Run check-localpltk/textrel/execstack over ld.so.

For maximum paranoia we run ld.so through the normal set
of tests for all of the shared libraries. This includes
running ld.so through check-localplt, check-textrel, and
check-execstack. While none of these should trigger any
failures given the way ld.so is built, it might possibly
fail if a developer does something wrong. This paranoia
was triggered by a discussion over the use of __strcpy
vs. strcpy [1] and if the symbol could leak and use the
libc.so version.

The check-localplt test fails right away because localplt.data
needs updating for all arches. By default we add 6 new symbols:
__tls_get_addr, __libc_memalign, malloc, calloc, realloc and
free. Other machines like i386, power, and s390 require some
different symbol sets e.g. ___tls_get_addr vs. __tls_get_addr
for i386.

Verified for i386
Verified for x86_64
Verified for ppc32
Verified for ppc64
Verified for ppc64le
Verified for arm
Verified for aarch64
Verified for s390
Verified for s390x
Guessed for alpha
Guessed for ia64
Guessed for m68k
Guessed for microblaze
Guessed for sparc32
Guessed for sparc64
Defaults for sh
Defaults for mips
Defaults for hppa
Defaults for tile

Machine manintainers notified to double check the data
used in localplt.data.

[1] https://sourceware.org/ml/libc-alpha/2014-10/msg00548.html

ChangeLog

@@ -1,3 +1,28 @@
+2014-11-06  Carlos O'Donell  <carlos@redhat.com>
+
+	* elf/Makefile (all-built-dso): Add $(common-objpfx)elf/ld.so.
+	(localplt-build-dso): Add elf/ld.so.
+	* sysdeps/unix/sysv/linux/i386/localplt.data: Add ___tls_get_addr
+	i.e. 3 underscore version, __libc_memalign, malloc, calloc, realloc,
+	and free for ld.so.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data: Add
+	__libc_memalign, malloc, calloc, realloc, and free for ld.so.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data:
+	Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data:
+	Likewise.
+	* sysdeps/unix/sysv/linux/s390/localplt.data: Likewise.
+	* sysdeps/generic/localplt.data: Add __tls_get_addr i.e. 2 underscore
+	version, __libc_memalign, malloc, calloc, realloc and free for ld.so.
+	* sysdeps/unix/sysv/linux/aarch64/localplt.data: Likewise.
+	* sysdeps/unix/sysv/linux/arm/localplt.data: Likewise.
+	* sysdeps/unix/sysv/linux/alpha/localplt.data: Likewise.
+	* sysdeps/unix/sysv/linux/ia64/localplt.data: Likewise.
+	* sysdeps/unix/sysv/linux/m68k/localplt.data: Likewise.
+	* sysdeps/unix/sysv/linux/microblaze/localplt.data: Likewise.
+	* sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data: Likewise.
+	* sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data: Likewise.
+
 2014-11-05  Joseph Myers  <joseph@codesourcery.com>
 
 	[BZ #14132]

elf/Makefile

@@ -904,7 +904,7 @@ CFLAGS-tst-pie2.c += $(pie-ccflag)
 $(objpfx)tst-pie1: $(objpfx)tst-piemod1.so
 
 ifeq (yes,$(build-shared))
-all-built-dso := $(common-objpfx)libc.so \
+all-built-dso := $(common-objpfx)elf/ld.so $(common-objpfx)libc.so \
 		 $(filter-out $(common-objpfx)linkobj/libc.so, \
 			      $(sort $(wildcard $(addprefix $(common-objpfx), \
 							    */lib*.so \
@@ -963,6 +963,7 @@ common-generated += $(all-built-dso:$(common-objpfx)%=%.jmprel)
 
 localplt-built-dso := $(addprefix $(common-objpfx),\
 				  libc.so \
+				  elf/ld.so \
 				  math/libm.so \
 				  rt/librt.so \
 				  dlfcn/libdl.so \

sysdeps/generic/localplt.data

@@ -7,3 +7,12 @@ libc.so: malloc
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
+# The dynamic loader needs __tls_get_addr for TLS, and uses __libc_memalign
+# internally to allocate aligned TLS storage. The other malloc family of
+# functions are expected to allow user symbol interposition.
+ld.so: __tls_get_addr
+ld.so: __libc_memalign
+ld.so: malloc
+ld.so: calloc
+ld.so: realloc
+ld.so: free

sysdeps/unix/sysv/linux/aarch64/localplt.data

@@ -12,3 +12,12 @@ libm.so: matherr
 libm.so: __signbit
 libm.so: __signbitf
 libm.so: __signbitl
+# The dynamic loader needs __tls_get_addr for TLS, and uses __libc_memalign
+# internally to allocate aligned TLS storage. The other malloc family of
+# functions are expected to allow user symbol interposition.
+ld.so: __tls_get_addr
+ld.so: __libc_memalign
+ld.so: malloc
+ld.so: calloc
+ld.so: realloc
+ld.so: free

sysdeps/unix/sysv/linux/alpha/localplt.data

@@ -24,3 +24,12 @@ libm.so: matherr
 # We used to offer inline functions that used this, so it must be exported.
 # Ought to reorg things such that carg isn't thus forced to use a plt.
 libm.so: __atan2
+# The dynamic loader needs __tls_get_addr for TLS, and uses __libc_memalign
+# internally to allocate aligned TLS storage. The other malloc family of
+# functions are expected to allow user symbol interposition.
+ld.so: __tls_get_addr
+ld.so: __libc_memalign
+ld.so: malloc
+ld.so: calloc
+ld.so: realloc
+ld.so: free

sysdeps/unix/sysv/linux/arm/localplt.data

@@ -11,3 +11,12 @@ libm.so: __signbitf
 libm.so: matherr
 libpthread.so: __errno_location
 libpthread.so: raise
+# The dynamic loader needs __tls_get_addr for TLS, and uses __libc_memalign
+# internally to allocate aligned TLS storage. The other malloc family of
+# functions are expected to allow user symbol interposition.
+ld.so: __tls_get_addr
+ld.so: __libc_memalign
+ld.so: malloc
+ld.so: calloc
+ld.so: realloc
+ld.so: free

sysdeps/unix/sysv/linux/i386/localplt.data

@@ -5,3 +5,14 @@ libc.so: malloc
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
+# The dynamic loader needs ___tls_get_addr for TLS, and uses __libc_memalign
+# internally to allocate aligned TLS storage. The other malloc family of
+# functions are expected to allow user symbol interposition.
+# Note that it is triple underscore for ___tls_get_addr e.g. the alternate
+# ABI.
+ld.so: ___tls_get_addr
+ld.so: __libc_memalign
+ld.so: malloc
+ld.so: calloc
+ld.so: realloc
+ld.so: free

sysdeps/unix/sysv/linux/ia64/localplt.data

@@ -6,3 +6,12 @@ libc.so: realloc
 libm.so: matherr
 libm.so: matherrf
 libm.so: matherrl
+# The dynamic loader needs __tls_get_addr for TLS, and uses __libc_memalign
+# internally to allocate aligned TLS storage. The other malloc family of
+# functions are expected to allow user symbol interposition.
+ld.so: __tls_get_addr
+ld.so: __libc_memalign
+ld.so: malloc
+ld.so: calloc
+ld.so: realloc
+ld.so: free

sysdeps/unix/sysv/linux/m68k/localplt.data

@@ -6,3 +6,12 @@ libc.so: malloc
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
+# The dynamic loader needs __tls_get_addr for TLS, and uses __libc_memalign
+# internally to allocate aligned TLS storage. The other malloc family of
+# functions are expected to allow user symbol interposition.
+ld.so: __tls_get_addr
+ld.so: __libc_memalign
+ld.so: malloc
+ld.so: calloc
+ld.so: realloc
+ld.so: free

sysdeps/unix/sysv/linux/microblaze/localplt.data

@@ -9,3 +9,12 @@ libm.so: __signbit
 libm.so: __signbitf
 libm.so: matherr
 libpthread.so: __errno_location
+# The dynamic loader needs __tls_get_addr for TLS, and uses __libc_memalign
+# internally to allocate aligned TLS storage. The other malloc family of
+# functions are expected to allow user symbol interposition.
+ld.so: __tls_get_addr
+ld.so: __libc_memalign
+ld.so: malloc
+ld.so: calloc
+ld.so: realloc
+ld.so: free

sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data

@@ -5,3 +5,11 @@ libc.so: malloc
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
+# The dynamic loader uses __libc_memalign internally to allocate aligned
+# TLS storage. The other malloc family of functions are expected to allow
+# user symbol interposition.
+ld.so: __libc_memalign
+ld.so: malloc
+ld.so: calloc
+ld.so: realloc
+ld.so: free

sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data

@@ -38,3 +38,11 @@ libm.so: __signbitl
 libm.so: copysignl ?
 libm.so: fabsl
 libm.so: matherr
+# The dynamic loader uses __libc_memalign internally to allocate aligned
+# TLS storage. The other malloc family of functions are expected to allow
+# user symbol interposition.
+ld.so: __libc_memalign
+ld.so: malloc
+ld.so: calloc
+ld.so: realloc
+ld.so: free

sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data

@@ -4,3 +4,11 @@ libc.so: malloc
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
+# The dynamic loader uses __libc_memalign internally to allocate aligned
+# TLS storage. The other malloc family of functions are expected to
+# allow user symbol interposition.
+ld.so: __libc_memalign
+ld.so: malloc
+ld.so: calloc
+ld.so: realloc
+ld.so: free

sysdeps/unix/sysv/linux/s390/localplt.data

@@ -5,3 +5,11 @@ libc.so: malloc
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
+# The dynamic loader uses __libc_memalign internally to allocate aligned
+# TLS storage. The other malloc family of functions are expected to allow
+# user symbol interposition.
+ld.so: __libc_memalign
+ld.so: malloc
+ld.so: calloc
+ld.so: realloc
+ld.so: free

sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data

@@ -15,3 +15,12 @@ libc.so: malloc
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
+# The dynamic loader needs __tls_get_addr for TLS, and uses __libc_memalign
+# internally to allocate aligned TLS storage. The other malloc family of
+# functions are expected to allow user symbol interposition.
+ld.so: __tls_get_addr
+ld.so: __libc_memalign
+ld.so: malloc
+ld.so: calloc
+ld.so: realloc
+ld.so: free

sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data

@@ -17,3 +17,12 @@ libc.so: malloc
 libc.so: memalign
 libc.so: realloc
 libm.so: matherr
+# The dynamic loader needs __tls_get_addr for TLS, and uses __libc_memalign
+# internally to allocate aligned TLS storage. The other malloc family of
+# functions are expected to allow user symbol interposition.
+ld.so: __tls_get_addr
+ld.so: __libc_memalign
+ld.so: malloc
+ld.so: calloc
+ld.so: realloc
+ld.so: free