MSVSphere Packaging Team
1 year ago
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From ea011ddb65272c74d6378deae3f3a3365aadd77d Mon Sep 17 00:00:00 2001
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From: Romain Geissler <romain.geissler@amadeus.com>
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Date: Tue, 20 Jun 2023 16:06:31 +0000
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Subject: [PATCH] elf-util: discard PT_LOAD segment early based on the start
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address.
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Indeed when iterating over all the PT_LOAD segment of the core dump
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while trying to look for the elf headers of a given module, we iterate
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over them all and try to use the first one for which we can parse a
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package metadata, but the start address is never taken into account,
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so absolutely nothing guarantees we actually parse the right ELF header
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of the right module we are currently iterating on.
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This was tested like this:
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- Create a core dump using sleep on a fedora 37 container, with an
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explicit LD_PRELOAD of a library having a valid package metadata:
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podman run -t -i --rm -v $(pwd):$(pwd) -w $(pwd) fedora:37 bash -x -c \
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'LD_PRELOAD=libreadline.so.8 sleep 1000 & SLEEP_PID="$!" && sleep 1 && kill -11 "${SLEEP_PID}" && mv "core.${SLEEP_PID}" the-core'
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- Then from a fedora 38 container with systemd installed, the resulting
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core dump has been passed to systemd-coredump with and without this
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patch. Without this patch, we get:
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Module /usr/bin/sleep from rpm bash-5.2.15-3.fc38.x86_64
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Module /usr/lib64/libtinfo.so.6.3 from rpm coreutils-9.1-8.fc37.x86_64
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Module /usr/lib64/libc.so.6 from rpm coreutils-9.1-8.fc37.x86_64
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Module /usr/lib64/libreadline.so.8.2 from rpm coreutils-9.1-8.fc37.x86_64
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Module /usr/lib64/ld-linux-x86-64.so.2 from rpm coreutils-9.1-8.fc37.x86_64
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While with this patch we get:
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Module /usr/bin/sleep from rpm bash-5.2.15-3.fc38.x86_64
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Module /usr/lib64/libtinfo.so.6.3 from rpm ncurses-6.3-5.20220501.fc37.x86_64
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Module /usr/lib64/libreadline.so.8.2 from rpm readline-8.2-2.fc37.x86_64
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So the parsed package metadata reported by systemd-coredump when the module
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files are not found on the host (ie the case of crash inside a container) are
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now correct. The inconsistency of the first module in the above example
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(sleep is indeed not provided by the bash package) can be ignored as it
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is a consequence of how this was tested.
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In addition to this, this also fixes the performance issue of
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systemd-coredump in case of the crashing process uses a large number of
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shared libraries and having no package metadata, as reported in
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https://sourceware.org/pipermail/elfutils-devel/2023q2/006225.html.
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(cherry picked from commit 21a2c735e2bfdc3bfdc42f894d6e3d00f4a38dcd)
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Resolves: #2222259
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---
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src/shared/elf-util.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/src/shared/elf-util.c b/src/shared/elf-util.c
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index 181735409d..d746f3ab3f 100644
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--- a/src/shared/elf-util.c
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+++ b/src/shared/elf-util.c
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@@ -538,6 +538,10 @@ static int module_callback(Dwfl_Module *mod, void **userdata, const char *name,
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if (!program_header || program_header->p_type != PT_LOAD)
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continue;
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+ /* This PT_LOAD segment doesn't contain the start address, so it can't be the module we are looking for. */
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+ if (start < program_header->p_vaddr || start >= program_header->p_vaddr + program_header->p_memsz)
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+ continue;
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+
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/* Now get a usable Elf reference, and parse the notes from it. */
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data = sym_elf_getdata_rawchunk(elf,
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program_header->p_offset,
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@ -0,0 +1,40 @@
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From 2fcb340ec5faf51a8d9b0cb2ddd8386b4db6a33d Mon Sep 17 00:00:00 2001
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From: Romain Geissler <romain.geissler@amadeus.com>
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Date: Thu, 22 Jun 2023 16:05:18 +0000
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Subject: [PATCH] elf-util: check for overflow when computing end of core's
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PT_LOAD segments
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(cherry picked from commit 3965f173eae4701a014113cfaf4a28a6bb63bed7)
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Resolves: #2222259
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---
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src/shared/elf-util.c | 9 ++++++++-
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1 file changed, 8 insertions(+), 1 deletion(-)
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diff --git a/src/shared/elf-util.c b/src/shared/elf-util.c
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index d746f3ab3f..bde5013b92 100644
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--- a/src/shared/elf-util.c
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+++ b/src/shared/elf-util.c
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@@ -532,14 +532,21 @@ static int module_callback(Dwfl_Module *mod, void **userdata, const char *name,
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for (size_t i = 0; i < n_program_headers; ++i) {
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GElf_Phdr mem, *program_header;
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Elf_Data *data;
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+ GElf_Addr end_of_segment;
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/* The core file stores the ELF files in the PT_LOAD segment. */
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program_header = sym_gelf_getphdr(elf, i, &mem);
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if (!program_header || program_header->p_type != PT_LOAD)
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continue;
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+ /* Check that the end of segment is a valid address. */
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+ if (__builtin_add_overflow(program_header->p_vaddr, program_header->p_memsz, &end_of_segment)) {
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+ log_error("Abort due to corrupted core dump, end of segment address %#zx + %#zx overflows", (size_t)program_header->p_vaddr, (size_t)program_header->p_memsz);
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+ return DWARF_CB_ABORT;
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+ }
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+
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/* This PT_LOAD segment doesn't contain the start address, so it can't be the module we are looking for. */
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- if (start < program_header->p_vaddr || start >= program_header->p_vaddr + program_header->p_memsz)
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+ if (start < program_header->p_vaddr || start >= end_of_segment)
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continue;
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/* Now get a usable Elf reference, and parse the notes from it. */
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From 6c4090a8bdf54928e43c21d7443d2e6825ed6d1f Mon Sep 17 00:00:00 2001
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From: Jan Macku <jamacku@redhat.com>
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Date: Tue, 9 May 2023 13:15:06 +0200
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Subject: [PATCH] manager: don't taint the host if cgroups v1 is used
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In upstream of systemd, cgroups v1 are not considered as supported.
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This is not true for RHEL, don't taint the host when cgroups v1 are enabled.
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rhel-only
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Resolves: #2196479
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---
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man/org.freedesktop.systemd1.xml | 6 ------
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src/core/manager.c | 3 ---
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src/test/test-manager.c | 5 -----
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3 files changed, 14 deletions(-)
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diff --git a/man/org.freedesktop.systemd1.xml b/man/org.freedesktop.systemd1.xml
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index 40510c43eb..13a84af747 100644
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--- a/man/org.freedesktop.systemd1.xml
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+++ b/man/org.freedesktop.systemd1.xml
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@@ -1589,12 +1589,6 @@ node /org/freedesktop/systemd1 {
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<listitem><para>Support for cgroups is unavailable.</para></listitem>
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</varlistentry>
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- <varlistentry>
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- <term><literal>cgroupsv1</literal></term>
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-
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- <listitem><para>The system is using the old cgroup hierarchy.</para></listitem>
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- </varlistentry>
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-
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<varlistentry>
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<term><literal>local-hwclock</literal></term>
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diff --git a/src/core/manager.c b/src/core/manager.c
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index a59afafb58..657263eb73 100644
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--- a/src/core/manager.c
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+++ b/src/core/manager.c
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@@ -4491,9 +4491,6 @@ char* manager_taint_string(const Manager *m) {
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if (access("/proc/cgroups", F_OK) < 0)
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stage[n++] = "cgroups-missing";
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- if (cg_all_unified() == 0)
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- stage[n++] = "cgroupsv1";
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-
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if (clock_is_localtime(NULL) > 0)
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stage[n++] = "local-hwclock";
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diff --git a/src/test/test-manager.c b/src/test/test-manager.c
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index 89f9277b28..2faf715d76 100644
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--- a/src/test/test-manager.c
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+++ b/src/test/test-manager.c
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@@ -14,11 +14,6 @@ TEST(manager_taint_string) {
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* to test for them. Let's do just one. */
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assert_se(!strstr(a, "split-usr"));
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- if (cg_all_unified() == 0)
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- assert_se(strstr(a, "cgroupsv1"));
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- else
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- assert_se(!strstr(a, "cgroupsv1"));
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-
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m.taint_usr = true;
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_cleanup_free_ char *b = manager_taint_string(&m);
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assert_se(b);
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