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Add a testcase for copy reloc against protected data

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Linkers in some versions of binutils 2.25 and 2.26 don't support protected
data symbol with error messsage like:

/usr/bin/ld: copy reloc against protected `bar' is invalid
/usr/bin/ld: failed to set dynamic section sizes: Bad value

We check if linker supports copy reloc against protected data symbol to
avoid running the test if linker is broken.

	[BZ #17711]
	* config.make.in (have-protected-data): New.
	* configure.ac: Check linker support for protected data symbol.
	* configure: Regenerated.
	* elf/Makefile (modules-names): Add tst-protected1moda and
	tst-protected1modb if $(have-protected-data) is yes.
	(tests): Add tst-protected1a and tst-protected1b if
	$(have-protected-data) is yes.
	($(objpfx)tst-protected1a): New.
	($(objpfx)tst-protected1b): Likewise.
	(tst-protected1modb.so-no-z-defs): Likewise.
	* elf/tst-protected1a.c: New file.
	* elf/tst-protected1b.c: Likewise.
	* elf/tst-protected1mod.h: Likewise.
	* elf/tst-protected1moda.c: Likewise.
	* elf/tst-protected1modb.c: Likewise.
This commit is contained in:
H.J. Lu 2015-03-31 05:20:55 -07:00
parent 62da1e3b00
commit 83569fb894
10 changed files with 763 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
ChangeLog
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@ -1,3 +1,22 @@
2015-03-31 H.J. Lu <hongjiu.lu@intel.com>
[BZ #17711]
* config.make.in (have-protected-data): New.
* configure.ac: Check linker support for protected data symbol.
* configure: Regenerated.
* elf/Makefile (modules-names): Add tst-protected1moda and
tst-protected1modb if $(have-protected-data) is yes.
(tests): Add tst-protected1a and tst-protected1b if
$(have-protected-data) is yes.
($(objpfx)tst-protected1a): New.
($(objpfx)tst-protected1b): Likewise.
(tst-protected1modb.so-no-z-defs): Likewise.
* elf/tst-protected1a.c: New file.
* elf/tst-protected1b.c: Likewise.
* elf/tst-protected1mod.h: Likewise.
* elf/tst-protected1moda.c: Likewise.
* elf/tst-protected1modb.c: Likewise.
2015-03-31 H.J. Lu <hongjiu.lu@intel.com>
[BZ #17711]

1
config.make.in
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@ -50,6 +50,7 @@ enable-werror = @enable_werror@
have-z-combreloc = @libc_cv_z_combreloc@
have-z-execstack = @libc_cv_z_execstack@
have-Bgroup = @libc_cv_Bgroup@
have-protected-data = @libc_cv_protected_data@
with-fp = @with_fp@
old-glibc-headers = @old_glibc_headers@
unwind-find-fde = @libc_cv_gcc_unwind_find_fde@

40
configure vendored
View File

@ -634,6 +634,7 @@ libc_cv_z_combreloc
ASFLAGS_config
libc_cv_Bgroup
libc_cv_cc_with_libunwind
libc_cv_protected_data
BISON
INSTALL_INFO
PERL
@ -5733,6 +5734,45 @@ $as_echo "$libc_cv_visibility_attribute" >&6; }
fi
fi
if test $libc_cv_visibility_attribute = yes; then
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking linker support for protected data symbol" >&5
$as_echo_n "checking linker support for protected data symbol... " >&6; }
if ${libc_cv_protected_data+:} false; then :
$as_echo_n "(cached) " >&6
else
cat > conftest.c <<EOF
int bar __attribute__ ((visibility ("protected"))) = 1;
EOF
libc_cv_protected_data=no
if { ac_try='${CC-cc} -nostdlib -nostartfiles -fPIC -shared conftest.c -o conftest.so'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; }; then
cat > conftest.c <<EOF
extern int bar;
int main (void) { return bar; }
EOF
if { ac_try='${CC-cc} -nostdlib -nostartfiles conftest.c -o conftest conftest.so'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; }; then
libc_cv_protected_data=yes
fi
fi
rm -f conftest.*
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_protected_data" >&5
$as_echo "$libc_cv_protected_data" >&6; }
else
libc_cv_protected_data=no
fi
if test $libc_cv_visibility_attribute = yes; then
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for broken __attribute__((visibility()))" >&5
$as_echo_n "checking for broken __attribute__((visibility()))... " >&6; }

23
configure.ac
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@ -1219,6 +1219,29 @@ EOF
fi
fi
if test $libc_cv_visibility_attribute = yes; then
AC_CACHE_CHECK(linker support for protected data symbol,
libc_cv_protected_data,
[cat > conftest.c <<EOF
int bar __attribute__ ((visibility ("protected"))) = 1;
EOF
libc_cv_protected_data=no
if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles -fPIC -shared conftest.c -o conftest.so); then
cat > conftest.c <<EOF
extern int bar;
int main (void) { return bar; }
EOF
if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles conftest.c -o conftest conftest.so); then
libc_cv_protected_data=yes
fi
fi
rm -f conftest.*
])
else
libc_cv_protected_data=no
fi
AC_SUBST(libc_cv_protected_data)
if test $libc_cv_visibility_attribute = yes; then
AC_CACHE_CHECK(for broken __attribute__((visibility())),
libc_cv_broken_visibility_attribute,

7
elf/Makefile
View File

@ -213,6 +213,13 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
tst-initorder2d \
tst-relsort1mod1 tst-relsort1mod2 tst-array2dep \
tst-array5dep tst-null-argv-lib
ifeq (yes,$(have-protected-data))
modules-names += tst-protected1moda tst-protected1modb
tests += tst-protected1a tst-protected1b
$(objpfx)tst-protected1a: $(addprefix $(objpfx),tst-protected1moda.so tst-protected1modb.so)
$(objpfx)tst-protected1b: $(addprefix $(objpfx),tst-protected1modb.so tst-protected1moda.so)
tst-protected1modb.so-no-z-defs = yes
endif
ifeq (yesyes,$(have-fpie)$(build-shared))
modules-names += tst-piemod1
tests += tst-pie1 tst-pie2

236
elf/tst-protected1a.c Normal file
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@ -0,0 +1,236 @@
/* Test the protected visibility when main is linked with moda and modb
in that order:
1. Protected symbols, protected1, protected2 and protected3, defined
in moda, are used in moda.
2. Protected symbol, protected3, defined in modb, are used in modb.
3. Symbol, protected1, defined in moda, is also used in main and modb.
4. Symbol, protected2, defined in main, is used in main.
5. Symbol, protected3, defined in moda, is also used in main.
Copyright (C) 2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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/>. */
/* This file must be compiled as PIE to avoid copy relocation when
accessing protected symbols defined in shared libaries since copy
relocation doesn't work with protected symbols and linker in
binutils 2.26 enforces this rule. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "tst-protected1mod.h"
/* Prototype for our test function. */
extern int do_test (void);
int protected2 = -1;
#define TEST_FUNCTION do_test ()
/* This defines the `main' function and some more. */
#include <test-skeleton.c>
int
do_test (void)
{
int res = 0;
/* Check if we get the same address for the protected data symbol. */
if (&protected1 != protected1a_p ())
{
puts ("`protected1' in main and moda doesn't have same address");
res = 1;
}
if (&protected1 != protected1b_p ())
{
puts ("`protected1' in main and modb doesn't have same address");
res = 1;
}
/* Check if we get the right value for the protected data symbol. */
if (protected1 != 3)
{
puts ("`protected1' in main and moda doesn't have same value");
res = 1;
}
/* Check if we get the right value for data defined in executable. */
if (protected2 != -1)
{
puts ("`protected2' in main has the wrong value");
res = 1;
}
/* Check `protected1' in moda. */
if (!check_protected1 ())
{
puts ("`protected1' in moda has the wrong value");
res = 1;
}
/* Check `protected2' in moda. */
if (!check_protected2 ())
{
puts ("`protected2' in moda has the wrong value");
res = 1;
}
/* Check if we get the same address for the protected data symbol. */
if (&protected3 != protected3a_p ())
{
puts ("`protected3' in main and moda doesn't have same address");
res = 1;
}
if (&protected3 == protected3b_p ())
{
puts ("`protected3' in main and modb has same address");
res = 1;
}
/* Check if we get the right value for the protected data symbol. */
if (protected3 != 5)
{
puts ("`protected3' in main and moda doesn't have same value");
res = 1;
}
/* Check `protected3' in moda. */
if (!check_protected3a ())
{
puts ("`protected3' in moda has the wrong value");
res = 1;
}
/* Check `protected3' in modb. */
if (!check_protected3b ())
{
puts ("`protected3' in modb has the wrong value");
res = 1;
}
/* Set `protected2' in moda to 30. */
set_protected2 (300);
/* Check `protected2' in moda. */
if (!check_protected2 ())
{
puts ("`protected2' in moda has the wrong value");
res = 1;
}
/* Set `protected1' in moda to 30. */
set_protected1a (30);
/* Check `protected1' in moda. */
if (!check_protected1 ())
{
puts ("`protected1' in moda has the wrong value");
res = 1;
}
/* Check if we get the updated value for the protected data symbol. */
if (protected1 != 30)
{
puts ("`protected1' in main doesn't have the updated value");
res = 1;
}
protected2 = -300;
/* Check `protected2' in moda. */
if (!check_protected2 ())
{
puts ("`protected2' in moda has the wrong value");
res = 1;
}
/* Check if data defined in executable is changed. */
if (protected2 != -300)
{
puts ("`protected2' in main is changed");
res = 1;
}
/* Set `protected1' in modb to 40. */
set_protected1b (40);
set_expected_protected1 (40);
/* Check `protected1' in moda. */
if (!check_protected1 ())
{
puts ("`protected1' in moda has the wrong value");
res = 1;
}
/* Check if we get the updated value for the protected data symbol. */
if (protected1 != 40)
{
puts ("`protected1' in main doesn't have the updated value");
res = 1;
}
/* Set `protected3' in moda to 80. */
set_protected3a (80);
/* Check `protected3' in moda. */
if (!check_protected3a ())
{
puts ("`protected3' in moda has the wrong value");
res = 1;
}
/* Check if we get the updated value for the protected data symbol. */
if (protected3 != 80)
{
puts ("`protected3' in main doesn't have the updated value");
res = 1;
}
/* Check `protected3' in modb. */
if (!check_protected3b ())
{
puts ("`protected3' in modb has the wrong value");
res = 1;
}
/* Set `protected3' in modb to 100. */
set_protected3b (100);
/* Check `protected3' in moda. */
if (!check_protected3a ())
{
puts ("`protected3' in moda has the wrong value");
res = 1;
}
/* Check if we get the updated value for the protected data symbol. */
if (protected3 != 80)
{
puts ("`protected3' in main doesn't have the updated value");
res = 1;
}
/* Check `protected3' in modb. */
if (!check_protected3b ())
{
puts ("`protected3' in modb has the wrong value");
res = 1;
}
return res;
}

242
elf/tst-protected1b.c Normal file
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@ -0,0 +1,242 @@
/* Test the protected visibility when main is linked with modb and moda
in that order:
1. Protected symbols, protected1, protected2 and protected3, defined
in moda, are used in moda.
2. Protected symbol, protected3, defined in modb, are used in modb
3. Symbol, protected1, defined in modb, is used in main and modb.
4. Symbol, protected2, defined in main, is used in main.
5. Symbol, protected3, defined in modb, is also used in main.
Copyright (C) 2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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/>. */
/* This file must be compiled as PIE to avoid copy relocation when
accessing protected symbols defined in shared libaries since copy
relocation doesn't work with protected symbols and linker in
binutils 2.26 enforces this rule. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "tst-protected1mod.h"
/* Prototype for our test function. */
extern int do_test (void);
int protected2 = -1;
#define TEST_FUNCTION do_test ()
/* This defines the `main' function and some more. */
#include <test-skeleton.c>
int
do_test (void)
{
int res = 0;
/* Check if we get the same address for the protected data symbol. */
if (&protected1 == protected1a_p ())
{
puts ("`protected1' in main and moda has same address");
res = 1;
}
if (&protected1 != protected1b_p ())
{
puts ("`protected1' in main and modb doesn't have same address");
res = 1;
}
/* Check if we get the right value for the protected data symbol. */
if (protected1 != -3)
{
puts ("`protected1' in main and modb doesn't have same value");
res = 1;
}
/* Check if we get the right value for data defined in executable. */
if (protected2 != -1)
{
puts ("`protected2' in main has the wrong value");
res = 1;
}
/* Check `protected1' in moda. */
if (!check_protected1 ())
{
puts ("`protected1' in moda has the wrong value");
res = 1;
}
/* Check `protected2' in moda. */
if (!check_protected2 ())
{
puts ("`protected2' in moda has the wrong value");
res = 1;
}
/* Check if we get the same address for the protected data symbol. */
if (&protected3 == protected3a_p ())
{
puts ("`protected3' in main and moda has same address");
res = 1;
}
if (&protected3 != protected3b_p ())
{
puts ("`protected3' in main and modb doesn't have same address");
res = 1;
}
/* Check if we get the right value for the protected data symbol. */
if (protected3 != -5)
{
puts ("`protected3' in main and modb doesn't have same value");
res = 1;
}
/* Check `protected3' in moda. */
if (!check_protected3a ())
{
puts ("`protected3' in moda has the wrong value");
res = 1;
}
/* Check `protected3' in modb. */
if (!check_protected3b ())
{
puts ("`protected3' in modb has the wrong value");
res = 1;
}
/* Set `protected2' in moda to 30. */
set_protected2 (300);
/* Check `protected2' in moda. */
if (!check_protected2 ())
{
puts ("`protected2' in moda has the wrong value");
res = 1;
}
/* Check if we get the right value for data defined in executable. */
if (protected2 != -1)
{
puts ("`protected2' in main has the wrong value");
res = 1;
}
/* Set `protected1' in moda to 30. */
set_protected1a (30);
/* Check `protected1' in moda. */
if (!check_protected1 ())
{
puts ("`protected1' in moda has the wrong value");
res = 1;
}
/* Check if we get the same value for the protected data symbol. */
if (protected1 != -3)
{
puts ("`protected1' in main has the wrong value");
res = 1;
}
protected2 = -300;
/* Check `protected2' in moda. */
if (!check_protected2 ())
{
puts ("`protected2' in moda has the wrong value");
res = 1;
}
/* Check if data defined in executable is changed. */
if (protected2 != -300)
{
puts ("`protected2' in main is changed");
res = 1;
}
/* Set `protected1' in modb to 40. */
set_protected1b (40);
/* Check `protected1' in moda. */
if (!check_protected1 ())
{
puts ("`protected1' in moda has the wrong value");
res = 1;
}
/* Check if we get the updated value for the protected data symbol. */
if (protected1 != 40)
{
puts ("`protected1' in main doesn't have the updated value");
res = 1;
}
/* Set `protected3' in moda to 80. */
set_protected3a (80);
/* Check `protected3' in moda. */
if (!check_protected3a ())
{
puts ("`protected3' in moda has the wrong value");
res = 1;
}
/* Check if we get the updated value for the protected data symbol. */
if (protected3 != -5)
{
puts ("`protected3' in main doesn't have the updated value");
res = 1;
}
/* Check `protected3' in modb. */
if (!check_protected3b ())
{
puts ("`protected3' in modb has the wrong value");
res = 1;
}
/* Set `protected3' in modb to 100. */
set_protected3b (100);
/* Check `protected3' in moda. */
if (!check_protected3a ())
{
puts ("`protected3' in moda has the wrong value");
res = 1;
}
/* Check if we get the updated value for the protected data symbol. */
if (protected3 != 100)
{
puts ("`protected3' in main doesn't have the updated value");
res = 1;
}
/* Check `protected3' in modb. */
if (!check_protected3b ())
{
puts ("`protected3' in modb has the wrong value");
res = 1;
}
return res;
}

41
elf/tst-protected1mod.h Normal file
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@ -0,0 +1,41 @@
/* Copyright (C) 2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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/>. */
/* Prototypes for the functions in the DSOs. */
extern int protected1;
extern int protected2;
extern int protected3;
extern void set_protected1a (int);
extern void set_protected1b (int);
extern int *protected1a_p (void);
extern int *protected1b_p (void);
extern void set_expected_protected1 (int);
extern int check_protected1 (void);
extern void set_protected2 (int);
extern int check_protected2 (void);
extern void set_expected_protected3a (int);
extern void set_protected3a (int);
extern int check_protected3a (void);
extern int *protected3a_p (void);
extern void set_expected_protected3b (int);
extern void set_protected3b (int);
extern int check_protected3b (void);
extern int *protected3b_p (void);

92
elf/tst-protected1moda.c Normal file
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@ -0,0 +1,92 @@
/* Copyright (C) 2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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 "tst-protected1mod.h"
int protected1 = 3;
static int expected_protected1 = 3;
int protected2 = 4;
static int expected_protected2 = 4;
int protected3 = 5;
static int expected_protected3 = 5;
asm (".protected protected1");
asm (".protected protected2");
asm (".protected protected3");
void
set_protected1a (int i)
{
protected1 = i;
set_expected_protected1 (i);
}
void
set_expected_protected1 (int i)
{
expected_protected1 = i;
}
int *
protected1a_p (void)
{
return &protected1;
}
int
check_protected1 (void)
{
return protected1 == expected_protected1;
}
void
set_protected2 (int i)
{
protected2 = i;
expected_protected2 = i;
}
int
check_protected2 (void)
{
return protected2 == expected_protected2;
}
void
set_expected_protected3a (int i)
{
expected_protected3 = i;
}
void
set_protected3a (int i)
{
protected3 = i;
set_expected_protected3a (i);
}
int
check_protected3a (void)
{
return protected3 == expected_protected3;
}
int *
protected3a_p (void)
{
return &protected3;
}

62
elf/tst-protected1modb.c Normal file
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@ -0,0 +1,62 @@
/* Copyright (C) 2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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 <stdlib.h>
#include "tst-protected1mod.h"
int protected1 = -3;
int protected3 = -5;
static int expected_protected3 = -5;
asm (".protected protected3");
void
set_protected1b (int i)
{
protected1 = i;
}
int *
protected1b_p (void)
{
return &protected1;
}
void
set_expected_protected3b (int i)
{
expected_protected3 = i;
}
void
set_protected3b (int i)
{
protected3 = i;
set_expected_protected3b (i);
}
int
check_protected3b (void)
{
return protected3 == expected_protected3;
}
int *
protected3b_p (void)
{
return &protected3;
}