Similar to the ld.bfd, with the -z,memory-seal and -z,no-memory-seal
which adds the .gnu.attribute GNU_PROPERTY_MEMORY_SEAL.
---
elfcpp/elfcpp.h | 1 +
gold/NEWS | 3 ++
gold/layout.cc | 4 +++
gold/options.h | 3 ++
gold/testsuite/Makefile.am | 19 ++++++++++++
gold/testsuite/Makefile.in | 26 +++++++++++++++--
gold/testsuite/memory_seal_main.c | 5 ++++
gold/testsuite/memory_seal_shared.c | 7 +++++
gold/testsuite/memory_seal_test.sh | 45 +++++++++++++++++++++++++++++
9 files changed, 110 insertions(+), 3 deletions(-)
create mode 100644 gold/testsuite/memory_seal_main.c
create mode 100644 gold/testsuite/memory_seal_shared.c
create mode 100755 gold/testsuite/memory_seal_test.sh
@@ -1023,6 +1023,7 @@ enum
{
GNU_PROPERTY_STACK_SIZE = 1,
GNU_PROPERTY_NO_COPY_ON_PROTECTED = 2,
+ GNU_PROPERTY_MEMORY_SEAL = 3,
GNU_PROPERTY_LOPROC = 0xc0000000,
GNU_PROPERTY_X86_COMPAT_ISA_1_USED = 0xc0000000,
GNU_PROPERTY_X86_COMPAT_ISA_1_NEEDED = 0xc0000001,
@@ -5,6 +5,9 @@
* Remove support for -z bndplt (MPX prefix instructions).
+* Add -z memory-seal/-z nomemory-seal options to ELF linker to mark the
+ object to memory sealed.
+
Changes in 1.16:
* Improve warning messages for relocations that refer to discarded sections.
@@ -3277,6 +3277,10 @@ Layout::create_gnu_properties_note()
{
parameters->target().finalize_gnu_properties(this);
+ if (parameters->options().memory_seal())
+ this->add_gnu_property(elfcpp::NT_GNU_PROPERTY_TYPE_0,
+ elfcpp::GNU_PROPERTY_MEMORY_SEAL, 0, 0);
+
if (this->gnu_properties_.empty())
return;
@@ -1546,6 +1546,9 @@ class General_options
N_("Keep .text.hot, .text.startup, .text.exit and .text.unlikely "
"as separate sections in the final binary."),
N_("Merge all .text.* prefix sections."));
+ DEFINE_bool(memory_seal, options::DASH_Z, '\0', false,
+ N_("Mark object be memory sealed"),
+ N_("Don't mark oject to be memory sealed"));
public:
@@ -4476,3 +4476,22 @@ package_metadata_test.o: package_metadata_main.c
package_metadata_test$(EXEEXT): package_metadata_test.o gcctestdir/ld
$(CXXLINK) package_metadata_test.o -Wl,--package-metadata='{"foo":"bar"}'
$(TEST_READELF) --notes $@ | grep -q '{"foo":"bar"}'
+
+check_SCRIPTS += memory_seal_test.sh
+check_DATA += memory_seal_test_1.stdout memory_seal_test_2.stdout
+MOSTLYCLEANFILES += memory_seal_test
+memory_seal_test_1.stdout: memory_seal_main
+ $(TEST_READELF) -n $< >$@
+memory_seal_test_2.stdout: memory_seal_shared.so
+ $(TEST_READELF) -n $< >$@
+memory_seal_main: gcctestdir/ld memory_seal_main.o
+ gcctestdir/ld -z memory-seal -o $@ memory_seal_main.o
+memory_seal_main.o: memory_seal_main.c
+ $(COMPILE) -c -o $@ $<
+memory_seal_shared.so: gcctestdir/ld memory_seal_shared.o
+ gcctestdir/ld -z memory-seal -shared -o $@ memory_seal_shared.o
+memory_seal_shared.o: memory_seal_shared.c
+ $(COMPILE) -c -fPIC -o $@ $<
+
+
+
@@ -2888,7 +2888,7 @@ MOSTLYCLEANFILES = *.so *.syms *.stdout *.stderr $(am__append_4) \
$(am__append_88) $(am__append_91) $(am__append_93) \
$(am__append_102) $(am__append_105) $(am__append_108) \
$(am__append_111) $(am__append_114) $(am__append_117) \
- $(am__append_120) $(am__append_121)
+ $(am__append_120) $(am__append_121) memory_seal_test
# We will add to these later, for each individual test. Note
# that we add each test under check_SCRIPTS or check_PROGRAMS;
@@ -2901,7 +2901,7 @@ check_SCRIPTS = $(am__append_2) $(am__append_21) $(am__append_25) \
$(am__append_89) $(am__append_96) $(am__append_100) \
$(am__append_103) $(am__append_106) $(am__append_109) \
$(am__append_112) $(am__append_115) $(am__append_118) \
- $(am__append_122)
+ $(am__append_122) memory_seal_test.sh
check_DATA = $(am__append_3) $(am__append_22) $(am__append_26) \
$(am__append_32) $(am__append_38) $(am__append_45) \
$(am__append_50) $(am__append_54) $(am__append_58) \
@@ -2910,7 +2910,8 @@ check_DATA = $(am__append_3) $(am__append_22) $(am__append_26) \
$(am__append_90) $(am__append_97) $(am__append_101) \
$(am__append_104) $(am__append_107) $(am__append_110) \
$(am__append_113) $(am__append_116) $(am__append_119) \
- $(am__append_123)
+ $(am__append_123) memory_seal_test_1.stdout \
+ memory_seal_test_2.stdout
BUILT_SOURCES = $(am__append_42)
TESTS = $(check_SCRIPTS) $(check_PROGRAMS)
@@ -6524,6 +6525,13 @@ retain.sh.log: retain.sh
--log-file $$b.log --trs-file $$b.trs \
$(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
"$$tst" $(AM_TESTS_FD_REDIRECT)
+memory_seal_test.sh.log: memory_seal_test.sh
+ @p='memory_seal_test.sh'; \
+ b='memory_seal_test.sh'; \
+ $(am__check_pre) $(LOG_DRIVER) --test-name "$$f" \
+ --log-file $$b.log --trs-file $$b.trs \
+ $(am__common_driver_flags) $(AM_LOG_DRIVER_FLAGS) $(LOG_DRIVER_FLAGS) -- $(LOG_COMPILE) \
+ "$$tst" $(AM_TESTS_FD_REDIRECT)
object_unittest.log: object_unittest$(EXEEXT)
@p='object_unittest$(EXEEXT)'; \
b='object_unittest'; \
@@ -10524,6 +10532,18 @@ package_metadata_test.o: package_metadata_main.c
package_metadata_test$(EXEEXT): package_metadata_test.o gcctestdir/ld
$(CXXLINK) package_metadata_test.o -Wl,--package-metadata='{"foo":"bar"}'
$(TEST_READELF) --notes $@ | grep -q '{"foo":"bar"}'
+memory_seal_test_1.stdout: memory_seal_main
+ $(TEST_READELF) -n $< >$@
+memory_seal_test_2.stdout: memory_seal_shared.so
+ $(TEST_READELF) -n $< >$@
+memory_seal_main: gcctestdir/ld memory_seal_main.o
+ gcctestdir/ld -z memory-seal -o $@ memory_seal_main.o
+memory_seal_main.o: memory_seal_main.c
+ $(COMPILE) -c -o $@ $<
+memory_seal_shared.so: gcctestdir/ld memory_seal_shared.o
+ gcctestdir/ld -z memory-seal -shared -o $@ memory_seal_shared.o
+memory_seal_shared.o: memory_seal_shared.c
+ $(COMPILE) -c -fPIC -o $@ $<
# Tell versions [3.59,3.63) of GNU make to not export all variables.
# Otherwise a system limit (for SysV at least) may be exceeded.
new file mode 100644
@@ -0,0 +1,5 @@
+int
+main(void)
+{
+ return 0;
+}
new file mode 100644
@@ -0,0 +1,7 @@
+int foo (void);
+
+int
+foo(void)
+{
+ return 0;
+}
new file mode 100755
@@ -0,0 +1,45 @@
+#!/bin/sh
+
+# memory_seal_test.sh -- test GNU_PROPERTY_MEMORY_SEAL gnu property
+
+# Copyright (C) 2018-2024 Free Software Foundation, Inc.
+
+# 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 script checks that after linking the three object files
+# gnu_property_[abc].S, each of which contains a .note.gnu.property
+# section, the resulting output has only a single such note section,
+# and that the properties have been correctly combined.
+
+check()
+{
+ if ! grep -q "$2" "$1"
+ then
+ echo "Did not find expected output in $1:"
+ echo " $2"
+ echo ""
+ echo "Actual output below:"
+ cat "$1"
+ exit 1
+ fi
+}
+
+check memory_seal_test_1.stdout "memory seal"
+check memory_seal_test_2.stdout "memory seal"
+
+exit 0