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de38b2a343
glibc/sysdeps/i386
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Fangrui Song de38b2a343 elf: Remove ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA 
If an executable has copy relocations for extern protected data, that
can only work if the library containing the definition is built with
assumptions (a) the compiler emits GOT-generating relocations (b) the
linker produces R_*_GLOB_DAT instead of R_*_RELATIVE.  Otherwise the
library uses its own definition directly and the executable accesses a
stale copy.  Note: the GOT relocations defeat the purpose of protected
visibility as an optimization, but allow rtld to make the executable and
library use the same copy when copy relocations are present, but it
turns out this never worked perfectly.

ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA has strange semantics when both
a.so and b.so define protected var and the executable copy relocates
var: b.so accesses its own copy even with GLOB_DAT.  The behavior change
is from commit 62da1e3b00 (x86) and then
copied to nios2 (ae5eae7cfc) and arc
(0e7d930c4c).

Without ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA, b.so accesses the copy
relocated data like a.so.

There is now a warning for copy relocation on protected symbol since
commit 7374c02b68.  It's extremely
unlikely anyone relies on the ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA
behavior, so let's remove it: this removes a check in the symbol lookup
code.
2022-06-15 11:29:55 -07:00
..
fpu math: Add math-use-builtins-fabs (BZ#29027) 2022-05-23 17:49:18 -03:00
htl Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
i586 i686: Remove bzero optimizations 2022-02-23 14:18:18 -03:00
i686 Add bounds check to __libc_ifunc_impl_list 2022-06-10 17:13:29 +01:00
i786
nptl Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
sys Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
____longjmp_chk.S
__longjmp.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
abort-instr.h
add_n.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
addmul_1.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
asm-syntax.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
backtrace.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
bsd-_setjmp.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
bsd-setjmp.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
configure grep: egrep -> grep -E, fgrep -> grep -F 2022-06-05 12:09:02 -07:00
configure.ac x86/configure.ac: Define PI_STATIC_AND_HIDDEN/SUPPORT_STATIC_PIE 2022-02-14 07:34:54 -08:00
crti.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
crtn.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-fixup-attribute.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-irel.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-machine-rel.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-machine.h elf: Remove ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA 2022-06-15 11:29:55 -07:00
dl-procinfo.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-tls.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-tlsdesc.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-tlsdesc.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-trampoline.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
ffs.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
gccframe.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
htonl.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
htons.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
i386-mcount.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
Implies Add float128 support for x86_64, x86. 2017-06-26 22:02:24 +00:00
isa.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
jmpbuf-offsets.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
jmpbuf-unwind.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
link-defines.sym elf: Remove Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) 2021-10-11 11:14:02 -07:00
lshift.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
machine-gmon.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
Makefile mcheck: Align struct hdr to MALLOC_ALIGNMENT bytes [BZ #28068] 2021-07-12 18:13:32 -07:00
malloc-alignment.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
memchr.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
memcmp.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
memcopy.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
memcpy_chk.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
memcpy.S i386: Remove bcopy optimizations 2022-02-23 14:06:49 -03:00
memmove_chk.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
memmove.S
mempcpy_chk.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
mempcpy.S
memset_chk.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
memset.S i686: Remove bzero optimizations 2022-02-23 14:18:18 -03:00
mp_clz_tab.c
mul_1.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
preconfigure
pthread_spin_trylock.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
rawmemchr.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
rshift.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
setfpucw.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
setjmp.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
stackguard-macros.h
stackinfo.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
start.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
stpcpy.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
stpncpy.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
strcat.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
strchr.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
strchrnul.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
strcspn.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
string-inlines.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
strlen.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
strlen.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
strpbrk.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
strrchr.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
strspn.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
sub_n.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
submul_1.S Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
symbol-hacks.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
sysdep.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
tlsdesc.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
tlsdesc.sym
tst-audit3.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
tst-audit3.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
tst-audit.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
tst-auditmod3a.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
tst-auditmod3b.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
tst-ld-sse-use.sh grep: egrep -> grep -E, fgrep -> grep -F 2022-06-05 12:09:02 -07:00
unwind-arch.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
Versions Move __fentry__ version definition to sysdeps/{i386,x86_64} 2018-08-10 09:07:44 +02:00