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2023-08-14add vsdo supportlordrasmus
2022-12-19add getauxval() implementationramin
2018-08-10rtld: Use ELF_RTYPE_CLASS_DLSYMChristophe Lyon
rtld must call _dl_find_hash() with ELF_RTYPE_CLASS_DLSYM since we want a function descriptor. * ldso/ldso/ldso.c (_dl_get_ready_to_run): Support __FDPIC__. Signed-off-by: Mickaël Guêné <mickael.guene@st.com> Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
2018-08-10TLS: fix relocation computationChristophe Lyon
* ldso/ldso/dl-elf.c (_dl_load_elf_shared_library): Fix l_tls_initimage computation. * ldso/ldso/ldso.c (_dl_get_ready_to_run): Likewise. Signed-off-by: Mickaël Guêné <mickael.guene@st.com> Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
2018-08-10rtld: Avoid FUNCDESC relocation on _startChristophe Lyon
* ldso/ldso/ldso.c (_start): Fix definition for __FDPIC__. Signed-off-by: Mickaël Guêné <mickael.guene@st.com> Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
2018-02-03bits/mman.h: consolidate header fileWaldemar Brodkorb
Sync with GNU C library and consolidate duplicate non architecture specific defines. MAP_UNINITIALIZED is only defined to 0x4000000 and used by the Linux kernel when CONFIG_MMAP_ALLOW_UNINITIALIZED is enabled. CONFIG_MMAP_ALLOW_UNINITIALIZED is only available for nommu. See Documentation/nommu-mmap.txt.
2017-06-21remove editor hints for viWaldemar Brodkorb
2017-04-08Same iteration variable used for inner and outer loopCupertino Miranda
Inner loop was using same counter variable (i) as the outer loop, therefore making outer loop terminate before it visited all of the ELF program segments. Surrounding code in this inner loop clearly shows the intention that this loop should not affect the outer one, therefore leading me to the conclusion that this should be a bug an not expected code. This bug was detected due to some other bug in ARC binutils that kept setting TEXTREL for any PIE application. Apart from the but, I have also moved the debug message inside of the TEXTREL condition as mprotect is only really called if TELTREL is set.
2017-04-08ldso: exit if zalloc can't alloc memoryVineet Gupta
_dl_zalloc callers don't check for allocaton failure. It kind of makes sense since such early allocations are unlikely to fail, and even if they do, ldso would segv anyways thus bringing the issue to attention. However there's a gcc nuance which led to this patch. It seems gcc at -O2 (for DODEBUG build), does additional coge gen analysis for pointer dereference from erroneous paths and it "isolates" such code paths with a intrinsic abort/trap etc. The ldso code fragment which was triggering this: | add_ldso(struct dyn_elf *rpnt) | if (rpnt) | ... | else | rpnt = _dl_zalloc() | | rpnt->dyn = tpnt <---- potential NULL pointer deref ARC gcc currently generates an abort() call which doesn't exist in ldso, causing link errors (with a newer vrsion of binutils). ARM gcc 6.2.1 behaves similarly, altough instead of abort, it generates a trap inducing UDF instruction | 367c: ebfffb79 bl 2468 <_dl_malloc> | 3680: e51b2068 ldr r2, [fp, #-104] ; 0xffffff98 | 3684: e3500000 cmp r0, #0 | 3688: 0a000006 beq 36a8 <_dl_add_elf_hash_table+0x280> | ... | 36a8: e5862000 str r2, [r6] | 36ac: e7f000f0 udf # So add an explict dl_exit() in dl_zalloc error case to beat the compiler. Note that this error propagagtion analysis stops if the function in consideration (_dl_zalloc) is NOT inlined. Hence the reason it only shows up for DODEBUG builds which builds ldso at -O2 which is more aggressive about inlining. If this patch is not considered worth applying then the workaround suggested by Claudiu is to to build ldso with -fno-isolate-erroneous-paths-dereference Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
2016-06-22ldso: Consistently set & use DL_OPENED flag in both ld.so and libdlLeonid Lisovskiy
Previously, DL_OPENED flag was set in libdl only and never used. Set it centralized in _dl_load_elf_shared_library() & use it in both ld.so and libdl. Additionally, rename it to DL_OPENED2 for clarity. Signed-off-by: Leonid Lisovskiy <lly.dev@gmail.com>
2016-06-07ssp: remove SSP legacy codeWaldemar Brodkorb
Nobody should use gcc 3.3 nowadays.
2016-01-31ldso: Use single rtld_flags interpretation through all the callsLeonid Lisovskiy
Implement single rtld_flags interpretation through all the do_dlopen()/_dl_load_shared_library()/_dl_load_elf_shared_library() calls chain. This adds the ability to use the flags, passed to dlopen(), in all underlaying functions and implement rtld_flags inheritance. Saves a few bytes code. Signed-off-by: Leonid Lisovskiy <lly.dev@gmail.com> Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>
2015-04-24merge uClibc changesWaldemar Brodkorb
2015-04-22ldso: PRELINK: Remove surplus newlineBernhard Reutner-Fischer
in early debugging code Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2015-01-25add support for $ORIGINWaldemar Brodkorb
This is for example required, used and tested with OpenJDK 7. No regressions found, while running the testsuite with embedded-test.
2014-04-23ldso: Fix misplaced declarationBernhard Reutner-Fischer
Apparently i made a typo when applying 278a06d7abcc8774ba9bb9c15779749c7e2d68cd sorry.. Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2014-04-08ldso: fix standalone execution on x86_64 architectureCédric VINCENT
If the dynamic linker is built with LDSO_STANDALONE_SUPPORT=y, it can load then run a dynamically linked program when explicitly invoked from the command line. This is used for test and prelink purposes, and also by other tools like PRoot to force the kernel to load the right ELF interpreter. This feature is currently broken on x86_64 since the number of command line arguments (ie. argc) passed from the kernel is an "elf_addr_t" (64 bit on x86_64), whereas it is read as an "unsigned int" (32 bit on x86_64). Ref: https://github.com/cedric-vincent/PRoot/issues/45 Signed-off-by: Cédric VINCENT <cedric.vincent@st.com> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2013-11-12ldso: silence warnings in debug codeBernhard Reutner-Fischer
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2013-11-06ldso: fix unused variable warningBaruch Siach
This fixes the following warning when SUPPORT_LD_DEBUG_EARLY is not enabled: ldso/ldso/ldso.c: In function '_dl_get_ready_to_run': ldso/ldso/ldso.c:754:16: warning: unused variable 'tmp' [-Wunused-variable] This was introduced with commit 94cc6edb (ldso: Rework global scope handling and symbol lookup mechanism). Cc: Filippo Arcidiacono <filippo.arcidiacono@st.com> Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2013-05-13libc: deal with aux vect inside __uClibc_main only if !SHAREDFilippo ARCIDIACONO
It's not safe to use the aux vect inside __uClibc_main if we are running with shared libraries, because it could have been already modified. For example, if some constructor plays with environment variables by using unsetenv, the modifications done into the stack to unset an environment variable, have impacts on the aux vect due to the extra NULL entries added. Due to this, __uClibc_main is not able to detect where the aux vect starts, so all the entries that are used by __uClibc_main (AT_UID, AT_EUID, AT_GID, AT_EGID, AT_PAGESZ and possibly other arch specific) are impacted. Same side effect on the aux vect is caused by the ld.so when running a SUID program with some of the unsecure environment variables set, that will be unset by the ld.so itself. In order to fix this issue, it needs to handle aux vect entries into __uClibc_main only if SHARED is not defined. In SHARED case, libc refers to __dl_secure and _dl_pagesize as initialised by the ld.so where the aux vext is still untouched. Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com> Reviewed-by: Carmelo Amoroso <carmelo.amoroso@st.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2013-02-05mman: rename MAP_UNINITIALIZE to MAP_UNINITIALIZEDBernhard Reutner-Fischer
The name was changed to include a trailing 'D' when it went into the kernel. Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2012-06-15ldso: use _dl_strdup and _dl_dprintf only in ld-uClibc.soPeter S. Mazinger
Add support for %p to _dl_dprintf for later corrections in debug messages. Disable _dl_debug_file if LD debugging is not enabled and change it's use to 2. The use of dprintf in elfinterp.c will spit out warnings, will be fixed in the reworked ldso. Signed-off-by: Peter S. Mazinger <ps.m@gmx.net> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2012-06-06ldso: preload standard path library with setuid bit setFilippo Arcidiacono
For set-user-ID/set-group-ID ELF binaries, only libraries in the standard search directories that are also set-user-ID must be loaded. This patch fixes existing logic according to the above statement. Furthermore if either library setuid bit isn't set or it cannot be found in the standard search path, the library won't be preloaded but execution go ahead with default one. Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2012-06-06Clean up DSBT supportMark Salter
The existing DSBT support relies on the kernel to provide DSBT info as part of the load maps passed to user space. The problem with this approach is that the DSBT info is in the dynamic section, so the kernel must access a userspace mapping of the dynamic section (or separately read a copy for the kernel) in order to retrieve the information needed by userspace. This patch reworks the DSBT support to remove the reliance on DSBT info coming from the kernel. Instead, ldso reads the info itself from the dynamic section. One other benefit of this is that it allows the existing kernel FDPIC loader to also load DSBT binaries. Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2012-05-18ldso: sh: handle _dl_skip_args in linker startup instead of __uClibc_mainFilippo Arcidiacono
Handle _dl_skip_args in the asm part of the dynamic linker startup, to skip the ldso arguments, so we can keep this symbol hidden as other archs do. Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2012-04-08ldso: fix fdpic support broken from prelink patchFilippo Arcidiacono
The fdpic support has been broken since the prelink support was added, because it didn't take into account DL_LOADADDR_TYPE could be a different type of ElfW(Addr). Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2012-01-27ldso: fix typo in debug messageBernhard Reutner-Fischer
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2012-01-02ldso: setup search path even when there are no "/"Mike Frysinger
If people use an interp path such as "ld.so", then there is no "/" found, and we end up dereferencing a NULL pointer. Simplify the logic by having a relative interp path like that be the same as "" (which the code later on interprets as $PWD). While we're here, document some of the nuances of this code. Reported-by: Ignacy Gawędzki <uclibc@qult.net> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2012-01-02ldso: simplify interp path search logicMike Frysinger
The setup logic is duplicated, so unify it in a local func. Mark the variable const while we're doing this, and add missing ifdef protection to the header that declares it availability. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2011-11-07ldso: support RTLD_NOLOADTimo Teräs
So application query if specified module is loaded or not with dlopen. Signed-off-by: Timo Teräs <timo.teras@iki.fi> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2011-10-25ldso: let people disable to lookup into LD_LIBRARY_PATHCarmelo Amoroso
On hardened system it could be useful to disable the use of LD_LIBRARY_PATH. Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2011-10-25ldso: minor fixes to implicit search pathCarmelo Amoroso
Do not defined _dl_ldsopatch if implicit search path if not enabled, and avoid to call search_for_named_library (even if it is able to handle NULL search path). Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2011-10-25ldso: disable the implicit path search in stand-alone mode as wellCarmelo Amoroso
Honour LDSO_SEARCH_INTERP_PATH knob option also when running in stand-alone mode. Signed-off-by: Rune <u-uclibc-y2lt@aetey.se> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2011-08-26ldso: fix build with PRELINK enabled and !TLSCarmelo Amoroso
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2011-07-12ldso: fix build error due to missing variable 'st'Douglas Mencken
Fix a build error triggered when LDSO_PRELOAD_FILE_SUPPORT is enabled due to missing definition of 'st' variable. Signed-off-by: Douglas Mencken <dougmencken@gmail.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2011-04-06Merge remote-tracking branch 'origin/master' into prelinkCarmelo Amoroso
* origin/master: (137 commits) utils/ldd: Check for returned pointer from strrchr not the value it holds cris: add provide arch-specific vfork implementation lutimes.c, stubs.c: fix compiling lutimes, if __NR_utimensat is not defined bump version to 0.9.32-rc3-git release 0.9.32-rc3 memalign: include sys/param.h for MAX arm/bits/atomic.h: Include common/bit/atomic.h for thumb1 wctype.h: fix libc_hidden_proto for iswupper and add it for iswspace add libc_hidden_proto for wcs[n]casecmp_l really fix missing __libc_drand48_data Revert "missing prototype of __libc_drand48_data fixed" missing prototype of __libc_drand48_data fixed time.c, time.h: remove unused hidden strftime/strptime nanosleep.c: remove duplicated libc_hidden_proto ctype.c, ctype.h: remove commented parts that were banned for removal after 0.9.31 _wctype.c, wctype.h: remove unused isw* and wctype_l hidden functions time.c, wchar.h: remove unused hidden wcsftime str[n]casecmp.c: fix hidden usage remove unused hidden functions frv/memset.S: add missing libc_hidden_def ... Conflicts: ldso/ldso/ldso.c Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2011-03-05Add support for DSBT ELF to ld.soMark Salter
This adds support for DSBT ELF to ld.so. This uses loadmaps like FD-PIC. Some code is added in ld.so to initialize the DSBT tables, and there's also a new target macro FINISH_BOOTSTRAP_RELOC. Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: Aurelien Jacquiot <a-jacquiot@ti.com> Signed-off-by: Bernd Schmidt <bernds@codesourcery.com>
2011-03-03Correct ssp codePeter S. Mazinger
Avoid using strong_alias in ssp, some archs dislike it. Make stack_chk_guard static. Export __stack_smash_handler only if compatibility option is enabled. Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
2011-03-03syntax fixPeter S. Mazinger
Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
2011-01-21Merge remote branch 'origin/master' into prelinkCarmelo Amoroso
* origin/master: bump version to 0.9.32-rc2-git release 0.9.32-rc2 nptl: Fix __USER_LABEL_PREFIX__ concatenatio nptl: fix start_thread() for _STACK_GROWS_UP ldso: get rid of _dl_lookup_hash Add protected symbols support for all architectures Revert "ldso/arm: Correct protected symbol resolution" Revert "ldso_sh: add support for protected symbols to SH" Revert "ldso/i386: support protected symbols" cris: Fix build issues syslog: fix 'everyone logs with user facility' __psfs_parse_spec: always use long int for %p buildsys: headers target should not depend on sysnum.h buildsys: fix make release target nptl: get rid of the last preprocessor warning when __ASSUME_TGKILL is not defined remove uClibc_ctype.h if !LOCALE Revert "Makefile.in: Add header to 'all' target" nptl: get rid of preprocessor warning when __ASSUME_TGKILL is not defined Conflicts: ldso/include/dl-hash.h ldso/ldso/arm/elfinterp.c ldso/ldso/avr32/elfinterp.c ldso/ldso/bfin/elfinterp.c ldso/ldso/cris/elfinterp.c ldso/ldso/dl-hash.c ldso/ldso/i386/elfinterp.c ldso/ldso/m68k/elfinterp.c ldso/ldso/mips/elfinterp.c ldso/ldso/powerpc/elfinterp.c ldso/ldso/sh/elfinterp.c ldso/ldso/sh64/elfinterp.c ldso/ldso/sparc/elfinterp.c ldso/ldso/x86_64/elfinterp.c ldso/ldso/xtensa/elfinterp.c ldso/libdl/libdl.c Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2010-09-17ldso: Fix loadaddr and mappaddr when prelink support is enabled.Filippo Arcidiacono
Fixed loadaddr and mappaddr fields to correctly work when prelink support is enabled. - loadaddr is an offset relative to the first loadable segment. - mapaddr is the address where the object has been mapped in memory. Non PIC library detection fixed too. Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2010-09-17ldso: Add runtime prelink supportFilippo Arcidiacono
Added runtime prelink support to be able to run a prelinked application; at process startup only the conflicts will be relocated. This speed up the startup time. Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2010-09-17ldso: Do not add the ld.so at the end of the loaded modules listFilippo Arcidiacono
The dynamic linker was included indifferently at the end of the loaded modules list. In order to be used with prelink, it is required to included the ld.so in the local scope of each shared libraries that depends directly on it. Also it is included in the global scope at the first occurrence. Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2010-09-17ldso: Add support for LD_WARN and LD_TRACE_PRELINKINGFilippo Arcidiacono
Added support for the following tracing capabilities: - LD_WARN to warn about undefined symbols during the lookup stage. - LD_TRACE_PRELINKING to trace the needed libraries of the object that we are prelinking. Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2010-09-17ldso: Rework global scope handling and symbol lookup mechanismFilippo Arcidiacono
Global symbol scope is implemented as a linked list of local scope, that dynamically grows and shrinks when dlopen/ dlclose are called. Each local scope is implemented as an array of pointer to struct elf_resolve. This will help to detect conflict when LD_TRACE_PRELINKING option will be implemented. Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2010-09-17ldso: Add implementation of ld.so standalone executionFilippo Arcidiacono
The dynamic linker can be run either indirectly through running some dynamically linked program or library (in which case no command line options to the dynamic linker can be passed and, in the ELF case, the dynamic linker which is stored in the .interp section of the program is executed) or directly by running: /lib/ld-uClibc.so.* [OPTIONS] [PROGRAM [ARGUMENTS]] Stand-alone execution is a prerequisite for adding prelink capabilities to uClibc dynamic linker, as well useful for testing an updated version of the dynamic linker without breaking the whole system. Currently supported option: --library-path PATH use given PATH instead of content of the environment variable LD_LIBRARY_PATH (Mandatory for prelinking) Not supported options: --list list all dependencies and how they are resolved --verify verify that given object really is a dynamically linked object we can handle --inhibit-rpath LIST ignore RUNPATH and RPATH information in object names in LIST This feature can be enabled by setting LDSO_STANDALONE_SUPPORT=y Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2010-04-14Merge commit 'origin/master' into nptlAustin Foxley
Signed-off-by: Austin Foxley <austinf@cetoncorp.com>
2010-04-14ldso: Add config option for controlling LD_PRELOADCarmelo AMOROSO
On hardened system it could be useful to disable the use of LD_PRELOAD environment variable for preloading shared objects before the system libraries. So this patch add a config option, LDSO_PRELOAD_ENV_SUPPORT, to control this behaviour. It is enabled by default. Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2010-01-21ldso: tweak shadow warning with preload file supportBernhard Reutner-Fischer
The stat buffer is already declared at the top of the function. Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com> (cherry picked from commit 6140a2a7175a796a7c06119f036357db87a1b865) Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2010-01-21ldso: tweak shadow warning with preload file supportBernhard Reutner-Fischer
The stat buffer is already declared at the top of the function. Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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