├── .github └── workflows │ └── continuous.yml ├── .gitignore ├── COPYING ├── COPYING.RUNTIME ├── COPYING.libgcc ├── COPYING.libstdc++ ├── COPYING3 ├── README.md ├── checkrt.c ├── example ├── Makefile ├── README.md ├── build.sh ├── example.cpp ├── example.desktop └── example.png ├── exec.c ├── generate.sh └── template.sh /.github/workflows/continuous.yml: -------------------------------------------------------------------------------- 1 | name: Continuous release 2 | 3 | on: [push, pull_request, workflow_dispatch] 4 | 5 | env: 6 | APPIMAGE_EXTRACT_AND_RUN: 1 7 | TERM: xterm-256color 8 | 9 | jobs: 10 | generate: 11 | name: Generate plugin script 12 | runs-on: ubuntu-latest 13 | steps: 14 | - uses: actions/checkout@v3 15 | - name: Generate script 16 | run: | 17 | bash -xe generate.sh 18 | - name: Archive artifacts 19 | uses: actions/upload-artifact@v4 20 | with: 21 | name: Script 22 | path: linuxdeploy-plugin-checkrt.sh 23 | 24 | upload: 25 | name: Create release and upload artifacts 26 | runs-on: ubuntu-latest 27 | needs: 28 | - generate 29 | steps: 30 | - name: Download artifacts 31 | uses: actions/download-artifact@v4 32 | - name: Inspect directory after downloading artifacts 33 | run: ls -alFR 34 | - name: Create release and upload artifacts 35 | env: 36 | GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} 37 | run: | 38 | wget -q https://github.com/TheAssassin/pyuploadtool/releases/download/continuous/pyuploadtool-x86_64.AppImage 39 | chmod +x pyuploadtool-x86_64.AppImage 40 | ./pyuploadtool-x86_64.AppImage **/linuxdeploy-plugin-checkrt.sh 41 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | *.o 2 | *.so 3 | *.AppImage 4 | a.out 5 | 6 | example/appdir 7 | example/example 8 | 9 | linuxdeploy-plugin-checkrt.sh 10 | -------------------------------------------------------------------------------- /COPYING: -------------------------------------------------------------------------------- 1 | checkrt.c: 2022-2023 2 | exec.c: 2018 Pablo Marcos Oltra 3 | 4 | The MIT License 5 | 6 | Permission is hereby granted, free of charge, to any person obtaining a copy 7 | of this software and associated documentation files (the "Software"), to deal 8 | in the Software without restriction, including without limitation the rights 9 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 | copies of the Software, and to permit persons to whom the Software is 11 | furnished to do so, subject to the following conditions: 12 | 13 | The above copyright notice and this permission notice shall be included in all 14 | copies or substantial portions of the Software. 15 | 16 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 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To "grant" such a patent license to a 496 | party means to make such an agreement or commitment not to enforce a 497 | patent against the party. 498 | 499 | If you convey a covered work, knowingly relying on a patent license, 500 | and the Corresponding Source of the work is not available for anyone 501 | to copy, free of charge and under the terms of this License, through a 502 | publicly available network server or other readily accessible means, 503 | then you must either (1) cause the Corresponding Source to be so 504 | available, or (2) arrange to deprive yourself of the benefit of the 505 | patent license for this particular work, or (3) arrange, in a manner 506 | consistent with the requirements of this License, to extend the patent 507 | license to downstream recipients. "Knowingly relying" means you have 508 | actual knowledge that, but for the patent license, your conveying the 509 | covered work in a country, or your recipient's use of the covered work 510 | in a country, would infringe one or more identifiable patents in that 511 | country that you have reason to believe are valid. 512 | 513 | If, pursuant to or in connection with a single transaction or 514 | arrangement, you convey, or propagate by procuring conveyance of, a 515 | covered work, and grant a patent license to some of the parties 516 | receiving the covered work authorizing them to use, propagate, modify 517 | or convey a specific copy of the covered work, then the patent license 518 | you grant is automatically extended to all recipients of the covered 519 | work and works based on it. 520 | 521 | A patent license is "discriminatory" if it does not include within 522 | the scope of its coverage, prohibits the exercise of, or is 523 | conditioned on the non-exercise of one or more of the rights that are 524 | specifically granted under this License. You may not convey a covered 525 | work if you are a party to an arrangement with a third party that is 526 | in the business of distributing software, under which you make payment 527 | to the third party based on the extent of your activity of conveying 528 | the work, and under which the third party grants, to any of the 529 | parties who would receive the covered work from you, a discriminatory 530 | patent license (a) in connection with copies of the covered work 531 | conveyed by you (or copies made from those copies), or (b) primarily 532 | for and in connection with specific products or compilations that 533 | contain the covered work, unless you entered into that arrangement, 534 | or that patent license was granted, prior to 28 March 2007. 535 | 536 | Nothing in this License shall be construed as excluding or limiting 537 | any implied license or other defenses to infringement that may 538 | otherwise be available to you under applicable patent law. 539 | 540 | 12. No Surrender of Others' Freedom. 541 | 542 | If conditions are imposed on you (whether by court order, agreement or 543 | otherwise) that contradict the conditions of this License, they do not 544 | excuse you from the conditions of this License. If you cannot convey a 545 | covered work so as to satisfy simultaneously your obligations under this 546 | License and any other pertinent obligations, then as a consequence you may 547 | not convey it at all. For example, if you agree to terms that obligate you 548 | to collect a royalty for further conveying from those to whom you convey 549 | the Program, the only way you could satisfy both those terms and this 550 | License would be to refrain entirely from conveying the Program. 551 | 552 | 13. Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | linuxdeploy-plugin-checkrt 2 | -------------------------- 3 | 4 | This linuxdeploy plugin allows you to deploy `libstdc++.so.6` and `libgcc_s.so.1` 5 | without breaking compatibility. The installed AppRun hook script will compare the 6 | symbol version numbers between the deployed libraries and those on your system 7 | and only add the deployed ones to `LD_LIBRARY_PATH` if they're newer. 8 | 9 | Additionally the library `exec.so` is deployed and will be preloaded by AppRun if 10 | it's found. This library is intended to restore the environment of the AppImage's 11 | parent process in order to avoid library clashing of bundled libraries with external 12 | processes called from within the AppImage (i.e. when a webbrowser is opened or a 13 | terminal emulator is started). 14 | If you don't want `exec.so` then simply delete it before creating your final AppImage. 15 | 16 | Requirements 17 | ------------ 18 | C compiler (GCC or Clang) 19 | 20 | Usage 21 | ----- 22 | ``` sh 23 | # get linuxdeploy and linuxdeploy-plugin-checkrt and make them executable 24 | wget -c "https://github.com/darealshinji/linuxdeploy-plugin-checkrt/releases/download/continuous/linuxdeploy-plugin-checkrt.sh" 25 | wget -c "https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage" 26 | chmod a+x linuxdeploy-x86_64.AppImage linuxdeploy-plugin-checkrt.sh 27 | 28 | # add GCC's libraries to the search path 29 | # and call through linuxdeploy using the `--plugin checkrt` option 30 | LD_LIBRARY_PATH="/path/to/my/gcc-snapshot/lib64" \ 31 | ./linuxdeploy-x86_64.AppImage --appdir AppDir --plugin checkrt --output appimage --icon-file mypackage.png --desktop-file mypackage.desktop 32 | ``` 33 | 34 | Why? 35 | ---- 36 | `libstdc++.so.6` and `libgcc_s.so.1` are part of GCC and if you compile code it 37 | will be linked against these libraries if required. If you use a newer version 38 | of GCC than normally available on your system these libraries will also be newer 39 | and chances are high that your program - linked against these newer versions - is 40 | no longer compatible to those installed by default on your system. 41 | 42 | Starting your program would get you an error message like this: 43 | ``` 44 | ./myApp: /lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.29' not found (required by ./myApp) 45 | ``` 46 | 47 | However you cannot simply bundle these libraries as usual. If the AppImage is 48 | started on a different system and an unbundled system library depends on a newer 49 | version than available from the AppImage it won't work either. 50 | 51 | This linuxdeploy plugin will install a hook script that quickly checks and compares 52 | the internal version number of the libraries and only adds them to the search 53 | path if they're newer. 54 | 55 | Hacking 56 | ------- 57 | The file `linuxdeploy-plugin-checkrt.sh` is created from `generate.sh`. 58 | To add changes to the plugin you must edit the other files and then run `./generate.sh`. 59 | -------------------------------------------------------------------------------- /checkrt.c: -------------------------------------------------------------------------------- 1 | /* Copyright (c) 2022-2025 Carsten Janssen 2 | * 3 | * Permission is hereby granted, free of charge, to any person obtaining a copy 4 | * of this software and associated documentation files (the "Software"), to deal 5 | * in the Software without restriction, including without limitation the rights 6 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 7 | * copies of the Software, and to permit persons to whom the Software is 8 | * furnished to do so, subject to the following conditions: 9 | * 10 | * The above copyright notice and this permission notice shall be included in all 11 | * copies or substantial portions of the Software. 12 | * 13 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 14 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 16 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 17 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 18 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 19 | * SOFTWARE. 20 | */ 21 | 22 | #ifndef _GNU_SOURCE 23 | #define _GNU_SOURCE 24 | #endif 25 | #include 26 | #include 27 | #include 28 | #include 29 | #include 30 | #include 31 | #include 32 | #include 33 | #include 34 | #include 35 | #include 36 | #include 37 | #include 38 | #include 39 | #include 40 | #include 41 | #include 42 | 43 | #if defined(_LP64) || defined(__LP64__) 44 | typedef Elf64_Ehdr Elf_Ehdr; 45 | typedef Elf64_Shdr Elf_Shdr; 46 | typedef Elf64_Sym Elf_Sym; 47 | #else 48 | typedef Elf32_Ehdr Elf_Ehdr; 49 | typedef Elf32_Shdr Elf_Shdr; 50 | typedef Elf32_Sym Elf_Sym; 51 | #endif 52 | 53 | 54 | /* debug messages */ 55 | #define DEBUG_PRINT(MSG, ...) \ 56 | if (debug_mode) { \ 57 | fprintf(stderr, "[DEBUG] %s: " MSG "\n", __func__, __VA_ARGS__); \ 58 | } 59 | 60 | static bool debug_mode = false; 61 | static bool full_debug_mode = false; 62 | 63 | 64 | /* index values */ 65 | #define STDCXX 0 66 | #define LIBGCC 1 67 | static int idx = STDCXX; 68 | 69 | 70 | /* save strings and string lengths as const values */ 71 | #define SET_ARRAY(VARNAME, ENTRY1, ENTRY2) \ 72 | static const char * const VARNAME[2] = { ENTRY1, ENTRY2 }; \ 73 | static const size_t VARNAME##_len[2] = { sizeof(ENTRY1)-1, sizeof(ENTRY2)-1 } 74 | 75 | SET_ARRAY(libname, "libstdc++.so.6", "libgcc_s.so.1"); 76 | SET_ARRAY(subdir, "cxx", "gcc"); 77 | SET_ARRAY(prefix, "GLIBCXX_", "GCC_"); 78 | 79 | 80 | static void errx_dlerror(const char *filename, const char *msg) __attribute__((noreturn)); 81 | static void *load_lib_new_namespace(const char *filename) __attribute__((returns_nonnull)); 82 | 83 | 84 | 85 | static void errx_dlerror(const char *filename, const char *msg) 86 | { 87 | const char *p = dlerror(); 88 | 89 | if (p) { 90 | errx(1, "%s\n%s", msg, p); 91 | } else { 92 | errx(1, "%s: %s", msg, filename); 93 | } 94 | } 95 | 96 | /* load library into new namespace; 97 | * dlmopen() will also perform compatibility checks for us */ 98 | static void *load_lib_new_namespace(const char *filename) 99 | { 100 | void *handle = dlmopen(LM_ID_NEWLM, filename, RTLD_LAZY); 101 | 102 | if (!handle) { 103 | errx_dlerror(filename, "dlmopen() failed to load library"); 104 | } 105 | 106 | return handle; 107 | } 108 | 109 | /* retrieve full path of system library */ 110 | static char *get_system_library_path(void) 111 | { 112 | struct link_map *map = NULL; 113 | 114 | void *handle = load_lib_new_namespace(libname[idx]); 115 | 116 | if (dlinfo(handle, RTLD_DI_LINKMAP, &map) == -1) { 117 | errx_dlerror(libname[idx], "dlinfo() could not retrieve information from library"); 118 | } 119 | 120 | if (!map->l_name || map->l_name[0] == 0) { 121 | errx(1, "%s: %s", libname[idx], "dlinfo() failed to get absolute pathname"); 122 | } 123 | 124 | char *path = strdup(map->l_name); 125 | DEBUG_PRINT("%s resolved to: %s", libname[idx], path); 126 | 127 | dlclose(handle); 128 | 129 | return path; 130 | } 131 | 132 | /* copy library from system into directory next to binary */ 133 | static void copy_lib(const char *dir, int flag) 134 | { 135 | ssize_t nread; 136 | uint8_t buf[512*1024]; 137 | 138 | assert(flag == STDCXX || flag == LIBGCC); 139 | idx = flag; 140 | 141 | /* find library */ 142 | char *src = get_system_library_path(); 143 | printf("Copy library: %s\n", src); 144 | 145 | /* create target directory */ 146 | char *target = malloc(strlen(dir) + subdir_len[idx] + libname_len[idx] + 3); 147 | sprintf(target, "%s/%s/", dir, subdir[idx]); 148 | mkdir(target, 0775); 149 | 150 | /* open source file for reading */ 151 | int fd_in = open(src, O_RDONLY); 152 | if (fd_in < 0) err(1, "cannot open file for reading: %s", src); 153 | 154 | /* open target file for writing */ 155 | strcat(target, libname[idx]); 156 | int fd_out = open(target, O_WRONLY | O_CREAT | O_TRUNC, 0664); 157 | if (fd_out < 0) err(1, "cannot open file for writing: %s", target); 158 | 159 | /* copy file content */ 160 | while ((nread = read(fd_in, buf, sizeof(buf))) > 0) { 161 | if (write(fd_out, buf, nread) != nread) { 162 | err(1, "error writing to file: %s", target); 163 | } 164 | } 165 | 166 | if (nread == -1) { 167 | err(1, "error reading from file: %s", src); 168 | } 169 | 170 | /* free resources */ 171 | close(fd_out); 172 | close(fd_in); 173 | free(src); 174 | free(target); 175 | } 176 | 177 | /* find symbol by prefix */ 178 | static char *find_symbol(const char *path, size_t length, uint8_t *addr) 179 | { 180 | size_t res = 0; 181 | 182 | /* filesize check */ 183 | #define CHECK_FSIZE(x) \ 184 | if (x >= length) { \ 185 | errx(1, "%s", "*** offset exceeds filesize ***"); \ 186 | } 187 | 188 | /* overflow + filesize check */ 189 | #define CHECK_OVERFLOW(a, b) \ 190 | if (__builtin_add_overflow(a, b, &res)) { \ 191 | errx(1, "%s", "*** overflow detected ***"); \ 192 | } \ 193 | CHECK_FSIZE(res) 194 | 195 | 196 | /* get string table */ 197 | Elf_Ehdr *ehdr = (Elf_Ehdr *)addr; 198 | 199 | CHECK_OVERFLOW(ehdr->e_shoff, ehdr->e_shstrndx); 200 | Elf_Shdr *shdr = (Elf_Shdr *)(addr + ehdr->e_shoff); 201 | Elf_Shdr *strtab = shdr + ehdr->e_shstrndx; 202 | size_t dynstr_off = 0; 203 | 204 | CHECK_FSIZE(strtab->sh_offset); 205 | const char *data = (const char *)(addr + strtab->sh_offset); 206 | 207 | /* get .dynstr section */ 208 | for (size_t i = 0; i < ehdr->e_shnum; i++) { 209 | CHECK_OVERFLOW(strtab->sh_offset, shdr[i].sh_name); 210 | 211 | if (strcmp(data + shdr[i].sh_name, ".dynstr") == 0) { 212 | dynstr_off = shdr[i].sh_offset; 213 | break; 214 | } 215 | } 216 | 217 | if (dynstr_off == 0) return NULL; 218 | CHECK_FSIZE(dynstr_off); 219 | 220 | const char *symbol = NULL; 221 | data = (const char *)(addr + dynstr_off); 222 | 223 | /* look for section header type SHT_DYNSYM */ 224 | for (size_t i = 0; i < ehdr->e_shnum; i++) { 225 | if (shdr[i].sh_type != SHT_DYNSYM) { 226 | continue; 227 | } 228 | 229 | CHECK_FSIZE(shdr[i].sh_offset); 230 | Elf_Sym *sym = (Elf_Sym *)(addr + shdr[i].sh_offset); 231 | 232 | /* do some extra checks to prevent floating-point exceptions 233 | * or similar issues */ 234 | if (shdr[i].sh_size < shdr[i].sh_entsize || 235 | shdr[i].sh_size == 0 || 236 | shdr[i].sh_entsize == 0) 237 | { 238 | errx(1, "problematic math division [%zu/%zu] found in section header: %s", 239 | shdr[i].sh_size, shdr[i].sh_entsize, path); 240 | } 241 | 242 | /* parse symbols */ 243 | for (size_t j = 0; j < (shdr[i].sh_size / shdr[i].sh_entsize); j++) { 244 | CHECK_OVERFLOW(dynstr_off, sym[j].st_name); 245 | const char *name = data + sym[j].st_name; 246 | 247 | if (ELF64_ST_TYPE(sym[j].st_info) == STT_OBJECT && /* data object */ 248 | ELF64_ST_BIND(sym[j].st_info) == STB_GLOBAL && /* global symbol */ 249 | ELF64_ST_VISIBILITY(sym[j].st_other) == STV_DEFAULT && /* default symbol visibility */ 250 | strncmp(name, prefix[idx], prefix_len[idx]) == 0 && /* symbol name starts with prefix */ 251 | isdigit(*(name + prefix_len[idx])) && /* first byte after prefix is a digit */ 252 | strchr(name + prefix_len[idx], '.') && /* symbol name contains a dot */ 253 | (!symbol || strverscmp(symbol, name) < 0)) /* save higher version string */ 254 | { 255 | if (full_debug_mode) { 256 | DEBUG_PRINT("%s", name); 257 | } 258 | symbol = name; 259 | } 260 | } 261 | } 262 | 263 | return symbol ? strdup(symbol) : NULL; 264 | } 265 | 266 | /* mmap() library and look for symbol by prefix */ 267 | static char *symbol_version(const char *path) 268 | { 269 | struct stat st; 270 | int fd; 271 | 272 | /* check for compatibility (OS/API, bitness, etc.) */ 273 | void *handle = load_lib_new_namespace(path); 274 | dlclose(handle); 275 | 276 | /* open file */ 277 | if ((fd = open(path, O_RDONLY)) < 0) { 278 | err(1, "failed to open() file for reading: %s", path); 279 | } 280 | 281 | if (fstat(fd, &st) < 0) { 282 | err(1, "fstat() failed on file: %s", path); 283 | } 284 | 285 | /* mmap() library */ 286 | uint8_t *addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); 287 | 288 | if (addr == MAP_FAILED) { 289 | err(1, "mmap() failed: %s", path); 290 | } 291 | 292 | /* look for symbol */ 293 | char *symbol = find_symbol(path, st.st_size, addr); 294 | 295 | if (symbol) { 296 | DEBUG_PRINT("symbol %s found in: %s", symbol, path); 297 | } 298 | 299 | /* free resources */ 300 | if (munmap(addr, st.st_size) == -1) { 301 | warn("%s", "munmap() returned with an error"); 302 | } 303 | 304 | close(fd); 305 | 306 | return symbol; 307 | } 308 | 309 | /* compare symbol versions and return true 310 | * if we should use the bundled library */ 311 | static bool use_bundled_library(const char *dir, int flag) 312 | { 313 | bool rv = false; 314 | 315 | assert(flag == STDCXX || flag == LIBGCC); 316 | idx = flag; 317 | 318 | char *lib_bundle = malloc(strlen(dir) + subdir_len[idx] + libname_len[idx] + 3); 319 | sprintf(lib_bundle, "%s/%s/%s", dir, subdir[idx], libname[idx]); 320 | 321 | /* check if bundled file exists */ 322 | if (access(lib_bundle, F_OK) == 0) { 323 | /* get symbols */ 324 | char *sym_bundle = symbol_version(lib_bundle); 325 | char *lib_sys = get_system_library_path(); 326 | char *sym_sys = symbol_version(lib_sys); 327 | 328 | /* compare symbols */ 329 | if (sym_bundle && sym_sys && strverscmp(sym_bundle, sym_sys) > 0) { 330 | rv = true; 331 | } 332 | 333 | free(lib_sys); 334 | free(sym_sys); 335 | free(sym_bundle); 336 | } else { 337 | DEBUG_PRINT("no access or file does not exist: %s", lib_bundle); 338 | } 339 | 340 | DEBUG_PRINT("use %s %s library", rv ? "BUNDLED" : "SYSTEM", libname[idx]); 341 | free(lib_bundle); 342 | 343 | return rv; 344 | } 345 | 346 | /* get full dirname of executable */ 347 | static char *get_exe_dir() 348 | { 349 | char *self = realpath("/proc/self/exe", NULL); 350 | if (!self) err(1, "%s", "realpath() failed to resolve /proc/self/exe"); 351 | 352 | /* modifies "self" */ 353 | char *pdirname = dirname(self); 354 | 355 | if (pdirname[0] != '/' || pdirname != self) { 356 | errx(1, "dirname() returned an unexpected result: %s", pdirname); 357 | } 358 | 359 | DEBUG_PRINT("exe directory found at: %s", self); 360 | 361 | return self; 362 | } 363 | 364 | /* compare symbol versions of bundled and system libraries */ 365 | static void compare_library_symbols() 366 | { 367 | char *dir = get_exe_dir(); 368 | bool gcc = use_bundled_library(dir, LIBGCC); 369 | bool cxx = use_bundled_library(dir, STDCXX); 370 | 371 | /* FIRST add libgcc to search path, THEN libstdc++ */ 372 | if (gcc) printf("%s/gcc", dir); 373 | if (gcc && cxx) putchar(':'); 374 | if (cxx) printf("%s/cxx", dir); 375 | if (gcc || cxx) putchar('\n'); 376 | 377 | free(dir); 378 | } 379 | 380 | int main(int argc, char **argv) 381 | { 382 | const char *usage = 383 | "usage: %s [--copy|--help]\n" 384 | "\n" 385 | "Set environment variable CHECKRT_DEBUG to enable extra verbose output.\n" 386 | "Set CHECKRT_DEBUG=FULL to enable full verbosity.\n"; 387 | 388 | char *env = getenv("CHECKRT_DEBUG"); 389 | 390 | if (env) { 391 | if (strcasecmp(env, "full") == 0) { 392 | full_debug_mode = true; 393 | } 394 | debug_mode = true; 395 | } 396 | 397 | if (argc < 2) { 398 | compare_library_symbols(); 399 | return 0; 400 | } 401 | 402 | if (argc == 2 && strcmp(argv[1], "--copy") == 0) { 403 | /* copy system libraries next to executable */ 404 | char *dir = get_exe_dir(); 405 | copy_lib(dir, LIBGCC); 406 | copy_lib(dir, STDCXX); 407 | free(dir); 408 | return 0; 409 | } 410 | 411 | if (argc == 2 && strcmp(argv[1], "--help") == 0) { 412 | fprintf(stderr, usage, argv[0]); 413 | return 0; 414 | } 415 | 416 | fprintf(stderr, "%s\n", "error: unknown argument(s) given"); 417 | fprintf(stderr, usage, argv[0]); 418 | 419 | return 1; 420 | } 421 | -------------------------------------------------------------------------------- /example/Makefile: -------------------------------------------------------------------------------- 1 | APPIMAGE=example-1-$(shell uname -m).AppImage 2 | 3 | all: $(APPIMAGE) 4 | 5 | clean: 6 | -rm -f $(APPIMAGE) example linuxdeploy-plugin-checkrt.sh 7 | -rm -rf appdir 8 | 9 | distclean: clean 10 | -rm -f linuxdeploy-x86_64.AppImage 11 | 12 | $(APPIMAGE): 13 | ./build.sh 14 | 15 | -------------------------------------------------------------------------------- /example/README.md: -------------------------------------------------------------------------------- 1 | This Makefile will build an example AppImage for testing purpose. 2 | First you need to build a version of GCC that is newer than the default one 3 | on your system and install it to a custom prefix, let's say `$HOME/gcc`. 4 | 5 | Then run `make` with the `GCC_PREFIX` variable set to that path: 6 | ``` sh 7 | GCC_PREFIX="$HOME/gcc" make 8 | ``` 9 | 10 | Now run `CHECKRT_DEBUG=1 ./example-1-x86_64.AppImage`. 11 | The output should look similar to this: 12 | ``` 13 | CHECKRT>> libstdc++.so.6 system = 3004028 14 | CHECKRT>> libstdc++.so.6 bundle = 3004031 15 | CHECKRT>> libgcc_s.so.1 system = 7000000 16 | CHECKRT>> libgcc_s.so.1 bundle = 13000000 17 | CHECKRT>> LD_LIBRARY_PATH=/tmp/.mount_examplZGsWQg/apprun-hooks/checkrt/gcc:/tmp/.mount_examplZGsWQg/apprun-hooks/checkrt/cxx: 18 | CHECKRT>> LD_PRELOAD=/tmp/.mount_examplZGsWQg/apprun-hooks/checkrt/exec.so: 19 | hello world 20 | ``` 21 | You can see that the bundled libraries are newer versions than on the system 22 | and have therefor been prepended to LD_LIBRARY_PATH. 23 | 24 | If the library versions are equal to or less than on your system the output 25 | should look like this: 26 | ``` 27 | CHECKRT>> libstdc++.so.6 system = 3004031 28 | CHECKRT>> libstdc++.so.6 bundle = 3004031 29 | CHECKRT>> libgcc_s.so.1 system = 13000000 30 | CHECKRT>> libgcc_s.so.1 bundle = 13000000 31 | CHECKRT>> LD_LIBRARY_PATH= 32 | CHECKRT>> LD_PRELOAD=/tmp/.mount_examplEwjwfp/apprun-hooks/checkrt/exec.so: 33 | hello world 34 | ``` 35 | -------------------------------------------------------------------------------- /example/build.sh: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | if [ -z "$GCC_PREFIX" ]; then 4 | echo "Environment variable GCC_PREFIX is empty." 5 | echo "GCC_PREFIX has to be the path to a custom installation of GCC." 6 | echo "" 7 | exit 1 8 | fi 9 | 10 | set -e 11 | set -x 12 | 13 | wget -c "https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage" 14 | cp -f ../linuxdeploy-plugin-checkrt.sh . 15 | chmod a+x linuxdeploy-x86_64.AppImage linuxdeploy-plugin-checkrt.sh 16 | 17 | "$GCC_PREFIX/bin/g++" -O2 example.cpp -o example -s 18 | 19 | export LD_LIBRARY_PATH="$GCC_PREFIX/lib64:$GCC_PREFIX/lib:$LD_LIBRARY_PATH" 20 | VERSION=1 ./linuxdeploy-x86_64.AppImage --appdir=appdir -pcheckrt -oappimage -eexample -iexample.png -dexample.desktop 21 | -------------------------------------------------------------------------------- /example/example.cpp: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() 4 | { 5 | std::cout << "hello world" << std::endl; 6 | return 0; 7 | } 8 | -------------------------------------------------------------------------------- /example/example.desktop: -------------------------------------------------------------------------------- 1 | [Desktop Entry] 2 | Version=1.0 3 | Type=Application 4 | Terminal=false 5 | StartupNotify=false 6 | Name=example 7 | Exec=example 8 | Icon=example 9 | Categories=Development; 10 | -------------------------------------------------------------------------------- /example/example.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/darealshinji/linuxdeploy-plugin-checkrt/8d6f357fc37c604dfed7e6bc9738591443c6c945/example/example.png -------------------------------------------------------------------------------- /exec.c: -------------------------------------------------------------------------------- 1 | /* Copyright (c) 2018 Pablo Marcos Oltra 2 | * 3 | * Permission is hereby granted, free of charge, to any person obtaining a copy 4 | * of this software and associated documentation files (the "Software"), to deal 5 | * in the Software without restriction, including without limitation the rights 6 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 7 | * copies of the Software, and to permit persons to whom the Software is 8 | * furnished to do so, subject to the following conditions: 9 | * 10 | * The above copyright notice and this permission notice shall be included in all 11 | * copies or substantial portions of the Software. 12 | * 13 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 14 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 16 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 17 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 18 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 19 | * SOFTWARE. 20 | */ 21 | /* 22 | * This exec.so library is intended to restore the environment of the AppImage's 23 | * parent process. This is done to avoid library clashing of bundled libraries 24 | * with external processes, e.g when running the web browser. 25 | * 26 | * The intended usage is as follows: 27 | * 28 | * 1. This library is injected to the dynamic loader through LD_PRELOAD 29 | * automatically in AppRun **only** if `exec.so` exists. 30 | * 31 | * 2. This library will intercept calls to new processes and will detect whether 32 | * those calls are for binaries within the AppImage bundle or external ones. 33 | * 34 | * 3. In case it's an internal process, it will not change anything. 35 | * In case it's an external process, it will restore the environment of 36 | * the AppImage parent by reading `/proc/[pid]/environ`. 37 | * This is the conservative approach taken. 38 | */ 39 | #ifndef _GNU_SOURCE 40 | #define _GNU_SOURCE 41 | #endif 42 | #include 43 | #include 44 | #include 45 | #include 46 | #include /* MIN() */ 47 | #include 48 | 49 | 50 | typedef int (*execve_func_t)(const char *filename, char *const argv[], char *const envp[]); 51 | 52 | #define VISIBLE __attribute__ ((visibility ("default"))) 53 | 54 | #if !defined(DEBUG) && (defined(EXEC_TEST) || defined(ENV_TEST)) 55 | #define DEBUG 1 56 | #endif 57 | 58 | #ifdef DEBUG 59 | #include 60 | #define DEBUG_PRINT(...) \ 61 | if (getenv("APPIMAGE_EXEC_DEBUG")) { \ 62 | printf("APPIMAGE_EXEC>> " __VA_ARGS__); \ 63 | } 64 | #else 65 | #define DEBUG_PRINT(...) /**/ 66 | #endif 67 | 68 | 69 | static void env_free(char* const *env) 70 | { 71 | size_t len = 0; 72 | while (env[len] != 0) { 73 | free(env[len]); 74 | len++; 75 | } 76 | free((char**)env); 77 | } 78 | 79 | static size_t get_number_of_variables(FILE *file, char **buffer, size_t *len) 80 | { 81 | size_t number = 0; 82 | 83 | if (getline(buffer, len, file) < 0) 84 | return -1; 85 | 86 | char *ptr = *buffer; 87 | while (ptr < *buffer + *len) { 88 | size_t var_len = strlen(ptr); 89 | ptr += var_len + 1; 90 | if (var_len == 0) 91 | break; 92 | number++; 93 | } 94 | 95 | return number != 0 ? (ssize_t)number : -1; 96 | } 97 | 98 | static char* const* env_from_buffer(FILE *file) 99 | { 100 | char *buffer = NULL; 101 | size_t len = 0; 102 | size_t num_vars = get_number_of_variables(file, &buffer, &len); 103 | char** env = calloc(num_vars + 1, sizeof(char*)); 104 | 105 | size_t n = 0; 106 | char *ptr = buffer; 107 | while (ptr < buffer + len && n < num_vars) { 108 | size_t var_len = strlen(ptr); 109 | if (var_len == 0) 110 | break; 111 | 112 | env[n] = calloc(sizeof(char*), var_len + 1); 113 | strncpy(env[n], ptr, var_len + 1); 114 | DEBUG_PRINT("\tenv var copied: %s\n", env[n]); 115 | ptr += var_len + 1; 116 | n++; 117 | } 118 | free(buffer); 119 | 120 | return env; 121 | } 122 | 123 | static char* const* read_env_from_process(pid_t pid) 124 | { 125 | char buffer[256] = {0}; 126 | 127 | snprintf(buffer, sizeof(buffer), "/proc/%d/environ", pid); 128 | DEBUG_PRINT("Reading env from parent process: %s\n", buffer); 129 | FILE *env_file = fopen(buffer, "r"); 130 | if (!env_file) { 131 | DEBUG_PRINT("Error reading file: %s (%s)\n", buffer, strerror(errno)); 132 | return NULL; 133 | } 134 | 135 | char* const* env = env_from_buffer(env_file); 136 | fclose(env_file); 137 | 138 | return env; 139 | } 140 | 141 | static int is_external_process(const char *filename) 142 | { 143 | const char *appdir = getenv("APPDIR"); 144 | if (!appdir) 145 | return 0; 146 | DEBUG_PRINT("APPDIR = %s\n", appdir); 147 | 148 | return strncmp(filename, appdir, MIN(strlen(filename), strlen(appdir))); 149 | } 150 | 151 | static int exec_common(execve_func_t function, const char *filename, char* const argv[], char* const envp[]) 152 | { 153 | // Try to get the canonical path in case it's a relative path or symbolic link. 154 | char *fullpath = canonicalize_file_name(filename); 155 | DEBUG_PRINT("filename %s, fullpath %s\n", filename, fullpath); 156 | 157 | char* const *env = envp; 158 | if (is_external_process(fullpath)) { 159 | DEBUG_PRINT("External process detected. Restoring env vars from parent %d\n", getppid()); 160 | env = read_env_from_process(getppid()); 161 | if (!env) { 162 | env = envp; 163 | DEBUG_PRINT("Error restoring env vars from parent\n"); 164 | } 165 | } 166 | int ret = function(filename, argv, env); 167 | 168 | if (fullpath != filename) 169 | free(fullpath); 170 | 171 | if (env != envp) 172 | env_free(env); 173 | 174 | return ret; 175 | } 176 | 177 | VISIBLE int execve(const char *filename, char *const argv[], char *const envp[]) 178 | { 179 | DEBUG_PRINT("execve call hijacked: %s\n", filename); 180 | execve_func_t execve_orig = dlsym(RTLD_NEXT, "execve"); 181 | if (!execve_orig) { 182 | DEBUG_PRINT("Error getting execve original symbol: %s\n", strerror(errno)); 183 | } 184 | 185 | return exec_common(execve_orig, filename, argv, envp); 186 | } 187 | 188 | VISIBLE int execv(const char *filename, char *const argv[]) { 189 | DEBUG_PRINT("execv call hijacked: %s\n", filename); 190 | return execve(filename, argv, environ); 191 | } 192 | 193 | VISIBLE int execvpe(const char *filename, char *const argv[], char *const envp[]) 194 | { 195 | DEBUG_PRINT("execvpe call hijacked: %s\n", filename); 196 | execve_func_t execve_orig = dlsym(RTLD_NEXT, "execvpe"); 197 | if (!execve_orig) { 198 | DEBUG_PRINT("Error getting execvpe original symbol: %s\n", strerror(errno)); 199 | } 200 | 201 | return exec_common(execve_orig, filename, argv, envp); 202 | } 203 | 204 | VISIBLE int execvp(const char *filename, char *const argv[]) { 205 | DEBUG_PRINT("execvp call hijacked: %s\n", filename); 206 | return execvpe(filename, argv, environ); 207 | } 208 | 209 | #ifdef EXEC_TEST 210 | int main(int argc, char *argv[]) { 211 | putenv("APPIMAGE_EXEC_DEBUG=1"); 212 | puts("EXEC TEST"); 213 | execv("/bin/true", argv); 214 | return 0; 215 | } 216 | #elif defined(ENV_TEST) 217 | int main() { 218 | putenv("APPIMAGE_EXEC_DEBUG=1"); 219 | puts("ENV TEST"); 220 | read_env_from_process(getppid()); 221 | return 0; 222 | } 223 | #endif 224 | -------------------------------------------------------------------------------- /generate.sh: -------------------------------------------------------------------------------- 1 | #! /usr/bin/env bash 2 | set -e 3 | 4 | script="linuxdeploy-plugin-checkrt.sh" 5 | 6 | files="checkrt.c 7 | COPYING 8 | COPYING3 9 | COPYING.libgcc 10 | COPYING.libstdc++ 11 | COPYING.RUNTIME 12 | exec.c" 13 | 14 | rm -f $script 15 | 16 | # script header 17 | cat << EOL > $script 18 | #! /usr/bin/env bash 19 | # This script was automatically generated! 20 | 21 | set -e 22 | 23 | EOL 24 | 25 | # files 26 | echo "save_files() {" >> $script 27 | 28 | for f in $files ; do 29 | echo " cat > "$f" << \__EOF__" >> $script 30 | cat $f >> $script 31 | echo -e "\n__EOF__\n" >> $script 32 | done 33 | 34 | cat << EOL >> $script 35 | } 36 | # save_files() end 37 | 38 | EOL 39 | 40 | # main part 41 | cat template.sh >> $script 42 | chmod a+x $script 43 | -------------------------------------------------------------------------------- /template.sh: -------------------------------------------------------------------------------- 1 | show_usage() { 2 | echo "Usage: $0 --appdir " 3 | echo 4 | } 5 | 6 | while [ "$1" != "" ]; do 7 | case "$1" in 8 | --plugin-api-version) 9 | echo "0" 10 | exit 0 11 | ;; 12 | --appdir) 13 | APPDIR="$2" 14 | shift 15 | shift 16 | ;; 17 | --help) 18 | show_usage 19 | exit 0 20 | ;; 21 | *) 22 | echo "Invalid argument: $1" 23 | echo 24 | show_usage 25 | exit 1 26 | ;; 27 | esac 28 | done 29 | 30 | if [ "$APPDIR" == "" ]; then 31 | show_usage 32 | exit 1 33 | fi 34 | 35 | APPDIR="$(realpath "$APPDIR")" 36 | 37 | echo "Installing AppRun hook 'checkrt'" 38 | mkdir -p "$APPDIR/apprun-hooks" 39 | 40 | cat > "$APPDIR/apprun-hooks/linuxdeploy-plugin-checkrt.sh" << \EOF 41 | #! /usr/bin/env bash 42 | 43 | if [ -z "$APPDIR" ]; then 44 | APPDIR="$(dirname "$(realpath "$0")")" 45 | fi 46 | 47 | if [ -x "$APPDIR/checkrt/checkrt" ]; then 48 | CHECKRT_LIBS="$($APPDIR/checkrt/checkrt)" 49 | 50 | # prepend to LD_LIBRARY_PATH 51 | if [ -n "$CHECKRT_LIBS" ]; then 52 | export LD_LIBRARY_PATH="${CHECKRT_LIBS}:${LD_LIBRARY_PATH}" 53 | fi 54 | fi 55 | 56 | # check for exec.so 57 | if [ -f "$APPDIR/checkrt/exec.so" ]; then 58 | export LD_PRELOAD="$APPDIR/checkrt/exec.so:${LD_PRELOAD}" 59 | fi 60 | 61 | # debugging 62 | if [ -n "$CHECKRT_DEBUG" ]; then 63 | echo "CHECKRT>> LD_LIBRARY_PATH=$LD_LIBRARY_PATH" 64 | echo "CHECKRT>> LD_PRELOAD=$LD_PRELOAD" 65 | fi 66 | EOF 67 | 68 | mkdir -p "$APPDIR/checkrt" 69 | cd "$APPDIR/checkrt" 70 | 71 | save_files 72 | 73 | LDFLAGS="-Wl,--as-needed -static-libgcc -ldl -s" 74 | CFLAGS="-O2 -DNDEBUG" 75 | 76 | echo "Compiling checkrt" 77 | cc $CFLAGS checkrt.c -o checkrt $LDFLAGS 78 | 79 | echo "Compiling exec.so" 80 | cc $CFLAGS -shared -fPIC exec.c -o exec.so $LDFLAGS 81 | rm checkrt.c exec.c 82 | 83 | ./checkrt --copy 84 | 85 | cd "$APPDIR" 86 | --------------------------------------------------------------------------------