On 04/11/25 4:47 pm, Samir M wrote:
Hello,
I am observing below error while running the make modules_install
command on latest mainline kernel on IBM Power11 server.
Error:
DEPMOD /lib/modules/6.18.0-rc4
depmod: ERROR: kmod_builtin_iter_next:
unexpected string without modname prefix
IBM CI has also reported this error.
Error:
depmod: ERROR: kmod_builtin_iter_next: unexpected string without modname
prefix
INSTALL /boot
depmod: ERROR: kmod_builtin_iter_next: unexpected string without modname
prefix
depmod: ERROR: kmod_builtin_iter_next: unexpected string without modname
prefix
Git bisect is pointing to below commit as first bad commit.
d50f21091358b2b29dc06c2061106cdb0f030d03 is the first bad commit
commit d50f21091358b2b29dc06c2061106cdb0f030d03
Author: Dimitri John Ledkov <[email protected]>
Date: Sun Oct 26 20:21:00 2025 +0000
kbuild: align modinfo section for Secureboot Authenticode EDK2 compat
Previously linker scripts would always generate vmlinuz that has
sections
aligned. And thus padded (correct Authenticode calculation) and
unpadded
calculation would be same. As in https://github.com/rhboot/pesign
userspace
tool would produce the same authenticode digest for both of the
following
commands:
pesign --padding --hash --in ./arch/x86_64/boot/bzImage
pesign --nopadding --hash --in ./arch/x86_64/boot/bzImage
The commit 3e86e4d74c04 ("kbuild: keep .modinfo section in
vmlinux.unstripped") added .modinfo section of variable length.
Depending
on kernel configuration it may or may not be aligned.
All userspace signing tooling correctly pads such section to
calculation
spec compliant authenticode digest.
However, if bzImage is not further processed and is attempted to be
loaded
directly by EDK2 firmware, it calculates unpadded Authenticode
digest and
fails to correct accept/reject such kernel builds even when propoer
Authenticode values are enrolled in db/dbx. One can say EDK2 requires
aligned/padded kernels in Secureboot.
Thus add ALIGN(8) to the .modinfo section, to esure kernels
irrespective of
modinfo contents can be loaded by all existing EDK2 firmware builds.
Fixes: 3e86e4d74c04 ("kbuild: keep .modinfo section in
vmlinux.unstripped")
Cc: [email protected]
Signed-off-by: Dimitri John Ledkov <[email protected]>
Link:
https://patch.msgid.link/[email protected]
Signed-off-by: Nathan Chancellor <[email protected]>
include/asm-generic/vmlinux.lds.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Git Bisect log:
git bisect log
git bisect start
# status: waiting for both good and bad commits
# bad: [c9cfc122f03711a5124b4aafab3211cf4d35a2ac] Merge tag
'for-6.18-rc4-tag' of
git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
git bisect bad c9cfc122f03711a5124b4aafab3211cf4d35a2ac
# status: waiting for good commit(s), bad commit known
# good: [dcb6fa37fd7bc9c3d2b066329b0d27dedf8becaa] Linux 6.18-rc3
git bisect good dcb6fa37fd7bc9c3d2b066329b0d27dedf8becaa
# good: [3ad81aa52085a7e67edfa4bc8f518e5962196bb3] Merge tag 'v6.18-p4'
of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
git bisect good 3ad81aa52085a7e67edfa4bc8f518e5962196bb3
# good: [f414f9fd68797182f8de4e1cd9855b6b28abde99] Merge tag
'pci-v6.18-fixes-4' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci
git bisect good f414f9fd68797182f8de4e1cd9855b6b28abde99
# good: [41dacb39fe79cd2fce42d31fa6658d926489a548] Merge tag
'drm-xe-fixes-2025-10-30' of
https://gitlab.freedesktop.org/drm/xe/kernel into drm-fixes
git bisect good 41dacb39fe79cd2fce42d31fa6658d926489a548
# bad: [f9bc8e0912b8f6b1d60608a715a1da575670e038] Merge tag
'perf-urgent-2025-11-01' of
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect bad f9bc8e0912b8f6b1d60608a715a1da575670e038
# good: [c44b4b9eeb71f5b0b617abf6fd66d1ef0aab6200] objtool: Fix
skip_alt_group() for non-alternative STAC/CLAC
git bisect good c44b4b9eeb71f5b0b617abf6fd66d1ef0aab6200
# bad: [cb7f9fc3725a11447a4af69dfe8d648e4320acdc] Merge tag
'kbuild-fixes-6.18-2' of
git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux
git bisect bad cb7f9fc3725a11447a4af69dfe8d648e4320acdc
# bad: [d50f21091358b2b29dc06c2061106cdb0f030d03] kbuild: align modinfo
section for Secureboot Authenticode EDK2 compat
git bisect bad d50f21091358b2b29dc06c2061106cdb0f030d03
# good: [5ff90d427ef841fa48608d0c19a81c48d6126d46] kbuild:
install-extmod-build: Fix when given dir outside the build dir
git bisect good 5ff90d427ef841fa48608d0c19a81c48d6126d46
# first bad commit: [d50f21091358b2b29dc06c2061106cdb0f030d03] kbuild:
align modinfo section for Secureboot Authenticode EDK2 compat
Please add below tag as well, if you happen to fix this.
Reported-by: Venkat Rao Bagalkote <[email protected]>
Regards,
Venkat.
If you happen to fix the above issue, then please add below tag.
Reported-by: Samir M <[email protected]>
Regards,
Samir.
