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2021-02-25Reduce the statically linked startup code [BZ #23323]Florian Weimer
It turns out the startup code in csu/elf-init.c has a perfect pair of ROP gadgets (see Marco-Gisbert and Ripoll-Ripoll, "return-to-csu: A New Method to Bypass 64-bit Linux ASLR"). These functions are not needed in dynamically-linked binaries because DT_INIT/DT_INIT_ARRAY are already processed by the dynamic linker. However, the dynamic linker skipped the main program for some reason. For maximum backwards compatibility, this is not changed, and instead, the main map is consulted from __libc_start_main if the init function argument is a NULL pointer. For statically linked binaries, the old approach based on linker symbols is still used because there is nothing else available. A new symbol version __libc_start_main@@GLIBC_2.34 is introduced because new binaries running on an old libc would not run their ELF constructors, leading to difficult-to-debug issues.
2021-01-02Update copyright dates with scripts/update-copyrightsPaul Eggert
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 6694 files FOO. I then removed trailing white space from benchtests/bench-pthread-locks.c and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this diagnostic from Savannah: remote: *** pre-commit check failed ... remote: *** error: lines with trailing whitespace found remote: error: hook declined to update refs/heads/master
2020-02-18Introduce <elf-initfini.h> and ELF_INITFINI for all architecturesFlorian Weimer
This supersedes the init_array sysdeps directory. It allows us to check for ELF_INITFINI in both C and assembler code, and skip DT_INIT and DT_FINI processing completely on newer architectures. A new header file is needed because <dl-machine.h> is incompatible with assembler code. <sysdep.h> is compatible with assembler code, but it cannot be included in all assembler files because on some architectures, it redefines register names, and some assembler files conflict with that. <elf-initfini.h> is replicated for legacy architectures which need DT_INIT/DT_FINI support. New architectures follow the generic default and disable it.
2020-01-01Update copyright dates with scripts/update-copyrights.Joseph Myers
2019-09-07Prefer https to http for gnu.org and fsf.org URLsPaul Eggert
Also, change sources.redhat.com to sourceware.org. This patch was automatically generated by running the following shell script, which uses GNU sed, and which avoids modifying files imported from upstream: sed -ri ' s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g ' \ $(find $(git ls-files) -prune -type f \ ! -name '*.po' \ ! -name 'ChangeLog*' \ ! -path COPYING ! -path COPYING.LIB \ ! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \ ! -path manual/texinfo.tex ! -path scripts/config.guess \ ! -path scripts/config.sub ! -path scripts/install-sh \ ! -path scripts/mkinstalldirs ! -path scripts/move-if-change \ ! -path INSTALL ! -path locale/programs/charmap-kw.h \ ! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \ ! '(' -name configure \ -execdir test -f configure.ac -o -f configure.in ';' ')' \ ! '(' -name preconfigure \ -execdir test -f preconfigure.ac ';' ')' \ -print) and then by running 'make dist-prepare' to regenerate files built from the altered files, and then executing the following to cleanup: chmod a+x sysdeps/unix/sysv/linux/riscv/configure # Omit irrelevant whitespace and comment-only changes, # perhaps from a slightly-different Autoconf version. git checkout -f \ sysdeps/csky/configure \ sysdeps/hppa/configure \ sysdeps/riscv/configure \ sysdeps/unix/sysv/linux/csky/configure # Omit changes that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines git checkout -f \ sysdeps/powerpc/powerpc64/ppc-mcount.S \ sysdeps/unix/sysv/linux/s390/s390-64/syscall.S # Omit change that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-01-01Update copyright dates with scripts/update-copyrights.Joseph Myers
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
2018-01-01Update copyright dates with scripts/update-copyrights.Joseph Myers
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
2017-01-01Update copyright dates with scripts/update-copyrights.Joseph Myers
2016-01-04Update copyright dates with scripts/update-copyrights.Joseph Myers
2015-01-02Update copyright dates with scripts/update-copyrights.Joseph Myers
2014-01-01Update copyright notices with scripts/update-copyrightsAllan McRae
2013-03-12Add sysdeps/init_array to produce empty crt[in].o and use .preinit_array for ↵Roland McGrath
gcrt1.o
2013-01-02Update copyright notices with scripts/update-copyrights.Joseph Myers
2012-08-21Support static IFUNC calls irrespective of USE_MULTIARCH.Roland McGrath
2012-02-09Replace FSF snail mail address with URLs.Paul Eggert
2011-07-10Comment typo fix.Roland McGrath
2009-11-24Fix startup to security-relevant statically linked binaries.Ulrich Drepper
Before the change they crash on startup. Perform IREL relocations earlier to prevent this.
2009-10-13Fix USE_MULTIARCH conditionalAndreas Schwab
2009-06-05Fix build problems with old binutils.Ulrich Drepper
Old binutils don't provide IFUNC and don't generate the section start/end symbols we expect. At least for now only add the initializer code for static IFUNC relocations if multi-arch support is requested.
2009-05-31Finish IFUNC support for x86 and x86-64.Ulrich Drepper
Add support for the IRELAIVE relocation and IFUNC in static executables.
2005-11-05* configure.in: If init_array/fini_array support is not available,Ulrich Drepper
bail out. * config.h.in: Remove trace of optional init_array/fini_array support. * config.make.in: Likewise. * csu/elf-init.c: Likewise. * dlfcn/dlfcn.c: Likewise. * elf/soinit.c: Likewise. * sysdeps/ia64/elf/initfinit.c: Likewise.
2005-07-07[BZ #974]Ulrich Drepper
2005-04-13 H.J. Lu <hongjiu.lu@intel.com> [BZ #974] * csu/elf-init.c (__preinit_array_start): Take int, char **, char **. (__preinit_array_end): Likewise. (__init_array_start): Likewise. (__init_array_end): Likewise. (__libc_csu_init): Take int argc, char **argv, char **envp. Call preinit_array and init_array with argc, argv, envp. * sysdeps/generic/libc-start.c (LIBC_START_MAIN): Remove INIT_MAIN_ARGS. * sysdeps/powerpc/elf/libc-start.c (INIT_MAIN_ARGS): Removed. * elf/Makefile (distribute): Add tst-array5.c, tst-array5-static.c, tst-array5dep.c, and tst-array5.exp. (tests): Add tst-array5. (tests-static): Add tst-array5-static. ($(objpfx)tst-array5): New target. ($(objpfx)tst-array5.out): Likewise. ($(objpfx)tst-array5-static.out): Likewise. * elf/tst-array5-static.c: New file. * elf/tst-array5-static.exp: Likewise. * elf/tst-array5.c: Likewise. * elf/tst-array5.exp: Likewise. * elf/tst-array5dep.c: Likewise.
2005-07-05(__libc_csu_fini): Pretty printing.Ulrich Drepper
2005-02-14* csu/elf-init.c (__libc_csu_fini): Enable if LIBC_NONSHAREDUlrich Drepper
isn't defined. * sysdeps/generic/libc-start.c (LIBC_START_MAIN): Call fini if SHARED isn't defined. * elf/Makefile (tests-static): Add tst-array1-static. ($(objpfx)tst-array1-static.out): New target. * elf/tst-array1-static.c: New file.
2005-01-06* csu/elf-init.c (__libc_csu_fini): Don't do anything here. Ulrich Drepper
* sysdeps/generic/libc-start.c: Don't register program destructor here. * dlfcn/Makefile: Add rules to build dlfcn.c. (LDFLAGS-dl.so): Removed. * dlfcn/dlclose.c: _dl_close is now in ld.so, use function pointer table. * dlfcn/dlmopen.c: Likewise for _dl_open. * dlfcn/dlopen.c: Likewise. * dlfcn/dlopenold.c: Likewise. * elf/dl-libc.c: Likewise for _dl_open and _dl_close. * elf/Makefile (routines): Remove dl-open and dl-close. (dl-routines): Add dl-open, dl-close, and dl-trampoline. Add rules to build and run tst-audit1. * elf/tst-audit1.c: New file. * elf/tst-auditmod1.c: New file. * elf/Versions [libc]: Remove _dl_open and _dl_close. * elf/dl-close.c: Change for use inside ld.so instead of libc.so. * elf/dl-open.c: Likewise. * elf/dl-debug.c (_dl_debug_initialize): Allow reinitialization, signaled by nonzero parameter. * elf/dl-init.c: Fix use of r_state. * elf/dl-load.c: Likewise. * elf/dl-close.c: Add auditing checkpoints. * elf/dl-open.c: Likewise. * elf/dl-fini.c: Likewise. * elf/dl-load.c: Likewise. * elf/dl-sym.c: Likewise. * sysdeps/generic/libc-start.c: Likewise. * elf/dl-object.c: Allocate memory for auditing information. * elf/dl-reloc.c: Remove RESOLV. We now always need the map. Correctly initialize slotinfo. * elf/dynamic-link.h: Adjust after removal of RESOLV. * sysdeps/hppa/dl-lookupcfg.h: Likewise. * sysdeps/ia64/dl-lookupcfg.h: Likewise. * sysdeps/powerpc/powerpc64/dl-lookupcfg.h: Removed. * elf/dl-runtime.c (_dl_fixup): Little cleanup. (_dl_profile_fixup): New parameters to point to register struct and variable for frame size. Add auditing checkpoints. (_dl_call_pltexit): New function. Don't define trampoline code here. * elf/rtld.c: Recognize LD_AUDIT. Load modules on startup. Remove all the functions from _rtld_global_ro which only _dl_open and _dl_close needed. Add auditing checkpoints. * elf/link.h: Define symbols for auditing interfaces. * include/link.h: Likewise. * include/dlfcn.h: Define __RTLD_AUDIT. Remove prototypes for _dl_open and _dl_close. Adjust access to argc and argv in libdl. * dlfcn/dlfcn.c: New file. * sysdeps/generic/dl-lookupcfg.h: Remove all content now that RESOLVE is gone. * sysdeps/generic/ldsodefs.h: Add definitions for auditing interfaces. * sysdeps/generic/unsecvars.h: Add LD_AUDIT. * sysdeps/i386/dl-machine.h: Remove trampoline code here. Adjust for removal of RESOLVE. * sysdeps/x86_64/dl-machine.h: Likewise. * sysdeps/generic/dl-trampoline.c: New file. * sysdeps/i386/dl-trampoline.c: New file. * sysdeps/x86_64/dl-trampoline.c: New file. * sysdeps/generic/dl-tls.c: Cleanups. Fixup for dtv_t change. Fix updating of DTV. * sysdeps/generic/libc-tls.c: Likewise. * sysdeps/arm/bits/link.h: Renamed to ... * sysdeps/arm/buts/linkmap.h: ...this. * sysdeps/generic/bits/link.h: Renamed to... * sysdeps/generic/bits/linkmap.h: ...this. * sysdeps/hppa/bits/link.h: Renamed to... * sysdeps/hppa/bits/linkmap.h: ...this. * sysdeps/hppa/i386/link.h: Renamed to... * sysdeps/hppa/i386/linkmap.h: ...this. * sysdeps/hppa/ia64/link.h: Renamed to... * sysdeps/hppa/ia64/linkmap.h: ...this. * sysdeps/hppa/s390/link.h: Renamed to... * sysdeps/hppa/s390/linkmap.h: ...this. * sysdeps/hppa/sh/link.h: Renamed to... * sysdeps/hppa/sh/linkmap.h: ...this. * sysdeps/hppa/x86_64/link.h: Renamed to... * sysdeps/hppa/x86_64/linkmap.h: ...this. 2005-01-06 Ulrich Drepper <drepper@redhat.com> * allocatestack.c (init_one_static_tls): Adjust initialization of DTV entry for static tls deallocation fix. * sysdeps/alpha/tls.h (dtv_t): Change pointer type to be struct which also contains information whether the memory pointed to is static TLS or not. * sysdeps/i386/tls.h: Likewise. * sysdeps/ia64/tls.h: Likewise. * sysdeps/powerpc/tls.h: Likewise. * sysdeps/s390/tls.h: Likewise. * sysdeps/sh/tls.h: Likewise. * sysdeps/sparc/tls.h: Likewise. * sysdeps/x86_64/tls.h: Likewise.
2004-12-22(CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4.Ulrich Drepper
2007-07-122.5-18.1Jakub Jelinek
2004-08-16* csu/elf-init.c: Update copyright terms including special exceptionRoland McGrath
for these trivial files, which are statically linked into executables that use dynamic linking for the significant library code. * io/fstat.c: Likewise. * io/fstat64.c: Likewise. * io/lstat.c: Likewise. * io/lstat64.c: Likewise. * io/stat.c: Likewise. * io/stat64.c: Likewise. * stdlib/atexit.c: Likewise. * sysdeps/alpha/elf/initfini.c: Likewise. * sysdeps/alpha/elf/start.S: Likewise. * sysdeps/arm/elf/start.S: Likewise. * sysdeps/cris/elf/start.S: Likewise. * sysdeps/generic/initfini.c: Likewise. * sysdeps/generic/mknod.c: Likewise. * sysdeps/hppa/elf/initfini.c: Likewise. * sysdeps/hppa/elf/start.S: Likewise. * sysdeps/i386/elf/start.S: Likewise. * sysdeps/i386/i686/hp-timing.c: Likewise. * sysdeps/ia64/elf/initfini.c: Likewise. * sysdeps/ia64/elf/start.S: Likewise. * sysdeps/ia64/hp-timing.c: Likewise. * sysdeps/m68k/elf/start.S: Likewise. * sysdeps/mach/start.c: Likewise. * sysdeps/mips/elf/start.S: Likewise. * sysdeps/powerpc/powerpc32/elf/start.S: Likewise. * sysdeps/powerpc/powerpc64/elf/start.S: Likewise. * sysdeps/s390/s390-32/elf/start.S: Likewise. * sysdeps/s390/s390-32/initfini.c: Likewise. * sysdeps/s390/s390-64/elf/start.S: Likewise. * sysdeps/s390/s390-64/initfini.c: Likewise. * sysdeps/sh/elf/initfini.c: Likewise. * sysdeps/sh/elf/start.S: Likewise. * sysdeps/sparc/sparc32/elf/start.S: Likewise. * sysdeps/sparc/sparc32/sparcv9/hp-timing.c: Likewise. * sysdeps/sparc/sparc64/elf/start.S: Likewise. * sysdeps/sparc/sparc64/hp-timing.c: Likewise. * sysdeps/standalone/i386/start.S: Likewise. * sysdeps/standalone/i960/start.S: Likewise. * sysdeps/standalone/m68k/m68020/start.S: Likewise. * sysdeps/unix/arm/start.c: Likewise. * sysdeps/unix/bsd/osf/alpha/start.S: Likewise. * sysdeps/unix/bsd/ultrix4/mips/start.S: Likewise. * sysdeps/unix/sparc/start.c: Likewise. * sysdeps/unix/start.c: Likewise. * sysdeps/unix/sysv/aix/start.s: Likewise. * sysdeps/unix/sysv/irix4/start.c: Likewise. * sysdeps/x86_64/elf/initfini.c: Likewise. * sysdeps/x86_64/elf/start.S: Likewise.
2003-05-21Update.Ulrich Drepper
2003-05-21 Ulrich Drepper <drepper@redhat.com> * csu/elf-init.c: Mark __preinit_array_start, __preinit_array_end, __init_array_start, __init_array_end, __fini_array_start, and __fini_array_end as hidden.
2002-12-09* elf/Makefile (tests): Uncomment tst-array[123].Roland McGrath
* Makeconfig (CPPFLAGS-.oS): Add -DLIBC_NONSHARED=1. * csu/elf-init.c: New file. * csu/Makefile (routines, static-only-routines): Add elf-init. * sysdeps/alpha/elf/start.S: Use __libc_csu_init in place of _init and __libc_csu_fini in place of _fini. * sysdeps/arm/elf/start.S: Likewise. * sysdeps/cris/elf/start.S: Likewise. * sysdeps/hppa/elf/start.S: Likewise. * sysdeps/i386/elf/start.S: Likewise. * sysdeps/ia64/elf/start.S: Likewise. * sysdeps/m68k/elf/start.S: Likewise. * sysdeps/mach/hurd/powerpc/static-start.S: Likewise. * sysdeps/mips/elf/start.S: Likewise. * sysdeps/powerpc/powerpc32/elf/start.S: Likewise. * sysdeps/powerpc/powerpc64/elf/start.S: Likewise. * sysdeps/s390/s390-32/elf/start.S: Likewise. * sysdeps/s390/s390-64/elf/start.S: Likewise. * sysdeps/sh/elf/start.S: Likewise. * sysdeps/sparc/sparc32/elf/start.S: Likewise. * sysdeps/sparc/sparc64/elf/start.S: Likewise. * sysdeps/x86_64/elf/start.S: Likewise.
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