Florian Weimer 035c012e32 Reduce the statically linked startup code [BZ #23323] ... 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.		2021-02-25 12:13:02 +01:00
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net	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
netinet	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
nfs	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
sys	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
Makefile	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
_G_config.h	…
_itoa.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
a.out.h	…
abort-instr.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
adaptive_spin_count.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
aio_misc.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
allocalim.h	…
arch-fd_to_filename.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
asm-syntax.h	…
atomic-machine.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
c++-types.data	…
confstr.h	…
crti.S	…
crtn.S	…
device-nrs.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dirstream.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-auxv.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-cache.h	ldconfig/x86: Store ISA level in cache and aux cache	2021-01-13 05:51:17 -08:00
dl-dtprocnum.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-dtv.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-fcntl.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-fileid.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-fptr.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-hash.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-irel.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-isa-level.h	ldconfig/x86: Store ISA level in cache and aux cache	2021-01-13 05:51:17 -08:00
dl-librecon.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-lookupcfg.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-machine.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-mman.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-osinfo.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-procinfo.c	…
dl-procinfo.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-procruntime.c	…
dl-prop.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-sysdep.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-tls.h	…
dl-unistd.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-vdso-setup.c	…
dl-vdso-setup.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dl-vdso.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
dwarf2.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
elf-initfini.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
elf-read-prop.h	ldconfig/x86: Store ISA level in cache and aux cache	2021-01-13 05:51:17 -08:00
elf_machine_sym_no_match.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
elide.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
eloop-threshold.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
entry.h	…
errqueue.h	…
exit-thread.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
fd_to_filename.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
fenv_private.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
fips-private.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
fix-fp-int-compare-invalid.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
fix-fp-int-convert-overflow.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
fix-int-fp-convert-zero.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
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fork.h	…
fpu_control.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
framestate.c	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
gcc-compat.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
gccframe.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
get-rounding-mode.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
gmp-mparam.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
hp-timing-common.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
hp-timing.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
ifreq.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
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internal-signals.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
intr-msg.h	…
ld.abilist	…
ldbl-classify-compat.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
ldconfig.h	ldconfig/x86: Store ISA level in cache and aux cache	2021-01-13 05:51:17 -08:00
ldsodefs.h	Reduce the statically linked startup code [BZ #23323]	2021-02-25 12:13:02 +01:00
libBrokenLocale.abilist	…
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libc-lock.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
libc-mmap.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
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libc-start.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
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libm-alias-double.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
libm-alias-float.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
libm-alias-float128.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
libm-alias-ldouble.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
libm-test-ulps	…
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link_map.h	…
linkmap.h	…
local-setxid.h	…
localplt.data	…
machine-gmon.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
machine-lock.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
machine-sp.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
malloc-alignment.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
malloc-machine.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
malloc-sysdep.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
math-barriers.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
math-nan-payload-double.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
math-nan-payload-float.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
math-narrow-alias-float128.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
math-tests-arch.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
math-tests-exceptions.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
math-tests-rounding.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
math-tests-snan-cast.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
math-tests-snan-payload.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
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math-tests-trap-force.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
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math-tests.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
math-type-macros-double.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
math-type-macros-float.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
math-type-macros-float128.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
math-type-macros-ldouble.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
math-type-macros.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
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math-use-builtins.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
math_ldbl.h	…
math_ldbl_opt.h	…
math_private.h	ieee754: Remove unused __sin32 and __cos32	2020-12-18 12:10:31 +05:30
math_private_calls.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
memcopy.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
memusage.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
mmap_info.h	…
nan-high-order-bit.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
not-cancel.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
not-errno.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
nscd-types.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
pagecopy.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
paths.h	…
profil-counter.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
pty-private.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
register-dump.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
rtld-lowlevel.h	…
safe-fatal.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
setjmpP.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
sigcontextinfo.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
siglist-compat.c	…
siglist-compat.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
siglist.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
sigset-cvt-mask.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
sigsetops.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
single-thread.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
stackguard-macros.h	…
stackinfo.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
stap-probe-machine.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
startup.h	Use <startup.h> in __libc_init_secure	2021-01-19 09:55:47 -08:00
stdio-lock.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
string_private.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
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sysdep.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
thread_state.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
time-clockid.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
tininess.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
tls-internal-struct.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
tls-internal.c	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
tls-internal.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
tls-macros.h	…
tls-setup.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
tls.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
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unsecvars.h	…
unwind-arch.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
unwind-dw2-fde-glibc.c	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
unwind-dw2-fde.c	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
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unwind-dw2.c	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
unwind-pe.c	…
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unwind-resume.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
unwind.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
utmp-equal.h	Update copyright dates with scripts/update-copyrights	2021-01-02 12:17:34 -08:00
xstatver.h	…