[sizeof CACHE_VERSION - 1]; |
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| 91 | uint32_t nlibs; /* Number of entries. */ |
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| 92 | uint32_t len_strings; /* Size of string table. */ |
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| 93 | uint32_t unused[5]; /* Leave space for future extensions |
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| 94 | and align to 8 byte boundary. */ |
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| 95 | struct file_entry_new libs[0]; /* Entries describing libraries. */ |
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| 96 | /* After this the string table of size len_strings is found. */ |
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| 97 | }; |
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| 98 | |
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| 99 | /* Used to align cache_file_new. */ |
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| 100 | #define ALIGN_CACHE(addr) \ |
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| 101 | (((addr) + __alignof__ (struct cache_file_new) -1) \ |
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| 102 | & (~(__alignof__ (struct cache_file_new) - 1))) |
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| 103 | |
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| 104 | static int |
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| 105 | _dl_cache_libcmp (const char *p1, const char *p2) |
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| 106 | { |
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| 107 | while (*p1 != '\0') |
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| 108 | { |
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| 109 | if (*p1 >= '0' && *p1 <= '9') |
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| 110 | { |
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| 111 | if (*p2 >= '0' && *p2 <= '9') |
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| 112 | { |
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| 113 | /* Must compare this numerically. */ |
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| 114 | int val1; |
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| 115 | int val2; |
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| 116 | |
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| 117 | val1 = *p1++ - '0'; |
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| 118 | val2 = *p2++ - '0'; |
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| 119 | while (*p1 >= '0' && *p1 <= '9') |
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| 120 | val1 = val1 * 10 + *p1++ - '0'; |
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| 121 | while (*p2 >= '0' && *p2 <= '9') |
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| 122 | val2 = val2 * 10 + *p2++ - '0'; |
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| 123 | if (val1 != val2) |
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| 124 | return val1 - val2; |
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| 125 | } |
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| 126 | else |
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| 127 | return 1; |
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| 128 | } |
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| 129 | else if (*p2 >= '0' && *p2 <= '9') |
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| 130 | return -1; |
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| 131 | else if (*p1 != *p2) |
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| 132 | return *p1 - *p2; |
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| 133 | else |
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| 134 | { |
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| 135 | ++p1; |
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| 136 | ++p2; |
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| 137 | } |
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| 138 | } |
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| 139 | return *p1 - *p2; |
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| 140 | } |
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