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glibc/sysdeps/generic
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Maciej W. Rozycki b6084a958f Treat STV_HIDDEN and STV_INTERNAL symbols as STB_LOCAL 
In a reference to PR ld/19908 make ld.so respect symbol export classes
aka visibility and treat STV_HIDDEN and STV_INTERNAL symbols as local,
preventing such symbols from preempting exported symbols.

According to the ELF gABI[1] neither STV_HIDDEN nor STV_INTERNAL symbols
are supposed to be present in linked binaries:

"A hidden symbol contained in a relocatable object must be either
removed or converted to STB_LOCAL binding by the link-editor when the
relocatable object is included in an executable file or shared object."

"An internal symbol contained in a relocatable object must be either
removed or converted to STB_LOCAL binding by the link-editor when the
relocatable object is included in an executable file or shared object."

however some GNU binutils versions produce such symbols in some cases.
PR ld/19908 is one and we also have this note in scripts/abilist.awk:

so clearly there is linked code out there which contains such symbols
which is prone to symbol table misinterpretation, and it'll be more
productive if we handle this gracefully, under the Robustness Principle:
"be liberal in what you accept, and conservative in what you produce",
especially as this is a simple (STV_HIDDEN|STV_INTERNAL) => STB_LOCAL
mapping.

References:

[1] "System V Application Binary Interface - DRAFT - 24 April 2001",
    The Santa Cruz Operation, Inc., "Symbol Table",
    <http://www.sco.com/developers/gabi/2001-04-24/ch4.symtab.html>

	* sysdeps/generic/ldsodefs.h
	(dl_symbol_visibility_binds_local_p): New inline function.
	* elf/dl-addr.c (determine_info): Treat hidden and internal
	symbols as local.
	* elf/dl-lookup.c (do_lookup_x): Likewise.
	* elf/dl-reloc.c (RESOLVE_MAP): Likewise.
2016-07-01 23:48:52 +01:00
..
net Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
netinet Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
nfs Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sys Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
_G_config.h
_itoa.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
a.out.h
abort-instr.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
aio_misc.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
allocalim.h
asm-syntax.h
atomic-machine.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
c++-types.data
confstr.h
device-nrs.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dirstream.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-cache.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-dtprocnum.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-dtv.h elf: Consolidate machine-agnostic DTV definitions in <dl-dtv.h> 2016-06-20 14:31:40 +02:00
dl-fcntl.h hurd: Do not hide rtld symbols which need to be preempted 2016-03-20 19:51:42 +01:00
dl-fileid.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-fptr.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
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dl-irel.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-librecon.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-lookupcfg.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-machine.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-mman.h Update copyright dates committed in 2016 2016-01-06 14:03:10 -08:00
dl-osinfo.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-procinfo.c
dl-procinfo.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-sysdep.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-tls.h
dl-unistd.h Update copyright dates committed in 2016 2016-01-06 14:03:10 -08:00
dwarf2.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
elide.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
eloop-threshold.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
entry.h
errqueue.h
exit-thread.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
fd_to_filename.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
fips-private.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
fix-fp-int-convert-overflow.h S/390: Do not raise inexact exception in lrint/lround. [BZ #19486] 2016-01-18 12:48:06 +01:00
fix-int-fp-convert-zero.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
fork.h
fpu_control.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
frame.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
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gccframe.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
get-rounding-mode.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
gmp-mparam.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
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ifunc-sel.h
intr-msg.h
inttypes.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
ld.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
ldconfig.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
ldsodefs.h Treat STV_HIDDEN and STV_INTERNAL symbols as STB_LOCAL 2016-07-01 23:48:52 +01:00
libanl.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libBrokenLocale.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libc-lock.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
libc-mmap.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
libc-tsd.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
libc.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libcidn.abilist
libcrypt.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libdl.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libm-test-ulps
libm.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libnsl.abilist Add placeholder libnsl.abilist and libutil.abilist files 2016-03-07 00:49:36 +01:00
libnss_compat.abilist
libnss_db.abilist
libnss_dns.abilist
libnss_files.abilist
libnss_hesiod.abilist
libnss_nis.abilist
libnss_nisplus.abilist
libpthread.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libresolv.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
librt.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libutil.abilist Add placeholder libnsl.abilist and libutil.abilist files 2016-03-07 00:49:36 +01:00
linkmap.h Rename bits/linkmap.h to linkmap.h (bug 14912). 2015-09-04 19:44:27 +00:00
local-setxid.h
localplt.data
machine-gmon.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
machine-lock.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
machine-sp.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
Makefile Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
malloc-machine.h malloc: Remove NO_THREADS 2016-02-19 17:07:45 +01:00
malloc-sysdep.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
math_ldbl_opt.h
math_ldbl.h
math_private.h Fix clog, clog10 inaccuracy (bug 19016). 2015-09-28 22:11:22 +00:00
math-tests-arch.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
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paths.h
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rtld-lowlevel.h
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stackguard-macros.h
stackinfo.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
stdint.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
stdio-lock.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
string_private.h Add _STRING_INLINE_unaligned and string_private.h 2016-02-18 14:55:29 -02:00
symbol-hacks.h
sysdep-cancel.h
sysdep.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
thread_state.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tininess.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tls-macros.h
tls.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-audit.h
tst-stack-align.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
unsecvars.h
unwind-dw2-fde-glibc.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
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unwind-pe.c
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