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gdb/gdb-bz559414-pie-assert-fix.patch

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http://sourceware.org/ml/gdb-patches/2010-01/msg00661.html
Subject: [patch] Fix failed gdb_assert due to the PIE patchset
Hi,
the PIE patchset brought in an occasionally failing gdb_assert (according to
Fedora ABRT bugreports).
solib-svr4.c:600: internal-error: scan_dyntag: Assertion `target_section < current_target_sections->sections_end' failed.
Now I understand it as generally current_target_sections are about target-side
data while symbols are the GDB side and there is only loose relation of those.
ABFD can be from multiple places acting for multiple purposes as parsed by
elf_lookup_lib_symbol:
exec_bfd:
It cannot be from exec_one - this BFD has no associated objfile to
pass to symfile_objfile. OK.
symfile_objfile:
It gets translated by elf_lookup_lib_symbol into exec_bfd which
represents the target data. OK.
so_list's objfile's separate_debug_objfile file:
gdb_assert-forbidden as input to elf_lookup_lib_symbol. OK.
so_list's objfile's main file:
update_solib_list must have called add_target_sections. OK.
objfile's separate_debug_objfile file:
gdb_assert-forbidden as input to elf_lookup_lib_symbol. OK.
objfile's main file (if it has no associated so_list):
Such ABFD from add_symbol_file_command has no add_target_sections
called. Still it can have current context BLOCK which crashes
scan_dyntag. BUG.
No regressions on {x86_64,x86_64-m32,i686}-fedora12-linux-gnu.
The patch mostly reverts the PIE part there.
OK to check in?
Sorry,
Jan
gdb/
2010-01-31 Jan Kratochvil <jan.kratochvil@redhat.com>
* solib-svr4.c (scan_dyntag): New variable dyn_addr. Replace gdb_assert
by a conditional setting DYN_ADDR. Use DYN_ADDR.
* config/djgpp/fnchange.lst: Add translations for
symbol-without-target_section.exp and symbol-without-target_section.c.
gdb/testsuite/
2010-01-31 Jan Kratochvil <jan.kratochvil@redhat.com>
* gdb.base/symbol-without-target_section.exp,
gdb.base/symbol-without-target_section.c: New.
--- a/gdb/config/djgpp/fnchange.lst
+++ b/gdb/config/djgpp/fnchange.lst
@@ -394,6 +394,8 @@
@V@/gdb/testsuite/gdb.base/solib-symbol-main.c @V@/gdb/testsuite/gdb.base/so-symmain.c
@V@/gdb/testsuite/gdb.base/solib-overlap-lib.c @V@/gdb/testsuite/gdb.base/so-ovrlib.c
@V@/gdb/testsuite/gdb.base/solib-overlap-main.c @V@/gdb/testsuite/gdb.base/so-ovrmain.c
+@V@/gdb/testsuite/gdb.base/gdb.base/symbol-without-target_section.exp @V@/gdb/testsuite/gdb.base/symnosec.exp
+@V@/gdb/testsuite/gdb.base/gdb.base/symbol-without-target_section.c @V@/gdb/testsuite/gdb.base/symnosec.c
@V@/gdb/testsuite/gdb.base/type-opaque-lib.c @V@/gdb/testsuite/gdb.base/ty-opqlib.c
@V@/gdb/testsuite/gdb.base/type-opaque-main.c @V@/gdb/testsuite/gdb.base/ty-opqmain.c
@V@/gdb/testsuite/gdb.base/watchpoint-hw.c @V@/gdb/testsuite/gdb.base/wp-hw.c
--- a/gdb/solib-svr4.c
+++ b/gdb/solib-svr4.c
@@ -570,7 +570,7 @@ scan_dyntag (int dyntag, bfd *abfd, CORE_ADDR *ptr)
{
int arch_size, step, sect_size;
long dyn_tag;
- CORE_ADDR dyn_ptr;
+ CORE_ADDR dyn_ptr, dyn_addr;
gdb_byte *bufend, *bufstart, *buf;
Elf32_External_Dyn *x_dynp_32;
Elf64_External_Dyn *x_dynp_64;
@@ -597,7 +597,17 @@ scan_dyntag (int dyntag, bfd *abfd, CORE_ADDR *ptr)
target_section++)
if (sect == target_section->the_bfd_section)
break;
- gdb_assert (target_section < current_target_sections->sections_end);
+ if (target_section < current_target_sections->sections_end)
+ dyn_addr = target_section->addr;
+ else
+ {
+ /* ABFD may come from OBJFILE acting only as a symbol file without being
+ loaded into the target (see add_symbol_file_command). This case is
+ such fallback to the file VMA address without the possibility of
+ having the section relocated to its actual in-memory address. */
+
+ dyn_addr = bfd_section_vma (abfd, sect);
+ }
/* Read in .dynamic from the BFD. We will get the actual value
from memory later. */
@@ -639,7 +649,7 @@ scan_dyntag (int dyntag, bfd *abfd, CORE_ADDR *ptr)
CORE_ADDR ptr_addr;
ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
- ptr_addr = target_section->addr + (buf - bufstart) + arch_size / 8;
+ ptr_addr = dyn_addr + (buf - bufstart) + arch_size / 8;
if (target_read_memory (ptr_addr, ptr_buf, arch_size / 8) == 0)
dyn_ptr = extract_typed_address (ptr_buf, ptr_type);
*ptr = dyn_ptr;
--- /dev/null
+++ b/gdb/testsuite/gdb.base/symbol-without-target_section.c
@@ -0,0 +1,18 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2010 Free Software Foundation, Inc.
+
+ 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, see <http://www.gnu.org/licenses/>. */
+
+int symbol_without_target_section;
--- /dev/null
+++ b/gdb/testsuite/gdb.base/symbol-without-target_section.exp
@@ -0,0 +1,39 @@
+# Copyright 2010 Free Software Foundation, Inc.
+
+# 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, see <http://www.gnu.org/licenses/>.
+
+# Exploit formerly failed assertion in scan_dyntag when it got called for
+# objfile having ".dynamic" section but without having data loaded in target.
+# Such file is ${binmainfile} through add-symbol-file here. Set context first
+# by "list main" to have some local BLOCK set in lookup_symbol_global.
+
+set testfile symbol-without-target_section
+set srclibfile ${testfile}.c
+set binlibfile ${testfile}.x
+set srcmainfile start.c
+set binmainfile ${testfile}
+if { [gdb_compile "${srcdir}/${subdir}/${srclibfile}" \
+ "${objdir}/${subdir}/${binlibfile}" object {debug}] != "" } {
+ untested ${testfile}.exp
+ return -1
+}
+if {[build_executable ${testfile}.exp ${binmainfile} ${srcmainfile} {debug}] == -1} {
+ return -1
+}
+clean_restart ${binlibfile}
+
+gdb_test "add-symbol-file ${objdir}/${subdir}/${binmainfile} 0" "" "add-symbol-file" \
+ "add symbol table from file \".*\" at.*\\(y or n\\) " "y"
+gdb_test "list main"
+gdb_test "print symbol_without_target_section"
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