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kbuild: Strip trailing padding bytes from modules.builtin.modinfo

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After commit d50f210913 ("kbuild: align modinfo section for Secureboot
Authenticode EDK2 compat"), running modules_install with certain
versions of kmod (such as 29.1 in Ubuntu Jammy) in certain
configurations may fail with:

  depmod: ERROR: kmod_builtin_iter_next: unexpected string without modname prefix

The additional padding bytes to ensure .modinfo is aligned within
vmlinux.unstripped are unexpected by kmod, as this section has always
just been null-terminated strings.

Strip the trailing padding bytes from modules.builtin.modinfo after it
has been extracted from vmlinux.unstripped to restore the format that
kmod expects while keeping .modinfo aligned within vmlinux.unstripped to
avoid regressing the Authenticode calculation fix for EDK2.

Cc: stable@vger.kernel.org
Fixes: d50f210913 ("kbuild: align modinfo section for Secureboot Authenticode EDK2 compat")
Reported-by: Omar Sandoval <osandov@fb.com>
Reported-by: Samir M <samir@linux.ibm.com>
Reported-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Closes: https://lore.kernel.org/7fef7507-ad64-4e51-9bb8-c9fb6532e51e@linux.ibm.com/
Tested-by: Omar Sandoval <osandov@fb.com>
Tested-by: Samir M <samir@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Reviewed-by: Nicolas Schier <nsc@kernel.org>
Link: https://patch.msgid.link/20251105-kbuild-fix-builtin-modinfo-for-kmod-v1-1-b419d8ad4606@kernel.org
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
This commit is contained in:
Nathan Chancellor 2025-11-05 15:30:27 -07:00
parent 6146a0f1df
commit a26a6c93ed
No known key found for this signature in database
GPG key ID: 1D6B269171C01A96
1 changed files with 14 additions and 1 deletions
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15
scripts/Makefile.vmlinux
View file

@ -102,11 +102,24 @@ vmlinux: vmlinux.unstripped FORCE
# modules.builtin.modinfo
# ---------------------------------------------------------------------------
# .modinfo in vmlinux.unstripped is aligned to 8 bytes for compatibility with
# tools that expect vmlinux to have sufficiently aligned sections but the
# additional bytes used for padding .modinfo to satisfy this requirement break
# certain versions of kmod with
#
# depmod: ERROR: kmod_builtin_iter_next: unexpected string without modname prefix
#
# Strip the trailing padding bytes after extracting .modinfo to comply with
# what kmod expects to parse.
quiet_cmd_modules_builtin_modinfo = GEN $@
cmd_modules_builtin_modinfo = $(cmd_objcopy); \
sed -i 's/\x00\+$$/\x00/g' $@
OBJCOPYFLAGS_modules.builtin.modinfo := -j .modinfo -O binary
targets += modules.builtin.modinfo
modules.builtin.modinfo: vmlinux.unstripped FORCE
$(call if_changed,objcopy)
$(call if_changed,modules_builtin_modinfo)
# modules.builtin
# ---------------------------------------------------------------------------