diff --git a/elfutils-0.190-fix-core-noncontig.patch b/elfutils-0.190-fix-core-noncontig.patch new file mode 100644 index 0000000..0f99a7c --- /dev/null +++ b/elfutils-0.190-fix-core-noncontig.patch @@ -0,0 +1,329 @@ +From c791d16b7dcf9d985ebe0e852481142753603353 Mon Sep 17 00:00:00 2001 +From: Aaron Merey +Date: Fri, 8 Dec 2023 16:44:35 -0500 +Subject: [PATCH] libdwfl: Correctly handle corefile non-contiguous segments + +It is possible for segments of different shared libaries to be interleaved +in memory such that the segments of one library are located in between +non-contiguous segments of another library. + +For example, this can be seen with firefox on RHEL 7.9 where multiple +shared libraries could be mapped in between ld-2.17.so segments: + + [...] + 7f0972082000-7f09720a4000 00000000 139264 /usr/lib64/ld-2.17.so + 7f09720a4000-7f09720a5000 00000000 4096 /memfd:mozilla-ipc (deleted) + 7f09720a5000-7f09720a7000 00000000 8192 /memfd:mozilla-ipc (deleted) + 7f09720a7000-7f09720a9000 00000000 8192 /memfd:mozilla-ipc (deleted) + 7f0972134000-7f0972136000 00000000 8192 /usr/lib64/firefox/libmozwayland.so + 7f0972136000-7f0972137000 00002000 4096 /usr/lib64/firefox/libmozwayland.so + 7f0972137000-7f0972138000 00003000 4096 /usr/lib64/firefox/libmozwayland.so + 7f0972138000-7f0972139000 00003000 4096 /usr/lib64/firefox/libmozwayland.so + 7f097213a000-7f0972147000 00000000 53248 /usr/lib64/firefox/libmozsqlite3.so + 7f0972147000-7f097221e000 0000d000 880640 /usr/lib64/firefox/libmozsqlite3.so + 7f097221e000-7f0972248000 000e4000 172032 /usr/lib64/firefox/libmozsqlite3.so + 7f0972248000-7f0972249000 0010e000 4096 /usr/lib64/firefox/libmozsqlite3.so + 7f0972249000-7f097224c000 0010e000 12288 /usr/lib64/firefox/libmozsqlite3.so + 7f097224c000-7f0972250000 00111000 16384 /usr/lib64/firefox/libmozsqlite3.so + 7f0972250000-7f0972253000 00000000 12288 /usr/lib64/firefox/liblgpllibs.so + [...] + 7f09722a3000-7f09722a4000 00021000 4096 /usr/lib64/ld-2.17.so + 7f09722a4000-7f09722a5000 00022000 4096 /usr/lib64/ld-2.17.so + +dwfl_segment_report_module did not account for the possibility of +interleaving non-contiguous segments, resulting in premature closure +of modules as well as failing to report modules. + +Fix this by removing segment skipping in dwfl_segment_report_module. +When dwfl_segment_report_module reported a module, it would return +the index of the segment immediately following the end address of the +current module. Since there's a chance that other modules might fall +within this address range, dwfl_segment_report_module instead returns +the index of the next segment. + +This patch also fixes premature module closure that can occur in +dwfl_segment_report_module when interleaving non-contiguous segments +are found. Previously modules with start and end addresses that overlap +with the current segment would have their build-ids compared with the +current segment's build-id. If there was a mismatch, that module would +be closed. Avoid closing modules in this case when mismatching build-ids +correspond to distinct modules. + +https://sourceware.org/bugzilla/show_bug.cgi?id=30975 + +Signed-off-by: Aaron Merey +--- + libdwfl/dwfl_segment_report_module.c | 37 +++++++++---- + tests/Makefile.am | 8 ++- + tests/dwfl-core-noncontig.c | 82 ++++++++++++++++++++++++++++ + tests/run-dwfl-core-noncontig.sh | 63 +++++++++++++++++++++ + 4 files changed, 176 insertions(+), 14 deletions(-) + create mode 100644 tests/dwfl-core-noncontig.c + create mode 100755 tests/run-dwfl-core-noncontig.sh + +diff --git a/libdwfl/dwfl_segment_report_module.c b/libdwfl/dwfl_segment_report_module.c +index 3ef62a7..09ee37b 100644 +--- a/libdwfl/dwfl_segment_report_module.c ++++ b/libdwfl/dwfl_segment_report_module.c +@@ -737,17 +737,34 @@ dwfl_segment_report_module (Dwfl *dwfl, int ndx, const char *name, + && invalid_elf (module->elf, module->disk_file_has_build_id, + &build_id)) + { +- elf_end (module->elf); +- close (module->fd); +- module->elf = NULL; +- module->fd = -1; ++ /* If MODULE's build-id doesn't match the disk file's ++ build-id, close ELF only if MODULE and ELF refer to ++ different builds of files with the same name. This ++ prevents premature closure of the correct ELF in cases ++ where segments of a module are non-contiguous in memory. */ ++ if (name != NULL && module->name[0] != '\0' ++ && strcmp (basename (module->name), basename (name)) == 0) ++ { ++ elf_end (module->elf); ++ close (module->fd); ++ module->elf = NULL; ++ module->fd = -1; ++ } + } +- if (module->elf != NULL) ++ else if (module->elf != NULL) + { +- /* Ignore this found module if it would conflict in address +- space with any already existing module of DWFL. */ ++ /* This module has already been reported. */ + skip_this_module = true; + } ++ else ++ { ++ /* Only report this module if we haven't already done so. */ ++ for (Dwfl_Module *mod = dwfl->modulelist; mod != NULL; ++ mod = mod->next) ++ if (mod->low_addr == module_start ++ && mod->high_addr == module_end) ++ skip_this_module = true; ++ } + } + if (skip_this_module) + goto out; +@@ -781,10 +798,6 @@ dwfl_segment_report_module (Dwfl *dwfl, int ndx, const char *name, + } + } + +- /* Our return value now says to skip the segments contained +- within the module. */ +- ndx = addr_segndx (dwfl, segment, module_end, true); +- + /* Examine its .dynamic section to get more interesting details. + If it has DT_SONAME, we'll use that as the module name. + If it has a DT_DEBUG, then it's actually a PIE rather than a DSO. +@@ -929,6 +942,8 @@ dwfl_segment_report_module (Dwfl *dwfl, int ndx, const char *name, + ndx = -1; + goto out; + } ++ else ++ ndx++; + + /* We have reported the module. Now let the caller decide whether we + should read the whole thing in right now. */ +diff --git a/tests/Makefile.am b/tests/Makefile.am +index 7fb8efb..9f8f769 100644 +--- a/tests/Makefile.am ++++ b/tests/Makefile.am +@@ -42,7 +42,7 @@ check_PROGRAMS = arextract arsymtest newfile saridx scnnames sectiondump \ + dwfl-bug-addr-overflow arls dwfl-bug-fd-leak \ + dwfl-addr-sect dwfl-bug-report early-offscn \ + dwfl-bug-getmodules dwarf-getmacros dwarf-ranges addrcfi \ +- dwarfcfi \ ++ dwfl-core-noncontig dwarfcfi \ + test-flag-nobits dwarf-getstring rerequest_tag \ + alldts typeiter typeiter2 low_high_pc \ + test-elf_cntl_gelf_getshdr dwflsyms dwfllines \ +@@ -212,7 +212,7 @@ TESTS = run-arextract.sh run-arsymtest.sh run-ar.sh newfile test-nlist \ + $(asm_TESTS) run-disasm-bpf.sh run-low_high_pc-dw-form-indirect.sh \ + run-nvidia-extended-linemap-libdw.sh run-nvidia-extended-linemap-readelf.sh \ + run-readelf-dw-form-indirect.sh run-strip-largealign.sh \ +- run-readelf-Dd.sh ++ run-readelf-Dd.sh run-dwfl-core-noncontig.sh + + if !BIARCH + export ELFUTILS_DISABLE_BIARCH = 1 +@@ -632,7 +632,8 @@ EXTRA_DIST = run-arextract.sh run-arsymtest.sh run-ar.sh \ + run-nvidia-extended-linemap-libdw.sh run-nvidia-extended-linemap-readelf.sh \ + testfile_nvidia_linemap.bz2 \ + testfile-largealign.o.bz2 run-strip-largealign.sh \ +- run-funcretval++11.sh ++ run-funcretval++11.sh \ ++ run-dwfl-core-noncontig.sh testcore-noncontig.bz2 + + + if USE_VALGRIND +@@ -738,6 +739,7 @@ dwfl_bug_fd_leak_LDADD = $(libeu) $(libdw) $(libebl) $(libelf) + dwfl_bug_report_LDADD = $(libdw) $(libebl) $(libelf) + dwfl_bug_getmodules_LDADD = $(libeu) $(libdw) $(libebl) $(libelf) + dwfl_addr_sect_LDADD = $(libeu) $(libdw) $(libebl) $(libelf) $(argp_LDADD) ++dwfl_core_noncontig_LDADD = $(libdw) $(libelf) + dwarf_getmacros_LDADD = $(libdw) + dwarf_ranges_LDADD = $(libdw) + dwarf_getstring_LDADD = $(libdw) +diff --git a/tests/dwfl-core-noncontig.c b/tests/dwfl-core-noncontig.c +new file mode 100644 +index 0000000..04558e2 +--- /dev/null ++++ b/tests/dwfl-core-noncontig.c +@@ -0,0 +1,82 @@ ++/* Test program for dwfl_getmodules bug. ++ Copyright (C) 2008 Red Hat, Inc. ++ This file is part of elfutils. ++ ++ This file 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. ++ ++ elfutils 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 . */ ++ ++#include ++#include ++#include ++#include ++#include ELFUTILS_HEADER(dwfl) ++#include ELFUTILS_HEADER(elf) ++ ++static const Dwfl_Callbacks cb = ++{ ++ NULL, ++ NULL, ++ NULL, ++ NULL, ++}; ++ ++int ++main (int argc, char **argv) ++{ ++ assert (argc == 2); ++ ++ Dwfl *dwfl = dwfl_begin (&cb); ++ ++ int fd = open (argv[1], O_RDONLY); ++ assert (fd != -1); ++ ++ Elf *elf = elf_begin (fd, ELF_C_READ, NULL); ++ (void) dwfl_core_file_report (dwfl, elf, argv[0]); ++ ++ /* testcore-noncontig contains a shared library mapped between ++ non-contiguous segments of another shared library: ++ ++ [...] ++ 7f14e458c000-7f14e45ae000 00000000 139264 /usr/lib64/ld-2.17.so (1) ++ 7f14e4795000-7f14e4798000 00000000 12288 /usr/lib64/firefox/liblgpllibs.so (2) ++ 7f14e4798000-7f14e479d000 00003000 20480 /usr/lib64/firefox/liblgpllibs.so ++ 7f14e479d000-7f14e479f000 00008000 8192 /usr/lib64/firefox/liblgpllibs.so ++ 7f14e479f000-7f14e47a0000 00009000 4096 /usr/lib64/firefox/liblgpllibs.so ++ 7f14e47a0000-7f14e47a1000 0000a000 4096 /usr/lib64/firefox/liblgpllibs.so (3) ++ 7f14e47ad000-7f14e47ae000 00021000 4096 /usr/lib64/ld-2.17.so (4) ++ 7f14e47ae000-7f14e47af000 00022000 4096 /usr/lib64/ld-2.17.so */ ++ ++ /* First segment of the non-contiguous module (1). */ ++ int seg = dwfl_addrsegment (dwfl, 0x7f14e458c000, NULL); ++ assert (seg == 32); ++ ++ /* First segment of the module within the non-contiguous module's address ++ range (2). */ ++ seg = dwfl_addrsegment (dwfl, 0x7f14e4795000, NULL); ++ assert (seg == 33); ++ ++ /* Last segment of the module within the non-contiguous module's ++ address range (3). */ ++ seg = dwfl_addrsegment (dwfl, 0x7f14e47a0000, NULL); ++ assert (seg == 37); ++ ++ /* First segment of non-contiguous module following its address space ++ gap (4). */ ++ seg = dwfl_addrsegment (dwfl, 0x7f14e47ad000, NULL); ++ assert (seg == 40); ++ ++ dwfl_end (dwfl); ++ elf_end (elf); ++ ++ return 0; ++} +diff --git a/tests/run-dwfl-core-noncontig.sh b/tests/run-dwfl-core-noncontig.sh +new file mode 100755 +index 0000000..1245b67 +--- /dev/null ++++ b/tests/run-dwfl-core-noncontig.sh +@@ -0,0 +1,63 @@ ++#! /bin/sh ++# Copyright (C) 2023 Red Hat, Inc. ++# This file is part of elfutils. ++# ++# This file 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. ++# ++# elfutils 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 . ++ ++. $srcdir/test-subr.sh ++ ++# Test whether libdwfl can handle corefiles containing non-contiguous ++# segments where multiple modules are contained within the address ++# space of some other module. ++ ++# testcore-noncontig was generated from the following program with ++# systemd-coredump on RHEL 7.9 Workstation, kernel ++# 3.10.0-1160.105.1.el7.x86_64. liblgpllibs.so was packaged with ++# firefox-115.4.0-1.el7_9.x86_64.rpm. ++ ++# #include ++# #include ++# ++# int main () { ++# dlopen ("/usr/lib64/firefox/liblgpllibs.so", RTLD_GLOBAL | RTLD_NOW); ++# sleep (60); ++# return 0; ++# } ++# ++# gcc -ldl -o test test.c ++ ++tempfiles out ++testfiles testcore-noncontig ++ ++testrun ${abs_builddir}/dwfl-core-noncontig testcore-noncontig ++ ++# Remove parts of the output that could change depending on which ++# libraries are locally installed. ++testrun ${abs_top_builddir}/src/unstrip -n --core testcore-noncontig \ ++ | sed 's/+/ /g' | cut -d " " -f1,3 | sort > out ++ ++testrun_compare cat out <<\EOF ++0x400000 3a1748a544b40a38b3be3d2d13ffa34a2a5a71c0@0x400284 ++0x7f14e357e000 edf51350c7f71496149d064aa8b1441f786df88a@0x7f14e357e1d8 ++0x7f14e3794000 7615604eaf4a068dfae5085444d15c0dee93dfbd@0x7f14e37941d8 ++0x7f14e3a96000 09cfb171310110bc7ea9f4476c9fa044d85baff4@0x7f14e3a96210 ++0x7f14e3d9e000 e10cc8f2b932fc3daeda22f8dac5ebb969524e5b@0x7f14e3d9e248 ++0x7f14e3fba000 fc4fa58e47a5acc137eadb7689bce4357c557a96@0x7f14e3fba280 ++0x7f14e4388000 7f2e9cb0769d7e57bd669b485a74b537b63a57c4@0x7f14e43881d8 ++0x7f14e458c000 62c449974331341bb08dcce3859560a22af1e172@0x7f14e458c1d8 ++0x7f14e4795000 175efdcef445455872a86a6fbee7567ca16a513e@0x7f14e4795248 ++0x7ffcfe59f000 80d79b32785868a2dc10047b39a80d1daec8923d@0x7ffcfe59f328 ++EOF ++ ++exit 0 +-- +2.43.0 + diff --git a/elfutils.spec b/elfutils.spec index 7209ab1..6fabb9e 100644 --- a/elfutils.spec +++ b/elfutils.spec @@ -1,11 +1,12 @@ Name: elfutils Version: 0.190 -%global baserelease 1 +%global baserelease 2 Release: %{baserelease}%{?dist} URL: http://elfutils.org/ %global source_url ftp://sourceware.org/pub/elfutils/%{version}/ License: GPLv3+ and (GPLv2+ or LGPLv3+) and GFDL Source: %{?source_url}%{name}-%{version}.tar.bz2 +Source1: testcore-noncontig.bz2 Summary: A collection of utilities and DSOs to handle ELF files and DWARF data # Needed for isa specific Provides and Requires. @@ -64,7 +65,8 @@ BuildRequires: gettext-devel %endif # Patches - +# RHEL-18913: Fix handling of corefiles with non-contiguous segments. +Patch1: elfutils-0.190-fix-core-noncontig.patch %description Elfutils is a collection of utilities, including stack (to show @@ -265,6 +267,8 @@ autoreconf -f -v -i # are executable. find . -name \*.sh ! -perm -0100 -print | xargs chmod +x +cp %{SOURCE1} tests + %build # Remove -Wall from default flags. The makefiles enable enough warnings # themselves, and they use -Werror. Appending -Wall defeats the cases where @@ -455,6 +459,9 @@ exit 0 %systemd_postun_with_restart debuginfod.service %changelog +* Fri Dec 8 2023 Aaron Merey - 0.190-2 +- Add elfutils-0.190-fix-core-noncontig.patch + * Fri Nov 3 2023 Mark Wielaard - 0.190-1 - Upgrade to upstream elfutils 0.190 - Add eu-srcfiles diff --git a/testcore-noncontig.bz2 b/testcore-noncontig.bz2 new file mode 100644 index 0000000..514ad01 Binary files /dev/null and b/testcore-noncontig.bz2 differ