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commit cfdb8300f6e3aed0abc41406a3c4737eb1192067
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Author: Michal Domonkos <mdomonko@redhat.com>
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Date:   Sun Jul 11 18:08:26 2021 +0200
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    Don't brp-strip .ko files
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    Otherwise SecureBoot signatures may be stripped too.
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    We used to exclude shared libraries from this strip as they were
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    supposed to be covered by another brp script (brp-strip-shared), however
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    it turned out the latter was never really used, so we removed the
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    exclusion in commit 0ab151ab138fd4fb6d3176fd0270d9cc6f4623f3.
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    As it turns out, that was a little too ambitious, since we may now
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    inadvertently strip SecureBoot signatures from kernel modules too,
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    provided that they're made during the build, prior to the invocation of
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    brp-strip.
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    Note that this regression currently does *not* affect the following two
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    cases on Fedora/RHEL systems with redhat-rpm-config installed:
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      - in-tree kernel modules; these are built from kernel.spec which
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        already contains a hack ensuring that module signing only happens
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        *after* any stripping (see %__modsign_install_post in kernel.spec)
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      - out-of-tree kernel modules built with debuginfo enabled; this is
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        because brp-strip is only called when %debug_package is set to
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        %{nil}
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    Any other combinations may be affected, depending on the macros and
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    .spec files used, so let's fix this by effectively "reverting" said
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    commit for .ko files only.
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    Fixes: rhbz#1967291
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    Backported into 4.14.3
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diff -up rpm-4.14.3/scripts/brp-strip.orig rpm-4.14.3/scripts/brp-strip
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--- rpm-4.14.3/scripts/brp-strip.orig	2021-07-12 17:21:04.446396789 +0200
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+++ rpm-4.14.3/scripts/brp-strip	2021-07-12 17:21:20.673633783 +0200
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@@ -12,7 +12,7 @@ Darwin*) exit 0 ;;
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 esac
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 # Strip ELF binaries
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-for f in `find "$RPM_BUILD_ROOT" -type f -exec file {} \; | \
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+for f in `find "$RPM_BUILD_ROOT" -type f \! -name "*.ko" -exec file {} \; | \
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         grep -v "^${RPM_BUILD_ROOT}/\?usr/lib/debug"  | \
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 	sed -n -e 's/^\(.*\):[ 	]*ELF.*, not stripped.*/\1/p'`; do
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 	$STRIP -g "$f" || :