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path: root/linker/linker.cpp
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2015-05-07Use realpath for log and error messagesDmitriy Ivanov
Bug: http://b/20885931 Change-Id: Ida8ab7982ca75fa73da13c4cb10a6b2e53bc2c8e
2015-05-06VersionTracker: Ignore libraries without sonameDmitriy Ivanov
Bug: http://b/20872443 Change-Id: I7bd076885c1feae39af6ea64c9442bcc5ae5a1dc (cherry picked from commit 8264afb37778bea2a3c6e9aa7144f4877401c3f8)
2015-04-30Lookup version info when relocating mips gotDmitriy Ivanov
Bug: http://b/20693971 Bug: http://b/20139821 Change-Id: I28bd3bc44dafe048761b2c598facfe20320128c4
2015-04-30Refactoring: move VersionTracker to link_imageDmitriy Ivanov
Use one instance of VersionTracker per link (instead of 2). Change-Id: I6860013df65f5969975c82ebdae8bd90a82e0a82
2015-04-30Refactoring: extract lookup_version_info(..)Dmitriy Ivanov
Change-Id: I47f9c21a1738dc520fd83281c8227dc3a7e79650
2015-04-29Merge "linker: initialize system properties"Dmitriy Ivanov
2015-04-28Fix LD_PRELOAD for dlopen()Dmitriy Ivanov
We did not set DF_1_GLOBAL flag for LD_PRELOADed libraries which led to the situation when ld_preloads where ignored during on dlopen() Change-Id: I696b3b2506a8ed4c0984ad2c803210a7a4f8e686
2015-04-28linker: initialize system propertiesDmitriy Ivanov
Bug: http://b/20567629 Bug: https://code.google.com/p/chromium/issues/detail?id=478886 Change-Id: I8d2d89b749015e7fcd6e7ea646911f2e617dd1ba
2015-04-27Remove outdated warningDmitriy Ivanov
It is ok to use malloc in linker. Bug: http://b/20567629 Change-Id: I54183dbe8ebcd223a44e710e511c339688a65dba
2015-04-22Always use signed leb128 decoderDmitriy Ivanov
Relocation packer no longer encodes relocation tables using unsigned leb128: https://android-review.googlesource.com/147745 Bug: http://b/18051137 Change-Id: I620b7188e5f3dd9d5123431aa1fc7feca76be607
2015-04-20Add library name to error messageDmitriy Ivanov
Change-Id: I079e6f1dd95fe9cae2135fcd7358c51f8b584ac9
2015-04-16Support symbol versioningDmitriy Ivanov
Bug: http://b/20139821 Change-Id: I64122a0fb0960c20b2ce614161b7ab048456b681
2015-04-06Add realpath for soinfoDmitriy Ivanov
This change adds realpath to soinfo and extends limit on filenames from 128 to PATH_MAX. It also removes soinfo::name field, linker uses dt_soname instead. Bug: http://b/19818481 Bug: https://code.google.com/p/android/issues/detail?id=80336 Change-Id: I9cff4cb5bda3ee2bc74e1bbded9594ea7fbe2a08
2015-04-03Merge "Add ANDROID_DLEXT_FORCE_LOAD flag"Dmitriy Ivanov
2015-04-03Add ANDROID_DLEXT_FORCE_LOAD flagDmitriy Ivanov
This flag allows to force loading of the library in the case when for some reason multiple ELF files share the same filename (because the already-loaded library has been removed and overwritten, for example). Change-Id: I798d44409ee13d63eaa75d685e99c4d028d2b0c1
2015-04-02Look into local group on dlsym with RTLD_DEFAULTDmitriy Ivanov
Fix dlsym to look into local group when called with RTLD_DEFAULT and RTLD_NEXT. Bug: 17512583 Change-Id: I541354e89539c712af2ea4ec751e546913027084
2015-04-01Revert "Remove text-relocation support for lp32"Dimitry Ivanov
This reverts commit cb00add1b382d1e3045876d7e1ccbee2fdce976b. Bug: 20020312 Bug: 20013628 Change-Id: I8baa3d4b6c7fef50c9e2531257d5b96762099eb3
2015-03-31Remove text-relocation support for lp32Dmitriy Ivanov
Bug: 20013628 Change-Id: Idaf8012f00ee1304d429c3b42f9ebc6b648c55b8
2015-03-31Fix long lines and replace macros with functions.Dmitriy Ivanov
Change-Id: I4e1cab488d5b2c8e4289da617350a86e72a4ba12
2015-03-24Replace fixed arrays with vectorsDmitriy Ivanov
This effectively removes limit on length and count of LD_LIBRARY_PATH and LD_PRELOAD entries. Change-Id: Ie7ea34a50d99c4018f9dd1a33aaebc4049a7f424
2015-03-18Implement lookup by DT_SONAMEDmitriy Ivanov
This CL also fixes SEARCH_NAME hack and resolves https://code.google.com/p/android/issues/detail?id=6670 once and for all. Bug: https://code.google.com/p/android/issues/detail?id=6670 Change-Id: I9b8d6a672cd722f30fbfbb40cdee8d9b39cfe56e
2015-03-18Fix library lookup for filenames with slash.Dmitriy Ivanov
If filename contains a slash, then it is interpreted as a (relative or absolute) pathname. Bug: https://code.google.com/p/android/issues/detail?id=6670 Change-Id: Iba57d638301f3089ad47ba083edca2dd36b801ed
2015-03-16Support loading shared libraries from zip filesSimon Baldwin
Add code to support loading shared libraries directly from within APK files. Extends the linker's handling of LD_LIBRARY_PATH, DT_RUNPATH, etc to allow elements to be either directories as normal, or ZIP format files. For ZIP, the ZIP subdirectory string is separated from the path to file by '!'. For example, if DT_NEEDED is libchrome.so and Chrome.apk is the Android ARM APK then the path element /system/app/Chrome.apk!lib/armeabi-v7a would cause the linker to load lib/armeabi-v7a/libchrome.so directly from inside Chrome.apk. For loading to succeed, libchrome.so must be 'stored' and not compressed in Chrome.apk, and must be page aligned within the file. Motivation: Chromium tracking issue: https://code.google.com/p/chromium/issues/detail?id=390618 Bug: 8076853 Change-Id: Ic49046600b1417eae3ee8f37ee98c8ac1ecc19e7
2015-03-16General purpose memory allocator for linker.Dmitriy Ivanov
Add basic general purpose memory allocator to linker in order to enable usage of other libraries like libziparchive. Change-Id: I4a680ebb36ed5ba67c61249f81dba9f567808434
2015-03-10Rename LinkerAllocator and LinkerAllocatorPageDmitriy Ivanov
Change-Id: I87d80fbcd4ec26c0ee4f601b9c4c64f600418dd9
2015-03-10Refactoring: rename linker_allocator filesDmitriy Ivanov
Change-Id: Ifc08e64b3a85205f072b7abab1149c7ab71e2f75
2015-03-09Store fields for gnu_hash separatelyDmitriy Ivanov
Kindle app relies on soinfo's sysv hash fields while linking native libraries. This change allows to keep sysv hash fields intact for the libraries linked with --hash-style=both. Bug: 19059885 Change-Id: I12528652955638f1a6586bda99e111bb1c8aa7a3
2015-03-07linker: Allow an app to update it's own LD_LIBRARY_PATHNick Kralevich
When the kernel executes a program which is setuid, setgid, has file capabilities, or causes an SELinux domain transition, the AT_SECURE flag is set. This flag instructs the dynamic linker to prune any dangerous environment variables passed across security boundaries. For SELinux in particular, whether this flag is set depends on the the "noatsecure" process permission. If that permission does not exist, then AT_SECURE=1 whenever a domain transition occurs. In https://android-review.googlesource.com/129971 , Android stopped using noatsecure when executing init services. In https://android-review.googlesource.com/130610 , init was flipped back into SELinux enforcing mode, making ag/129971 active. The combination of those two changes ensured that AT_SECURE=1 was set when executing init spawned services. In particular, AT_SECURE=1 is set when init executes zygote. Due to the forking nature of zygote, AT_SECURE remains untouched when executing zygote's children. This causes problems for the code added in https://android-review.googlesource.com/48409 . Specifically, if AT_SECURE=1, an attempt to call android_update_LD_LIBRARY_PATH() is silently ignored. This causes problems when art tries to adjust the LD_LIBRARY_PATH for Android apps. Ultimately, apps are unable to find shared libraries they depend on. As discussed in bug 7896159, there's no security reason for preventing an application from updating it's own LD_LIBRARY_PATH. We only need to prune LD_LIBRARY_PATH when transitioning across security boundaries, but not when we're entirely within a security boundary. Remove the AT_SECURE check within do_android_update_LD_LIBRARY_PATH(). It's unneeded and prevents an application from modifying it's own LD_LIBRARY_PATH. This allows an application to specify a location where it's dlopen()ed shared libraries should be loaded from. There is no change to AT_SECURE handling in __sanitize_environment_variables(). We continue to honor it there to prevent using security sensitive environment variables across an exec boundary. Bug: 19559835 Change-Id: If4af2ee8e84265aaa0c93de8b281208b20d7942a
2015-03-06Add support for packed relocations.Dmitriy Ivanov
Change-Id: I796a4ce86d3fccb8361c19889419c96147ee3c9f
2015-03-06Refactoring: introduce reloc_iteratorsDmitriy Ivanov
Replace rel/rela array with reloc_iterators. Change-Id: I6165d062e0390b6bc60da2e8279aabbedf828ec9
2015-02-13Fix: DT_DEBUG was acting as DT_REL on mips64Dmitriy Ivanov
Change-Id: I88827aa07d75d06d606c987e6270fcca3ae6216f
2015-02-04linker: Use load_bias to adjust search address in elf_addr_lookupChris Dearman
load_bias is the delta between a symbols address in memory and the value contained in the symbol table. Change-Id: I35c87b69025b64f7e4a1418ca766618f4533fb3e
2015-01-23Minimize calls to mprotectDmitriy Ivanov
Implement refcounter based data protection guard to avoid unnecessary calls to mprotect when dlopen/dlclose is called from a constructor. Bug: 19124318 Big: 7941716 Change-Id: Id221b84ce75443094f99756dc9950b0a1dc87222
2015-01-23Add a log message to make the transition from linker to user code clear.Elliott Hughes
Handy when looking at strace output for seeing "where does my code start?", though you'll need to set LD_DEBUG=1 (or greater) and constructors will already have run (but you can set LD_DEBUG to a higher value to track that). Change-Id: I82d53a7123b39febf5b2a956de83c8a30f229651
2015-01-22Enable -Wold-style-cast warnings for linkerDmitriy Ivanov
And fix old style casts. Change-Id: I37e7a3e3fd852528ea76f02d967c7bd8cd5b06c9
2015-01-14Refactoring: move mips reloc to separate methodDmitriy Ivanov
Change-Id: I712614853e3f0e515f5c2bdd8f0aaa5feeae8e55
2015-01-13Refactoring: unify relocate functionDmitriy Ivanov
Use one relocate for all platforms. Change-Id: I43e75162c5b29105e651defc11a511e168368736
2015-01-13Refactoring: use generic reloc constantsDmitriy Ivanov
Change-Id: I94dd6256b1b4509b6ea696a3aff17a3991529468
2015-01-13Revert "Refactoring: use generic reloc constants"Dimitry Ivanov
This reverts commit 265a60a0d285a733d9d98f53672bce668803b434. Change-Id: I6d46db0ac03cda44ed1e20f6084a552e0089eb14
2015-01-13Refactoring: use generic reloc constantsDmitriy Ivanov
Change-Id: I67918a1a926164a38a5a47f2264390632eb42905
2015-01-09Refactor soinfo::relocateDmitriy Ivanov
Move common relocation types outside of ifdefs Change-Id: I713800ce123a18178b5ac80c0b3c7bd6b21a02c2
2015-01-08Merge "Set linux 32bit personality for 32 bit processes"Dmitriy Ivanov
2015-01-07Set linux 32bit personality for 32 bit processesDmitriy Ivanov
Bug: 18069809 Change-Id: Ie143d56b0f8f03510dc451649291067e1add1d2f
2015-01-07Print error when prelink fails for main executableDmitriy Ivanov
Bug: 18931021 Change-Id: Ib6c39a409161b20a10c3485272c73bc2abd4ee4f (cherry picked from commit d9e211ca1fcf8bb78a1e1de9e54fe7c8d0a01518)
2014-12-19Add support for DT_MIPS_RLD_MAP2 tag.Raghu Gandham
Position Independent Executables cannot communicate with GDB using DT_MIPS_RLD_TAG. Hence a new tag DT_MIPS_RLD_MAP2 got introduced to fix the issue. Change-Id: I77ce3faf1ef2e121003b804ecd291abb25cfbb56 Signed-off-by: Nikola Veljkovic<Nikola.Veljkovic@imgtec.com>
2014-12-02Fix soinfo_unloadDmitriy Ivanov
1. Take into consideration that the local_group_root_ is not set for all of not linked libraries. 2. We need to check visited list earlier to avoid double soinfo_free. Change-Id: Iabc0a06a97c63f7e6bd4641731f50bb1466fed4f
2014-12-02Fix mips buildDmitriy Ivanov
Change-Id: Iddbf06784d19556a55d833e20a68e6ccf5a7c5be
2014-12-02Merge "Count references for groups instead of instances"Dmitriy Ivanov
2014-12-02Count references for groups instead of instancesDmitriy Ivanov
Count references on the group level to avoid partially unloading function that might be referenced by other libraries in the local_group Bonus: with this change we can correctly unload recursively linked libraries. is_recursive check is removed. Also dynamic executables (not .so) with 0 DT_NEEDED libraries are now correctly linked. Change-Id: Idfa83baef402840599b93a875f2881d9f020dbcd
2014-12-02Resolve "unused DT entry" warnings for DT_VERNEED and DT_VERNEEDNUM.Alexander Ivchenko
Change-Id: Id18310811a6d183878a1d4d26cc2498f4fd00c55 Signed-off-by: Alexander Ivchenko <alexander.ivchenko@intel.com>
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