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115 lines
4.0 KiB
115 lines
4.0 KiB
From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
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From: Jozef Lawrynowicz <jozef.l@mittosystems.com>
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Date: Mon, 6 Dec 2021 12:56:59 -0500
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Subject: gdb-rhbz2018504-do-not-update-elf-headers.patch
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;; Backport gdb/20948 (--write option to GDB causes segfault)
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;; (Jozef Lawrynowicz, RHBZ 2018504)
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Fix PR gdb/20948: --write option to GDB causes segmentation fault
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When opening a BFD for update, as gdb --write does, modifications to
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anything but the contents of sections is restricted.
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Do not try to write back any ELF headers in this case.
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diff --git a/bfd/elf.c b/bfd/elf.c
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--- a/bfd/elf.c
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+++ b/bfd/elf.c
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@@ -6418,6 +6418,18 @@ _bfd_elf_write_object_contents (bfd *abfd)
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if (! abfd->output_has_begun
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&& ! _bfd_elf_compute_section_file_positions (abfd, NULL))
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return FALSE;
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+ /* Do not rewrite ELF data when the BFD has been opened for update.
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+ abfd->output_has_begun was set to TRUE on opening, so creation of new
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+ sections, and modification of existing section sizes was restricted.
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+ This means the ELF header, program headers and section headers can't have
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+ changed.
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+ If the contents of any sections has been modified, then those changes have
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+ already been written to the BFD. */
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+ else if (abfd->direction == both_direction)
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+ {
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+ BFD_ASSERT (abfd->output_has_begun);
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+ return TRUE;
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+ }
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i_shdrp = elf_elfsections (abfd);
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diff --git a/gdb/testsuite/gdb.base/write_mem.c b/gdb/testsuite/gdb.base/write_mem.c
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new file mode 100644
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--- /dev/null
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+++ b/gdb/testsuite/gdb.base/write_mem.c
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@@ -0,0 +1,20 @@
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+/* Copyright (C) 2018 Free Software Foundation, Inc.
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+
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+ This program is free software; you can redistribute it and/or modify
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+ it under the terms of the GNU General Public License as published by
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+ the Free Software Foundation; either version 3 of the License, or
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+ (at your option) any later version.
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+
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+ This program 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
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+ GNU General Public License for more details.
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+
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+ You should have received a copy of the GNU General Public License
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+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
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+
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+int main (void)
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+{
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+ while (1);
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+ return 0;
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+}
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diff --git a/gdb/testsuite/gdb.base/write_mem.exp b/gdb/testsuite/gdb.base/write_mem.exp
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new file mode 100644
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--- /dev/null
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+++ b/gdb/testsuite/gdb.base/write_mem.exp
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@@ -0,0 +1,47 @@
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+# Copyright (C) 2018 Free Software Foundation, Inc.
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+
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+# This program is free software; you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation; either version 3 of the License, or
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+# (at your option) any later version.
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+#
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+# This program 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
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+# GNU General Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License
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+# along with this program. If not, see <http://www.gnu.org/licenses/>.
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+
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+# Contributed by Jozef Lawrynowicz (jozef.l@mittosystems.com)
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+
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+# Test for PR gdb/20948
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+# Verify that invoking gdb with the --write argument works as expected
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+
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+global GDBFLAGS
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+standard_testfile
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+
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+if {[build_executable $testfile.exp $testfile \
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+ $srcfile [list debug nowarnings] ] == -1} {
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+ untested $testfile.exp
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+ return -1
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+}
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+
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+set old_gdbflags $GDBFLAGS
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+
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+# Expect a failure before --write has been added to the command line
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+set GDBFLAGS "$old_gdbflags $binfile"
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+clean_restart
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+test_print_reject "set {int}main = 0x4242" "Cannot access memory at address"
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+
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+# Setting memory should now work correctly after adding --write
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+set GDBFLAGS "$old_gdbflags --write $binfile"
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+clean_restart
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+gdb_test_no_output "set {int}main = 0x4242"
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+
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+# Check that memory write persists after quitting GDB
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+gdb_exit
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+gdb_start
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+gdb_test "x /xh main" "<main>:.*4242"
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+
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+set GDBFLAGS $old_gdbflags
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