This patch series is intended for use alongside the Implement DWARF
modversions series [1] to enable RUST and MODVERSIONS at the same
time.
Elsewhere, we've seen a desire for long symbol name support for LTO
symbol names [2], and the previous series came up [3] as a possible
solution rather than hashing, which some have objected [4] to.
This series adds a MODVERSIONS format which uses a section per column.
This avoids userspace tools breaking if we need to make a similar change
to the format in the future - we would do so by adding a new section,
rather than editing the struct definition. In the new format, the name
section is formatted as a concatenated sequence of NUL-terminated
strings, which allows for arbitrary length names.
Emitting the extended format is guarded by CONFIG_EXTENDED_MODVERSIONS,
but the kernel always knows how to validate both the original and
extended formats.
Selecting RUST and MODVERSIONS is now possible if GENDWARFKSYMS is
selected, and will implicitly select EXTENDED_MODVERSIONS.
This series depends upon the module verification refactor patches [5]
that were split off of v5, and DWARF-based versions [1].
[1] https://lore.kernel.org/lkml/20241030170106.1501763-21-samitolvanen@google.com/
[2] https://lore.kernel.org/lkml/20240605032120.3179157-1-song@kernel.org/
[3] https://lore.kernel.org/lkml/ZoxbEEsK40ASi1cY@bombadil.infradead.org/
[4] https://lore.kernel.org/lkml/0b2697fd-7ab4-469f-83a6-ec9ebc701ba0@suse.com/
[5] https://lore.kernel.org/linux-modules/20241015231651.3851138-1-mmaurer@google.com/T/#t
Changes in v8:
- Rebased onto latest version of Sami's series, on top of v6.12-rc5
- Pass --stable when KBUILD_GENDWARFKSYMS_STABLE is set.
- Flipped MODVERSIONS/GENDWARFKSYMS order in deps for CONFIG_RUST
- Picked up trailers
v7: https://lore.kernel.org/r/20241023-extended-modversions-v7-0-339787b43373@google.com
- Fix modpost to detect EXTENDED_MODVERSIONS based on a flag
- Drop patches to fix export_report.pl
- Switch from conditional compilation in .mod.c to conditional emission
in modpost
- Factored extended modversion emission into its own function
- Allow RUST + MODVERSIONS if GENDWARFKSYMS is enabled by selecting
EXTENDED_MODVERSIONS
v6: https://lore.kernel.org/lkml/20241015231925.3854230-1-mmaurer@google.com/
- Splits verification refactor Luis requested out to a separate change
- Clarifies commits around export_report.pl repairs
- Add CONFIG_EXTENDED_MODVERSIONS to control whether extended
information is included in the module, per Luis's request.
v5: https://lore.kernel.org/all/20240925233854.90072-1-mmaurer@google.com/
- Addresses Sami's comments from v3 that I missed in v4 (missing early
return, extra parens)
v4: https://lore.kernel.org/asahi/20240924212024.540574-1-mmaurer@google.com/
- Fix incorrect dot munging in PPC
v3: https://lore.kernel.org/lkml/87le0w2hop.fsf@mail.lhotse/T/
- Split up the module verification refactor into smaller patches, per
Greg K-H's suggestion.
v2: https://lore.kernel.org/all/20231118025748.2778044-1-mmaurer@google.com/
- Add loading/verification refactor before modifying, per Luis's request
v1: https://lore.kernel.org/rust-for-linux/20231115185858.2110875-1-mmaurer@google.com/
--
2.47.0.rc1.288.g06298d1525-goog
---
Matthew Maurer (2):
modules: Support extended MODVERSIONS info
modpost: Produce extended MODVERSIONS information
Sami Tolvanen (1):
rust: Use gendwarfksyms + extended modversions for CONFIG_MODVERSIONS
arch/powerpc/kernel/module_64.c | 24 ++++++++++-
init/Kconfig | 3 +-
kernel/module/Kconfig | 10 +++++
kernel/module/internal.h | 11 +++++
kernel/module/main.c | 92 +++++++++++++++++++++++++++++++++++++----
kernel/module/version.c | 45 ++++++++++++++++++++
rust/Makefile | 33 ++++++++++++++-
scripts/Makefile.modpost | 1 +
scripts/mod/modpost.c | 65 +++++++++++++++++++++++++++--
9 files changed, 267 insertions(+), 17 deletions(-)
---
base-commit: ac746e6156c4d6d7b46ba2102acf644ea2aa4aac
change-id: 20241022-extended-modversions-a7b44dfbfff1
prerequisite-message-id: <20241015231651.3851138-1-mmaurer@google.com>
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prerequisite-message-id: <20241030170106.1501763-21-samitolvanen@google.com>
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prerequisite-patch-id: c21f85ffe5c7684c1ffc87af716e2e50498d5c92
prerequisite-patch-id: a372f88626c3dda51eab6c6af132a76141ff20cc
prerequisite-patch-id: 57d2fe708769154a6494fb1fece56911dea00687
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prerequisite-patch-id: 624e6794e5003cff734873894c2343595b45244b
Best regards,
--
Matthew Maurer <mmaurer@google.com>