diff --git a/build_AppImage.sh b/build_AppImage.sh index cea18b12..9efca9c0 100755 --- a/build_AppImage.sh +++ b/build_AppImage.sh @@ -34,6 +34,6 @@ mkdir -p ./AppDir/usr/plugins/QuardCRT if [ -d "./prebuilt_plugins" ]; then cp ./prebuilt_plugins/*.so ./AppDir/usr/plugins/QuardCRT/ fi -ARCH=x86_64 ./tools/linuxdeploy-x86_64.AppImage --executable=./build_release/out/quardCRT --appdir=./AppDir --icon-file=./icons/ico.svg --desktop-file=./AppDirRes/quardCRT.desktop --plugin qt --plugin quardcrt --output appimage +ARCH=x86_64 ./tools/linuxdeploy-x86_64.AppImage --executable=./build_release/out/quardCRT --appdir=./AppDir --icon-file=./icons/ico.svg --desktop-file=./AppDirRes/quardCRT.desktop --plugin qt --plugin checkrt --plugin quardcrt --output appimage mkdir AppImageOut cp ./quardCRT-*.AppImage ./AppImageOut/quardCRT_Linux_"$QUARDCRT_VERSION"_x86_64.AppImage diff --git a/build_deb.sh b/build_deb.sh index 27e1fbd7..fe2dd18c 100755 --- a/build_deb.sh +++ b/build_deb.sh @@ -30,7 +30,7 @@ rm -f ./dpkg/quardCRT_Linux_"$QUARDCRT_VERSION"_x86_64.deb cp -r ./dpkg/quardCRT ./dpkg/quardCRT_Linux_"$QUARDCRT_VERSION"_x86_64 # 使用linuxdeployqt拷贝依赖so库到打包目录 export QMAKE=$QT_DIR/bin/qmake -./tools/linuxdeploy-x86_64.AppImage --executable=./build_release/out/quardCRT --appdir=./dpkg/quardCRT_Linux_"$QUARDCRT_VERSION"_x86_64/opt --plugin=qt +./tools/linuxdeploy-x86_64.AppImage --executable=./build_release/out/quardCRT --appdir=./dpkg/quardCRT_Linux_"$QUARDCRT_VERSION"_x86_64/opt --plugin qt --plugin checkrt rm -rf ./dpkg/quardCRT_Linux_"$QUARDCRT_VERSION"_x86_64/opt/apprun-hooks mv ./dpkg/quardCRT_Linux_"$QUARDCRT_VERSION"_x86_64/opt/usr ./dpkg/quardCRT_Linux_"$QUARDCRT_VERSION"_x86_64/opt/quardCRT mv ./dpkg/quardCRT_Linux_"$QUARDCRT_VERSION"_x86_64/opt/quardCRT/bin/quardCRT ./dpkg/quardCRT_Linux_"$QUARDCRT_VERSION"_x86_64/opt/quardCRT/quardCRT diff --git a/tools/linuxdeploy-plugin-checkrt.sh b/tools/linuxdeploy-plugin-checkrt.sh new file mode 100755 index 00000000..9ce65052 --- /dev/null +++ b/tools/linuxdeploy-plugin-checkrt.sh @@ -0,0 +1,1549 @@ +#! /usr/bin/env bash +# This script was automatically generated! + +set -e + +save_files() { + cat > checkrt.c << \__EOF__ +/* Copyright (c) 2022-2023 + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in all + * copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#ifndef _GNU_SOURCE +#define _GNU_SOURCE +#endif +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +#if defined(_LP64) || defined(__LP64__) +typedef Elf64_Ehdr Elf_Ehdr; +typedef Elf64_Shdr Elf_Shdr; +typedef Elf64_Sym Elf_Sym; +#else +typedef Elf32_Ehdr Elf_Ehdr; +typedef Elf32_Shdr Elf_Shdr; +typedef Elf32_Sym Elf_Sym; +#endif + +typedef struct { + const char *filename; + int fd; + size_t size; + uint8_t *address; +} mmap_t; + + +#define FREE(x) \ + if (x) { free(x); } + +#ifdef NDEBUG +#define DEBUG_PRINT(MSG, ...) /**/ +#else +#define DEBUG_PRINT(MSG, ...) \ + if (getenv("CHECKRT_DEBUG")) { \ + fprintf(stderr, "[DEBUG] %s(): " MSG "\n", __func__, __VA_ARGS__); \ + } +#endif + + +/* retrieve full path of (system) library */ +char *get_libpath(const char *lib) +{ + /* not only do we get the full path but dlmopen() + * also does all the compatibility checks for us */ + + struct link_map *map = NULL; + + /* open in new namespace */ + void *handle = dlmopen(LM_ID_NEWLM, lib, RTLD_LAZY); + + if (!handle) { + char *p = dlerror(); + if (p) fprintf(stderr, "%s\n", p); + err(EXIT_FAILURE, "dlmopen() failed to load library: %s\n", lib); + } + + if (dlinfo(handle, RTLD_DI_LINKMAP, &map) == -1 || map->l_name[0] == 0) { + dlclose(handle); + err(EXIT_FAILURE, "dlinfo() could not retrieve information from library: %s\n", lib); + } + + char *path = strdup(map->l_name); + DEBUG_PRINT("%s resolved to: %s", lib, path); + + dlclose(handle); + + return path; +} + +/* copy library from system into directory next to binary */ +void copy_lib(const char *libname, const char *dirname1, const char *dirname2) +{ + /* find library */ + char *src = get_libpath(libname); + if (!src) err(EXIT_FAILURE, "cannot find %s in system", libname); + + printf("Copy library: %s\n", src); + + /* create target directory */ + char *target = malloc(strlen(dirname1) + strlen(dirname2) + strlen(libname) + 3); + sprintf(target, "%s/%s", dirname1, dirname2); + mkdir(target, 0775); + + /* open source file for reading */ + int fd_in = open(src, O_RDONLY); + if (fd_in < 0) err(EXIT_FAILURE, "cannot open file for reading: %s", src); + + /* open target file for writing */ + sprintf(target, "%s/%s/%s", dirname1, dirname2, libname); + int fd_out = open(target, O_WRONLY | O_CREAT | O_TRUNC, 0664); + if (fd_out < 0) err(EXIT_FAILURE, "cannot open file for writing: %s", target); + + /* copy file content */ + ssize_t nread; + uint8_t buf[512*1024]; + + while ((nread = read(fd_in, buf, sizeof(buf))) > 0) { + if (write(fd_out, buf, nread) != nread) { + err(EXIT_FAILURE, "error writing to file: %s", target); + } + } + + if (nread == -1) { + err(EXIT_FAILURE, "error reading from file: %s", src); + } + + /* free resources */ + close(fd_out); + close(fd_in); + FREE(src); + FREE(target); +} + +/* find symbol by prefix */ +char *find_symbol(mmap_t *mem, const char *sym_prefix) +{ + size_t tmp = 0; + + /* filesize check */ +#define CHECK_FSIZE(x) \ + if (x >= mem->size) { \ + fprintf(stderr, "%s\n", "offset exceeds filesize"); \ + return NULL; \ + } + + /* overflow + filesize check */ +#define CHECK_OVERFLOW(a, b) \ + if (__builtin_add_overflow(a, b, &tmp)) { \ + fprintf(stderr, "%s\n", "overflow detected"); \ + return NULL; \ + } \ + CHECK_FSIZE(tmp) + + + /* get string table */ + Elf_Ehdr *ehdr = (Elf_Ehdr *)mem->address; + + CHECK_OVERFLOW(ehdr->e_shoff, ehdr->e_shstrndx); + Elf_Shdr *shdr = (Elf_Shdr *)(mem->address + ehdr->e_shoff); + Elf_Shdr *strtab = shdr + ehdr->e_shstrndx; + size_t dynstr_off = 0; + + CHECK_FSIZE(strtab->sh_offset); + const char *data = (const char *)(mem->address + strtab->sh_offset); + + /* get .dynstr section */ + for (size_t i = 0; i < ehdr->e_shnum; i++) { + CHECK_OVERFLOW(strtab->sh_offset, shdr[i].sh_name); + + if (strcmp(data + shdr[i].sh_name, ".dynstr") == 0) { + dynstr_off = shdr[i].sh_offset; + break; + } + } + + if (dynstr_off == 0) return NULL; + CHECK_FSIZE(dynstr_off); + + const char *symbol = NULL; + const size_t pfxlen = strlen(sym_prefix); + data = (const char *)(mem->address + dynstr_off); + + /* look for section header type SHT_DYNSYM */ + for (size_t i = 0; i < ehdr->e_shnum; i++) { + if (shdr[i].sh_type != SHT_DYNSYM) { + continue; + } + + CHECK_FSIZE(shdr[i].sh_offset); + Elf_Sym *sym = (Elf_Sym *)(mem->address + shdr[i].sh_offset); + const size_t sh_sz = shdr[i].sh_size; + const size_t sh_esz = shdr[i].sh_entsize; + + /* do some extra checks to prevent floating-point exceptions + * or similar issues */ + if (sh_sz < sh_esz || sh_sz == 0 || sh_esz == 0) { + fprintf(stderr, "problematic math division [%ld/%ld] in section header found: %s\n", + sh_sz, sh_esz, mem->filename); + return NULL; + } + + const size_t num = sh_sz / sh_esz; + + /* parse symbols */ + for (size_t j = 0; j < num; j++) { + CHECK_OVERFLOW(dynstr_off, sym[j].st_name); + const char *name = data + sym[j].st_name; + + if (/* check symbol type */ + ELF64_ST_TYPE(sym[j].st_info) == STT_OBJECT && + ELF64_ST_BIND(sym[j].st_info) == STB_GLOBAL && + ELF64_ST_VISIBILITY(sym[j].st_other) == STV_DEFAULT && + /* compare with sym_prefix */ + strncmp(name, sym_prefix, pfxlen) == 0 && + isdigit(name[pfxlen]) && + strchr(name, '.') && + /* compare version strings */ + (!symbol || strverscmp(symbol, name) < 0)) + { + symbol = name; + //DEBUG_PRINT("symbol: %s", name); + } + } + } + + return symbol ? strdup(symbol) : NULL; +} + +/* mmap() library and look for symbol by prefix */ +char *symbol_version(const char *lib, const char *sym_prefix) +{ + struct stat st; + mmap_t mem; + mem.filename = lib; + + /* open file */ + if ((mem.fd = open(lib, O_RDONLY)) < 0) { + err(EXIT_FAILURE, "failed to open() file: %s\n", lib); + } + + /* fstat() path and check if it's a regular file (or a link to one) */ + if (fstat(mem.fd, &st) < 0) err(EXIT_FAILURE, "fstat() failed: %s\n", lib); + if (!S_ISREG(st.st_mode)) err(EXIT_FAILURE, "not a regular file: %s\n", lib); + + /* make sure file size is larger than the required ELF header size */ + mem.size = st.st_size; + + if (mem.size <= sizeof(Elf_Ehdr)) { + err(EXIT_FAILURE, "fstat() returned a too low file size: %s\n", lib); + } + + /* mmap() library */ + mem.address = mmap(NULL, mem.size, PROT_READ, MAP_PRIVATE, mem.fd, 0); + + if (mem.address == MAP_FAILED) { + err(EXIT_FAILURE, "mmap() failed: %s\n", lib); + } + + /* look for symbol */ + char *symbol = find_symbol(&mem, sym_prefix); + + if (symbol) { + DEBUG_PRINT("symbol %s found in: %s", symbol, lib); + } + + /* free resources */ + if (munmap(mem.address, mem.size) == -1) { + perror("munmap()"); + } + close(mem.fd); + + return symbol; +} + +/* compare symbol versions and return true + * if we should use the bundled library */ +bool use_bundled_library(const char *libname, const char *dirname1, const char *dirname2, const char *sym_prefix) +{ + bool rv = false; + char *lib_bundle = malloc(strlen(dirname1) + strlen(dirname2) + strlen(libname) + 3); + + sprintf(lib_bundle, "%s/%s/%s", dirname1, dirname2, libname); + + /* check if bundled file exists */ + if (access(lib_bundle, F_OK) == 0) { + /* get symbols */ + char *sym_bundle = symbol_version(lib_bundle, sym_prefix); + char *lib_sys = get_libpath(libname); + char *sym_sys = symbol_version(lib_sys, sym_prefix); + + /* compare symbols */ + if (sym_bundle && sym_sys && strverscmp(sym_bundle, sym_sys) > 0) { + rv = true; + } + + FREE(lib_sys); + FREE(sym_sys); + FREE(sym_bundle); + } else { + DEBUG_PRINT("no access or file does not exist: %s", lib_bundle); + } + + DEBUG_PRINT("use %s %s library", rv ? "BUNDLED" : "SYSTEM", libname); + FREE(lib_bundle); + + return rv; +} + +/* get full dirname of executable */ +char *get_exe_dir() +{ + char *self = realpath("/proc/self/exe", NULL); + if (!self) err(EXIT_FAILURE, "%s", "realpath() failed to resolve /proc/self/exe"); + + /* modifies "self" */ + char *pdirname = dirname(self); + + if (pdirname[0] != '/' || pdirname != self) { + err(EXIT_FAILURE, "dirname() returned an unexpected result: %s", pdirname); + } + + DEBUG_PRINT("exe directory found: %s", self); + + return self; +} + +/* compare symbol versions of bundled and system libraries */ +void compare_library_symbols() +{ + char *dir = get_exe_dir(); + bool gcc = use_bundled_library("libgcc_s.so.1", dir, "gcc", "GCC_"); + bool cxx = use_bundled_library("libstdc++.so.6", dir, "cxx", "GLIBCXX_"); + + /* FIRST add libgcc to search path, THEN libstdc++ */ + if (gcc) printf("%s/gcc", dir); + if (gcc && cxx) putchar(':'); + if (cxx) printf("%s/cxx", dir); + if (gcc || cxx) putchar('\n'); + + FREE(dir); +} + +/* copy system libraries next to executable */ +void copy_libraries() +{ + char *dir = get_exe_dir(); + copy_lib("libgcc_s.so.1", dir, "gcc"); + copy_lib("libstdc++.so.6", dir, "cxx"); + FREE(dir); +} + +int main(int argc, char **argv) +{ + const char *usage = + "usage: %s [--copy]\n" + "set environment variable CHECKRT_DEBUG to enable extra verbose output\n"; + + if (argc < 2) { + compare_library_symbols(); + return 0; + } + + if (argc == 2 && strcmp(argv[1], "--copy") == 0) { + copy_libraries(); + return 0; + } + + if (argc == 2 && strcmp(argv[1], "--help") == 0) { + fprintf(stderr, usage, argv[0]); + return 0; + } + + fprintf(stderr, "%s\n", "error: unknown argument(s) given"); + fprintf(stderr, usage, argv[0]); + + return 1; +} + +__EOF__ + + cat > COPYING << \__EOF__ +checkrt.c: 2022-2023 +exec.c: 2018 Pablo Marcos Oltra + +The MIT License + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. + + +__EOF__ + + cat > COPYING3 << \__EOF__ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. 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Interpretation of Sections 15 and 16. + + If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +an absolute waiver of all civil liability in connection with the +Program, unless a warranty or assumption of liability accompanies a +copy of the Program in return for a fee. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. + +__EOF__ + + cat > COPYING.libgcc << \__EOF__ +Copyright (C) 1989-2023 Free Software Foundation, Inc. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it under +the terms of the GNU General Public License as published by the Free +Software Foundation; either version 3, or (at your option) any later +version. + +GCC is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY; without even the implied warranty of MERCHANTABILITY or +FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +for more details. + +Under Section 7 of GPL version 3, you are granted additional +permissions described in the GCC Runtime Library Exception, version +3.1, as published by the Free Software Foundation. + +You should have received a copy of the GNU General Public License and +a copy of the GCC Runtime Library Exception along with this program; +see the files COPYING3 and COPYING.RUNTIME respectively. If not, see +. + + +__EOF__ + + cat > COPYING.libstdc++ << \__EOF__ +Copyright (C) 1997-2023 Free Software Foundation, Inc. + +This file is part of the GNU ISO C++ Library. This library is free +software; you can redistribute it and/or modify it under the +terms of the GNU General Public License as published by the +Free Software Foundation; either version 3, or (at your option) +any later version. + +This library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +Under Section 7 of GPL version 3, you are granted additional +permissions described in the GCC Runtime Library Exception, version +3.1, as published by the Free Software Foundation. + +You should have received a copy of the GNU General Public License and +a copy of the GCC Runtime Library Exception along with this program; +see the files COPYING3 and COPYING.RUNTIME respectively. If not, see +. + + +__EOF__ + + cat > COPYING.RUNTIME << \__EOF__ +GCC RUNTIME LIBRARY EXCEPTION + +Version 3.1, 31 March 2009 + +Copyright (C) 2009 Free Software Foundation, Inc. + +Everyone is permitted to copy and distribute verbatim copies of this +license document, but changing it is not allowed. + +This GCC Runtime Library Exception ("Exception") is an additional +permission under section 7 of the GNU General Public License, version +3 ("GPLv3"). It applies to a given file (the "Runtime Library") that +bears a notice placed by the copyright holder of the file stating that +the file is governed by GPLv3 along with this Exception. + +When you use GCC to compile a program, GCC may combine portions of +certain GCC header files and runtime libraries with the compiled +program. The purpose of this Exception is to allow compilation of +non-GPL (including proprietary) programs to use, in this way, the +header files and runtime libraries covered by this Exception. + +0. Definitions. + +A file is an "Independent Module" if it either requires the Runtime +Library for execution after a Compilation Process, or makes use of an +interface provided by the Runtime Library, but is not otherwise based +on the Runtime Library. + +"GCC" means a version of the GNU Compiler Collection, with or without +modifications, governed by version 3 (or a specified later version) of +the GNU General Public License (GPL) with the option of using any +subsequent versions published by the FSF. + +"GPL-compatible Software" is software whose conditions of propagation, +modification and use would permit combination with GCC in accord with +the license of GCC. + +"Target Code" refers to output from any compiler for a real or virtual +target processor architecture, in executable form or suitable for +input to an assembler, loader, linker and/or execution +phase. Notwithstanding that, Target Code does not include data in any +format that is used as a compiler intermediate representation, or used +for producing a compiler intermediate representation. + +The "Compilation Process" transforms code entirely represented in +non-intermediate languages designed for human-written code, and/or in +Java Virtual Machine byte code, into Target Code. Thus, for example, +use of source code generators and preprocessors need not be considered +part of the Compilation Process, since the Compilation Process can be +understood as starting with the output of the generators or +preprocessors. + +A Compilation Process is "Eligible" if it is done using GCC, alone or +with other GPL-compatible software, or if it is done without using any +work based on GCC. For example, using non-GPL-compatible Software to +optimize any GCC intermediate representations would not qualify as an +Eligible Compilation Process. + +1. Grant of Additional Permission. + +You have permission to propagate a work of Target Code formed by +combining the Runtime Library with Independent Modules, even if such +propagation would otherwise violate the terms of GPLv3, provided that +all Target Code was generated by Eligible Compilation Processes. You +may then convey such a combination under terms of your choice, +consistent with the licensing of the Independent Modules. + +2. No Weakening of GCC Copyleft. + +The availability of this Exception does not imply any general +presumption that third-party software is unaffected by the copyleft +requirements of the license of GCC. + + +__EOF__ + + cat > exec.c << \__EOF__ +/* Copyright (c) 2018 Pablo Marcos Oltra + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in all + * copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ +/* + * This exec.so library is intended to restore the environment of the AppImage's + * parent process. This is done to avoid library clashing of bundled libraries + * with external processes, e.g when running the web browser. + * + * The intended usage is as follows: + * + * 1. This library is injected to the dynamic loader through LD_PRELOAD + * automatically in AppRun **only** if `exec.so` exists. + * + * 2. This library will intercept calls to new processes and will detect whether + * those calls are for binaries within the AppImage bundle or external ones. + * + * 3. In case it's an internal process, it will not change anything. + * In case it's an external process, it will restore the environment of + * the AppImage parent by reading `/proc/[pid]/environ`. + * This is the conservative approach taken. + */ +#ifndef _GNU_SOURCE +#define _GNU_SOURCE +#endif +#include +#include +#include +#include +#include +#include /* MIN() */ +#include + + +typedef int (*execve_func_t)(const char *filename, char *const argv[], char *const envp[]); + +#define VISIBLE __attribute__ ((visibility ("default"))) + +#if !defined(DEBUG) && (defined(EXEC_TEST) || defined(ENV_TEST)) +#define DEBUG 1 +#endif + +#ifdef DEBUG +#define DEBUG_PRINT(...) \ + if (getenv("APPIMAGE_EXEC_DEBUG")) { \ + printf("APPIMAGE_EXEC>> " __VA_ARGS__); \ + } +#else +#define DEBUG_PRINT(...) /**/ +#endif + + +static void env_free(char* const *env) +{ + size_t len = 0; + while (env[len] != 0) { + free(env[len]); + len++; + } + free((char**)env); +} + +static size_t get_number_of_variables(FILE *file, char **buffer, size_t *len) +{ + size_t number = 0; + + if (getline(buffer, len, file) < 0) + return -1; + + char *ptr = *buffer; + while (ptr < *buffer + *len) { + size_t var_len = strlen(ptr); + ptr += var_len + 1; + if (var_len == 0) + break; + number++; + } + + return number != 0 ? (ssize_t)number : -1; +} + +static char* const* env_from_buffer(FILE *file) +{ + char *buffer = NULL; + size_t len = 0; + size_t num_vars = get_number_of_variables(file, &buffer, &len); + char** env = calloc(num_vars + 1, sizeof(char*)); + + size_t n = 0; + char *ptr = buffer; + while (ptr < buffer + len && n < num_vars) { + size_t var_len = strlen(ptr); + if (var_len == 0) + break; + + env[n] = calloc(sizeof(char*), var_len + 1); + strncpy(env[n], ptr, var_len + 1); + DEBUG_PRINT("\tenv var copied: %s\n", env[n]); + ptr += var_len + 1; + n++; + } + free(buffer); + + return env; +} + +static char* const* read_env_from_process(pid_t pid) +{ + char buffer[256] = {0}; + + snprintf(buffer, sizeof(buffer), "/proc/%d/environ", pid); + DEBUG_PRINT("Reading env from parent process: %s\n", buffer); + FILE *env_file = fopen(buffer, "r"); + if (!env_file) { + DEBUG_PRINT("Error reading file: %s (%s)\n", buffer, strerror(errno)); + return NULL; + } + + char* const* env = env_from_buffer(env_file); + fclose(env_file); + + return env; +} + +static int is_external_process(const char *filename) +{ + const char *appdir = getenv("APPDIR"); + if (!appdir) + return 0; + DEBUG_PRINT("APPDIR = %s\n", appdir); + + return strncmp(filename, appdir, MIN(strlen(filename), strlen(appdir))); +} + +static int exec_common(execve_func_t function, const char *filename, char* const argv[], char* const envp[]) +{ + // Try to get the canonical path in case it's a relative path or symbolic link. + char *fullpath = canonicalize_file_name(filename); + DEBUG_PRINT("filename %s, fullpath %s\n", filename, fullpath); + + char* const *env = envp; + if (is_external_process(fullpath)) { + DEBUG_PRINT("External process detected. Restoring env vars from parent %d\n", getppid()); + env = read_env_from_process(getppid()); + if (!env) { + env = envp; + DEBUG_PRINT("Error restoring env vars from parent\n"); + } + } + int ret = function(filename, argv, env); + + if (fullpath != filename) + free(fullpath); + + if (env != envp) + env_free(env); + + return ret; +} + +VISIBLE int execve(const char *filename, char *const argv[], char *const envp[]) +{ + DEBUG_PRINT("execve call hijacked: %s\n", filename); + execve_func_t execve_orig = dlsym(RTLD_NEXT, "execve"); + if (!execve_orig) { + DEBUG_PRINT("Error getting execve original symbol: %s\n", strerror(errno)); + } + + return exec_common(execve_orig, filename, argv, envp); +} + +VISIBLE int execv(const char *filename, char *const argv[]) { + DEBUG_PRINT("execv call hijacked: %s\n", filename); + return execve(filename, argv, environ); +} + +VISIBLE int execvpe(const char *filename, char *const argv[], char *const envp[]) +{ + DEBUG_PRINT("execvpe call hijacked: %s\n", filename); + execve_func_t execve_orig = dlsym(RTLD_NEXT, "execvpe"); + if (!execve_orig) { + DEBUG_PRINT("Error getting execvpe original symbol: %s\n", strerror(errno)); + } + + return exec_common(execve_orig, filename, argv, envp); +} + +VISIBLE int execvp(const char *filename, char *const argv[]) { + DEBUG_PRINT("execvp call hijacked: %s\n", filename); + return execvpe(filename, argv, environ); +} + +#ifdef EXEC_TEST +int main(int argc, char *argv[]) { + putenv("APPIMAGE_EXEC_DEBUG=1"); + puts("EXEC TEST"); + execv("/bin/true", argv); + return 0; +} +#elif defined(ENV_TEST) +int main() { + putenv("APPIMAGE_EXEC_DEBUG=1"); + puts("ENV TEST"); + read_env_from_process(getppid()); + return 0; +} +#endif + +__EOF__ + +} +# save_files() end + +show_usage() { + echo "Usage: $0 --appdir " + echo +} + +while [ "$1" != "" ]; do + case "$1" in + --plugin-api-version) + echo "0" + exit 0 + ;; + --appdir) + APPDIR="$2" + shift + shift + ;; + --help) + show_usage + exit 0 + ;; + *) + echo "Invalid argument: $1" + echo + show_usage + exit 1 + ;; + esac +done + +if [ "$APPDIR" == "" ]; then + show_usage + exit 1 +fi + +APPDIR="$(realpath "$APPDIR")" + +echo "Installing AppRun hook 'checkrt'" +mkdir -p "$APPDIR/apprun-hooks" + +cat > "$APPDIR/apprun-hooks/linuxdeploy-plugin-checkrt.sh" << \EOF +#! /usr/bin/env bash + +if [ -z "$APPDIR" ]; then + APPDIR="$(dirname "$(realpath "$0")")" +fi + +if [ -x "$APPDIR/checkrt/checkrt" ]; then + CHECKRT_LIBS="$($APPDIR/checkrt/checkrt)" + + # prepend to LD_LIBRARY_PATH + if [ -n "$CHECKRT_LIBS" ]; then + export LD_LIBRARY_PATH="${CHECKRT_LIBS}:${LD_LIBRARY_PATH}" + fi +fi + +# check for exec.so +if [ -f "$APPDIR/checkrt/exec.so" ]; then + export LD_PRELOAD="$APPDIR/checkrt/exec.so:${LD_PRELOAD}" +fi + +# debugging +if [ -n "$CHECKRT_DEBUG" ]; then + echo "CHECKRT>> LD_LIBRARY_PATH=$LD_LIBRARY_PATH" + echo "CHECKRT>> LD_PRELOAD=$LD_PRELOAD" +fi +EOF + +mkdir -p "$APPDIR/checkrt" +cd "$APPDIR/checkrt" + +save_files + +LDFLAGS="-Wl,--as-needed -static-libgcc -ldl -s" + +echo "Compiling checkrt" +cc -O2 checkrt.c -o checkrt $LDFLAGS + +echo "Compiling exec.so" +cc -shared -O2 -fPIC exec.c -o exec.so $LDFLAGS +rm checkrt.c exec.c + +./checkrt --copy + +cd "$APPDIR"