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Bump minimum kernel baseline to 5.4, recommended version to 5.7

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As requested, a list of kernel version to feature mapping
for kernels older than minimum baseline is also included,
in order to ease potential backport work.
This commit is contained in:
Mike Yuan
2025-01-07 18:28:33 +01:00
committed by Lennart Poettering
parent 0dfd89fa32
commit 16ac586e5a
2 changed files with 22 additions and 16 deletions
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35
README
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@@ -29,38 +29,43 @@ LICENSE:
LGPL-2.1-or-later for all code, exceptions noted in LICENSES/README.md
REQUIREMENTS:
Linux kernel ≥ 4.3
Linux kernel ≥ 3.15 for timerfd_create() CLOCK_BOOTTIME support
≥ 3.17 for memfd_create() and getrandom()
≥ 4.3 for ambient capabilities
≥ 4.5 for pids controller in cgroup v2
≥ 4.6 for cgroup namespaces
≥ 4.9 for RENAME_NOREPLACE support in vfat
≥ 4.10 for cgroup-bpf egress and ingress hooks
≥ 4.11 for nsfs
# FIXME: drop compat glue and remove entries above before v258
≥ 4.11 for nsfs NS_GET_NSTYPE
≥ 4.15 for cgroup-bpf device hook and cpu controller in cgroup v2
≥ 4.17 for cgroup-bpf socket address hooks and /sys/power/resume_offset
≥ 4.20 for PSI (used by systemd-oomd)
≥ 5.2 for cgroup freezer
≥ 5.3 for bounded loops in BPF program
≥ 5.4 for pidfd, new mount API, and signed Verity images
≥ 5.6 for getrandom() GRND_INSECURE
⛔ Kernel versions below 5.4 ("minimum baseline") are not supported at all,
and are missing required functionality as listed above.
# FIXME: actually drop compat glue before v258
Linux kernel ≥ 5.6 for getrandom() GRND_INSECURE
≥ 5.7 for CLONE_INTO_CGROUP, BPF links and the BPF LSM hook
≥ 5.8 for LOOP_CONFIGURE and STATX_ATTR_MOUNT_ROOT
⚠️ Kernel versions below 5.7 ("recommended baseline") have significant gaps
in functionality and are not recommended for use with this version
of systemd. Taint flag 'old-kernel' will be set. systemd will most likely
still function, but upstream support and testing are limited.
Linux kernel ≥ 5.8 for LOOP_CONFIGURE and STATX_ATTR_MOUNT_ROOT
≥ 5.9 for close_range()
≥ 5.14 for cgroup.kill
≥ 6.3 for MFD_EXEC/MFD_NOEXEC_SEAL and tmpfs noswap option
≥ 6.5 for name_to_handle_at() AT_HANDLE_FID, SO_PEERPIDFD/SO_PASSPIDFD,
and MOVE_MOUNT_BENEATH
≥ 6.9 for pidfs
⛔ Kernel versions below 4.11 ("minimum baseline") are not supported at
all, and are missing required functionality (e.g. CLOCK_BOOTTIME support
for timerfd_create(), getrandom(), ambient capabilities, memfd_create(),
or nsfs (NS_GET_NSTYPE)).
⚠️ Kernel versions below 5.4 ("recommended baseline") have significant
gaps in functionality and are not recommended for use with this version
of systemd (e.g. lack race-free process tracking by pidfd and new mount API
support). Taint flag 'old-kernel' will be set. systemd will most likely
still function, but upstream support and testing are limited.
✅ systemd utilizes several new kernel APIs, but will fall back gracefully
when unavailable.
Kernel Config Options:
CONFIG_DEVTMPFS