From 808668a0ca36bea2200393252302f5513a96cef8 Mon Sep 17 00:00:00 2001 From: darealshinji Date: Thu, 23 Jun 2022 17:36:53 +0200 Subject: [PATCH] checkrt tool rewritten --- .gitignore | 11 + AppRun | 24 ++ COPYING | 23 ++ README.md | 56 ++++ src/COPYING.RUNTIME | 73 +++++ src/COPYING.libgcc | 23 ++ src/COPYING.libstdc++ | 22 ++ src/COPYING3 | 674 ++++++++++++++++++++++++++++++++++++++++++ src/Makefile | 51 ++++ src/checkrt.c | 392 ++++++++++++++++++++++++ src/env.c | 134 +++++++++ src/env.h | 16 + src/exec.c | 134 +++++++++ 13 files changed, 1633 insertions(+) create mode 100644 .gitignore create mode 100755 AppRun create mode 100644 COPYING create mode 100644 README.md create mode 100644 src/COPYING.RUNTIME create mode 100644 src/COPYING.libgcc create mode 100644 src/COPYING.libstdc++ create mode 100644 src/COPYING3 create mode 100644 src/Makefile create mode 100644 src/checkrt.c create mode 100644 src/env.c create mode 100644 src/env.h create mode 100644 src/exec.c diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..2adf466 --- /dev/null +++ b/.gitignore @@ -0,0 +1,11 @@ +*.o +*.so +*.gz + +src/*_test +src/checkrt +src/res.h + +src/cxx/ +src/gcc/ + diff --git a/AppRun b/AppRun new file mode 100755 index 0000000..42dff21 --- /dev/null +++ b/AppRun @@ -0,0 +1,24 @@ +#!/bin/sh -e + +# add your command to execute here +exec= + +cd "$(dirname "$0")" +if [ "x$exec" = "x" ]; then + exec="$(sed -n 's|^Exec=||p' *.desktop | head -1)" +fi +if [ -x "./usr/optional/checkrt" ]; then + extra_libs="$(./usr/optional/checkrt)" +fi +if [ -n "$extra_libs" ]; then + export LD_LIBRARY_PATH="${extra_libs}${LD_LIBRARY_PATH}" + if [ -e "$PWD/usr/optional/exec.so" ]; then + export LD_PRELOAD="$PWD/usr/optional/exec.so:${LD_PRELOAD}" + fi +fi + +#echo ">>>>> $LD_LIBRARY_PATH" +#echo ">>>>> $LD_PRELOAD" + +./usr/bin/$exec "$*" +exit $? diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..712d3b9 --- /dev/null +++ b/COPYING @@ -0,0 +1,23 @@ +checkrt.c: 2022 +env.c 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. + diff --git a/README.md b/README.md new file mode 100644 index 0000000..da730fa --- /dev/null +++ b/README.md @@ -0,0 +1,56 @@ +# The problem + +Some projects require newer C++ standards to build them. To keep the glibc +dependency low you can build a newer GCC version on an older distro and use it +to compile the project. This project however will now require a newer version of +the `libstdc++.so.6` library than available on that distro. +Blindly bundling `libstdc++.so.6` however will in most cases break compatibility +with distros that have a newer library version installed into their system than +the bundled one. + +By the way, while this is primarily an issue with `libstdc++.so.6` in some cases +this might also occur with `libgcc_s.so.1`. That's because both libraries are +part of GCC. + + +# The solution + +You would have to know the library version of the host system and decide whether +to use a bundled library or not before the application is started. This is +exactly what the `checkrt` tool does. It will search for a bundled `libstdc++.so.6` +and `libgcc_s.so.1` library inside the AppImage or AppDir. If found it will +compare their internal versions with the ones found on the system (using dlopen()) +and prepend their paths to `LD_LIBRARY_PATH` if necessary. + + +# Usage + +Compile with `make -C src`. Inside your AppDir create the directory `usr/optional/` +and put the binary `checkrt` inside there. Execute `usr/optional/checkrt --copy-libraries` +to bundle your system's `libstdc++.so.6` and `libgcc_s.so.1` libraries. +Use the provided AppRun script or write/modify your own. `checkrt` will either +return a path that can be added to `LD_LIBRARY_PATH` or an empty string. +Error messages, help and verbosity will always be returned to stderr. + + +# exec.so + +You might also want to bundle `exec.so` inside `usr/optional/`. This library is +intended to restore the environment of the AppImage to its parent. 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 `usr/optional/exec.so` exists: + e.g `LD_PRELOAD=$APPDIR/usr/optional/exec.so My.AppImage` + +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. + diff --git a/src/COPYING.RUNTIME b/src/COPYING.RUNTIME new file mode 100644 index 0000000..e1b3c69 --- /dev/null +++ b/src/COPYING.RUNTIME @@ -0,0 +1,73 @@ +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. + diff --git a/src/COPYING.libgcc b/src/COPYING.libgcc new file mode 100644 index 0000000..621707b --- /dev/null +++ b/src/COPYING.libgcc @@ -0,0 +1,23 @@ +Copyright (C) 1989-2022 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 +. + diff --git a/src/COPYING.libstdc++ b/src/COPYING.libstdc++ new file mode 100644 index 0000000..420121d --- /dev/null +++ b/src/COPYING.libstdc++ @@ -0,0 +1,22 @@ +Copyright (C) 1997-2022 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 +. + diff --git a/src/COPYING3 b/src/COPYING3 new file mode 100644 index 0000000..94a9ed0 --- /dev/null +++ b/src/COPYING3 @@ -0,0 +1,674 @@ + 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. We, the Free Software Foundation, use the +GNU General Public License for most of our software; it applies also to +any other work released this way by its authors. You can apply it to +your programs, too. + + When we speak of free software, we are referring to freedom, not +price. Our General Public Licenses are designed to make sure that you +have the freedom to distribute copies of free software (and charge for +them if you wish), that you receive source code or can get it if you +want it, that you can change the software or use pieces of it in new +free programs, and that you know you can do these things. + + To protect your rights, we need to prevent others from denying you +these rights or asking you to surrender the rights. Therefore, you have +certain responsibilities if you distribute copies of the software, or if +you modify it: responsibilities to respect the freedom of others. + + For example, if you distribute copies of such a program, whether +gratis or for a fee, you must pass on to the recipients the same +freedoms that you received. You must make sure that they, too, receive +or can get the source code. And you must show them these terms so they +know their rights. + + Developers that use the GNU GPL protect your rights with two steps: +(1) assert copyright on the software, and (2) offer you this License +giving you legal permission to copy, distribute and/or modify it. + + For the developers' and authors' protection, the GPL clearly explains +that there is no warranty for this free software. For both users' and +authors' sake, the GPL requires that modified versions be marked as +changed, so that their problems will not be attributed erroneously to +authors of previous versions. + + Some devices are designed to deny users access to install or run +modified versions of the software inside them, although the manufacturer +can do so. This is fundamentally incompatible with the aim of +protecting users' freedom to change the software. The systematic +pattern of such abuse occurs in the area of products for individuals to +use, which is precisely where it is most unacceptable. Therefore, we +have designed this version of the GPL to prohibit the practice for those +products. If such problems arise substantially in other domains, we +stand ready to extend this provision to those domains in future versions +of the GPL, as needed to protect the freedom of users. + + Finally, every program is threatened constantly by software patents. +States should not allow patents to restrict development and use of +software on general-purpose computers, but in those that do, we wish to +avoid the special danger that patents applied to a free program could +make it effectively proprietary. To prevent this, the GPL assures that +patents cannot be used to render the program non-free. + + The precise terms and conditions for copying, distribution and +modification follow. + + TERMS AND CONDITIONS + + 0. Definitions. + + "This License" refers to version 3 of the GNU General Public License. + + "Copyright" also means copyright-like laws that apply to other kinds of +works, such as semiconductor masks. + + "The Program" refers to any copyrightable work licensed under this +License. Each licensee is addressed as "you". "Licensees" and +"recipients" may be individuals or organizations. + + To "modify" a work means to copy from or adapt all or part of the work +in a fashion requiring copyright permission, other than the making of an +exact copy. The resulting work is called a "modified version" of the +earlier work or a work "based on" the earlier work. + + A "covered work" means either the unmodified Program or a work based +on the Program. + + To "propagate" a work means to do anything with it that, without +permission, would make you directly or secondarily liable for +infringement under applicable copyright law, except executing it on a +computer or modifying a private copy. Propagation includes copying, +distribution (with or without modification), making available to the +public, and in some countries other activities as well. + + To "convey" a work means any kind of propagation that enables other +parties to make or receive copies. Mere interaction with a user through +a computer network, with no transfer of a copy, is not conveying. + + An interactive user interface displays "Appropriate Legal Notices" +to the extent that it includes a convenient and prominently visible +feature that (1) displays an appropriate copyright notice, and (2) +tells the user that there is no warranty for the work (except to the +extent that warranties are provided), that licensees may convey the +work under this License, and how to view a copy of this License. If +the interface presents a list of user commands or options, such as a +menu, a prominent item in the list meets this criterion. + + 1. Source Code. + + The "source code" for a work means the preferred form of the work +for making modifications to it. "Object code" means any non-source +form of a work. + + A "Standard Interface" means an interface that either is an official +standard defined by a recognized standards body, or, in the case of +interfaces specified for a particular programming language, one that +is widely used among developers working in that language. + + The "System Libraries" of an executable work include anything, other +than the work as a whole, that (a) is included in the normal form of +packaging a Major Component, but which is not part of that Major +Component, and (b) serves only to enable use of the work with that +Major Component, or to implement a Standard Interface for which an +implementation is available to the public in source code form. A +"Major Component", in this context, means a major essential component +(kernel, window system, and so on) of the specific operating system +(if any) on which the executable work runs, or a compiler used to +produce the work, or an object code interpreter used to run it. + + The "Corresponding Source" for a work in object code form means all +the source code needed to generate, install, and (for an executable +work) run the object code and to modify the work, including scripts to +control those activities. However, it does not include the work's +System Libraries, or general-purpose tools or generally available free +programs which are used unmodified in performing those activities but +which are not part of the work. For example, Corresponding Source +includes interface definition files associated with source files for +the work, and the source code for shared libraries and dynamically +linked subprograms that the work is specifically designed to require, +such as by intimate data communication or control flow between those +subprograms and other parts of the work. + + The Corresponding Source need not include anything that users +can regenerate automatically from other parts of the Corresponding +Source. + + The Corresponding Source for a work in source code form is that +same work. + + 2. Basic Permissions. + + All rights granted under this License are granted for the term of +copyright on the Program, and are irrevocable provided the stated +conditions are met. This License explicitly affirms your unlimited +permission to run the unmodified Program. The output from running a +covered work is covered by this License only if the output, given its +content, constitutes a covered work. This License acknowledges your +rights of fair use or other equivalent, as provided by copyright law. + + You may make, run and propagate covered works that you do not +convey, without conditions so long as your license otherwise remains +in force. You may convey covered works to others for the sole purpose +of having them make modifications exclusively for you, or provide you +with facilities for running those works, provided that you comply with +the terms of this License in conveying all material for which you do +not control copyright. Those thus making or running the covered works +for you must do so exclusively on your behalf, under your direction +and control, on terms that prohibit them from making any copies of +your copyrighted material outside their relationship with you. + + Conveying under any other circumstances is permitted solely under +the conditions stated below. Sublicensing is not allowed; section 10 +makes it unnecessary. + + 3. Protecting Users' Legal Rights From Anti-Circumvention Law. + + No covered work shall be deemed part of an effective technological +measure under any applicable law fulfilling obligations under article +11 of the WIPO copyright treaty adopted on 20 December 1996, or +similar laws prohibiting or restricting circumvention of such +measures. + + When you convey a covered work, you waive any legal power to forbid +circumvention of technological measures to the extent such circumvention +is effected by exercising rights under this License with respect to +the covered work, and you disclaim any intention to limit operation or +modification of the work as a means of enforcing, against the work's +users, your or third parties' legal rights to forbid circumvention of +technological measures. + + 4. Conveying Verbatim Copies. + + You may convey verbatim copies of the Program's source code as you +receive it, in any medium, provided that you conspicuously and +appropriately publish on each copy an appropriate copyright notice; +keep intact all notices stating that this License and any +non-permissive terms added in accord with section 7 apply to the code; +keep intact all notices of the absence of any warranty; and give all +recipients a copy of this License along with the Program. + + You may charge any price or no price for each copy that you convey, +and you may offer support or warranty protection for a fee. + + 5. Conveying Modified Source Versions. + + You may convey a work based on the Program, or the modifications to +produce it from the Program, in the form of source code under the +terms of section 4, provided that you also meet all of these conditions: + + a) The work must carry prominent notices stating that you modified + it, and giving a relevant date. + + b) The work must carry prominent notices stating that it is + released under this License and any conditions added under section + 7. This requirement modifies the requirement in section 4 to + "keep intact all notices". + + c) You must license the entire work, as a whole, under this + License to anyone who comes into possession of a copy. This + License will therefore apply, along with any applicable section 7 + additional terms, to the whole of the work, and all its parts, + regardless of how they are packaged. This License gives no + permission to license the work in any other way, but it does not + invalidate such permission if you have separately received it. + + d) If the work has interactive user interfaces, each must display + Appropriate Legal Notices; however, if the Program has interactive + interfaces that do not display Appropriate Legal Notices, your + work need not make them do so. + + A compilation of a covered work with other separate and independent +works, which are not by their nature extensions of the covered work, +and which are not combined with it such as to form a larger program, +in or on a volume of a storage or distribution medium, is called an +"aggregate" if the compilation and its resulting copyright are not +used to limit the access or legal rights of the compilation's users +beyond what the individual works permit. Inclusion of a covered work +in an aggregate does not cause this License to apply to the other +parts of the aggregate. + + 6. Conveying Non-Source Forms. + + You may convey a covered work in object code form under the terms +of sections 4 and 5, provided that you also convey the +machine-readable Corresponding Source under the terms of this License, +in one of these ways: + + a) Convey the object code in, or embodied in, a physical product + (including a physical distribution medium), accompanied by the + Corresponding Source fixed on a durable physical medium + customarily used for software interchange. + + b) Convey the object code in, or embodied in, a physical product + (including a physical distribution medium), accompanied by a + written offer, valid for at least three years and valid for as + long as you offer spare parts or customer support for that product + model, to give anyone who possesses the object code either (1) a + copy of the Corresponding Source for all the software in the + product that is covered by this License, on a durable physical + medium customarily used for software interchange, for a price no + more than your reasonable cost of physically performing this + conveying of source, or (2) access to copy the + Corresponding Source from a network server at no charge. + + c) Convey individual copies of the object code with a copy of the + written offer to provide the Corresponding Source. This + alternative is allowed only occasionally and noncommercially, and + only if you received the object code with such an offer, in accord + with subsection 6b. + + d) Convey the object code by offering access from a designated + place (gratis or for a charge), and offer equivalent access to the + Corresponding Source in the same way through the same place at no + further charge. You need not require recipients to copy the + Corresponding Source along with the object code. If the place to + copy the object code is a network server, the Corresponding Source + may be on a different server (operated by you or a third party) + that supports equivalent copying facilities, provided you maintain + clear directions next to the object code saying where to find the + Corresponding Source. Regardless of what server hosts the + Corresponding Source, you remain obligated to ensure that it is + available for as long as needed to satisfy these requirements. + + e) Convey the object code using peer-to-peer transmission, provided + you inform other peers where the object code and Corresponding + Source of the work are being offered to the general public at no + charge under subsection 6d. + + A separable portion of the object code, whose source code is excluded +from the Corresponding Source as a System Library, need not be +included in conveying the object code work. + + A "User Product" is either (1) a "consumer product", which means any +tangible personal property which is normally used for personal, family, +or household purposes, or (2) anything designed or sold for incorporation +into a dwelling. In determining whether a product is a consumer product, +doubtful cases shall be resolved in favor of coverage. For a particular +product received by a particular user, "normally used" refers to a +typical or common use of that class of product, regardless of the status +of the particular user or of the way in which the particular user +actually uses, or expects or is expected to use, the product. A product +is a consumer product regardless of whether the product has substantial +commercial, industrial or non-consumer uses, unless such uses represent +the only significant mode of use of the product. + + "Installation Information" for a User Product means any methods, +procedures, authorization keys, or other information required to install +and execute modified versions of a covered work in that User Product from +a modified version of its Corresponding Source. The information must +suffice to ensure that the continued functioning of the modified object +code is in no case prevented or interfered with solely because +modification has been made. + + If you convey an object code work under this section in, or with, or +specifically for use in, a User Product, and the conveying occurs as +part of a transaction in which the right of possession and use of the +User Product is transferred to the recipient in perpetuity or for a +fixed term (regardless of how the transaction is characterized), the +Corresponding Source conveyed under this section must be accompanied +by the Installation Information. But this requirement does not apply +if neither you nor any third party retains the ability to install +modified object code on the User Product (for example, the work has +been installed in ROM). + + The requirement to provide Installation Information does not include a +requirement to continue to provide support service, warranty, or updates +for a work that has been modified or installed by the recipient, or for +the User Product in which it has been modified or installed. Access to a +network may be denied when the modification itself materially and +adversely affects the operation of the network or violates the rules and +protocols for communication across the network. + + Corresponding Source conveyed, and Installation Information provided, +in accord with this section must be in a format that is publicly +documented (and with an implementation available to the public in +source code form), and must require no special password or key for +unpacking, reading or copying. + + 7. Additional Terms. + + "Additional permissions" are terms that supplement the terms of this +License by making exceptions from one or more of its conditions. +Additional permissions that are applicable to the entire Program shall +be treated as though they were included in this License, to the extent +that they are valid under applicable law. If additional permissions +apply only to part of the Program, that part may be used separately +under those permissions, but the entire Program remains governed by +this License without regard to the additional permissions. + + When you convey a copy of a covered work, you may at your option +remove any additional permissions from that copy, or from any part of +it. (Additional permissions may be written to require their own +removal in certain cases when you modify the work.) You may place +additional permissions on material, added by you to a covered work, +for which you have or can give appropriate copyright permission. + + Notwithstanding any other provision of this License, for material you +add to a covered work, you may (if authorized by the copyright holders of +that material) supplement the terms of this License with terms: + + a) Disclaiming warranty or limiting liability differently from the + terms of sections 15 and 16 of this License; or + + b) Requiring preservation of specified reasonable legal notices or + author attributions in that material or in the Appropriate Legal + Notices displayed by works containing it; or + + c) Prohibiting misrepresentation of the origin of that material, or + requiring that modified versions of such material be marked in + reasonable ways as different from the original version; or + + d) Limiting the use for publicity purposes of names of licensors or + authors of the material; or + + e) Declining to grant rights under trademark law for use of some + trade names, trademarks, or service marks; or + + f) Requiring indemnification of licensors and authors of that + material by anyone who conveys the material (or modified versions of + it) with contractual assumptions of liability to the recipient, for + any liability that these contractual assumptions directly impose on + those licensors and authors. + + All other non-permissive additional terms are considered "further +restrictions" within the meaning of section 10. If the Program as you +received it, or any part of it, contains a notice stating that it is +governed by this License along with a term that is a further +restriction, you may remove that term. If a license document contains +a further restriction but permits relicensing or conveying under this +License, you may add to a covered work material governed by the terms +of that license document, provided that the further restriction does +not survive such relicensing or conveying. + + If you add terms to a covered work in accord with this section, you +must place, in the relevant source files, a statement of the +additional terms that apply to those files, or a notice indicating +where to find the applicable terms. + + Additional terms, permissive or non-permissive, may be stated in the +form of a separately written license, or stated as exceptions; +the above requirements apply either way. + + 8. Termination. + + You may not propagate or modify a covered work except as expressly +provided under this License. Any attempt otherwise to propagate or +modify it is void, and will automatically terminate your rights under +this License (including any patent licenses granted under the third +paragraph of section 11). + + However, if you cease all violation of this License, then your +license from a particular copyright holder is reinstated (a) +provisionally, unless and until the copyright holder explicitly and +finally terminates your license, and (b) permanently, if the copyright +holder fails to notify you of the violation by some reasonable means +prior to 60 days after the cessation. + + Moreover, your license from a particular copyright holder is +reinstated permanently if the copyright holder notifies you of the +violation by some reasonable means, this is the first time you have +received notice of violation of this License (for any work) from that +copyright holder, and you cure the violation prior to 30 days after +your receipt of the notice. + + Termination of your rights under this section does not terminate the +licenses of parties who have received copies or rights from you under +this License. If your rights have been terminated and not permanently +reinstated, you do not qualify to receive new licenses for the same +material under section 10. + + 9. Acceptance Not Required for Having Copies. + + You are not required to accept this License in order to receive or +run a copy of the Program. Ancillary propagation of a covered work +occurring solely as a consequence of using peer-to-peer transmission +to receive a copy likewise does not require acceptance. However, +nothing other than this License grants you permission to propagate or +modify any covered work. These actions infringe copyright if you do +not accept this License. Therefore, by modifying or propagating a +covered work, you indicate your acceptance of this License to do so. + + 10. Automatic Licensing of Downstream Recipients. + + Each time you convey a covered work, the recipient automatically +receives a license from the original licensors, to run, modify and +propagate that work, subject to this License. You are not responsible +for enforcing compliance by third parties with this License. + + An "entity transaction" is a transaction transferring control of an +organization, or substantially all assets of one, or subdividing an +organization, or merging organizations. If propagation of a covered +work results from an entity transaction, each party to that +transaction who receives a copy of the work also receives whatever +licenses to the work the party's predecessor in interest had or could +give under the previous paragraph, plus a right to possession of the +Corresponding Source of the work from the predecessor in interest, if +the predecessor has it or can get it with reasonable efforts. + + You may not impose any further restrictions on the exercise of the +rights granted or affirmed under this License. For example, you may +not impose a license fee, royalty, or other charge for exercise of +rights granted under this License, and you may not initiate litigation +(including a cross-claim or counterclaim in a lawsuit) alleging that +any patent claim is infringed by making, using, selling, offering for +sale, or importing the Program or any portion of it. + + 11. Patents. + + A "contributor" is a copyright holder who authorizes use under this +License of the Program or a work on which the Program is based. The +work thus licensed is called the contributor's "contributor version". + + A contributor's "essential patent claims" are all patent claims +owned or controlled by the contributor, whether already acquired or +hereafter acquired, that would be infringed by some manner, permitted +by this License, of making, using, or selling its contributor version, +but do not include claims that would be infringed only as a +consequence of further modification of the contributor version. For +purposes of this definition, "control" includes the right to grant +patent sublicenses in a manner consistent with the requirements of +this License. + + Each contributor grants you a non-exclusive, worldwide, royalty-free +patent license under the contributor's essential patent claims, to +make, use, sell, offer for sale, import and otherwise run, modify and +propagate the contents of its contributor version. + + In the following three paragraphs, a "patent license" is any express +agreement or commitment, however denominated, not to enforce a patent +(such as an express permission to practice a patent or covenant not to +sue for patent infringement). To "grant" such a patent license to a +party means to make such an agreement or commitment not to enforce a +patent against the party. + + If you convey a covered work, knowingly relying on a patent license, +and the Corresponding Source of the work is not available for anyone +to copy, free of charge and under the terms of this License, through a +publicly available network server or other readily accessible means, +then you must either (1) cause the Corresponding Source to be so +available, or (2) arrange to deprive yourself of the benefit of the +patent license for this particular work, or (3) arrange, in a manner +consistent with the requirements of this License, to extend the patent +license to downstream recipients. "Knowingly relying" means you have +actual knowledge that, but for the patent license, your conveying the +covered work in a country, or your recipient's use of the covered work +in a country, would infringe one or more identifiable patents in that +country that you have reason to believe are valid. + + If, pursuant to or in connection with a single transaction or +arrangement, you convey, or propagate by procuring conveyance of, a +covered work, and grant a patent license to some of the parties +receiving the covered work authorizing them to use, propagate, modify +or convey a specific copy of the covered work, then the patent license +you grant is automatically extended to all recipients of the covered +work and works based on it. + + A patent license is "discriminatory" if it does not include within +the scope of its coverage, prohibits the exercise of, or is +conditioned on the non-exercise of one or more of the rights that are +specifically granted under this License. You may not convey a covered +work if you are a party to an arrangement with a third party that is +in the business of distributing software, under which you make payment +to the third party based on the extent of your activity of conveying +the work, and under which the third party grants, to any of the +parties who would receive the covered work from you, a discriminatory +patent license (a) in connection with copies of the covered work +conveyed by you (or copies made from those copies), or (b) primarily +for and in connection with specific products or compilations that +contain the covered work, unless you entered into that arrangement, +or that patent license was granted, prior to 28 March 2007. + + Nothing in this License shall be construed as excluding or limiting +any implied license or other defenses to infringement that may +otherwise be available to you under applicable patent law. + + 12. No Surrender of Others' Freedom. + + If conditions are imposed on you (whether by court order, agreement or +otherwise) that contradict the conditions of this License, they do not +excuse you from the conditions of this License. If you cannot convey a +covered work so as to satisfy simultaneously your obligations under this +License and any other pertinent obligations, then as a consequence you may +not convey it at all. For example, if you agree to terms that obligate you +to collect a royalty for further conveying from those to whom you convey +the Program, the only way you could satisfy both those terms and this +License would be to refrain entirely from conveying the Program. + + 13. Use with the GNU Affero General Public License. + + Notwithstanding any other provision of this License, you have +permission to link or combine any covered work with a work licensed +under version 3 of the GNU Affero General Public License into a single +combined work, and to convey the resulting work. The terms of this +License will continue to apply to the part which is the covered work, +but the special requirements of the GNU Affero General Public License, +section 13, concerning interaction through a network will apply to the +combination as such. + + 14. Revised Versions of this License. + + The Free Software Foundation may publish revised and/or new versions of +the GNU General Public License from time to time. Such new versions will +be similar in spirit to the present version, but may differ in detail to +address new problems or concerns. + + Each version is given a distinguishing version number. If the +Program specifies that a certain numbered version of the GNU General +Public License "or any later version" applies to it, you have the +option of following the terms and conditions either of that numbered +version or of any later version published by the Free Software +Foundation. If the Program does not specify a version number of the +GNU General Public License, you may choose any version ever published +by the Free Software Foundation. + + If the Program specifies that a proxy can decide which future +versions of the GNU General Public License can be used, that proxy's +public statement of acceptance of a version permanently authorizes you +to choose that version for the Program. + + Later license versions may give you additional or different +permissions. However, no additional obligations are imposed on any +author or copyright holder as a result of your choosing to follow a +later version. + + 15. Disclaimer of Warranty. + + THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY +APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT +HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY +OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, +THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM +IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF +ALL NECESSARY SERVICING, REPAIR OR CORRECTION. + + 16. Limitation of Liability. + + IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS +THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY +GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE +USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF +DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD +PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), +EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF +SUCH DAMAGES. + + 17. 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 +. diff --git a/src/Makefile b/src/Makefile new file mode 100644 index 0000000..af67e47 --- /dev/null +++ b/src/Makefile @@ -0,0 +1,51 @@ +BIN = checkrt +LIB = exec.so +EXEC_TEST = exec_test +ENV_TEST = env_test +CHECKRT_TEST = checkrt_test + +CFLAGS := -Wall -O3 +LDFLAGS := -s + + +all: $(BIN) $(LIB) + +clean: + -rm -f *.o *.gz res.h $(BIN) $(LIB) $(EXEC_TEST) $(ENV_TEST) $(CHECKRT_TEST) + +distclean: clean + -rm -rf cxx gcc + +$(BIN): checkrt.o + $(CC) -o $@ $^ $(LDFLAGS) -ldl + +checkrt.c: res.h + +res.h: + gzip -k -f COPYING.RUNTIME COPYING3 && \ + xxd -i COPYING.RUNTIME.gz > $@ && \ + xxd -i COPYING3.gz >> $@ && \ + xxd -i COPYING.libgcc >> $@ && \ + xxd -i COPYING.libstdc++ >> $@ + +exec.o env.o: CFLAGS += -fPIC + +$(LIB): exec.o env.o + $(CC) -o $@ $^ -shared $(LDFLAGS) -ldl + +$(CHECKRT_TEST): checkrt.c + $(CC) -o $@ $(CFLAGS) -DCHECKRT_TEST $^ -ldl + +$(EXEC_TEST): exec.c env.o + $(CC) -o $@ $(CFLAGS) -DEXEC_TEST $^ -ldl + +$(ENV_TEST): env.c + $(CC) -o $@ $(CFLAGS) -DENV_TEST $^ + +run_tests: $(EXEC_TEST) $(ENV_TEST) $(CHECKRT_TEST) + ./$(ENV_TEST) + ./$(EXEC_TEST) + ./$(CHECKRT_TEST) + +.PHONY: $(BIN) all clean + diff --git a/src/checkrt.c b/src/checkrt.c new file mode 100644 index 0000000..abce2bf --- /dev/null +++ b/src/checkrt.c @@ -0,0 +1,392 @@ +/* Copyright (c) 2022 + * + * 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 "res.h" + +#ifdef __x86_64__ + 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 + +#define LIBGCC_S_SO "libgcc_s.so.1" +#define LIBSTDCXX_SO "libstdc++.so.6" +#define LIBGCC_DIR "gcc" +#define STDCXX_DIR "cxx" + +#define MAX(X,Y) (((X) > (Y)) ? (X) : (Y)) +#define PRINT_VERBOSE(FMT, ...) if (verbose) { fprintf(stderr, FMT, __VA_ARGS__); } + + +static char *get_libname(const char *lib, char verbose) +{ + struct link_map *map = NULL; + char *path; + + void *handle = dlopen(lib, RTLD_LAZY); + if (!handle) { + PRINT_VERBOSE("error: failed to dlopen() file: %s\n", lib); + return NULL; + } + + if (dlinfo(handle, RTLD_DI_LINKMAP, &map) == -1) { + PRINT_VERBOSE("error: could not retrieve information: %s\n", lib); + dlclose(handle); + return NULL; + } + + path = strdup(map->l_name); + dlclose(handle); + + return path; +} + +static int symbol_version(const char *lib, const char *symbol, char verbose) +{ + int fd = -1; + void *addr = NULL; + const char *error = ""; + + /* let dlopen() do all the compatibility checks */ + char *orig = get_libname(lib, verbose); + if (!orig) return -1; + + fd = open(orig, O_RDONLY); + if (fd < 0) { + PRINT_VERBOSE("error: failed to open() file: %s\n", orig); + free(orig); + return -1; + } + + PRINT_VERBOSE("%s\n", orig); + free(orig); + + /* make sure file size is larger than the required ELF header size */ + struct stat st; + if (fstat(fd, &st) < 0 || st.st_size < sizeof(Elf_Ehdr)) { + error = "fstat() failed or returned a too low file size"; + goto symbol_version_error; + } + + /* mmap() library */ + addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); + if (addr == MAP_FAILED) { + error = "mmap() failed"; + goto symbol_version_error; + } + + /* ELF header */ + Elf_Ehdr *ehdr = addr; + error = "offset exceeding filesize"; + if (ehdr->e_shoff > st.st_size) { + goto symbol_version_error; + } + + Elf_Shdr *shdr = addr + ehdr->e_shoff; + int shnum = ehdr->e_shnum; + Elf_Shdr *sh_strtab = &shdr[ehdr->e_shstrndx]; + + if (sh_strtab->sh_offset > st.st_size) { + goto symbol_version_error; + } + const char *sh_strtab_p = addr + sh_strtab->sh_offset; + const char *sh_dynstr_p = sh_strtab_p; + const char * const sh_strtab_p_const = sh_strtab_p; + + /* get strtab/dynstr */ + for (int i = 0; i < shnum; ++i) { + if (shdr[i].sh_type != SHT_STRTAB) continue; + const char *name = sh_strtab_p_const + shdr[i].sh_name; + + if (strcmp(name, ".strtab") == 0) { + if (shdr[i].sh_offset > st.st_size) { + goto symbol_version_error; + } + sh_strtab_p = addr + shdr[i].sh_offset; + break; + } else if (strcmp(name, ".dynstr") == 0) { + if (shdr[i].sh_offset > st.st_size) { + goto symbol_version_error; + } + sh_dynstr_p = addr + shdr[i].sh_offset; + break; + } + } + + /* iterate through sections */ + size_t len = strlen(symbol); + int maj = 0, min = 0, pat = 0; + for (int i = 0; i < shnum; ++i) { + if (shdr[i].sh_type != SHT_SYMTAB && shdr[i].sh_type != SHT_DYNSYM) { + continue; + } + + if (shdr[i].sh_offset > st.st_size) { + goto symbol_version_error; + } + Elf_Sym *syms_data = addr + shdr[i].sh_offset; + + /* iterate through symbols */ + for (size_t j = 0; j < shdr[i].sh_size / sizeof(Elf_Sym); ++j) { + if (syms_data[j].st_shndx != SHN_ABS) { + continue; + } + + const char *symbol_name; + if (shdr[i].sh_type == SHT_DYNSYM) { + symbol_name = sh_dynstr_p + syms_data[j].st_name; + } else { + symbol_name = sh_strtab_p + syms_data[j].st_name; + } + + if (strncmp(symbol_name, symbol, len) != 0) { + continue; + } + + int tmp_maj = 0, tmp_min = 0, tmp_pat = 0; + if (sscanf(symbol_name + len, "%d.%d.%d", &tmp_maj, &tmp_min, &tmp_pat) < 1) { + continue; + } + + if (tmp_maj < maj) { + continue; + } else if (tmp_maj > maj) { + maj = tmp_maj; + min = tmp_min; + pat = tmp_pat; + continue; + } + + if (tmp_min < min) { + continue; + } else if (tmp_min > min) { + min = tmp_min; + pat = tmp_pat; + continue; + } + + if (tmp_pat > pat) { + pat = tmp_pat; + } + } + } + + PRINT_VERBOSE("%s%d.%d.%d\n", symbol, maj, min, pat); + munmap(addr, st.st_size); + close(fd); + return (pat + min*1000 + maj*1000000); + +symbol_version_error: + PRINT_VERBOSE("error: %s: %s\n", error, orig); + munmap(addr, st.st_size); + close(fd); + return -1; +} + +static void dump_file(const char *dest, unsigned char *data, unsigned int len) +{ + int fd = creat(dest, DEFFILEMODE); + if (fd == -1) return; + if (write(fd, data, len) != len) unlink(dest); + close(fd); +} + +static int copy_lib(const char *lib, const char *destDir, char verbose) +{ + char *destFull = NULL; + int fdIn = -1, fdOut = -1; + + /* get full source and target paths */ + char *srcFull = get_libname(lib, verbose); + if (!srcFull) goto copy_lib_error; + + char *base = basename(srcFull); + if (!base) goto copy_lib_error; + + size_t len = strlen(destDir); + size_t len2 = strlen(base); + destFull = malloc(len + MAX(len2,32) + 2); + sprintf(destFull, "%s/%s", destDir, base); + + /* open source for reading */ + fdIn = open(srcFull, O_RDONLY|O_CLOEXEC); + if (fdIn == -1) goto copy_lib_error; + + /* open target for writing */ + mkdir(destDir, ACCESSPERMS); + fdOut = creat(destFull, DEFFILEMODE); + if (fdOut == -1) goto copy_lib_error; + + /* copy data into target */ + ssize_t n; + unsigned char buf[512*1024]; + while ((n = read(fdIn, &buf, sizeof(buf))) > 0) { + if (write(fdOut, &buf, n) != n) { + goto copy_lib_error; + } + } + + int rv = 0; + fprintf(stderr, ">> %s\ncopied to -> %s\n", srcFull, destFull); + + /* dump COPYING files */ + char *p = destFull + len + 1; + strcpy(p, "COPYING.RUNTIME.gz"); + dump_file(destFull, COPYING_RUNTIME_gz, COPYING_RUNTIME_gz_len); + p += 7; + strcpy(p, "3.gz"); + dump_file(destFull, COPYING3_gz, COPYING3_gz_len); + strcpy(p, ".libgcc"); + dump_file(destFull, COPYING_libgcc, COPYING_libgcc_len); + strcpy(p, ".libstdc++"); + dump_file(destFull, COPYING_libstdc__, COPYING_libstdc___len); + fprintf(stderr, "(COPYING files were added too)\n"); + + goto copy_lib_end; + +copy_lib_error: + rv = -1; + +copy_lib_end: + if (fdOut != -1) close(fdOut); + if (fdIn != -1) close(fdIn); + if (srcFull) free(srcFull); + if (destFull) free(destFull); + + return rv; +} + + +int main(int argc, char **argv) +{ +#if CHECKRT_TEST == 1 + + printf("Test:\n"); + copy_lib(LIBGCC_S_SO, "./" LIBGCC_DIR, 1); + copy_lib(LIBSTDCXX_SO, "./" STDCXX_DIR, 1); + symbol_version(LIBGCC_S_SO, "GCC_", 1); + symbol_version(LIBSTDCXX_SO, "GLIBCXX_", 1); + symbol_version("./" LIBGCC_DIR "/" LIBGCC_S_SO, "GCC_", 1); + symbol_version("./" STDCXX_DIR "/" LIBSTDCXX_SO, "GLIBCXX_", 1); + +#else + + char v = 0, copy = 0; + + for (int i=1; i < argc; i++) { + if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0) { + fprintf(stderr, + "usage:\n" + " %s -c|--copy-libraries\n" + " %s -h|--help\n" + " %s -v|--verbose\n" + "\n" + "This program will look for the following libraries relative to its\n" + "location, check if they are usable and add them to LD_LIBRARY_PATH\n" + "if they are newer than the system's equivalent:\n" + "\n" + " " LIBGCC_DIR "/" LIBGCC_S_SO "\n" + " " STDCXX_DIR "/" LIBSTDCXX_SO "\n", argv[0], argv[0], argv[0]); + return 0; + } else if (strcmp(argv[i], "-v") == 0 || strcmp(argv[i], "--verbose") == 0) { + v = 1; + } else if (strcmp(argv[i], "-c") == 0 || strcmp(argv[i], "--copy-libraries") == 0) { + copy = 1; + } else { + fprintf(stderr, "error: invalid argument: %s\nTry `%s --help' for more information.\n", argv[i], argv[0]); + return 1; + } + } + + char *currdir = realpath("/proc/self/exe", NULL); + if (!currdir) { + fprintf(stderr, "error: realpath() failed to resolve /proc/self/exe\n"); + return 1; + } + + char *p = strrchr(currdir, '/'); + if (!p) { + perror("strrchr()"); + free(currdir); + return 1; + } + *(p+1) = 0; + + int ver; + size_t len = strlen(currdir); + char *libpath = malloc(len + MAX(sizeof(STDCXX_DIR), sizeof(LIBGCC_DIR)) + + MAX(sizeof(LIBSTDCXX_SO), sizeof(LIBGCC_S_SO)) + 2); + strcpy(libpath, currdir); + p = libpath + len; + + if (copy) { + /* copy system libraries */ + strcpy(p, LIBGCC_DIR); + copy_lib(LIBGCC_S_SO, libpath, v); + strcpy(p, STDCXX_DIR); + copy_lib(LIBSTDCXX_SO, libpath, v); + } else { + /* get symbol versions */ + strcpy(p, LIBGCC_DIR "/" LIBGCC_S_SO); + ver = symbol_version(libpath, "GCC_", v); + if (ver != -1 && ver > symbol_version(LIBGCC_S_SO, "GCC_", v)) { + printf("%s" LIBGCC_DIR ":", currdir); + } + + strcpy(p, STDCXX_DIR "/" LIBSTDCXX_SO); + ver = symbol_version(libpath, "GLIBCXX_", v); + if (ver != -1 && ver > symbol_version(LIBSTDCXX_SO, "GLIBCXX_", v)) { + printf("%s" STDCXX_DIR ":", currdir); + } + + putchar('\n'); + } + + free(libpath); + free(currdir); +#endif + + return 0; +} + + + diff --git a/src/env.c b/src/env.c new file mode 100644 index 0000000..eef098a --- /dev/null +++ b/src/env.c @@ -0,0 +1,134 @@ +/* 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. + */ + +#define _GNU_SOURCE + +#include +#include +#include +#include +#include + +#include "env.h" + +static char** env_allocate(size_t size) { + return calloc(size + 1, sizeof(char*)); +} + +void env_free(char* const *env) { + size_t len = 0; + while (env[len] != 0) { + free(env[len]); + len++; + } + free((char**)env); +} + +pid_t get_parent_pid() { + pid_t ppid = 0; + char *s_ppid = getenv("PPID"); + + if(s_ppid) { + ppid = atoi(s_ppid); + } + + if (!ppid) { + ppid = getppid(); + } + + return ppid; +} + +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 = env_allocate(num_vars); + + 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("\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("Reading env from parent process: %s\n", buffer); + FILE *env_file = fopen(buffer, "r"); + if (!env_file) { + DEBUG("Error reading file: %s (%s)\n", buffer, strerror(errno)); + return NULL; + } + + char* const* env = env_from_buffer(env_file); + fclose(env_file); + + return env; +} + +char* const* read_parent_env() { + pid_t ppid = get_parent_pid(); + return read_env_from_process(ppid); +} + +#ifdef ENV_TEST +int main() { + putenv("APPIMAGE_CHECKRT_DEBUG=1"); + DEBUG("ENV TEST\n"); + char **env = NULL; + read_parent_env(&env); + + return 0; +} +#endif + diff --git a/src/env.h b/src/env.h new file mode 100644 index 0000000..8c2313e --- /dev/null +++ b/src/env.h @@ -0,0 +1,16 @@ +#ifndef ENV_H +#define END_H + +#include +#include + +pid_t get_parent_pid(); +char* const* read_parent_env(); +void env_free(char* const *env); + +#define DEBUG(...) do { \ + if (getenv("APPIMAGE_CHECKRT_DEBUG")) \ + printf("APPIMAGE_CHECKRT>> " __VA_ARGS__); \ +} while (0) + +#endif diff --git a/src/exec.c b/src/exec.c new file mode 100644 index 0000000..7e0187f --- /dev/null +++ b/src/exec.c @@ -0,0 +1,134 @@ +/* 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 `usr/optional/exec.so` exists: + * e.g `LD_PRELOAD=$APPDIR/usr/optional/exec.so My.AppImage` + * + * 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. + */ + +#define _GNU_SOURCE + +#include +#include +#include +#include +#include + +#include "env.h" + +typedef int (*execve_func_t)(const char *filename, char *const argv[], char *const envp[]); + +#define MIN(X,Y) ((X) < (Y) ? (X) : (Y)) + +static const char* get_fullpath(const char *filename) { + // Try to get the canonical path in case it's a relative path or symbolic + // link. Otherwise, use which to get the fullpath of the binary + char *fullpath = canonicalize_file_name(filename); + DEBUG("filename %s, canonical path %s\n", filename, fullpath); + if (fullpath) + return fullpath; + + return filename; +} + +static int is_external_process(const char *filename) { + const char *appdir = getenv("APPDIR"); + if (!appdir) + return 0; + DEBUG("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[]) { + const char *fullpath = get_fullpath(filename); + DEBUG("filename %s, fullpath %s\n", filename, fullpath); + char* const *env = envp; + if (is_external_process(fullpath)) { + DEBUG("External process detected. Restoring env vars from parent %d\n", get_parent_pid()); + env = read_parent_env(); + if (!env) { + env = envp; + DEBUG("Error restoring env vars from parent\n"); + } + } + int ret = function(filename, argv, env); + + if (fullpath != filename) + free((char*)fullpath); + if (env != envp) + env_free(env); + + return ret; +} + +int execve(const char *filename, char *const argv[], char *const envp[]) { + DEBUG("execve call hijacked: %s\n", filename); + execve_func_t execve_orig = dlsym(RTLD_NEXT, "execve"); + if (!execve_orig) + DEBUG("Error getting execve original symbol: %s\n", strerror(errno)); + + return exec_common(execve_orig, filename, argv, envp); +} + +int execv(const char *filename, char *const argv[]) { + DEBUG("execv call hijacked: %s\n", filename); + return execve(filename, argv, environ); +} + +int execvpe(const char *filename, char *const argv[], char *const envp[]) { + DEBUG("execvpe call hijacked: %s\n", filename); + execve_func_t execve_orig = dlsym(RTLD_NEXT, "execvpe"); + if (!execve_orig) + DEBUG("Error getting execvpe original symbol: %s\n", strerror(errno)); + + return exec_common(execve_orig, filename, argv, envp); +} + +int execvp(const char *filename, char *const argv[]) { + DEBUG("execvp call hijacked: %s\n", filename); + return execvpe(filename, argv, environ); +} + +#ifdef EXEC_TEST +int main(int argc, char *argv[]) { + putenv("APPIMAGE_CHECKRT_DEBUG=1"); + DEBUG("EXEC TEST\n"); + execv("./env_test", argv); + + return 0; +} +#endif