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220 lines
11 KiB
220 lines
11 KiB
commit 80c570537e380c1b8e48754c0ddbce2abcde2d00 |
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Author: Jan Kratochvil <jan.kratochvil@redhat.com> |
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Date: Thu Feb 26 14:08:01 2015 +0100 |
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SEGV in ppc64_elf_get_synthetic_symtab reading a separate debug file |
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The attached patch fixes the SEGV and lets GDB successfully |
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load all kernel modules installed by default on RHEL 7. |
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Valgrind on F-21 x86_64 host has shown me more clear what is the problem: |
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Reading symbols from /home/jkratoch/t/cordic.ko...Reading symbols from |
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/home/jkratoch/t/cordic.ko.debug...================================================================= |
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==22763==ERROR: AddressSanitizer: heap-use-after-free on address 0x6120000461c8 at pc 0x150cdbd bp 0x7fffffffc7e0 sp 0x7fffffffc7d0 |
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READ of size 8 at 0x6120000461c8 thread T0 |
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#0 0x150cdbc in ppc64_elf_get_synthetic_symtab /home/jkratoch/redhat/gdb-test-asan/bfd/elf64-ppc.c:3282 |
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#1 0x8c5274 in elf_read_minimal_symbols /home/jkratoch/redhat/gdb-test-asan/gdb/elfread.c:1205 |
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#2 0x8c55e7 in elf_symfile_read /home/jkratoch/redhat/gdb-test-asan/gdb/elfread.c:1268 |
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[...] |
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0x6120000461c8 is located 264 bytes inside of 288-byte region [0x6120000460c0,0x6120000461e0) |
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freed by thread T0 here: |
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#0 0x7ffff715454f in __interceptor_free (/lib64/libasan.so.1+0x5754f) |
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#1 0xde9cde in xfree common/common-utils.c:98 |
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#2 0x9a04f7 in do_my_cleanups common/cleanups.c:155 |
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#3 0x9a05d3 in do_cleanups common/cleanups.c:177 |
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#4 0x8c538a in elf_read_minimal_symbols /home/jkratoch/redhat/gdb-test-asan/gdb/elfread.c:1229 |
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#5 0x8c55e7 in elf_symfile_read /home/jkratoch/redhat/gdb-test-asan/gdb/elfread.c:1268 |
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[...] |
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previously allocated by thread T0 here: |
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#0 0x7ffff71547c7 in malloc (/lib64/libasan.so.1+0x577c7) |
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#1 0xde9b95 in xmalloc common/common-utils.c:41 |
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#2 0x8c4da2 in elf_read_minimal_symbols /home/jkratoch/redhat/gdb-test-asan/gdb/elfread.c:1147 |
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#3 0x8c55e7 in elf_symfile_read /home/jkratoch/redhat/gdb-test-asan/gdb/elfread.c:1268 |
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[...] |
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SUMMARY: AddressSanitizer: heap-use-after-free /home/jkratoch/redhat/gdb-test-asan/bfd/elf64-ppc.c:3282 ppc64_elf_get_synthetic_symtab |
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[...] |
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==22763==ABORTING |
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A similar case a few lines later I have fixed in 2010 by: |
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https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=3f1eff0a2c7f0e7078f011f55b8e7f710aae0cc2 |
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My testcase does not always reproduce it but at least a bit: |
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* GDB without ppc64 target (even as a secondary one) is reported as "untested" |
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* ASAN-built GDB with ppc64 target always crashes (and PASSes with this fix) |
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* unpatched non-ASAN-built GDB with ppc64 target crashes from commandline |
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* unpatched non-ASAN-built GDB with ppc64 target PASSes from runtest (?) |
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gdb/ChangeLog |
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2015-02-26 Jan Kratochvil <jan.kratochvil@redhat.com> |
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* elfread.c (elf_read_minimal_symbols): Use bfd_alloc for |
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bfd_canonicalize_symtab. |
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gdb/testsuite/ChangeLog |
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2015-02-26 Jan Kratochvil <jan.kratochvil@redhat.com> |
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* gdb.arch/cordic.ko.bz2: New file. |
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* gdb.arch/cordic.ko.debug.bz2: New file. |
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* gdb.arch/ppc64-symtab-cordic.exp: New file. |
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Index: gdb-7.6.1/gdb/elfread.c |
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=================================================================== |
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--- gdb-7.6.1.orig/gdb/elfread.c |
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+++ gdb-7.6.1/gdb/elfread.c |
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@@ -2308,8 +2308,10 @@ elf_symfile_read (struct objfile *objfil |
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if (storage_needed > 0) |
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{ |
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- symbol_table = (asymbol **) xmalloc (storage_needed); |
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- make_cleanup (xfree, symbol_table); |
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+ /* Memory gets permanently referenced from ABFD after |
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+ bfd_canonicalize_symtab so it must not get freed before ABFD gets. */ |
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+ |
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+ symbol_table = bfd_alloc (abfd, storage_needed); |
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symcount = bfd_canonicalize_symtab (objfile->obfd, symbol_table); |
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if (symcount < 0) |
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Index: gdb-7.6.1/gdb/testsuite/gdb.arch/ppc64-symtab-cordic.exp |
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=================================================================== |
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--- /dev/null |
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+++ gdb-7.6.1/gdb/testsuite/gdb.arch/ppc64-symtab-cordic.exp |
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@@ -0,0 +1,51 @@ |
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+# Copyright 2015 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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+standard_testfile |
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+ |
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+set kobz2uufile ${srcdir}/${subdir}/cordic.ko.bz2.uu |
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+set kofile ${objdir}/${subdir}/cordic.ko |
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+set kodebugbz2uufile ${srcdir}/${subdir}/cordic.ko.debug.bz2.uu |
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+set kodebugfile ${objdir}/${subdir}/cordic.ko.debug |
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+ |
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+if {[catch "system \"uudecode -o - ${kobz2uufile} | bzip2 -dc >${kofile}\""] != 0} { |
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+ untested "failed bzip2 for ${kobz2uufile}" |
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+ return -1 |
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+} |
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+if {[catch "system \"uudecode -o - ${kodebugbz2uufile} | bzip2 -dc >${kodebugfile}\""] != 0} { |
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+ untested "failed bzip2 for ${kodebugbz2uufile}" |
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+ return -1 |
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+} |
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+ |
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+gdb_exit |
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+gdb_start |
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+gdb_reinitialize_dir $srcdir/$subdir |
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+ |
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+# This test won't work properly if system debuginfo is installed. |
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+# Test message is suppressed by "" as otherwise we could print PASS+UNTESTED |
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+# result to gdb.sum making a false feeling the issue has been tested. |
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+gdb_test_no_output "set debug-file-directory" "" |
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+ |
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+gdb_load ${kofile} |
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+ |
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+set test "show architecture" |
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+gdb_test_multiple $test $test { |
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+ -re "\r\nThe target architecture is set automatically \\(currently powerpc:common64\\)\r\n$gdb_prompt $" { |
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+ pass $test |
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+ } |
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+ -re "\r\nThe target architecture is set automatically \\(currently .*\\)\r\n$gdb_prompt $" { |
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+ untested "powerpc:common64 is not supported" |
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+ } |
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+} |
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Index: gdb-7.6.1/gdb/testsuite/gdb.arch/cordic.ko.bz2.uu |
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=================================================================== |
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--- /dev/null |
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+++ gdb-7.6.1/gdb/testsuite/gdb.arch/cordic.ko.bz2.uu |
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@@ -0,0 +1,53 @@ |
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+begin 664 cordic.ko.bz2.uu |
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+` |
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+end |
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Index: gdb-7.6.1/gdb/testsuite/gdb.arch/cordic.ko.debug.bz2.uu |
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=================================================================== |
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--- /dev/null |
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+++ gdb-7.6.1/gdb/testsuite/gdb.arch/cordic.ko.debug.bz2.uu |
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@@ -0,0 +1,24 @@ |
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+begin 664 cordic.ko.debug.bz2.uu |
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+*N2*<*$A;:>K:@``` |
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+` |
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+end
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