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Do check-textrel test using readelf rather than a build-time C program.
This commit is contained in:
Roland McGrath
parent
615605c94e
commit
82a79e7d18
12
ChangeLog
12
ChangeLog
@ -1,3 +1,15 @@
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2012-05-01 Roland McGrath <roland@hack.frob.com>
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* scripts/check-textrel.awk: New file.
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* elf/Makefile ($(objpfx)check-textrel): Target removed.
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(check-textrel-CFLAGS): Variable removed.
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(all-built-dso): Use := to define.o
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($(all-built-dso:=.dyn)): New static pattern rule.
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(generated): Add those targets.
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($(objpfx)check-textrel.out): Use the script on the .dyn files.
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* config.make.in (READELF): New substituted variable.
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* elf/check-textrel.c: File removed.
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2012-05-01 Joseph Myers <joseph@codesourcery.com>
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* conform/data/assert.h-data [ISO || ISO99 || ISO11] (*_t): Do not
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@ -112,6 +112,7 @@ BISON = @BISON@
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AUTOCONF = @AUTOCONF@
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OBJDUMP = @OBJDUMP@
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OBJCOPY = @OBJCOPY@
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READELF = @READELF@
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# Installation tools.
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INSTALL = @INSTALL@
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27
elf/Makefile
27
elf/Makefile
@ -872,10 +872,6 @@ CFLAGS-tst-pie1.c += $(pie-ccflag)
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$(objpfx)tst-pie1: $(objpfx)tst-piemod1.so
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check-textrel-CFLAGS = -O -Wall -D_XOPEN_SOURCE=600 -D_BSD_SOURCE
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$(objpfx)check-textrel: check-textrel.c
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$(native-compile)
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check-execstack-CFLAGS = -O -Wall -D_XOPEN_SOURCE=600 -D_BSD_SOURCE -std=gnu99 \
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$(objpfx:%/=-I%)
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$(objpfx)check-execstack: check-execstack.c $(objpfx)check-execstack.h
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@ -895,14 +891,23 @@ $(objpfx)check-localplt: check-localplt.c
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ifeq (yes,$(build-shared))
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tests: $(objpfx)check-textrel.out $(objpfx)check-execstack.out
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all-built-dso = $(common-objpfx)libc.so \
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$(filter-out $(common-objpfx)linkobj/libc.so, \
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$(sort $(wildcard $(common-objpfx)*/lib*.so \
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$(common-objpfx)iconvdata/*.so)))
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all-built-dso := $(common-objpfx)libc.so \
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$(filter-out $(common-objpfx)linkobj/libc.so, \
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$(sort $(wildcard $(addprefix $(common-objpfx), \
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*/lib*.so \
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iconvdata/*.so))))
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$(objpfx)check-textrel.out: $(objpfx)check-textrel $(all-built-dso)
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$(dir $<)$(notdir $<) $(filter-out $<, $^) > $@
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generated += check-textrel check-textrel.out
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$(all-built-dso:=.dyn): %.dyn: %
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@rm -f $@T
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LC_ALL=C $(READELF) -W -d $< > $@T
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test -s $@T
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mv -f $@T $@
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generated += $(all-built-dso:=.dyn)
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$(objpfx)check-textrel.out: $(..)scripts/check-textrel.awk \
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$(all-built-dso:=.dyn)
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LC_ALL=C $(AWK) -f $^ > $@
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generated += check-textrel.out
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$(objpfx)check-execstack.out: $(objpfx)check-execstack $(all-built-dso)
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$(dir $<)$(notdir $<) $(filter-out $<, $^) > $@
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@ -1,198 +0,0 @@
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/* Check for text relocations in DSOs.
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Copyright (C) 2002, 2003, 2006 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contribute by Ulrich Drepper <drepper@redhat.com>. 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <byteswap.h>
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#include <elf.h>
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#include <endian.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#ifdef BITS
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# define AB(name) _AB (name, BITS)
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# define _AB(name, bits) __AB (name, bits)
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# define __AB(name, bits) name##bits
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# define E(name) _E (name, BITS)
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# define _E(name, bits) __E (name, bits)
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# define __E(name, bits) Elf##bits##_##name
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# define SWAP(val) \
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({ __typeof (val) __res; \
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if (((ehdr.e_ident[EI_DATA] == ELFDATA2MSB \
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&& BYTE_ORDER == LITTLE_ENDIAN) \
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|| (ehdr.e_ident[EI_DATA] == ELFDATA2LSB \
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&& BYTE_ORDER == BIG_ENDIAN)) \
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&& sizeof (val) != 1) \
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{ \
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if (sizeof (val) == 2) \
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__res = bswap_16 (val); \
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else if (sizeof (val) == 4) \
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__res = bswap_32 (val); \
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else \
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__res = bswap_64 (val); \
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} \
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else \
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__res = (val); \
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__res; })
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static int
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AB(handle_file) (const char *fname, int fd)
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{
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E(Ehdr) ehdr;
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if (pread (fd, &ehdr, sizeof (ehdr), 0) != sizeof (ehdr))
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{
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read_error:
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printf ("%s: read error: %m\n", fname);
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return 1;
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}
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const size_t phnum = SWAP (ehdr.e_phnum);
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const size_t phentsize = SWAP (ehdr.e_phentsize);
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/* Read the program header. */
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E(Phdr) *phdr = alloca (phentsize * phnum);
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if (pread (fd, phdr, phentsize * phnum, SWAP (ehdr.e_phoff))
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!= phentsize * phnum)
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goto read_error;
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/* Search for the PT_DYNAMIC entry. */
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size_t cnt;
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E(Phdr) *dynphdr = NULL;
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for (cnt = 0; cnt < phnum; ++cnt)
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if (SWAP (phdr[cnt].p_type) == PT_DYNAMIC)
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dynphdr = &phdr[cnt];
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else if (SWAP (phdr[cnt].p_type) == PT_LOAD
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&& (SWAP (phdr[cnt].p_flags) & (PF_X | PF_W)) == (PF_X | PF_W))
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{
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printf ("%s: segment %zu is executable and writable\n",
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fname, cnt);
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#if !defined __sparc__ \
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&& !defined __alpha__ \
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&& (!defined __powerpc__ || defined __powerpc64__ || defined HAVE_PPC_SECURE_PLT)
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/* sparc, sparc64, alpha and powerpc32 (the last one only when using
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-mbss-plt) are expected to have PF_X | PF_W segment containing .plt
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section, it is part of their ABI. It is bad security wise, nevertheless
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this test shouldn't fail because of this. */
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return 1;
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#endif
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}
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if (dynphdr == NULL)
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{
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printf ("%s: no DYNAMIC segment found\n", fname);
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return 1;
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}
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/* Read the dynamic segment. */
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size_t pmemsz = SWAP(dynphdr->p_memsz);
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E(Dyn) *dyn = alloca (pmemsz);
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if (pread (fd, dyn, pmemsz, SWAP(dynphdr->p_offset)) != pmemsz)
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goto read_error;
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/* Search for an DT_TEXTREL entry of DT_FLAGS with the DF_TEXTREL
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bit set. */
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for (cnt = 0; (cnt + 1) * sizeof (E(Dyn)) - 1 < pmemsz; ++cnt)
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{
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unsigned int tag = SWAP (dyn[cnt].d_tag);
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if (tag == DT_NULL)
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/* We reached the end. */
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break;
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if (tag == DT_TEXTREL
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|| (tag == DT_FLAGS
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&& (SWAP (dyn[cnt].d_un.d_val) & DF_TEXTREL) != 0))
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{
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/* Urgh! The DSO has text relocations. */
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printf ("%s: text relocations used\n", fname);
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return 1;
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}
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}
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printf ("%s: OK\n", fname);
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return 0;
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}
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# undef BITS
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#else
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# define BITS 32
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# include "check-textrel.c"
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# define BITS 64
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# include "check-textrel.c"
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static int
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handle_file (const char *fname)
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{
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int fd = open (fname, O_RDONLY);
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if (fd == -1)
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{
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printf ("cannot open %s: %m\n", fname);
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return 1;
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}
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/* Read was is supposed to be the ELF header. Read the initial
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bytes to determine whether this is a 32 or 64 bit file. */
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char ident[EI_NIDENT];
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if (read (fd, ident, EI_NIDENT) != EI_NIDENT)
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{
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printf ("%s: read error: %m\n", fname);
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close (fd);
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return 1;
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}
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if (memcmp (&ident[EI_MAG0], ELFMAG, SELFMAG) != 0)
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{
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printf ("%s: not an ELF file\n", fname);
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close (fd);
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return 1;
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}
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int result;
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if (ident[EI_CLASS] == ELFCLASS64)
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result = handle_file64 (fname, fd);
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else
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result = handle_file32 (fname, fd);
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close (fd);
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return result;
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}
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int
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main (int argc, char *argv[])
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{
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int cnt;
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int result = 0;
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for (cnt = 1; cnt < argc; ++cnt)
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result |= handle_file (argv[cnt]);
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return result;
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}
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#endif
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41
scripts/check-textrel.awk
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41
scripts/check-textrel.awk
Normal file
@ -0,0 +1,41 @@
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# This awk script expects to get command-line files that are each
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# the output of 'readelf -d' on a single shared object.
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# It exits successfully (0) if none contained any TEXTREL markers.
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# It fails (1) if any did contain a TEXTREL marker.
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# It fails (2) if the input did not take the expected form.
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BEGIN { result = textrel = sanity = 0 }
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function check_one(name) {
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if (!sanity) {
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print name ": *** input did not look like readelf -d output";
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result = 2;
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} else if (textrel) {
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print name ": *** text relocations used";
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result = result ? result : 1;
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} else {
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print name ": OK";
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}
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textrel = sanity = 0;
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}
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FILENAME != lastfile {
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if (lastfile)
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check_one(lastfile);
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lastfile = FILENAME;
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}
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$1 == "Tag" && $2 == "Type" { sanity = 1 }
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$2 == "(TEXTREL)" { textrel = 1 }
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$2 == "(FLAGS)" {
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for (i = 3; i <= NF; ++i) {
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if ($i == "TEXTREL")
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textrel = 1;
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}
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}
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END {
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check_one(lastfile);
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exit(result);
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}
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