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2018-11-16Finish ld.so's transition to GNU_RELRO: eliminate support for usingPhilip Guenther
__got_{start,end} to find a region to mark read-only. It was only used for binaries that didn't have a GNU_RELRO segment, but all archs have been using that for over a year. Since support for insecure-PLT layouts on powerpc and alpha have been removed, all archs handle GNU_RELRO the same way and the support can be moved from the MD code to the MI code. ok mpi@
2018-10-25The compilers already put static arrays in .rodata when not written to;Philip Guenther
marking them const will keep a source change from silently moving them back to .data ok deraadt@ kettenis@
2018-07-09unify the various per-arch syscall.h as much as possibleTheo de Raadt
ok kettenis guenther
2018-04-27Make sure ld.so doesn't use floating point registers, as the lazy-bindingPhilip Guenther
stub doesn't preserve them and some may be used for passing arguments ok kettenis@ deraadt@ mlarkin@
2017-10-27Use <elf.h> instead of <elf_abi.h>Martin Pieuchot
ok jasper@, jca@, deraadt@
2017-08-28whitespaceTheo de Raadt
2017-08-27Replace heaps of hand-written syscall stubs with a simpler frameworkTheo de Raadt
which is largely MI. ok visa kettenis
2017-08-15Align text locations to 16 (instead of 4) to match modern recommendationsTheo de Raadt
(generally associated with hardwired BTC limitations). And then fill those alignments with 0xcc (int 3) to match our trapsled model. Resulting binaries show no sequential nop's. ok mlarkin kettenis mortimer
2017-01-24On fatal errors, kill ourselves with thrkill(0,9,NULL) instead ofPhilip Guenther
simply exiting, via helper functions _dl_die(), _dl_diedie(), and _dl_oom(). prompted by a complaint from jsing@ ok jsing@ deraadt@
2017-01-23Fix format string mismatchesPhilip Guenther
2017-01-21_dl_exit() is __dead, so it should return void.Philip Guenther
Move _dl_mmap() and _dl_mquery() inlines from archdep.h to syscall.h and remove pointless casts and unnecessary parens. ok kettenis@
2017-01-20Delete ancient macros and unnecessary #includesPhilip Guenther
ok deraadt@
2017-01-09Remove dependency on __got_{start,end} symbols and look at PT_GNU_RELROMark Kettenis
instead. Result in a few more pages that aren't writable on some platforms (such as hppa). Based on an initial diff from guenther@. Thanks to deraadt@ for testing. ok guenther@
2016-08-28ld.so doesn't need gettimeofday or lstat stubs any morePhilip Guenther
ok deraadt@
2016-07-04Remove prebind support: binding to symbol table indices is too fragilePhilip Guenther
for our development process. ok kettenis@ deraadt@
2016-06-21When handling DT_TEXTREL only set the mapping to READ+WRITE, ignoreTheo de Raadt
possible EXEC permission for the section, because the proper permission is set late, and there are no thread concerns here. Avoids W^X issues in oddball cases. ok guenther kettenis
2016-05-18fix types for mmap wrappers. A few whitespace cleanups snuck in.Theo de Raadt
ok guenther
2016-05-07Use a Thread Information Block in both single and multi-threaded programs.Philip Guenther
This stores errno, the cancelation flags, and related bits for each thread and is allocated by ld.so or libc.a. This is an ABI break from 5.9-stable! Make libpthread dlopen'able by moving the cancelation wrappers into libc and doing locking and fork/errno handling via callbacks that libpthread registers when it first initializes. 'errno' *must* be declared via <errno.h> now! Clean up libpthread's symbol exports like libc. On powerpc, offset the TIB/TCB/TLS data from the register per the ELF spec. Testing by various, particularly sthen@ and patrick@ ok kettenis@
2016-03-21Rename the system call sendsyslog2 to sendsyslog. Keep the old oneAlexander Bluhm
as osendsyslog for a while. The three argument variant is the only one that will stay. input kettenis@; OK deraadt@
2016-03-21Switch ld.so's stack smash handler from sendsyslog to sendsyslog2Philip Guenther
and pass the LOG_CONS flag like libc's handler. ok deraadt@ bluhm@ (who had a similar diff)
2015-12-06Simplify the relocation code for the ld.so bootstrap and static pie: trackPhilip Guenther
just the dynamic tags are needed instead of reusing the generic elf_object_t structure. testing and feedback from miod@ ok kettenis@
2015-11-15ldd(1) sets environment variable LD_TRACE_LOADED_OBJECTS to tell ld.soTheo de Raadt
that it should show information about the program it loads, rather than run it. In that specific case, ld.so can pledge to "stdio rpath" to ensure that code path in ld.so has no bugs. Yes, a pledge in ld.so.... who'd have thought! ok guenther
2015-11-02Factor out the logic for mprotecting the memory between two symbols intoPhilip Guenther
a new MI routine _dl_protect_segment(), and use that for protecting the GOT and--on some archs--the PLT. Amazing testing turnaround by miod@, who apparently violated relativity to get back results on some archs as fast as he did
2015-09-19kbind has eliminated the need for and use of the bind lock. Delete it, thePhilip Guenther
the callback, and the sigprocmask stub. Keep around the DL_SETBINDLCK case until libpthread stops using it. discussed with miod@ at l2k15 ok kettenis@
2015-09-13Rename __sysctl syscall to just sysctl, as the userland wrapper is no longerPhilip Guenther
necessary ok deraadt@ jsing@
2015-08-23Use kbind for lazy binding GOT/PLT updates on amd64 and sparc64; othersPhilip Guenther
to follow. While here add some gcc __predict hints. Much discussion with and assistance from miod and deraadt ok deraadt@
2015-07-26Copy relocations can't be jump-slot relocations, so delete the test for that.Philip Guenther
ok miod@
2014-12-22Introduce new csu0 variant for -static -pie binaries to use calledKurt Miller
rcsu0.o where the initial 'r' is for relocatable. rcsu0.o performs self-relocation on static pie binaries by calling a slightly modified copy of ld.so's _dl_boot_bind() in boot.h. The first arch implementatation is also included for amd64 where __start calls _dl_boot_bind() and then calls ___start(). Includes parts from kettenis@ to help get R_X86_64_64 relocations working and proper handling for undefined weak symbols. This is the first part of several to get static pie self-relocating binaries working. binutils, gcc and kernel changes are forthcoming to complete the solution, then per-arch implementations are needed for MD_RCRT0_START in csu. okay kettenis@ pascal@ deraadt@
2014-09-01Sync readlink(2) with IEEE Std 1003.1-2008.Doug Hogan
discussion, help and ok guenther@
2014-07-14Now that we have sendsyslog(2), we can directly use it in theTheo de Raadt
(previously completely retarded) stack_smash_handler of ld.so ok beck miod tedu
2014-07-09_dl_fcntl() is no longer used; kill the stubsPhilip Guenther
ok otto@ miod@
2014-07-09Fix backtraces through _dl_bind_start by adding dwarf annotations forPhilip Guenther
the stack adjustments/handling in the asm. Based on FreeBSD. ok kettenis@ matthew@
2014-07-06move from sysclt(KERN_ARND) to getentropy(2); ok miod@, kettenis@Otto Moerbeek
2014-07-05Mark _dl_exit __dead.Miod Vallat
2014-05-25Appease LLVM warnings..Brad Smith
error: shift count >= width of type [-Werror,-Wshift-count-overflow] Rework the ld.so relocation mask initialization. Clang complained about the shift code in the old versions of these, so improve the code. From drahn Bitrig ok miod@
2014-01-19Only i386 needs mquery; delete the static inlines from amd64 and hppaPhilip Guenther
2013-12-23Make ld.so pass its cleanup handler in %rdx as required by the AMD64 System VMark Kettenis
ABI, and stop calling atexit(4) directly from ld.so on amd64. Note that this means that binaries built before the middle of november may no longer call destructors in shared libraries implemented in C++. Update your packages! ok guenther@
2013-08-13Switch time_t, ino_t, clock_t, and struct kevent's ident and dataPhilip Guenther
members to 64bit types. Assign new syscall numbers for (almost all) the syscalls that involve the affected types, including anything with time_t, timeval, itimerval, timespec, rusage, dirent, stat, or kevent arguments. Add a d_off member to struct dirent and replace getdirentries() with getdents(), thus immensely simplifying and accelerating telldir/seekdir. Build perl with -DBIG_TIME. Bump the major on every single base library: the compat bits included here are only good enough to make the transition; the T32 compat option will be burned as soon as we've reached the new world are are happy with the snapshots for all architectures. DANGER: ABI incompatibility. Updating to this kernel requires extra work or you won't be able to login: install a snapshot instead. Much assistance in fixing userland issues from deraadt@ and tedu@ and build assistance from todd@ and otto@
2013-06-13Appease LLVM warning..Brad Smith
error: indirection of non-volatile null pointer will be deleted, not trap [-Werror,-Wnull-dereference] Suggestion from matthew@ Ok matthew@ miod@
2013-06-09Constify the mib argument of sysctl().Miod Vallat
ok matthew@ millert@
2013-06-01Make all the syscall prototypes consistent with their real forms for types,Philip Guenther
whitespace, and no argument names. ok matthew@ deraadt@
2013-06-01Introduce ltrace(1). This tool works with ld.so to inject utrace record forMiod Vallat
each plt call, allowing to trace a binary linked against shared library at the public function call level. To do so, ltrace(1) sets up some environment variables to enable plt tracing in ld.so, and invokes ktrace(2) for utrace events. ld.so will force lazy binding and will send an utrace record in the plt resolver, without updating the plt. Minimal filtering capabilities are provided, inspired by Solaris' truss -u, to limit tracing to libraries and/or symbol names. Non-traced libraries and symbols will have the regular resolver processing, with the expected plt update. "Get it in" deraadt
2013-05-08Implement symbol caching and RELACOUNT/RELCOUNT optimizations.Philip Guenther
Much assistance and testing by miod ok miod@
2013-04-05- Add ORIGIN, OSNAME, OSREL and PLATFORM substitution support for rpaths.Kurt Miller
Improvements and okay matthew@, millert@, guenther@
2013-03-18Fix comment tpyosPhilip Guenther
2012-12-05Remove excessive sys/cdefs.h inclusionTheo de Raadt
ok guenther millert kettenis
2012-10-24Garbage-collect the _dl_stat() routine, now unusedPhilip Guenthe
ok matthew@ deraadt@
2012-10-22Zero %rdx before transferring control to the main program, to indicate thatMark Kettenis
the main program should not register a cleanup handler with atexit(3). This will allow us to add the cleanup handler registration code to crt0.c and have ld.so pass its cleanup handler to the main program in the future. ok kurt@
2011-07-23Properly align the stack early on in the ld.so startup code such that code runMark Kettenis
from .init that uses SSE doesn't randomly trigger SIGBUS. ok drahn@, miod@
2011-04-06Avoid using NULL in non-pointer contexts: use 0 for integer values and '\0'Miod Vallat
for chars.
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