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* layout.cc (Layout::set_segment_offsets): Don't try to realign data

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segment that has been aligned for relro.
	* output.cc (Output_segment::set_section_addresses): Change signature;
	adjust all callers.  Account for alignment when totalling
	size of relro sections.
	* output.h (Output_segment::set_section_addresses): Change signature.
	* testsuite/Makefile.am (relro_test.sh, relro_test.stdout): New
	targets.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/relro_test.cc: Add alignment attributes to test proper
	alignment of relro sections when padding is necessary.
	* testsuite/relro_test.sh: New script.
This commit is contained in:
Cary Coutant 2010-10-16 00:37:25 +00:00
parent 591c895777
commit fc497986a3
7 changed files with 129 additions and 15 deletions
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13
gold/layout.cc
View File

@ -2656,17 +2656,21 @@ Layout::set_segment_offsets(const Target* target, Output_segment* load_seg,
}
unsigned int shndx_hold = *pshndx;
bool has_relro = false;
uint64_t new_addr = (*p)->set_section_addresses(this, false, addr,
increase_relro,
&increase_relro,
&has_relro,
&off, pshndx);
// Now that we know the size of this segment, we may be able
// to save a page in memory, at the cost of wasting some
// file space, by instead aligning to the start of a new
// page. Here we use the real machine page size rather than
// the ABI mandated page size.
// the ABI mandated page size. If the segment has been
// aligned so that the relro data ends at a page boundary,
// we do not try to realign it.
if (!are_addresses_set && aligned_addr != addr)
if (!are_addresses_set && !has_relro && aligned_addr != addr)
{
uint64_t first_off = (common_pagesize
- (aligned_addr
@ -2684,7 +2688,8 @@ Layout::set_segment_offsets(const Target* target, Output_segment* load_seg,
off = orig_off + ((addr - orig_addr) & (abi_pagesize - 1));
off = align_file_offset(off, addr, abi_pagesize);
new_addr = (*p)->set_section_addresses(this, true, addr,
increase_relro,
&increase_relro,
&has_relro,
&off, pshndx);
}
}

34
gold/output.cc
View File

@ -3656,18 +3656,26 @@ Output_segment::has_dynamic_reloc_list(const Output_data_list* pdl) const
// Set the section addresses for an Output_segment. If RESET is true,
// reset the addresses first. ADDR is the address and *POFF is the
// file offset. Set the section indexes starting with *PSHNDX.
// *PINCREASE_RELRO is the size of the portion of the first non-relro
// section that should be included in the PT_GNU_RELRO segment; if
// there is alignment padding between the last relro section and the
// next section, we add that padding to that size and return the
// updated value. If this segment has relro sections, and has been
// aligned for that purpose, set *HAS_RELRO to TRUE.
// Return the address of the immediately following segment. Update
// *POFF and *PSHNDX.
// *PINCREASE_RELRO, *HAS_RELRO, *POFF, and *PSHNDX.
uint64_t
Output_segment::set_section_addresses(const Layout* layout, bool reset,
uint64_t addr,
unsigned int increase_relro,
unsigned int* pincrease_relro,
bool* has_relro,
off_t* poff,
unsigned int* pshndx)
{
gold_assert(this->type_ == elfcpp::PT_LOAD);
uint64_t last_relro_pad = 0;
off_t orig_off = *poff;
// If we have relro sections, we need to pad forward now so that the
@ -3678,6 +3686,7 @@ Output_segment::set_section_addresses(const Layout* layout, bool reset,
{
uint64_t relro_size = 0;
off_t off = *poff;
uint64_t max_align = 0;
for (int i = 0; i < static_cast<int>(ORDER_MAX); ++i)
{
Output_data_list* pdl = &this->output_lists_[i];
@ -3689,6 +3698,10 @@ Output_segment::set_section_addresses(const Layout* layout, bool reset,
Output_section* pos = (*p)->output_section();
if (!pos->is_relro())
break;
uint64_t align = (*p)->addralign();
if (align > max_align)
max_align = align;
relro_size = align_address(relro_size, align);
if ((*p)->is_address_valid())
relro_size += (*p)->data_size();
else
@ -3703,12 +3716,20 @@ Output_segment::set_section_addresses(const Layout* layout, bool reset,
if (p != pdl->end())
break;
}
relro_size += increase_relro;
relro_size += *pincrease_relro;
// Pad the total relro size to a multiple of the maximum
// section alignment seen.
uint64_t aligned_size = align_address(relro_size, max_align);
// Note the amount of padding added after the last relro section.
last_relro_pad = aligned_size - relro_size;
// Adjust *PINCREASE_RELRO to include the padding.
*pincrease_relro += last_relro_pad;
*has_relro = true;
uint64_t page_align = parameters->target().common_pagesize();
// Align to offset N such that (N + RELRO_SIZE) % PAGE_ALIGN == 0.
uint64_t desired_align = page_align - (relro_size % page_align);
uint64_t desired_align = page_align - (aligned_size % page_align);
if (desired_align < *poff % page_align)
*poff += page_align - *poff % page_align;
*poff += desired_align - *poff % page_align;
@ -3739,6 +3760,11 @@ Output_segment::set_section_addresses(const Layout* layout, bool reset,
addr = this->set_section_list_addresses(layout, reset,
&this->output_lists_[i],
addr, poff, pshndx, &in_tls);
if (i == static_cast<int>(ORDER_RELRO_LAST))
{
*poff += last_relro_pad;
addr += last_relro_pad;
}
if (i < static_cast<int>(ORDER_SMALL_BSS))
{
this->filesz_ = *poff - orig_off;

4
gold/output.h
View File

@ -3908,8 +3908,8 @@ class Output_segment
// *PSHNDX. This should only be called for a PT_LOAD segment.
uint64_t
set_section_addresses(const Layout*, bool reset, uint64_t addr,
unsigned int increase_relro, off_t* poff,
unsigned int* pshndx);
unsigned int* pincrease_relro, bool* has_relro,
off_t* poff, unsigned int* pshndx);
// Set the minimum alignment of this segment. This may be adjusted
// upward based on the section alignments.

4
gold/testsuite/Makefile.am
View File

@ -1076,6 +1076,8 @@ protected_3.err: protected_4_pic.o gcctestdir/ld
fi
check_PROGRAMS += relro_test
check_SCRIPTS += relro_test.sh
check_DATA += relro_test.stdout
relro_test_SOURCES = relro_test_main.cc
relro_test_DEPENDENCIES = gcctestdir/ld relro_test.so
relro_test_LDFLAGS = -Bgcctestdir/ -Wl,-R,.
@ -1084,6 +1086,8 @@ relro_test.so: gcctestdir/ld relro_test_pic.o
$(CXXLINK) -Bgcctestdir/ -shared -Wl,-z,relro relro_test_pic.o
relro_test_pic.o: relro_test.cc
$(CXXCOMPILE) -c -fpic -o $@ $<
relro_test.stdout: relro_test.so
$(TEST_READELF) -SlW relro_test.so > relro_test.stdout
check_PROGRAMS += relro_strip_test
relro_strip_test_SOURCES = relro_test_main.cc

12
gold/testsuite/Makefile.in
View File

@ -75,6 +75,7 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_1.sh ver_test_2.sh \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_4.sh ver_test_5.sh \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_7.sh ver_test_10.sh \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ relro_test.sh \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_matching_test.sh \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ script_test_3.sh \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ script_test_4.sh \
@ -112,6 +113,7 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_2.syms ver_test_4.syms \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_5.syms ver_test_7.syms \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_10.syms protected_3.err \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ relro_test.stdout \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_matching_test.stdout \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ script_test_3.stdout \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ script_test_4.stdout \
@ -3301,6 +3303,8 @@ ver_test_7.sh.log: ver_test_7.sh
@p='ver_test_7.sh'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
ver_test_10.sh.log: ver_test_10.sh
@p='ver_test_10.sh'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
relro_test.sh.log: relro_test.sh
@p='relro_test.sh'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
ver_matching_test.sh.log: ver_matching_test.sh
@p='ver_matching_test.sh'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
script_test_3.sh.log: script_test_3.sh
@ -4196,6 +4200,8 @@ uninstall-am:
@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(CXXLINK) -Bgcctestdir/ -shared -Wl,-z,relro relro_test_pic.o
@GCC_TRUE@@NATIVE_LINKER_TRUE@relro_test_pic.o: relro_test.cc
@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(CXXCOMPILE) -c -fpic -o $@ $<
@GCC_TRUE@@NATIVE_LINKER_TRUE@relro_test.stdout: relro_test.so
@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(TEST_READELF) -SlW relro_test.so > relro_test.stdout
@GCC_TRUE@@NATIVE_LINKER_TRUE@relro_strip_test.so: relro_test.so
@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(TEST_STRIP) -o $@ $<
@GCC_TRUE@@NATIVE_LINKER_TRUE@relro_script_test.so: gcctestdir/ld relro_script_test.t relro_test_pic.o
@ -4560,10 +4566,10 @@ uninstall-am:
@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(TEST_READELF) -lWS $< > $@
@NATIVE_OR_CROSS_LINKER_TRUE@script_test_10.o: script_test_10.s
@NATIVE_OR_CROSS_LINKER_TRUE@ $(TEST_AS) -o $@ $<
@NATIVE_OR_CROSS_LINKER_TRUE@script_test_10: $(srcdir)/script_test_10.t script_test_10.o
@NATIVE_OR_CROSS_LINKER_TRUE@ ../ld-new -o $@ script_test_10.o -T $(srcdir)/script_test_10.t
@NATIVE_OR_CROSS_LINKER_TRUE@script_test_10: $(srcdir)/script_test_10.t script_test_10.o gcctestdir/ld
@NATIVE_OR_CROSS_LINKER_TRUE@ gcctestdir/ld -o $@ script_test_10.o -T $(srcdir)/script_test_10.t
@NATIVE_OR_CROSS_LINKER_TRUE@script_test_10.stdout: script_test_10
@NATIVE_OR_CROSS_LINKER_TRUE@ $(TEST_READELF) -SW script_test_10 > script_test_10.stdout
@NATIVE_OR_CROSS_LINKER_TRUE@ $(TEST_READELF) -SW script_test_10 > $@
@DEFAULT_TARGET_I386_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@split_i386_1.o: split_i386_1.s
@DEFAULT_TARGET_I386_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@ $(TEST_AS) -o $@ $<
@DEFAULT_TARGET_I386_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@split_i386_2.o: split_i386_2.s

4
gold/testsuite/relro_test.cc
View File

@ -40,10 +40,10 @@ int i1 = 1;
static int i2 = 2;
// P1 is a global relro variable.
int* const p1 = &i1;
int* const p1 __attribute__ ((aligned(64))) = &i1;
// P2 is a local relro variable.
int* const p2 = &i2;
int* const p2 __attribute__ ((aligned(64))) = &i2;
// Test symbol addresses.

73
gold/testsuite/relro_test.sh Executable file
View File

@ -0,0 +1,73 @@
#!/bin/sh
# relro_test.sh -- test -z relro
# Copyright 2010 Free Software Foundation, Inc.
# Written by Cary Coutant <ccoutant@google.com>.
# This file is part of gold.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
# This program 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 General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
# MA 02110-1301, USA.
# This test checks that the PT_GNU_RELRO segment is properly
# aligned and is coincident with the beginning of the data segment.
# Cleans a hexadecimal number for input to dc.
clean_hex()
{
echo "$1" | sed -e 's/0x//' -e 'y/abcdef/ABCDEF/'
}
check()
{
# Get the address and length of the PT_GNU_RELRO segment.
RELRO_START=`grep GNU_RELRO "$1" | awk '{ print $3; }'`
RELRO_LEN=`grep GNU_RELRO "$1" | awk '{ print $6; }'`
if test -z "$RELRO_START"
then
echo "Did not find a PT_GNU_RELRO segment."
exit 1
fi
# Get the address and alignment of the PT_LOAD segment whose address
# matches the PT_GNU_RELRO segment.
LOAD_ALIGN=`grep LOAD "$1" | awk -v A=$RELRO_START '$3 == A { print $NF; }'`
LOAD_LEN=`grep LOAD "$1" | awk -v A=$RELRO_START '$3 == A { print $6; }'`
if test -z "$LOAD_LEN"
then
echo "Did not find a PT_LOAD segment matching the PT_GNU_RELRO segment."
exit 1
fi
# Compute the address of the end of the PT_GNU_RELRO segment,
# modulo the alignment of the PT_LOAD segment.
RELRO_START=`clean_hex "$RELRO_START"`
RELRO_LEN=`clean_hex "$RELRO_LEN"`
LOAD_ALIGN=`clean_hex "$LOAD_ALIGN"`
RELRO_END=`echo "16o 16i $RELRO_START $RELRO_LEN + p" | dc`
REM=`echo "16i $RELRO_END $LOAD_ALIGN % p" | dc`
if test "$REM" -ne 0
then
echo "PT_GNU_RELRO segment does not end at page boundary."
exit 1
fi
}
check relro_test.stdout