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221 lines
11 KiB
221 lines
11 KiB
6 years ago
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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 $" {
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+ untested "powerpc:common64 is not supported"
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+ }
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+}
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Index: gdb-7.6.1/gdb/testsuite/gdb.arch/cordic.ko.bz2.uu
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===================================================================
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--- /dev/null
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+++ gdb-7.6.1/gdb/testsuite/gdb.arch/cordic.ko.bz2.uu
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@@ -0,0 +1,53 @@
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+begin 664 cordic.ko.bz2.uu
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+M0EIH.3%!62936:QR$J<`!:7____________^___________]__O_U__]_N]]
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+M$>IZADTR`/4]0#(T,U&@]0#0`9`,FC33&IM(S4!M30`:``:-&@`TT0`````&
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+M@```!H#(`````````-``-&@`````````:&@-```R:`2)(2GHIYI,F%-E/4T&
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||
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+#Y"5.
|
||
|
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+`
|
||
|
|
+end
|
||
|
|
Index: gdb-7.6.1/gdb/testsuite/gdb.arch/cordic.ko.debug.bz2.uu
|
||
|
|
===================================================================
|
||
|
|
--- /dev/null
|
||
|
|
+++ gdb-7.6.1/gdb/testsuite/gdb.arch/cordic.ko.debug.bz2.uu
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||
|
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@@ -0,0 +1,24 @@
|
||
|
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+begin 664 cordic.ko.debug.bz2.uu
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||
|
|
+MLR"24H($(R60S'.$.0^K9F@,AZ&K`@I92T5.3:4H@=-7S'#/C,1QSD%>INN_
|
||
|
|
+MT#7-^3M?A9*J-8-<-'1M[-.*2H<Y0M)B'-Y(3XMHL#)[--X-<BGOA\YO#T,(
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||
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|
+M,AEB@'L$[^WOL#7!:ID4FH5S_!;7O`M!KRV?T3%):X7H+A!38."$$X!D+S@4
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+MP3/-VM<9?0%-"Z.(MVYY(FE7$V?"QM'CX*6-4;^9,4A1\1$4<"4GCOX3S(:1
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+MY[`HM?>82JW<$8<LTV:J##D"KBRIUZS2>`0=$2U,`K^AD\-A$N6%@!,)D\40
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|
+MG+A5S!8)K\D>T%$6+5VX1Q3?#S@85E<O5&TQ;KCX)9$]Y54IR%L'KW<C)87T
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||
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|
+M718+9P'1>LW\N1-;@7B98=FRJ21(E>-R[9:8#GQ6&((U`"<&M?(D**&1(`:P
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|
+MAXD/K49))+)4^H3%*:%H4QQ2+J4.>B,&7.N<`R,SB0A!LB3&(`J?03!*`8:!
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+M$Z0H8&G/30D@`M$O`Z5)%-CU'QCR@Z6&_RJIJ@M5&8H8&$O*6ESP4],\P7^+
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||
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|
+*N2*<*$A;:>K:@```
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||
|
|
+`
|
||
|
|
+end
|