From: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> Create cmd_klp_convert and hook it into scripts/Makefile.modpost. cmd_klp_convert invokes klp-convert with the right arguments for the conversion of unresolved symbols inside a livepatch. Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx> Signed-off-by: Miroslav Benes <mbenes@xxxxxxx> Signed-off-by: Joao Moreira <jmoreira@xxxxxxx> Signed-off-by: Joe Lawrence <joe.lawrence@xxxxxxxxxx> --- scripts/Kbuild.include | 4 +++- scripts/Makefile.modpost | 16 +++++++++++++++- scripts/mod/modpost.c | 6 +++++- scripts/mod/modpost.h | 1 + 4 files changed, 24 insertions(+), 3 deletions(-) diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include index 7484b9d8272f..f8b7d12e44c9 100644 --- a/scripts/Kbuild.include +++ b/scripts/Kbuild.include @@ -236,6 +236,8 @@ endif # (needed for the shell) make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1))))) +save-cmd = printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd + # Find any prerequisites that is newer than target or that does not exist. # PHONY targets skipped in both cases. any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) @@ -243,7 +245,7 @@ any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) # Execute command if command has changed or prerequisite(s) are updated. if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ $(cmd); \ - printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:) + $(save-cmd), @:) # Execute the command and also postprocess generated .d dependencies file. if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)),$(cmd_and_fixdep),@:) diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost index 6b7f354f189a..1e8bb7442689 100644 --- a/scripts/Makefile.modpost +++ b/scripts/Makefile.modpost @@ -124,8 +124,22 @@ quiet_cmd_ld_ko_o = LD [M] $@ -o $@ $(real-prereqs) ; \ $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) +SLIST = $(objtree)/Symbols.list +KLP_CONVERT = scripts/livepatch/klp-convert +quiet_cmd_klp_convert = KLP $@ + cmd_klp_convert = mv $@ $(@:.ko=.klp.o); \ + $(KLP_CONVERT) $(SLIST) $(@:.ko=.klp.o) $@ + +define rule_ld_ko_o + $(call echo-cmd,ld_ko_o) $(cmd_ld_ko_o) ; \ + $(call save-cmd,ld_ko_o) ; \ + $(if $(CONFIG_LIVEPATCH), \ + $(if $(wildcard $(MODVERDIR)/$(basetarget).livepatch), \ + $(call echo-cmd,klp_convert) $(cmd_klp_convert) )) +endef + $(modules): %.ko :%.o %.mod.o FORCE - +$(call if_changed,ld_ko_o) + +$(call if_changed_rule,ld_ko_o) targets += $(modules) diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index f277e116e0eb..374b22c76ec5 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -1974,6 +1974,10 @@ static void read_symbols(const char *modname) license = get_next_modinfo(&info, "license", license); } + /* Livepatch modules have unresolved symbols resolved by klp-convert */ + if (get_modinfo(&info, "livepatch")) + mod->livepatch = 1; + for (sym = info.symtab_start; sym < info.symtab_stop; sym++) { symname = remove_dot(info.strtab + sym->st_name); @@ -2101,7 +2105,7 @@ static int check_exports(struct module *mod) const char *basename; exp = find_symbol(s->name); if (!exp || exp->module == mod) { - if (have_vmlinux && !s->weak) { + if (have_vmlinux && !s->weak && !mod->livepatch) { if (warn_unresolved) { warn("\"%s\" [%s.ko] undefined!\n", s->name, mod->name); diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h index 8453d6ac2f77..2acfaae064ec 100644 --- a/scripts/mod/modpost.h +++ b/scripts/mod/modpost.h @@ -118,6 +118,7 @@ struct module { int skip; int has_init; int has_cleanup; + int livepatch; struct buffer dev_table_buf; char srcversion[25]; int is_dot_o; -- 2.20.1