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75 lines
2.5 KiB
75 lines
2.5 KiB
1 month ago
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From 5a310f31d5d42bb7a556c274c3839c34c600e9f5 Mon Sep 17 00:00:00 2001
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From: Frantisek Sumsal <frantisek@sumsal.cz>
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Date: Wed, 6 Mar 2024 15:21:10 +0100
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Subject: [PATCH] ci: explicitly change oom-{score}-adj before running tests
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For some reason root in GH actions is able to _decrease_ its oom score
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even after dropping all capabilities (including CAP_SYS_RESOURCE), until
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the oom score is changed explicitly after sudo:
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$ systemd-detect-virt
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microsoft
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$ sudo su -
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~# capsh --drop=all -- -c 'capsh --print; grep -H . /proc/self/oom*; choom -p $$ -n -101'
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Current: =
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Bounding set =
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Ambient set =
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Current IAB: !cap_chown,!cap_dac_override,!cap_dac_read_search,...,!cap_sys_resource,...,!cap_checkpoint_restore
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Securebits: 00/0x0/1'b0
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secure-noroot: no (unlocked)
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secure-no-suid-fixup: no (unlocked)
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secure-keep-caps: no (unlocked)
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secure-no-ambient-raise: no (unlocked)
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uid=0(root) euid=0(root)
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gid=0(root)
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groups=0(root)
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Guessed mode: UNCERTAIN (0)
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/proc/self/oom_adj:8
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/proc/self/oom_score:1000
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/proc/self/oom_score_adj:500
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pid 22180's OOM score adjust value changed from 500 to -101
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~# choom -p $$ -n 500
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pid 22027's OOM score adjust value changed from 500 to 500
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~# capsh --drop=all -- -c 'capsh --print; grep -H . /proc/self/oom*; choom -p $$ -n -101'
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Current: =
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Bounding set =
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Ambient set =
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...
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uid=0(root) euid=0(root)
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gid=0(root)
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groups=0(root)
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Guessed mode: UNCERTAIN (0)
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/proc/self/oom_adj:8
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/proc/self/oom_score:1000
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/proc/self/oom_score_adj:500
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choom: failed to set score adjust value: Permission denied
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I have no idea what's going on, but it breaks
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exec-oomscoreadjust-negative.service from test-execute when running
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unprivileged.
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(cherry picked from commit 7161af9612d2d4f79cfbe8ed34ea7614d08901f7)
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Related: RHEL-27512
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---
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.github/workflows/unit_tests.sh | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/.github/workflows/unit_tests.sh b/.github/workflows/unit_tests.sh
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index cb8ea332aa..6dcbc393fd 100755
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--- a/.github/workflows/unit_tests.sh
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+++ b/.github/workflows/unit_tests.sh
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@@ -41,6 +41,12 @@ set -ex
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MESON_ARGS=(-Dcryptolib=${CRYPTOLIB:-auto})
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+# (Re)set the current oom-{score-}adj. For some reason root on GH actions is able to _decrease_
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+# its oom-score even after dropping all capabilities (including CAP_SYS_RESOURCE), until the
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+# score is explicitly changed after sudo. No idea what's going on, but it breaks
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+# exec-oomscoreadjust-negative.service from test-execute when running unprivileged.
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+choom -p $$ -n 0
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+
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for phase in "${PHASES[@]}"; do
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case $phase in
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SETUP)
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