ci: add bpftool workaround to coverity too

(cherry picked from commit d29f181cf02100c146fc8691a5515a708d06ddbf)

.github/workflows/build-test.sh

@@ -47,6 +47,7 @@ PACKAGES=(
     libxkbcommon-dev
     libxtables-dev
     libzstd-dev
+    linux-tools-generic
     mold
     mount
     net-tools
@@ -143,6 +144,12 @@ sudo apt-get -y install "${PACKAGES[@]}"
 pip3 install --user -r .github/workflows/requirements.txt --require-hashes --break-system-packages
 export PATH="$HOME/.local/bin:$PATH"
 
+# TODO: drop after we switch to ubuntu 26.04
+bpftool_dir=$(dirname "$(find /usr/lib/linux-tools/ /usr/lib/linux-tools-* -name 'bpftool' -perm /u=x 2>/dev/null | sort -r | head -n1)")
+if [ -n "$bpftool_dir" ]; then
+    export PATH="$bpftool_dir:$PATH"
+fi
+
 if [[ -n "$CUSTOM_PYTHON" ]]; then
     # If CUSTOM_PYTHON is set we need to pull jinja2 from pip, as a local interpreter is used
     pip3 install --user --break-system-packages jinja2

.github/workflows/codeql.yml

@@ -50,7 +50,14 @@ jobs:
         languages: ${{ matrix.language }}
         config-file: ./.github/codeql-config.yml
 
-    - run: sudo -E .github/workflows/unit-tests.sh SETUP
+    - run: |
+        sudo -E .github/workflows/unit-tests.sh SETUP
+        # TODO: drop after we switch to ubuntu 26.04
+        bpftool_binary=$(find /usr/lib/linux-tools/ /usr/lib/linux-tools-* -name 'bpftool' -perm /u=x 2>/dev/null | sort -r | head -n1)
+        if [ -n "$bpftool_binary" ]; then
+          sudo rm -f /usr/{bin,sbin}/bpftool
+          sudo ln -s "$bpftool_binary" /usr/bin/
+        fi
 
     - name: Autobuild
       uses: github/codeql-action/autobuild@51f77329afa6477de8c49fc9c7046c15b9a4e79d

.github/workflows/coverity.yml

@@ -25,6 +25,13 @@ jobs:
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
       # Reuse the setup phase of the unit test script to avoid code duplication
       - name: Install build dependencies
-        run: sudo -E .github/workflows/unit-tests.sh SETUP
+        run: |
+          sudo -E .github/workflows/unit-tests.sh SETUP
+          # TODO: drop after we switch to ubuntu 26.04
+          bpftool_binary=$(find /usr/lib/linux-tools/ /usr/lib/linux-tools-* -name 'bpftool' -perm /u=x 2>/dev/null | sort -r | head -n1)
+          if [ -n "$bpftool_binary" ]; then
+            sudo rm -f /usr/{bin,sbin}/bpftool
+            sudo ln -s "$bpftool_binary" /usr/bin/
+          fi
       - name: Build & upload the results
         run: tools/coverity.sh

.github/workflows/unit-tests.sh

@@ -18,6 +18,7 @@ ADDITIONAL_DEPS=(
     libtss2-dev
     libxkbcommon-dev
     libzstd-dev
+    linux-tools-generic
     python3-libevdev
     python3-pip
     python3-pyelftools
@@ -74,6 +75,12 @@ for phase in "${PHASES[@]}"; do
             capsh --drop=all -- -c "stat $PWD/meson.build"
             ;;
         RUN|RUN_GCC|RUN_CLANG|RUN_CLANG_RELEASE)
+            # TODO: drop after we switch to ubuntu 26.04
+            bpftool_dir=$(dirname "$(find /usr/lib/linux-tools/ /usr/lib/linux-tools-* -name 'bpftool' -perm /u=x 2>/dev/null | sort -r | head -n1)")
+            if [ -n "$bpftool_dir" ]; then
+                export PATH="$bpftool_dir:$PATH"
+            fi
+
             if [[ "$phase" =~ ^RUN_CLANG ]]; then
                 export CC=clang
                 export CXX=clang++
@@ -105,6 +112,12 @@ for phase in "${PHASES[@]}"; do
             TZ=GMT+12 meson test "${MESON_TEST_ARGS[@]}" -C build --print-errorlogs
             ;;
         RUN_ASAN_UBSAN|RUN_GCC_ASAN_UBSAN|RUN_CLANG_ASAN_UBSAN|RUN_CLANG_ASAN_UBSAN_NO_DEPS)
+            # TODO: drop after we switch to ubuntu 26.04
+            bpftool_dir=$(dirname "$(find /usr/lib/linux-tools/ /usr/lib/linux-tools-* -name 'bpftool' -perm /u=x 2>/dev/null | sort -r | head -n1)")
+            if [ -n "$bpftool_dir" ]; then
+                export PATH="$bpftool_dir:$PATH"
+            fi
+
             MESON_ARGS=(--optimization=1)
 
             if [[ "$phase" =~ ^RUN_CLANG_ASAN_UBSAN ]]; then

src/core/unit.c

@@ -5551,11 +5551,11 @@ int unit_fork_helper_process(Unit *u, const char *name, bool into_cgroup, PidRef
          * with the child's PID. */
 
         if (into_cgroup) {
-                (void) unit_realize_cgroup(u);
+                r = unit_realize_cgroup(u);
+                if (r < 0)
+                        return r;
 
-                crt = unit_setup_cgroup_runtime(u);
-                if (!crt)
-                        return -ENOMEM;
+                crt = unit_get_cgroup_runtime(u);
         }
 
         r = safe_fork(name, FORK_REOPEN_LOG|FORK_DEATHSIG_SIGTERM, &pid);
@@ -6005,7 +6005,9 @@ int unit_prepare_exec(Unit *u) {
 
         /* Prepares everything so that we can fork of a process for this unit */
 
-        (void) unit_realize_cgroup(u);
+        r = unit_realize_cgroup(u);
+        if (r < 0)
+                return r;
 
         CGroupRuntime *crt = unit_get_cgroup_runtime(u);
         if (crt && crt->reset_accounting) {

test/units/TEST-19-CGROUP.abort-on-cgroup-creation-failure.sh

@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: LGPL-2.1-or-later
+set -ex
+set -o pipefail
+
+# Test that the service is not invoked if the cgroup cannot be created.
+
+# It seems openSUSE kernel (at least kernel-default-6.16.8-1.1.x86_64.rpm) has a
+# bag in kernel oom killer or clone3 syscall, and spawning executor on a cgroup
+# with too small MemoryMax= triggers infinite loop of OOM kill, and posix_spawn()
+# will never return, and the service manager will stuck.
+####
+# [  119.776797] systemd invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=0
+# [  119.776859] CPU: 1 UID: 0 PID: 1472 Comm: systemd Not tainted 6.16.8-1-default #1 PREEMPT(voluntary) openSUSE Tumbleweed  6c85865973e4ae641870ed68afe8933a6986c974
+# [  119.776865] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-5.fc42 04/01/2014
+# [  119.776867] Call Trace:
+# (snip)
+# [  119.778126] Out of memory and no killable processes...
+####
+# On other distributions, the oom killer is triggered, but clone3 immediately
+# fails with ENOMEM, and such problematic loop does not happen.
+. /etc/os-release
+if [[ "$ID" =~ opensuse ]]; then
+    echo "Skipping cgroup test with too small MemoryMax= setting on openSUSE."
+    exit 0
+fi
+
+cat >/run/systemd/system/testslice.slice <<EOF
+[Slice]
+MemoryMax=1
+EOF
+
+cat >/run/systemd/system/testservice.service <<EOF
+[Service]
+Type=oneshot
+ExecStart=cat /proc/self/cgroup
+Slice=testslice.slice
+EOF
+
+systemctl daemon-reload
+(! systemctl start testservice.service)
+
+rm /run/systemd/system/testslice.slice
+rm /run/systemd/system/testservice.service
+
+exit 0