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linux, linux-esx: share the canister/.config logic via canister_config.inc - #1673

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dcasota:fix/kernel-shared-canister-config
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dcasota:fix/kernel-shared-canister-config

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@dcasota dcasota commented Sep 1, 2026 •

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Problem

SPECS/linux/linux.spec and SPECS/linux/linux-esx.spec each carry their own copy of the FIPS canister Kconfig handling, and the two copies are not identical: linux.spec has no fips=0 branch.

Building x86_64 without the canister — fips set to 0 — therefore leaves the # CONFIG_GCC_PLUGIN_MATCH_CANISTER_STRUCTS is not set and # CONFIG_GCC_PLUGIN_PAD_CANISTER_STRUCTS is not set lines of config_x86_64 in .config. Those symbols exist only once the canister plugin patches have been applied, so make olddefconfig silently drops them and the check_for_config_applicability.inc diff guard fails %prep. linux-esx.spec has the missing branch and passes. The aarch64 configs never carried those lines.

Change

Move the handling into a single SPECS/linux/canister_config.inc, added as Source5 and %included by both flavours. It covers the three cases in one place: canister_build, canister_usage and fips=0.

The default x86_64 FIPS builds keep the .config they had. What is new is the fips=0 cleanup in linux.spec, and that the two flavours can no longer diverge here.

🤖 Generated with Claude Code

@aabusair aabusair closed this Sep 2, 2026
@aabusair aabusair reopened this Sep 2, 2026
@dcasota
dcasota force-pushed the fix/kernel-shared-canister-config branch 5 times, most recently from 1e115b3 to a9e54a7 Compare September 9, 2026 11:16
@dcasota
dcasota force-pushed the fix/kernel-shared-canister-config branch 2 times, most recently from d28f018 to 495763b Compare September 11, 2026 19:25
@dcasota
dcasota force-pushed the fix/kernel-shared-canister-config branch from 495763b to fadc19e Compare September 13, 2026 04:50
@dcasota
dcasota force-pushed the fix/kernel-shared-canister-config branch from fadc19e to dee805a Compare September 14, 2026 09:28
@dcasota
dcasota force-pushed the fix/kernel-shared-canister-config branch 5 times, most recently from aeda1ed to af278c2 Compare September 19, 2026 11:44
@dcasota
dcasota force-pushed the fix/kernel-shared-canister-config branch 2 times, most recently from 635f42c to ab1963f Compare September 30, 2026 04:00
…g.inc

linux.spec and linux-esx.spec implemented the same canister Kconfig handling
in two different idioms, and they disagreed on one constellation.

linux-esx.spec used %if 0%{?fips} / %else, and its %else branch cleaned the
GCC_PLUGIN_{MATCH,PAD}_CANISTER_STRUCTS comments out of .config. linux.spec
instead used two independent %if canister_build / %if canister_usage blocks
with no %else, so when fips=0 nothing ran: the shipped .config kept the
"is not set" comments, make olddefconfig dropped them, and the
check_for_config_applicability.inc diff guard failed %prep. That is an
x86_64 kernel built without the canister: fips is set by %global inside
%ifarch, so it is 1 on x86_64 unless that line is edited to 0, and
config_x86_64 carries both "is not set" comments. The aarch64 configs
never carried them.

Move the three conditional blocks into SPECS/linux/canister_config.inc,
pulled in by both specs as Source5 + %include, the same mechanism both
already use for check_for_config_applicability.inc. Divergence between the
two flavours is now impossible by construction.

linux-esx.spec additionally gains the derived-flag block linux.spec already
had (canister_build=0, canister_usage=fips), nested inside the existing
%if fips so it does not shadow -D. esx never builds a canister - it untars a
prebuilt one - so fips=1 implies canister_usage=1, reproducing the old
branch exactly.

Tested across 112 cells: 2 specs x {x86_64, aarch64} x subrelease {91, 92} x
14 flag combinations of fips / canister_build / canister_usage / acvp_build /
kat_build. All x86_64 cells are byte-identical apart from the release string.
The aarch64 fips=0 cells replace PR#14's broad sed with linux-esx's narrower
pair; the two forms produce byte-identical output on all five shipped config
files, because no config contains a CANISTER_STRUCTS=y form - only the
"is not set" comment form. The esx aarch64 reordering is likewise a no-op:
the canister and jitterentropy seds touch disjoint symbols.

Change-Id: If4107c14d8f15752dff0c0f25c6b4dee504e3041
Signed-off-by: Daniel Casota <dcasota@gmail.com>
@dcasota
dcasota force-pushed the fix/kernel-shared-canister-config branch from ab1963f to 23eeef2 Compare September 30, 2026 11:49

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2 participants