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kbuild: Strip runtime const RELA sections correctly

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Due to the fact that runtime const ELF sections are named without a
leading period or double underscore, the RSTRIP logic that removes the
static RELA sections from vmlinux fails to identify them. This results
in a situation like below, where some sections that were supposed to get
removed are left behind.

  [Nr] Name                              Type            Address          Off     Size   ES Flg Lk Inf Al

  [58] runtime_shift_d_hash_shift        PROGBITS        ffffffff83500f50 2900f50 000014 00   A  0   0  1
  [59] .relaruntime_shift_d_hash_shift   RELA            0000000000000000 55b6f00 000078 18   I 70  58  8
  [60] runtime_ptr_dentry_hashtable      PROGBITS        ffffffff83500f68 2900f68 000014 00   A  0   0  1
  [61] .relaruntime_ptr_dentry_hashtable RELA            0000000000000000 55b6f78 000078 18   I 70  60  8
  [62] runtime_ptr_USER_PTR_MAX          PROGBITS        ffffffff83500f80 2900f80 000238 00   A  0   0  1
  [63] .relaruntime_ptr_USER_PTR_MAX     RELA            0000000000000000 55b6ff0 000d50 18   I 70  62  8

So tweak the match expression to strip all sections starting with .rel.
While at it, consolidate the logic used by RISC-V, s390 and x86 into a
single shared Makefile library command.

Link: https://lore.kernel.org/all/CAHk-=wjk3ynjomNvFN8jf9A1k=qSc=JFF591W00uXj-qqNUxPQ@mail.gmail.com/
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Tested-by: Charlie Jenkins <charlie@rivosinc.com>
Tested-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Ard Biesheuvel 2025-01-13 16:53:07 +01:00 committed by Masahiro Yamada
parent a409fc1463
commit 71d815bf5d
4 changed files with 7 additions and 16 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

8
arch/riscv/Makefile.postlink
View file

@ -10,6 +10,7 @@ __archpost:
-include include/config/auto.conf
include $(srctree)/scripts/Kbuild.include
include $(srctree)/scripts/Makefile.lib
quiet_cmd_relocs_check = CHKREL $@
cmd_relocs_check = \
@ -19,11 +20,6 @@ ifdef CONFIG_RELOCATABLE
quiet_cmd_cp_vmlinux_relocs = CPREL vmlinux.relocs
cmd_cp_vmlinux_relocs = cp vmlinux vmlinux.relocs
quiet_cmd_relocs_strip = STRIPREL $@
cmd_relocs_strip = $(OBJCOPY) --remove-section='.rel.*' \
--remove-section='.rel__*' \
--remove-section='.rela.*' \
--remove-section='.rela__*' $@
endif
# `@true` prevents complaint when there is nothing to be done
@ -33,7 +29,7 @@ vmlinux: FORCE
ifdef CONFIG_RELOCATABLE
$(call if_changed,relocs_check)
$(call if_changed,cp_vmlinux_relocs)
$(call if_changed,relocs_strip)
$(call if_changed,strip_relocs)
endif
clean:

6
arch/s390/Makefile.postlink
View file

@ -11,6 +11,7 @@ __archpost:
-include include/config/auto.conf
include $(srctree)/scripts/Kbuild.include
include $(srctree)/scripts/Makefile.lib
CMD_RELOCS=arch/s390/tools/relocs
OUT_RELOCS = arch/s390/boot
@ -19,11 +20,6 @@ quiet_cmd_relocs = RELOCS $(OUT_RELOCS)/relocs.S
mkdir -p $(OUT_RELOCS); \
$(CMD_RELOCS) $@ > $(OUT_RELOCS)/relocs.S
quiet_cmd_strip_relocs = RSTRIP $@
cmd_strip_relocs = \
$(OBJCOPY) --remove-section='.rel.*' --remove-section='.rel__*' \
--remove-section='.rela.*' --remove-section='.rela__*' $@
vmlinux: FORCE
$(call cmd,relocs)
$(call cmd,strip_relocs)

6
arch/x86/Makefile.postlink
View file

@ -11,6 +11,7 @@ __archpost:
-include include/config/auto.conf
include $(srctree)/scripts/Kbuild.include
include $(srctree)/scripts/Makefile.lib
CMD_RELOCS = arch/x86/tools/relocs
OUT_RELOCS = arch/x86/boot/compressed
@ -20,11 +21,6 @@ quiet_cmd_relocs = RELOCS $(OUT_RELOCS)/$@.relocs
$(CMD_RELOCS) $@ > $(OUT_RELOCS)/$@.relocs; \
$(CMD_RELOCS) --abs-relocs $@
quiet_cmd_strip_relocs = RSTRIP $@
cmd_strip_relocs = \
$(OBJCOPY) --remove-section='.rel.*' --remove-section='.rel__*' \
--remove-section='.rela.*' --remove-section='.rela__*' $@
# `@true` prevents complaint when there is nothing to be done
vmlinux: FORCE

3
scripts/Makefile.lib
View file

@ -374,6 +374,9 @@ quiet_cmd_ar = AR $@
quiet_cmd_objcopy = OBJCOPY $@
cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
quiet_cmd_strip_relocs = RSTRIP $@
cmd_strip_relocs = $(OBJCOPY) --remove-section='.rel*' $@
# Gzip
# ---------------------------------------------------------------------------