Florian Weimer ea85e7d550 elf: Restore support for _r_debug interpositions and copy relocations ... The changes in commit a93d9e03a3 ("Extend struct r_debug to support multiple namespaces [BZ #15971]") break the dyninst dynamic instrumentation tool. It brings its own definition of _r_debug (rather than a declaration). Furthermore, it turns out it is rather hard to use the proposed handshake for accessing _r_debug via DT_DEBUG. If applications want to access _r_debug, they can do so directly if the relevant code has been built as PIC. To protect against harm from accidental copy relocations due to linker relaxations, this commit restores copy relocation support by adjusting both copies if interposition or copy relocations are in play. Therefore, it is possible to use a hidden reference in ld.so to access _r_debug. Only perform the copy relocation initialization if libc has been loaded. Otherwise, the ld.so search scope can be empty, and the lookup of the _r_debug symbol mail fail. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>		2025-07-05 20:15:12 +02:00
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net	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
netinet	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
nfs	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
sys	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
Makefile	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
_G_config.h	…
_itoa.h	elf: Canonicalize $ORIGIN in an explicit ld.so invocation [BZ 25263]	2025-03-13 16:50:16 -03:00
a.out.h	…
abort-instr.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
adaptive_spin_count.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
aio_misc.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
allocalim.h	…
arch-fd_to_filename.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
asm-syntax.h	…
atomic-machine.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
c++-types.data	…
calloc-clear-memory.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
confstr.h	…
crti.S	…
crtn.S	…
device-nrs.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dirstream.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-affinity.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-audit-check.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-auxv.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-cache.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-call_tls_init_tp.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-debug.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-dtprocnum.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-dtv.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-execve.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-extra_tls.h	Add generic 'extra TLS'	2025-01-10 20:19:28 +00:00
dl-fcntl.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-fileid.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-fixup-attribute.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-hash.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-hwcap-check.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-irel.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-isa-level.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-lookupcfg.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-machine-rel.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-machine.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-minimal-malloc.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-mman.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-new-hash.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-osinfo.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-procinfo.c	…
dl-procruntime.c	…
dl-prop.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-protected.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-r_debug.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-relocate-ld.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-symbol-redir-ifunc.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-sysdep.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-tls.h	elf: Always define TLS_TP_OFFSET	2025-01-09 19:30:44 +01:00
dl-tunables-parse.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-unistd.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-vdso-setup.c	…
dl-vdso-setup.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dl-vdso.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
dwarf2.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
elf-initfini.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
elf-read-prop.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
elf_machine_sym_no_match.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
elide.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
entry.h	…
errqueue.h	…
fast-jitter.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
fd_to_filename.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
features-time64.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
fenv_private.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
fix-float-double-convert-nan.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
fix-fp-int-compare-invalid.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
fix-fp-int-convert-overflow.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
fix-int-fp-convert-zero.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
float128-abi.h	…
fork.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
fpu_control.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
framestate.c	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
gcc-compat.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
gccframe.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
get-rounding-mode.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
getrandom-internal.h	generic: Add missing parameter name to __getrandom_early_init	2025-05-28 10:00:41 +02:00
gmp-mparam.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
hp-timing-common.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
hp-timing.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
ifreq.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
ifunc-init.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
ifunc-sel.h	…
internal-signals.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
internal-sigset.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
intr-msg.h	…
ld.abilist	…
ldbl-classify-compat.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
ldconfig.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
ldsodefs.h	elf: Restore support for _r_debug interpositions and copy relocations	2025-07-05 20:15:12 +02:00
libBrokenLocale.abilist	…
libanl.abilist	…
libc-lock-arch.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
libc-lock.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
libc-mmap.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
libc-mtag.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
libc-start.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
libc-symver.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
libc.abilist	…
libc_malloc_debug.abilist	…
libc_start_call_main.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
libdl.abilist	…
libm-alias-double.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
libm-alias-float.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
libm-alias-float128.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
libm-alias-ldouble.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
libm.abilist	…
libnsl.abilist	…
libnss_compat.abilist	…
libnss_db.abilist	…
libnss_dns.abilist	…
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libpthread.abilist	…
libresolv.abilist	…
librt.abilist	…
libutil.abilist	…
link_map.h	…
linkmap.h	…
local-setxid.h	…
localplt.data	…
machine-gmon.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
machine-lock.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
machine-sp.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
malloc-alignment.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
malloc-hugepages.c	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
malloc-hugepages.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
malloc-machine.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
malloc-size.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
malloc-sysdep.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math-barriers.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math-nan-payload-double.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math-nan-payload-float.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math-narrow-alias-float128.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math-narrow-alias.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math-tests-arch.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math-tests-exceptions.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math-tests-rounding.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math-tests-snan-cast.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math-tests-snan-payload.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math-tests-snan.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math-tests-trap-force.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math-tests-trap.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math-tests.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math-type-macros-double.h	Implement C23 pown	2025-03-27 10:44:44 +00:00
math-type-macros-float.h	Implement C23 pown	2025-03-27 10:44:44 +00:00
math-type-macros-float128.h	Implement C23 pown	2025-03-27 10:44:44 +00:00
math-type-macros-ldouble.h	Implement C23 pown	2025-03-27 10:44:44 +00:00
math-type-macros.h	Implement C23 pown	2025-03-27 10:44:44 +00:00
math-use-builtins-ceil.h	…
math-use-builtins-copysign.h	…
math-use-builtins-fabs.h	…
math-use-builtins-ffs.h	…
math-use-builtins-floor.h	…
math-use-builtins-fma.h	…
math-use-builtins-fmax.h	…
math-use-builtins-fmin.h	…
math-use-builtins-llrint.h	…
math-use-builtins-logb.h	…
math-use-builtins-lrint.h	…
math-use-builtins-nearbyint.h	…
math-use-builtins-rint.h	…
math-use-builtins-round.h	…
math-use-builtins-roundeven.h	…
math-use-builtins-sqrt.h	…
math-use-builtins-trunc.h	…
math-use-builtins.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math_ldbl.h	…
math_ldbl_opt.h	…
math_private.h	…
math_private_calls.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math_uint128.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
memcopy.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
memswap.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
min-eloop-threshold.h	Remove eloop-threshold.h	2025-03-21 15:46:48 -03:00
mmap_info.h	…
mremap-failure.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
nan-high-order-bit.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
not-cancel.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
not-errno.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
nscd-types.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
pagecopy.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
paths.h	…
pointer_guard.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
profil-counter.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
pty-private.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
rtld-lowlevel.h	…
rtld_static_init.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
safe-fatal.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
set-freeres-fp.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
set-freeres-os.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
set-freeres-system.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
set-hooks-arch.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
setjmpP.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
setvmaname.h	ld.so: Decorate BSS mappings	2025-01-30 10:16:37 -03:00
sigcontextinfo.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
siglist-compat-def.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
siglist.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
sigset-cvt-mask.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
sigsetops.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
single-thread.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
spawn_int_def.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
stackguard-macros.h	…
stackinfo.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
stap-probe-machine.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
startup.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
stdio-lock.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
string-fza.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
string-fzb.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
string-fzc.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
string-fzi.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
string-misc.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
string-opthr.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
string-optype.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
string-shift.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
struct_stat_time64.h	…
symbol-hacks.h	…
syscall_types.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
sysdep-cancel.h	…
sysdep.h	S390: Use cfi_val_offset instead of cfi_escape.	2025-05-14 10:35:55 +02:00
thread_pointer.h	Move <thread_pointer.h> to kernel-independent sysdeps directories	2025-01-09 19:30:16 +01:00
thread_state.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
time-clockid.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
time64-compat.h	…
tininess.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
tls-internal-struct.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
tls-internal.c	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
tls-internal.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
tls-setup.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
tls.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
tst-audit.h	…
tst-file-align.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
tst-stack-align.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
unsecvars.h	…
unwind-arch.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
unwind-dw2-fde-glibc.c	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
unwind-dw2-fde.c	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
unwind-dw2-fde.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
unwind-dw2.c	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
unwind-link.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
unwind-pe.c	…
unwind-pe.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
unwind-resume.c	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
unwind-resume.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
unwind.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
utmp-equal.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
utmp-size.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
xstatver.h	…