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-rw-r--r--ChangeLog12
-rw-r--r--config.make.in1
-rw-r--r--elf/Makefile27
-rw-r--r--elf/check-textrel.c198
-rw-r--r--scripts/check-textrel.awk41
5 files changed, 70 insertions, 209 deletions
diff --git a/ChangeLog b/ChangeLog
index fcd2bca..e486924 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,15 @@
+2012-05-01 Roland McGrath <roland@hack.frob.com>
+
+ * scripts/check-textrel.awk: New file.
+ * elf/Makefile ($(objpfx)check-textrel): Target removed.
+ (check-textrel-CFLAGS): Variable removed.
+ (all-built-dso): Use := to define.o
+ ($(all-built-dso:=.dyn)): New static pattern rule.
+ (generated): Add those targets.
+ ($(objpfx)check-textrel.out): Use the script on the .dyn files.
+ * config.make.in (READELF): New substituted variable.
+ * elf/check-textrel.c: File removed.
+
2012-05-01 Joseph Myers <joseph@codesourcery.com>
* conform/data/assert.h-data [ISO || ISO99 || ISO11] (*_t): Do not
diff --git a/config.make.in b/config.make.in
index 1f4185b..5f6f9e2 100644
--- a/config.make.in
+++ b/config.make.in
@@ -112,6 +112,7 @@ BISON = @BISON@
AUTOCONF = @AUTOCONF@
OBJDUMP = @OBJDUMP@
OBJCOPY = @OBJCOPY@
+READELF = @READELF@
# Installation tools.
INSTALL = @INSTALL@
diff --git a/elf/Makefile b/elf/Makefile
index 32d113e..50934be 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -872,10 +872,6 @@ CFLAGS-tst-pie1.c += $(pie-ccflag)
$(objpfx)tst-pie1: $(objpfx)tst-piemod1.so
-check-textrel-CFLAGS = -O -Wall -D_XOPEN_SOURCE=600 -D_BSD_SOURCE
-$(objpfx)check-textrel: check-textrel.c
- $(native-compile)
-
check-execstack-CFLAGS = -O -Wall -D_XOPEN_SOURCE=600 -D_BSD_SOURCE -std=gnu99 \
$(objpfx:%/=-I%)
$(objpfx)check-execstack: check-execstack.c $(objpfx)check-execstack.h
@@ -895,14 +891,23 @@ $(objpfx)check-localplt: check-localplt.c
ifeq (yes,$(build-shared))
tests: $(objpfx)check-textrel.out $(objpfx)check-execstack.out
-all-built-dso = $(common-objpfx)libc.so \
- $(filter-out $(common-objpfx)linkobj/libc.so, \
- $(sort $(wildcard $(common-objpfx)*/lib*.so \
- $(common-objpfx)iconvdata/*.so)))
+all-built-dso := $(common-objpfx)libc.so \
+ $(filter-out $(common-objpfx)linkobj/libc.so, \
+ $(sort $(wildcard $(addprefix $(common-objpfx), \
+ */lib*.so \
+ iconvdata/*.so))))
-$(objpfx)check-textrel.out: $(objpfx)check-textrel $(all-built-dso)
- $(dir $<)$(notdir $<) $(filter-out $<, $^) > $@
-generated += check-textrel check-textrel.out
+$(all-built-dso:=.dyn): %.dyn: %
+ @rm -f $@T
+ LC_ALL=C $(READELF) -W -d $< > $@T
+ test -s $@T
+ mv -f $@T $@
+generated += $(all-built-dso:=.dyn)
+
+$(objpfx)check-textrel.out: $(..)scripts/check-textrel.awk \
+ $(all-built-dso:=.dyn)
+ LC_ALL=C $(AWK) -f $^ > $@
+generated += check-textrel.out
$(objpfx)check-execstack.out: $(objpfx)check-execstack $(all-built-dso)
$(dir $<)$(notdir $<) $(filter-out $<, $^) > $@
diff --git a/elf/check-textrel.c b/elf/check-textrel.c
deleted file mode 100644
index 6372019..0000000
--- a/elf/check-textrel.c
+++ /dev/null
@@ -1,198 +0,0 @@
-/* Check for text relocations in DSOs.
- Copyright (C) 2002, 2003, 2006 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contribute by Ulrich Drepper <drepper@redhat.com>. 2002.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
-
-#include <byteswap.h>
-#include <elf.h>
-#include <endian.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-
-#ifdef BITS
-
-# define AB(name) _AB (name, BITS)
-# define _AB(name, bits) __AB (name, bits)
-# define __AB(name, bits) name##bits
-# define E(name) _E (name, BITS)
-# define _E(name, bits) __E (name, bits)
-# define __E(name, bits) Elf##bits##_##name
-# define SWAP(val) \
- ({ __typeof (val) __res; \
- if (((ehdr.e_ident[EI_DATA] == ELFDATA2MSB \
- && BYTE_ORDER == LITTLE_ENDIAN) \
- || (ehdr.e_ident[EI_DATA] == ELFDATA2LSB \
- && BYTE_ORDER == BIG_ENDIAN)) \
- && sizeof (val) != 1) \
- { \
- if (sizeof (val) == 2) \
- __res = bswap_16 (val); \
- else if (sizeof (val) == 4) \
- __res = bswap_32 (val); \
- else \
- __res = bswap_64 (val); \
- } \
- else \
- __res = (val); \
- __res; })
-
-
-static int
-AB(handle_file) (const char *fname, int fd)
-{
- E(Ehdr) ehdr;
-
- if (pread (fd, &ehdr, sizeof (ehdr), 0) != sizeof (ehdr))
- {
- read_error:
- printf ("%s: read error: %m\n", fname);
- return 1;
- }
-
- const size_t phnum = SWAP (ehdr.e_phnum);
- const size_t phentsize = SWAP (ehdr.e_phentsize);
-
- /* Read the program header. */
- E(Phdr) *phdr = alloca (phentsize * phnum);
- if (pread (fd, phdr, phentsize * phnum, SWAP (ehdr.e_phoff))
- != phentsize * phnum)
- goto read_error;
-
- /* Search for the PT_DYNAMIC entry. */
- size_t cnt;
- E(Phdr) *dynphdr = NULL;
- for (cnt = 0; cnt < phnum; ++cnt)
- if (SWAP (phdr[cnt].p_type) == PT_DYNAMIC)
- dynphdr = &phdr[cnt];
- else if (SWAP (phdr[cnt].p_type) == PT_LOAD
- && (SWAP (phdr[cnt].p_flags) & (PF_X | PF_W)) == (PF_X | PF_W))
- {
- printf ("%s: segment %zu is executable and writable\n",
- fname, cnt);
-#if !defined __sparc__ \
- && !defined __alpha__ \
- && (!defined __powerpc__ || defined __powerpc64__ || defined HAVE_PPC_SECURE_PLT)
- /* sparc, sparc64, alpha and powerpc32 (the last one only when using
- -mbss-plt) are expected to have PF_X | PF_W segment containing .plt
- section, it is part of their ABI. It is bad security wise, nevertheless
- this test shouldn't fail because of this. */
- return 1;
-#endif
- }
-
- if (dynphdr == NULL)
- {
- printf ("%s: no DYNAMIC segment found\n", fname);
- return 1;
- }
-
- /* Read the dynamic segment. */
- size_t pmemsz = SWAP(dynphdr->p_memsz);
- E(Dyn) *dyn = alloca (pmemsz);
- if (pread (fd, dyn, pmemsz, SWAP(dynphdr->p_offset)) != pmemsz)
- goto read_error;
-
- /* Search for an DT_TEXTREL entry of DT_FLAGS with the DF_TEXTREL
- bit set. */
- for (cnt = 0; (cnt + 1) * sizeof (E(Dyn)) - 1 < pmemsz; ++cnt)
- {
- unsigned int tag = SWAP (dyn[cnt].d_tag);
-
- if (tag == DT_NULL)
- /* We reached the end. */
- break;
-
- if (tag == DT_TEXTREL
- || (tag == DT_FLAGS
- && (SWAP (dyn[cnt].d_un.d_val) & DF_TEXTREL) != 0))
- {
- /* Urgh! The DSO has text relocations. */
- printf ("%s: text relocations used\n", fname);
- return 1;
- }
- }
-
- printf ("%s: OK\n", fname);
-
- return 0;
-}
-
-# undef BITS
-#else
-
-# define BITS 32
-# include "check-textrel.c"
-
-# define BITS 64
-# include "check-textrel.c"
-
-
-static int
-handle_file (const char *fname)
-{
- int fd = open (fname, O_RDONLY);
- if (fd == -1)
- {
- printf ("cannot open %s: %m\n", fname);
- return 1;
- }
-
- /* Read was is supposed to be the ELF header. Read the initial
- bytes to determine whether this is a 32 or 64 bit file. */
- char ident[EI_NIDENT];
- if (read (fd, ident, EI_NIDENT) != EI_NIDENT)
- {
- printf ("%s: read error: %m\n", fname);
- close (fd);
- return 1;
- }
-
- if (memcmp (&ident[EI_MAG0], ELFMAG, SELFMAG) != 0)
- {
- printf ("%s: not an ELF file\n", fname);
- close (fd);
- return 1;
- }
-
- int result;
- if (ident[EI_CLASS] == ELFCLASS64)
- result = handle_file64 (fname, fd);
- else
- result = handle_file32 (fname, fd);
-
- close (fd);
-
- return result;
-}
-
-
-int
-main (int argc, char *argv[])
-{
- int cnt;
- int result = 0;
-
- for (cnt = 1; cnt < argc; ++cnt)
- result |= handle_file (argv[cnt]);
-
- return result;
-}
-#endif
diff --git a/scripts/check-textrel.awk b/scripts/check-textrel.awk
new file mode 100644
index 0000000..e7f2d70
--- /dev/null
+++ b/scripts/check-textrel.awk
@@ -0,0 +1,41 @@
+# This awk script expects to get command-line files that are each
+# the output of 'readelf -d' on a single shared object.
+# It exits successfully (0) if none contained any TEXTREL markers.
+# It fails (1) if any did contain a TEXTREL marker.
+# It fails (2) if the input did not take the expected form.
+
+BEGIN { result = textrel = sanity = 0 }
+
+function check_one(name) {
+ if (!sanity) {
+ print name ": *** input did not look like readelf -d output";
+ result = 2;
+ } else if (textrel) {
+ print name ": *** text relocations used";
+ result = result ? result : 1;
+ } else {
+ print name ": OK";
+ }
+
+ textrel = sanity = 0;
+}
+
+FILENAME != lastfile {
+ if (lastfile)
+ check_one(lastfile);
+ lastfile = FILENAME;
+}
+
+$1 == "Tag" && $2 == "Type" { sanity = 1 }
+$2 == "(TEXTREL)" { textrel = 1 }
+$2 == "(FLAGS)" {
+ for (i = 3; i <= NF; ++i) {
+ if ($i == "TEXTREL")
+ textrel = 1;
+ }
+}
+
+END {
+ check_one(lastfile);
+ exit(result);
+}
generated by cgit v1.1 at 2024-11-10 12:59:11 +0000