From 2daf7faba7ded8703e4b4ebc8b161f22272fc91a Mon Sep 17 00:00:00 2001
From: Josh Poimboeuf <jpoimboe@redhat.com>
Date: Mon, 18 Apr 2022 09:50:26 -0700
Subject: objtool: Reorganize cmdline options

Split the existing options into two groups: actions, which actually do
something; and options, which modify the actions in some way.

Also there's no need to have short flags for all the non-action options.
Reserve short flags for the more important actions.

While at it:

- change a few of the short flags to be more intuitive

- make option descriptions more consistently descriptive

- sort options in the source like they are when printed

- move options to a global struct

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/9dcaa752f83aca24b1b21f0b0eeb28a0c181c0b0.1650300597.git.jpoimboe@redhat.com
---
 scripts/Makefile.build | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

(limited to 'scripts/Makefile.build')

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 33c1ed581522..dd9d582808d6 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -228,14 +228,14 @@ objtool := $(objtree)/tools/objtool/objtool
 
 objtool_args =								\
 	$(if $(CONFIG_UNWINDER_ORC),orc generate,check)			\
-	$(if $(part-of-module), --module)				\
 	$(if $(CONFIG_X86_KERNEL_IBT), --lto --ibt)			\
-	$(if $(CONFIG_FRAME_POINTER),, --no-fp)				\
-	$(if $(CONFIG_GCOV_KERNEL), --no-unreachable)			\
+	$(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount)		\
 	$(if $(CONFIG_RETPOLINE), --retpoline)				\
+	$(if $(CONFIG_SLS), --sls)					\
 	$(if $(CONFIG_X86_SMAP), --uaccess)				\
-	$(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount)		\
-	$(if $(CONFIG_SLS), --sls)
+	$(if $(part-of-module), --module)				\
+	$(if $(CONFIG_FRAME_POINTER),, --no-fp)				\
+	$(if $(CONFIG_GCOV_KERNEL), --no-unreachable)
 
 cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool_args) $@)
 cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd)
-- 
cgit v1.2.3-59-g8ed1b


From b51277eb9775ce916f9efd2c51533e481180c1e8 Mon Sep 17 00:00:00 2001
From: Josh Poimboeuf <jpoimboe@redhat.com>
Date: Mon, 18 Apr 2022 09:50:27 -0700
Subject: objtool: Ditch subcommands

Objtool has a fairly singular focus.  It runs on object files and does
validations and transformations which can be combined in various ways.
The subcommand model has never been a good fit, making it awkward to
combine and remove options.

Remove the "check" and "orc" subcommands in favor of a more traditional
cmdline option model.  This makes it much more flexible to use, and
easier to port individual features to other arches.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/5c61ebf805e90aefc5fa62bc63468ffae53b9df6.1650300597.git.jpoimboe@redhat.com
---
 scripts/Makefile.build                  |  2 +-
 scripts/link-vmlinux.sh                 | 13 ++---
 tools/objtool/Build                     | 12 ++--
 tools/objtool/Makefile                  |  8 +--
 tools/objtool/builtin-check.c           | 56 +++++++++++++++----
 tools/objtool/builtin-orc.c             | 73 -------------------------
 tools/objtool/check.c                   |  8 +++
 tools/objtool/include/objtool/builtin.h |  5 +-
 tools/objtool/objtool.c                 | 97 +--------------------------------
 tools/objtool/weak.c                    |  9 +--
 10 files changed, 72 insertions(+), 211 deletions(-)
 delete mode 100644 tools/objtool/builtin-orc.c

(limited to 'scripts/Makefile.build')

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index dd9d582808d6..116c7272b41c 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -227,9 +227,9 @@ ifdef CONFIG_STACK_VALIDATION
 objtool := $(objtree)/tools/objtool/objtool
 
 objtool_args =								\
-	$(if $(CONFIG_UNWINDER_ORC),orc generate,check)			\
 	$(if $(CONFIG_X86_KERNEL_IBT), --lto --ibt)			\
 	$(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount)		\
+	$(if $(CONFIG_UNWINDER_ORC), --orc)				\
 	$(if $(CONFIG_RETPOLINE), --retpoline)				\
 	$(if $(CONFIG_SLS), --sls)					\
 	$(if $(CONFIG_X86_SMAP), --uaccess)				\
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index c6e9fef61b11..f6db79b11573 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -113,9 +113,6 @@ objtool_link()
 
 		# Don't perform vmlinux validation unless explicitly requested,
 		# but run objtool on vmlinux.o now that we have an object file.
-		if is_enabled CONFIG_UNWINDER_ORC; then
-			objtoolcmd="orc generate"
-		fi
 
 		if is_enabled CONFIG_X86_KERNEL_IBT; then
 			objtoolopt="${objtoolopt} --ibt"
@@ -125,6 +122,10 @@ objtool_link()
 			objtoolopt="${objtoolopt} --mcount"
 		fi
 
+		if is_enabled CONFIG_UNWINDER_ORC; then
+			objtoolopt="${objtoolopt} --orc"
+		fi
+
 		objtoolopt="${objtoolopt} --lto"
 	fi
 
@@ -134,10 +135,6 @@ objtool_link()
 
 	if [ -n "${objtoolopt}" ]; then
 
-		if [ -z "${objtoolcmd}" ]; then
-			objtoolcmd="check"
-		fi
-
 		if is_enabled CONFIG_RETPOLINE; then
 			objtoolopt="${objtoolopt} --retpoline"
 		fi
@@ -161,7 +158,7 @@ objtool_link()
 		objtoolopt="${objtoolopt} --vmlinux"
 
 		info OBJTOOL ${1}
-		tools/objtool/objtool ${objtoolcmd} ${objtoolopt} ${1}
+		tools/objtool/objtool ${objtoolopt} ${1}
 	fi
 }
 
diff --git a/tools/objtool/Build b/tools/objtool/Build
index b7222d5cc7bc..33f2ee5a46d3 100644
--- a/tools/objtool/Build
+++ b/tools/objtool/Build
@@ -2,17 +2,15 @@ objtool-y += arch/$(SRCARCH)/
 
 objtool-y += weak.o
 
-objtool-$(SUBCMD_CHECK) += check.o
-objtool-$(SUBCMD_CHECK) += special.o
-objtool-$(SUBCMD_ORC) += check.o
-objtool-$(SUBCMD_ORC) += orc_gen.o
-objtool-$(SUBCMD_ORC) += orc_dump.o
-
+objtool-y += check.o
+objtool-y += special.o
 objtool-y += builtin-check.o
-objtool-y += builtin-orc.o
 objtool-y += elf.o
 objtool-y += objtool.o
 
+objtool-$(BUILD_ORC) += orc_gen.o
+objtool-$(BUILD_ORC) += orc_dump.o
+
 objtool-y += libstring.o
 objtool-y += libctype.o
 objtool-y += str_error_r.o
diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index 0dbd397f319d..061cf1cd42c4 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -39,15 +39,13 @@ CFLAGS += $(if $(elfshdr),,-DLIBELF_USE_DEPRECATED)
 
 AWK = awk
 
-SUBCMD_CHECK := n
-SUBCMD_ORC := n
+BUILD_ORC := n
 
 ifeq ($(SRCARCH),x86)
-	SUBCMD_CHECK := y
-	SUBCMD_ORC := y
+	BUILD_ORC := y
 endif
 
-export SUBCMD_CHECK SUBCMD_ORC
+export BUILD_ORC
 export srctree OUTPUT CFLAGS SRCARCH AWK
 include $(srctree)/tools/build/Makefile.include
 
diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
index bc447b3cd9f2..8c3eed5b67e4 100644
--- a/tools/objtool/builtin-check.c
+++ b/tools/objtool/builtin-check.c
@@ -3,16 +3,6 @@
  * Copyright (C) 2015-2017 Josh Poimboeuf <jpoimboe@redhat.com>
  */
 
-/*
- * objtool check:
- *
- * This command analyzes every .o file and ensures the validity of its stack
- * trace metadata.  It enforces a set of rules on asm code and C inline
- * assembly code so that stack traces can be reliable.
- *
- * For more information, see tools/objtool/Documentation/stack-validation.txt.
- */
-
 #include <subcmd/parse-options.h>
 #include <string.h>
 #include <stdlib.h>
@@ -22,7 +12,7 @@
 struct opts opts;
 
 static const char * const check_usage[] = {
-	"objtool check <actions> [<options>] file.o",
+	"objtool <actions> [<options>] file.o",
 	NULL,
 };
 
@@ -31,14 +21,26 @@ static const char * const env_usage[] = {
 	NULL,
 };
 
+static int parse_dump(const struct option *opt, const char *str, int unset)
+{
+	if (!str || !strcmp(str, "orc")) {
+		opts.dump_orc = true;
+		return 0;
+	}
+
+	return -1;
+}
+
 const struct option check_options[] = {
 	OPT_GROUP("Actions:"),
 	OPT_BOOLEAN('i', "ibt", &opts.ibt, "validate and annotate IBT"),
 	OPT_BOOLEAN('m', "mcount", &opts.mcount, "annotate mcount/fentry calls for ftrace"),
 	OPT_BOOLEAN('n', "noinstr", &opts.noinstr, "validate noinstr rules"),
+	OPT_BOOLEAN('o', "orc", &opts.orc, "generate ORC metadata"),
 	OPT_BOOLEAN('r', "retpoline", &opts.retpoline, "validate and annotate retpoline usage"),
 	OPT_BOOLEAN('l', "sls", &opts.sls, "validate straight-line-speculation mitigations"),
 	OPT_BOOLEAN('u', "uaccess", &opts.uaccess, "validate uaccess rules for SMAP"),
+	OPT_CALLBACK_OPTARG(0, "dump", NULL, NULL, "orc", "dump metadata", parse_dump),
 
 	OPT_GROUP("Options:"),
 	OPT_BOOLEAN(0, "backtrace", &opts.backtrace, "unwind on error"),
@@ -81,7 +83,31 @@ int cmd_parse_options(int argc, const char **argv, const char * const usage[])
 	return argc;
 }
 
-int cmd_check(int argc, const char **argv)
+static bool opts_valid(void)
+{
+	if (opts.ibt		||
+	    opts.mcount		||
+	    opts.noinstr	||
+	    opts.orc		||
+	    opts.retpoline	||
+	    opts.sls		||
+	    opts.uaccess) {
+		if (opts.dump_orc) {
+			fprintf(stderr, "--dump can't be combined with other options\n");
+			return false;
+		}
+
+		return true;
+	}
+
+	if (opts.dump_orc)
+		return true;
+
+	fprintf(stderr, "At least one command required\n");
+	return false;
+}
+
+int objtool_run(int argc, const char **argv)
 {
 	const char *objname;
 	struct objtool_file *file;
@@ -90,6 +116,12 @@ int cmd_check(int argc, const char **argv)
 	argc = cmd_parse_options(argc, argv, check_usage);
 	objname = argv[0];
 
+	if (!opts_valid())
+		return 1;
+
+	if (opts.dump_orc)
+		return orc_dump(objname);
+
 	file = objtool_open_read(objname);
 	if (!file)
 		return 1;
diff --git a/tools/objtool/builtin-orc.c b/tools/objtool/builtin-orc.c
deleted file mode 100644
index 17f8b9307738..000000000000
--- a/tools/objtool/builtin-orc.c
+++ /dev/null
@@ -1,73 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
- */
-
-/*
- * objtool orc:
- *
- * This command analyzes a .o file and adds .orc_unwind and .orc_unwind_ip
- * sections to it, which is used by the in-kernel ORC unwinder.
- *
- * This command is a superset of "objtool check".
- */
-
-#include <string.h>
-#include <objtool/builtin.h>
-#include <objtool/objtool.h>
-
-static const char *orc_usage[] = {
-	"objtool orc generate [<options>] file.o",
-	"objtool orc dump file.o",
-	NULL,
-};
-
-int cmd_orc(int argc, const char **argv)
-{
-	const char *objname;
-
-	argc--; argv++;
-	if (argc <= 0)
-		usage_with_options(orc_usage, check_options);
-
-	if (!strncmp(argv[0], "gen", 3)) {
-		struct objtool_file *file;
-		int ret;
-
-		argc = cmd_parse_options(argc, argv, orc_usage);
-		objname = argv[0];
-
-		file = objtool_open_read(objname);
-		if (!file)
-			return 1;
-
-		ret = check(file);
-		if (ret)
-			return ret;
-
-		if (list_empty(&file->insn_list))
-			return 0;
-
-		ret = orc_create(file);
-		if (ret)
-			return ret;
-
-		if (!file->elf->changed)
-			return 0;
-
-		return elf_write(file->elf);
-	}
-
-	if (!strcmp(argv[0], "dump")) {
-		if (argc != 2)
-			usage_with_options(orc_usage, check_options);
-
-		objname = argv[1];
-
-		return orc_dump(objname);
-	}
-
-	usage_with_options(orc_usage, check_options);
-
-	return 0;
-}
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 3362cc3bdf1a..16a6c4b4f6bb 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -3949,6 +3949,14 @@ int check(struct objtool_file *file)
 		warnings += ret;
 	}
 
+	if (opts.orc && !list_empty(&file->insn_list)) {
+		ret = orc_create(file);
+		if (ret < 0)
+			goto out;
+		warnings += ret;
+	}
+
+
 	if (opts.stats) {
 		printf("nr_insns_visited: %ld\n", nr_insns_visited);
 		printf("nr_cfi: %ld\n", nr_cfi);
diff --git a/tools/objtool/include/objtool/builtin.h b/tools/objtool/include/objtool/builtin.h
index 87c1a7351e3c..44548e24473c 100644
--- a/tools/objtool/include/objtool/builtin.h
+++ b/tools/objtool/include/objtool/builtin.h
@@ -11,9 +11,11 @@ extern const struct option check_options[];
 
 struct opts {
 	/* actions: */
+	bool dump_orc;
 	bool ibt;
 	bool mcount;
 	bool noinstr;
+	bool orc;
 	bool retpoline;
 	bool sls;
 	bool uaccess;
@@ -34,7 +36,6 @@ extern struct opts opts;
 
 extern int cmd_parse_options(int argc, const char **argv, const char * const usage[]);
 
-extern int cmd_check(int argc, const char **argv);
-extern int cmd_orc(int argc, const char **argv);
+extern int objtool_run(int argc, const char **argv);
 
 #endif /* _BUILTIN_H */
diff --git a/tools/objtool/objtool.c b/tools/objtool/objtool.c
index a0f3d3c9558d..512669ce064c 100644
--- a/tools/objtool/objtool.c
+++ b/tools/objtool/objtool.c
@@ -3,16 +3,6 @@
  * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
  */
 
-/*
- * objtool:
- *
- * The 'check' subcmd analyzes every .o file and ensures the validity of its
- * stack trace metadata.  It enforces a set of rules on asm code and C inline
- * assembly code so that stack traces can be reliable.
- *
- * For more information, see tools/objtool/Documentation/stack-validation.txt.
- */
-
 #include <stdio.h>
 #include <stdbool.h>
 #include <string.h>
@@ -26,20 +16,6 @@
 #include <objtool/objtool.h>
 #include <objtool/warn.h>
 
-struct cmd_struct {
-	const char *name;
-	int (*fn)(int, const char **);
-	const char *help;
-};
-
-static const char objtool_usage_string[] =
-	"objtool COMMAND [ARGS]";
-
-static struct cmd_struct objtool_cmds[] = {
-	{"check",	cmd_check,	"Perform stack metadata validation on an object file" },
-	{"orc",		cmd_orc,	"Generate in-place ORC unwind tables for an object file" },
-};
-
 bool help;
 
 const char *objname;
@@ -161,70 +137,6 @@ void objtool_pv_add(struct objtool_file *f, int idx, struct symbol *func)
 	f->pv_ops[idx].clean = false;
 }
 
-static void cmd_usage(void)
-{
-	unsigned int i, longest = 0;
-
-	printf("\n usage: %s\n\n", objtool_usage_string);
-
-	for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) {
-		if (longest < strlen(objtool_cmds[i].name))
-			longest = strlen(objtool_cmds[i].name);
-	}
-
-	puts(" Commands:");
-	for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) {
-		printf("   %-*s   ", longest, objtool_cmds[i].name);
-		puts(objtool_cmds[i].help);
-	}
-
-	printf("\n");
-
-	if (!help)
-		exit(129);
-	exit(0);
-}
-
-static void handle_options(int *argc, const char ***argv)
-{
-	while (*argc > 0) {
-		const char *cmd = (*argv)[0];
-
-		if (cmd[0] != '-')
-			break;
-
-		if (!strcmp(cmd, "--help") || !strcmp(cmd, "-h")) {
-			help = true;
-			break;
-		} else {
-			fprintf(stderr, "Unknown option: %s\n", cmd);
-			cmd_usage();
-		}
-
-		(*argv)++;
-		(*argc)--;
-	}
-}
-
-static void handle_internal_command(int argc, const char **argv)
-{
-	const char *cmd = argv[0];
-	unsigned int i, ret;
-
-	for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) {
-		struct cmd_struct *p = objtool_cmds+i;
-
-		if (strcmp(p->name, cmd))
-			continue;
-
-		ret = p->fn(argc, argv);
-
-		exit(ret);
-	}
-
-	cmd_usage();
-}
-
 int main(int argc, const char **argv)
 {
 	static const char *UNUSED = "OBJTOOL_NOT_IMPLEMENTED";
@@ -233,14 +145,7 @@ int main(int argc, const char **argv)
 	exec_cmd_init("objtool", UNUSED, UNUSED, UNUSED);
 	pager_init(UNUSED);
 
-	argv++;
-	argc--;
-	handle_options(&argc, &argv);
-
-	if (!argc || help)
-		cmd_usage();
-
-	handle_internal_command(argc, argv);
+	objtool_run(argc, argv);
 
 	return 0;
 }
diff --git a/tools/objtool/weak.c b/tools/objtool/weak.c
index 8314e824db4a..d83f607733b0 100644
--- a/tools/objtool/weak.c
+++ b/tools/objtool/weak.c
@@ -15,17 +15,12 @@
 	return ENOSYS;							\
 })
 
-int __weak check(struct objtool_file *file)
-{
-	UNSUPPORTED("check subcommand");
-}
-
 int __weak orc_dump(const char *_objname)
 {
-	UNSUPPORTED("orc");
+	UNSUPPORTED("ORC");
 }
 
 int __weak orc_create(struct objtool_file *file)
 {
-	UNSUPPORTED("orc");
+	UNSUPPORTED("ORC");
 }
-- 
cgit v1.2.3-59-g8ed1b


From 7dce62041ac34b613a5ed1bd937117e492e06dc8 Mon Sep 17 00:00:00 2001
From: Josh Poimboeuf <jpoimboe@redhat.com>
Date: Mon, 18 Apr 2022 09:50:33 -0700
Subject: objtool: Make stack validation optional

Make stack validation an explicit cmdline option so that individual
objtool features can be enabled individually by other arches.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/52da143699574d756e65ca4c9d4acaffe9b0fe5f.1650300597.git.jpoimboe@redhat.com
---
 scripts/Makefile.build                  |  1 +
 scripts/link-vmlinux.sh                 |  4 ++++
 tools/objtool/builtin-check.c           |  2 ++
 tools/objtool/check.c                   | 28 +++++++++++++++-------------
 tools/objtool/include/objtool/builtin.h |  1 +
 5 files changed, 23 insertions(+), 13 deletions(-)

(limited to 'scripts/Makefile.build')

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 116c7272b41c..d5e15ae29156 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -232,6 +232,7 @@ objtool_args =								\
 	$(if $(CONFIG_UNWINDER_ORC), --orc)				\
 	$(if $(CONFIG_RETPOLINE), --retpoline)				\
 	$(if $(CONFIG_SLS), --sls)					\
+	$(if $(CONFIG_STACK_VALIDATION), --stackval)			\
 	$(if $(CONFIG_X86_SMAP), --uaccess)				\
 	$(if $(part-of-module), --module)				\
 	$(if $(CONFIG_FRAME_POINTER),, --no-fp)				\
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index f6db79b11573..0140bfa32c0c 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -126,6 +126,10 @@ objtool_link()
 			objtoolopt="${objtoolopt} --orc"
 		fi
 
+		if is_enabled CONFIG_STACK_VALIDATION; then
+			objtoolopt="${objtoolopt} --stackval"
+		fi
+
 		objtoolopt="${objtoolopt} --lto"
 	fi
 
diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
index 6acfebd2c6ca..d4e6930ad0a0 100644
--- a/tools/objtool/builtin-check.c
+++ b/tools/objtool/builtin-check.c
@@ -39,6 +39,7 @@ const struct option check_options[] = {
 	OPT_BOOLEAN('o', "orc", &opts.orc, "generate ORC metadata"),
 	OPT_BOOLEAN('r', "retpoline", &opts.retpoline, "validate and annotate retpoline usage"),
 	OPT_BOOLEAN('l', "sls", &opts.sls, "validate straight-line-speculation mitigations"),
+	OPT_BOOLEAN('s', "stackval", &opts.stackval, "validate stack unwinding rules"),
 	OPT_BOOLEAN('u', "uaccess", &opts.uaccess, "validate uaccess rules for SMAP"),
 	OPT_CALLBACK_OPTARG(0, "dump", NULL, NULL, "orc", "dump metadata", parse_dump),
 
@@ -92,6 +93,7 @@ static bool opts_valid(void)
 	    opts.orc		||
 	    opts.retpoline	||
 	    opts.sls		||
+	    opts.stackval	||
 	    opts.uaccess) {
 		if (opts.dump_orc) {
 			fprintf(stderr, "--dump can't be combined with other options\n");
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 16a6c4b4f6bb..3456eb99b06e 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -3899,25 +3899,27 @@ int check(struct objtool_file *file)
 		warnings += ret;
 	}
 
-	ret = validate_functions(file);
-	if (ret < 0)
-		goto out;
-	warnings += ret;
-
-	ret = validate_unwind_hints(file, NULL);
-	if (ret < 0)
-		goto out;
-	warnings += ret;
+	if (opts.stackval || opts.orc || opts.uaccess || opts.ibt || opts.sls) {
+		ret = validate_functions(file);
+		if (ret < 0)
+			goto out;
+		warnings += ret;
 
-	if (opts.ibt) {
-		ret = validate_ibt(file);
+		ret = validate_unwind_hints(file, NULL);
 		if (ret < 0)
 			goto out;
 		warnings += ret;
+
+		if (!warnings) {
+			ret = validate_reachable_instructions(file);
+			if (ret < 0)
+				goto out;
+			warnings += ret;
+		}
 	}
 
-	if (!warnings) {
-		ret = validate_reachable_instructions(file);
+	if (opts.ibt) {
+		ret = validate_ibt(file);
 		if (ret < 0)
 			goto out;
 		warnings += ret;
diff --git a/tools/objtool/include/objtool/builtin.h b/tools/objtool/include/objtool/builtin.h
index e0972fbfa09e..8618585bb742 100644
--- a/tools/objtool/include/objtool/builtin.h
+++ b/tools/objtool/include/objtool/builtin.h
@@ -18,6 +18,7 @@ struct opts {
 	bool orc;
 	bool retpoline;
 	bool sls;
+	bool stackval;
 	bool uaccess;
 
 	/* options: */
-- 
cgit v1.2.3-59-g8ed1b


From 03f16cd020eb8bb2eb837e2090086f296a9fa91d Mon Sep 17 00:00:00 2001
From: Josh Poimboeuf <jpoimboe@redhat.com>
Date: Mon, 18 Apr 2022 09:50:36 -0700
Subject: objtool: Add CONFIG_OBJTOOL

Now that stack validation is an optional feature of objtool, add
CONFIG_OBJTOOL and replace most usages of CONFIG_STACK_VALIDATION with
it.

CONFIG_STACK_VALIDATION can now be considered to be frame-pointer
specific.  CONFIG_UNWINDER_ORC is already inherently valid for live
patching, so no need to "validate" it.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/939bf3d85604b2a126412bf11af6e3bd3b872bcb.1650300597.git.jpoimboe@redhat.com
---
 Makefile                          |  2 +-
 arch/Kconfig                      |  8 ++++++--
 arch/x86/Kconfig                  | 18 +++++++++++-------
 arch/x86/Kconfig.debug            |  2 +-
 arch/x86/include/asm/jump_label.h |  6 +++---
 arch/x86/kernel/alternative.c     |  6 +++---
 include/linux/compiler.h          |  6 +++---
 include/linux/instrumentation.h   |  6 +++---
 include/linux/objtool.h           |  6 +++---
 kernel/trace/Kconfig              |  1 +
 lib/Kconfig.debug                 | 20 +++++++++++---------
 lib/Kconfig.kcsan                 |  3 ++-
 lib/Kconfig.ubsan                 |  2 +-
 scripts/Makefile.build            |  4 ++--
 scripts/link-vmlinux.sh           | 32 ++++++++++++++++++--------------
 scripts/package/builddeb          |  2 +-
 tools/include/linux/objtool.h     |  6 +++---
 17 files changed, 73 insertions(+), 57 deletions(-)

(limited to 'scripts/Makefile.build')

diff --git a/Makefile b/Makefile
index fa5112a0ec1b..250707647359 100644
--- a/Makefile
+++ b/Makefile
@@ -1302,7 +1302,7 @@ install: sub_make_done :=
 # ---------------------------------------------------------------------------
 # Tools
 
-ifdef CONFIG_STACK_VALIDATION
+ifdef CONFIG_OBJTOOL
 prepare: tools/objtool
 endif
 
diff --git a/arch/Kconfig b/arch/Kconfig
index 29b0167c088b..04cdef16db24 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1028,11 +1028,14 @@ config ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
 	depends on MMU
 	select ARCH_HAS_ELF_RANDOMIZE
 
+config HAVE_OBJTOOL
+	bool
+
 config HAVE_STACK_VALIDATION
 	bool
 	help
-	  Architecture supports the 'objtool check' host tool command, which
-	  performs compile-time stack metadata validation.
+	  Architecture supports objtool compile-time frame pointer rule
+	  validation.
 
 config HAVE_RELIABLE_STACKTRACE
 	bool
@@ -1302,6 +1305,7 @@ config HAVE_STATIC_CALL
 config HAVE_STATIC_CALL_INLINE
 	bool
 	depends on HAVE_STATIC_CALL
+	select OBJTOOL
 
 config HAVE_PREEMPT_DYNAMIC
 	bool
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 4bed3abf444d..43e26ee1611e 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -188,7 +188,7 @@ config X86
 	select HAVE_CONTEXT_TRACKING		if X86_64
 	select HAVE_CONTEXT_TRACKING_OFFSTACK	if HAVE_CONTEXT_TRACKING
 	select HAVE_C_RECORDMCOUNT
-	select HAVE_OBJTOOL_MCOUNT		if STACK_VALIDATION
+	select HAVE_OBJTOOL_MCOUNT		if HAVE_OBJTOOL
 	select HAVE_BUILDTIME_MCOUNT_SORT
 	select HAVE_DEBUG_KMEMLEAK
 	select HAVE_DMA_CONTIGUOUS
@@ -231,6 +231,7 @@ config X86
 	select HAVE_MOVE_PMD
 	select HAVE_MOVE_PUD
 	select HAVE_NMI
+	select HAVE_OBJTOOL			if X86_64
 	select HAVE_OPTPROBES
 	select HAVE_PCSPKR_PLATFORM
 	select HAVE_PERF_EVENTS
@@ -239,17 +240,17 @@ config X86
 	select HAVE_PCI
 	select HAVE_PERF_REGS
 	select HAVE_PERF_USER_STACK_DUMP
-	select MMU_GATHER_RCU_TABLE_FREE		if PARAVIRT
+	select MMU_GATHER_RCU_TABLE_FREE	if PARAVIRT
 	select HAVE_POSIX_CPU_TIMERS_TASK_WORK
 	select HAVE_REGS_AND_STACK_ACCESS_API
-	select HAVE_RELIABLE_STACKTRACE		if X86_64 && (UNWINDER_FRAME_POINTER || UNWINDER_ORC) && STACK_VALIDATION
+	select HAVE_RELIABLE_STACKTRACE		if UNWINDER_ORC || STACK_VALIDATION
 	select HAVE_FUNCTION_ARG_ACCESS_API
 	select HAVE_SETUP_PER_CPU_AREA
 	select HAVE_SOFTIRQ_ON_OWN_STACK
 	select HAVE_STACKPROTECTOR		if CC_HAS_SANE_STACKPROTECTOR
-	select HAVE_STACK_VALIDATION		if X86_64
+	select HAVE_STACK_VALIDATION		if HAVE_OBJTOOL
 	select HAVE_STATIC_CALL
-	select HAVE_STATIC_CALL_INLINE		if HAVE_STACK_VALIDATION
+	select HAVE_STATIC_CALL_INLINE		if HAVE_OBJTOOL
 	select HAVE_PREEMPT_DYNAMIC_CALL
 	select HAVE_RSEQ
 	select HAVE_SYSCALL_TRACEPOINTS
@@ -268,7 +269,6 @@ config X86
 	select RTC_MC146818_LIB
 	select SPARSE_IRQ
 	select SRCU
-	select STACK_VALIDATION			if HAVE_STACK_VALIDATION && (HAVE_STATIC_CALL_INLINE || RETPOLINE)
 	select SYSCTL_EXCEPTION_TRACE
 	select THREAD_INFO_IN_TASK
 	select TRACE_IRQFLAGS_SUPPORT
@@ -459,6 +459,7 @@ config GOLDFISH
 
 config RETPOLINE
 	bool "Avoid speculative indirect branches in kernel"
+	select OBJTOOL if HAVE_OBJTOOL
 	default y
 	help
 	  Compile kernel with the retpoline compiler options to guard against
@@ -472,6 +473,7 @@ config CC_HAS_SLS
 config SLS
 	bool "Mitigate Straight-Line-Speculation"
 	depends on CC_HAS_SLS && X86_64
+	select OBJTOOL if HAVE_OBJTOOL
 	default n
 	help
 	  Compile the kernel with straight-line-speculation options to guard
@@ -1819,6 +1821,7 @@ config ARCH_RANDOM
 config X86_SMAP
 	def_bool y
 	prompt "Supervisor Mode Access Prevention" if EXPERT
+	select OBJTOOL if HAVE_OBJTOOL
 	help
 	  Supervisor Mode Access Prevention (SMAP) is a security
 	  feature in newer Intel processors.  There is a small
@@ -1855,9 +1858,10 @@ config CC_HAS_IBT
 config X86_KERNEL_IBT
 	prompt "Indirect Branch Tracking"
 	bool
-	depends on X86_64 && CC_HAS_IBT && STACK_VALIDATION
+	depends on X86_64 && CC_HAS_IBT && HAVE_OBJTOOL
 	# https://github.com/llvm/llvm-project/commit/9d7001eba9c4cb311e03cd8cdc231f9e579f2d0f
 	depends on !LD_IS_LLD || LLD_VERSION >= 140000
+	select OBJTOOL
 	help
 	  Build the kernel with support for Indirect Branch Tracking, a
 	  hardware support course-grain forward-edge Control Flow Integrity
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index d3a6f74a94bd..d872a7522e55 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -237,7 +237,7 @@ choice
 config UNWINDER_ORC
 	bool "ORC unwinder"
 	depends on X86_64
-	select STACK_VALIDATION
+	select OBJTOOL
 	help
 	  This option enables the ORC (Oops Rewind Capability) unwinder for
 	  unwinding kernel stack traces.  It uses a custom data format which is
diff --git a/arch/x86/include/asm/jump_label.h b/arch/x86/include/asm/jump_label.h
index 0449b125d27f..3ce0e67c579c 100644
--- a/arch/x86/include/asm/jump_label.h
+++ b/arch/x86/include/asm/jump_label.h
@@ -20,7 +20,7 @@
 	_ASM_PTR "%c0 + %c1 - .\n\t"			\
 	".popsection \n\t"
 
-#ifdef CONFIG_STACK_VALIDATION
+#ifdef CONFIG_OBJTOOL
 
 static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
 {
@@ -34,7 +34,7 @@ l_yes:
 	return true;
 }
 
-#else
+#else /* !CONFIG_OBJTOOL */
 
 static __always_inline bool arch_static_branch(struct static_key * const key, const bool branch)
 {
@@ -48,7 +48,7 @@ l_yes:
 	return true;
 }
 
-#endif /* STACK_VALIDATION */
+#endif /* CONFIG_OBJTOOL */
 
 static __always_inline bool arch_static_branch_jump(struct static_key * const key, const bool branch)
 {
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index d374cb3cf024..3c66073e7645 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -338,7 +338,7 @@ next:
 	}
 }
 
-#if defined(CONFIG_RETPOLINE) && defined(CONFIG_STACK_VALIDATION)
+#if defined(CONFIG_RETPOLINE) && defined(CONFIG_OBJTOOL)
 
 /*
  * CALL/JMP *%\reg
@@ -507,11 +507,11 @@ void __init_or_module noinline apply_retpolines(s32 *start, s32 *end)
 	}
 }
 
-#else /* !RETPOLINES || !CONFIG_STACK_VALIDATION */
+#else /* !CONFIG_RETPOLINE || !CONFIG_OBJTOOL */
 
 void __init_or_module noinline apply_retpolines(s32 *start, s32 *end) { }
 
-#endif /* CONFIG_RETPOLINE && CONFIG_STACK_VALIDATION */
+#endif /* CONFIG_RETPOLINE && CONFIG_OBJTOOL */
 
 #ifdef CONFIG_X86_KERNEL_IBT
 
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 219aa5ddbc73..01ce94b58b42 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -109,7 +109,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
 #endif
 
 /* Unreachable code */
-#ifdef CONFIG_STACK_VALIDATION
+#ifdef CONFIG_OBJTOOL
 /*
  * These macros help objtool understand GCC code flow for unreachable code.
  * The __COUNTER__ based labels are a hack to make each instance of the macros
@@ -128,10 +128,10 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
 /* Annotate a C jump table to allow objtool to follow the code flow */
 #define __annotate_jump_table __section(".rodata..c_jump_table")
 
-#else
+#else /* !CONFIG_OBJTOOL */
 #define annotate_unreachable()
 #define __annotate_jump_table
-#endif
+#endif /* CONFIG_OBJTOOL */
 
 #ifndef unreachable
 # define unreachable() do {		\
diff --git a/include/linux/instrumentation.h b/include/linux/instrumentation.h
index 24359b4a9605..9111a3704072 100644
--- a/include/linux/instrumentation.h
+++ b/include/linux/instrumentation.h
@@ -2,7 +2,7 @@
 #ifndef __LINUX_INSTRUMENTATION_H
 #define __LINUX_INSTRUMENTATION_H
 
-#if defined(CONFIG_DEBUG_ENTRY) && defined(CONFIG_STACK_VALIDATION)
+#ifdef CONFIG_VMLINUX_VALIDATION
 
 #include <linux/stringify.h>
 
@@ -53,9 +53,9 @@
 		     ".popsection\n\t" : : "i" (c));			\
 })
 #define instrumentation_end() __instrumentation_end(__COUNTER__)
-#else
+#else /* !CONFIG_VMLINUX_VALIDATION */
 # define instrumentation_begin()	do { } while(0)
 # define instrumentation_end()		do { } while(0)
-#endif
+#endif /* CONFIG_VMLINUX_VALIDATION */
 
 #endif /* __LINUX_INSTRUMENTATION_H */
diff --git a/include/linux/objtool.h b/include/linux/objtool.h
index 586d35720f13..977d90ba642d 100644
--- a/include/linux/objtool.h
+++ b/include/linux/objtool.h
@@ -38,7 +38,7 @@ struct unwind_hint {
 #define UNWIND_HINT_TYPE_REGS_PARTIAL	2
 #define UNWIND_HINT_TYPE_FUNC		3
 
-#ifdef CONFIG_STACK_VALIDATION
+#ifdef CONFIG_OBJTOOL
 
 #ifndef __ASSEMBLY__
 
@@ -157,7 +157,7 @@ struct unwind_hint {
 
 #endif /* __ASSEMBLY__ */
 
-#else /* !CONFIG_STACK_VALIDATION */
+#else /* !CONFIG_OBJTOOL */
 
 #ifndef __ASSEMBLY__
 
@@ -179,6 +179,6 @@ struct unwind_hint {
 .endm
 #endif
 
-#endif /* CONFIG_STACK_VALIDATION */
+#endif /* CONFIG_OBJTOOL */
 
 #endif /* _LINUX_OBJTOOL_H */
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 2c43e327a619..2956bc277150 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -728,6 +728,7 @@ config FTRACE_MCOUNT_USE_OBJTOOL
 	depends on !FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY
 	depends on !FTRACE_MCOUNT_USE_CC
 	depends on FTRACE_MCOUNT_RECORD
+	select OBJTOOL
 
 config FTRACE_MCOUNT_USE_RECORDMCOUNT
 	def_bool y
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 075cd25363ac..c0e4e47f3ce3 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -485,24 +485,25 @@ config FRAME_POINTER
 	  larger and slower, but it gives very useful debugging information
 	  in case of kernel bugs. (precise oopses/stacktraces/warnings)
 
+config OBJTOOL
+	bool
+
 config STACK_VALIDATION
 	bool "Compile-time stack metadata validation"
-	depends on HAVE_STACK_VALIDATION
+	depends on HAVE_STACK_VALIDATION && UNWINDER_FRAME_POINTER
+	select OBJTOOL
 	default n
 	help
-	  Add compile-time checks to validate stack metadata, including frame
-	  pointers (if CONFIG_FRAME_POINTER is enabled).  This helps ensure
-	  that runtime stack traces are more reliable.
-
-	  This is also a prerequisite for generation of ORC unwind data, which
-	  is needed for CONFIG_UNWINDER_ORC.
+	  Validate frame pointer rules at compile-time.  This helps ensure that
+	  runtime stack traces are more reliable.
 
 	  For more information, see
 	  tools/objtool/Documentation/stack-validation.txt.
 
 config VMLINUX_VALIDATION
 	bool
-	depends on STACK_VALIDATION && DEBUG_ENTRY
+	depends on HAVE_OBJTOOL && DEBUG_ENTRY
+	select OBJTOOL
 	default y
 
 config VMLINUX_MAP
@@ -2035,10 +2036,11 @@ config KCOV
 	bool "Code coverage for fuzzing"
 	depends on ARCH_HAS_KCOV
 	depends on CC_HAS_SANCOV_TRACE_PC || GCC_PLUGINS
-	depends on !ARCH_WANTS_NO_INSTR || STACK_VALIDATION || \
+	depends on !ARCH_WANTS_NO_INSTR || HAVE_OBJTOOL || \
 		   GCC_VERSION >= 120000 || CLANG_VERSION >= 130000
 	select DEBUG_FS
 	select GCC_PLUGIN_SANCOV if !CC_HAS_SANCOV_TRACE_PC
+	select OBJTOOL if HAVE_OBJTOOL
 	help
 	  KCOV exposes kernel code coverage information in a form suitable
 	  for coverage-guided fuzzing (randomized testing).
diff --git a/lib/Kconfig.kcsan b/lib/Kconfig.kcsan
index de022445fbba..901c3b509aca 100644
--- a/lib/Kconfig.kcsan
+++ b/lib/Kconfig.kcsan
@@ -187,7 +187,8 @@ config KCSAN_WEAK_MEMORY
 	# We can either let objtool nop __tsan_func_{entry,exit}() and builtin
 	# atomics instrumentation in .noinstr.text, or use a compiler that can
 	# implement __no_kcsan to really remove all instrumentation.
-	depends on STACK_VALIDATION || CC_IS_GCC || CLANG_VERSION >= 140000
+	depends on HAVE_OBJTOOL || CC_IS_GCC || CLANG_VERSION >= 140000
+	select OBJTOOL if HAVE_OBJTOOL
 	help
 	  Enable support for modeling a subset of weak memory, which allows
 	  detecting a subset of data races due to missing memory barriers.
diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
index f3c57ed51838..c4fe15d38b60 100644
--- a/lib/Kconfig.ubsan
+++ b/lib/Kconfig.ubsan
@@ -94,7 +94,7 @@ config UBSAN_UNREACHABLE
 	bool "Perform checking for unreachable code"
 	# objtool already handles unreachable checking and gets angry about
 	# seeing UBSan instrumentation located in unreachable places.
-	depends on !STACK_VALIDATION
+	depends on !(OBJTOOL && (STACK_VALIDATION || UNWINDER_ORC || X86_SMAP))
 	depends on $(cc-option,-fsanitize=unreachable)
 	help
 	  This option enables -fsanitize=unreachable which checks for control
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index d5e15ae29156..0f73e02b7cf1 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -222,7 +222,7 @@ cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)),
 	$(sub_cmd_record_mcount))
 endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
 
-ifdef CONFIG_STACK_VALIDATION
+ifdef CONFIG_OBJTOOL
 
 objtool := $(objtree)/tools/objtool/objtool
 
@@ -241,7 +241,7 @@ objtool_args =								\
 cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool_args) $@)
 cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd)
 
-endif # CONFIG_STACK_VALIDATION
+endif # CONFIG_OBJTOOL
 
 ifneq ($(CONFIG_LTO_CLANG)$(CONFIG_X86_KERNEL_IBT),)
 
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 0140bfa32c0c..5101a7fbfaaf 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -108,8 +108,11 @@ objtool_link()
 	local objtoolcmd;
 	local objtoolopt;
 
-	if is_enabled CONFIG_STACK_VALIDATION && \
-	   ( is_enabled CONFIG_LTO_CLANG || is_enabled CONFIG_X86_KERNEL_IBT ); then
+	if ! is_enabled CONFIG_OBJTOOL; then
+		return;
+	fi
+
+	if is_enabled CONFIG_LTO_CLANG || is_enabled CONFIG_X86_KERNEL_IBT; then
 
 		# Don't perform vmlinux validation unless explicitly requested,
 		# but run objtool on vmlinux.o now that we have an object file.
@@ -126,10 +129,23 @@ objtool_link()
 			objtoolopt="${objtoolopt} --orc"
 		fi
 
+		if is_enabled CONFIG_RETPOLINE; then
+			objtoolopt="${objtoolopt} --retpoline"
+		fi
+
+		if is_enabled CONFIG_SLS; then
+			objtoolopt="${objtoolopt} --sls"
+		fi
+
 		if is_enabled CONFIG_STACK_VALIDATION; then
 			objtoolopt="${objtoolopt} --stackval"
 		fi
 
+		if is_enabled CONFIG_X86_SMAP; then
+			objtoolopt="${objtoolopt} --uaccess"
+		fi
+
+
 		objtoolopt="${objtoolopt} --lto"
 	fi
 
@@ -139,18 +155,6 @@ objtool_link()
 
 	if [ -n "${objtoolopt}" ]; then
 
-		if is_enabled CONFIG_RETPOLINE; then
-			objtoolopt="${objtoolopt} --retpoline"
-		fi
-
-		if is_enabled CONFIG_SLS; then
-			objtoolopt="${objtoolopt} --sls"
-		fi
-
-		if is_enabled CONFIG_X86_SMAP; then
-			objtoolopt="${objtoolopt} --uaccess"
-		fi
-
 		if ! is_enabled CONFIG_FRAME_POINTER; then
 			objtoolopt="${objtoolopt} --no-fp"
 		fi
diff --git a/scripts/package/builddeb b/scripts/package/builddeb
index 91a502bb97e8..67cd420dcf89 100755
--- a/scripts/package/builddeb
+++ b/scripts/package/builddeb
@@ -67,7 +67,7 @@ deploy_kernel_headers () {
 	) > debian/hdrsrcfiles
 
 	{
-		if is_enabled CONFIG_STACK_VALIDATION; then
+		if is_enabled CONFIG_OBJTOOL; then
 			echo tools/objtool/objtool
 		fi
 
diff --git a/tools/include/linux/objtool.h b/tools/include/linux/objtool.h
index 586d35720f13..977d90ba642d 100644
--- a/tools/include/linux/objtool.h
+++ b/tools/include/linux/objtool.h
@@ -38,7 +38,7 @@ struct unwind_hint {
 #define UNWIND_HINT_TYPE_REGS_PARTIAL	2
 #define UNWIND_HINT_TYPE_FUNC		3
 
-#ifdef CONFIG_STACK_VALIDATION
+#ifdef CONFIG_OBJTOOL
 
 #ifndef __ASSEMBLY__
 
@@ -157,7 +157,7 @@ struct unwind_hint {
 
 #endif /* __ASSEMBLY__ */
 
-#else /* !CONFIG_STACK_VALIDATION */
+#else /* !CONFIG_OBJTOOL */
 
 #ifndef __ASSEMBLY__
 
@@ -179,6 +179,6 @@ struct unwind_hint {
 .endm
 #endif
 
-#endif /* CONFIG_STACK_VALIDATION */
+#endif /* CONFIG_OBJTOOL */
 
 #endif /* _LINUX_OBJTOOL_H */
-- 
cgit v1.2.3-59-g8ed1b


From 72064474964724c59ddff58a581a31b1ede75cf9 Mon Sep 17 00:00:00 2001
From: Josh Poimboeuf <jpoimboe@redhat.com>
Date: Mon, 18 Apr 2022 09:50:37 -0700
Subject: objtool: Make stack validation frame-pointer-specific

Now that CONFIG_STACK_VALIDATION is frame-pointer specific, do the same
for the '--stackval' option.  Now the '--no-fp' option is redundant and
can be removed.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/f563fa064b3b63d528de250c72012d49e14742a3.1650300597.git.jpoimboe@redhat.com
---
 scripts/Makefile.build                  | 1 -
 scripts/link-vmlinux.sh                 | 4 ----
 tools/objtool/builtin-check.c           | 3 +--
 tools/objtool/check.c                   | 4 ++--
 tools/objtool/include/objtool/builtin.h | 1 -
 5 files changed, 3 insertions(+), 10 deletions(-)

(limited to 'scripts/Makefile.build')

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 0f73e02b7cf1..6eb99cb08821 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -235,7 +235,6 @@ objtool_args =								\
 	$(if $(CONFIG_STACK_VALIDATION), --stackval)			\
 	$(if $(CONFIG_X86_SMAP), --uaccess)				\
 	$(if $(part-of-module), --module)				\
-	$(if $(CONFIG_FRAME_POINTER),, --no-fp)				\
 	$(if $(CONFIG_GCOV_KERNEL), --no-unreachable)
 
 cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool_args) $@)
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 5101a7fbfaaf..1be01163a9c5 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -155,10 +155,6 @@ objtool_link()
 
 	if [ -n "${objtoolopt}" ]; then
 
-		if ! is_enabled CONFIG_FRAME_POINTER; then
-			objtoolopt="${objtoolopt} --no-fp"
-		fi
-
 		if is_enabled CONFIG_GCOV_KERNEL; then
 			objtoolopt="${objtoolopt} --no-unreachable"
 		fi
diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
index d4e6930ad0a0..30971cc50c63 100644
--- a/tools/objtool/builtin-check.c
+++ b/tools/objtool/builtin-check.c
@@ -39,7 +39,7 @@ const struct option check_options[] = {
 	OPT_BOOLEAN('o', "orc", &opts.orc, "generate ORC metadata"),
 	OPT_BOOLEAN('r', "retpoline", &opts.retpoline, "validate and annotate retpoline usage"),
 	OPT_BOOLEAN('l', "sls", &opts.sls, "validate straight-line-speculation mitigations"),
-	OPT_BOOLEAN('s', "stackval", &opts.stackval, "validate stack unwinding rules"),
+	OPT_BOOLEAN('s', "stackval", &opts.stackval, "validate frame pointer rules"),
 	OPT_BOOLEAN('u', "uaccess", &opts.uaccess, "validate uaccess rules for SMAP"),
 	OPT_CALLBACK_OPTARG(0, "dump", NULL, NULL, "orc", "dump metadata", parse_dump),
 
@@ -49,7 +49,6 @@ const struct option check_options[] = {
 	OPT_BOOLEAN(0, "dry-run", &opts.dryrun, "don't write modifications"),
 	OPT_BOOLEAN(0, "lto", &opts.lto, "whole-archive like runs"),
 	OPT_BOOLEAN(0, "module", &opts.module, "object is part of a kernel module"),
-	OPT_BOOLEAN(0, "no-fp", &opts.no_fp, "skip frame pointer validation"),
 	OPT_BOOLEAN(0, "no-unreachable", &opts.no_unreachable, "skip 'unreachable instruction' warnings"),
 	OPT_BOOLEAN(0, "sec-address", &opts.sec_address, "print section addresses in warnings"),
 	OPT_BOOLEAN(0, "stats", &opts.stats, "print statistics"),
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 27126fff91dc..3e02126738a1 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2806,7 +2806,7 @@ static int update_cfi_state(struct instruction *insn,
 		}
 
 		/* detect when asm code uses rbp as a scratch register */
-		if (!opts.no_fp && insn->func && op->src.reg == CFI_BP &&
+		if (opts.stackval && insn->func && op->src.reg == CFI_BP &&
 		    cfa->base != CFI_BP)
 			cfi->bp_scratch = true;
 		break;
@@ -3279,7 +3279,7 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
 			if (ret)
 				return ret;
 
-			if (!opts.no_fp && func && !is_fentry_call(insn) &&
+			if (opts.stackval && func && !is_fentry_call(insn) &&
 			    !has_valid_stack_frame(&state)) {
 				WARN_FUNC("call without frame pointer save/setup",
 					  sec, insn->offset);
diff --git a/tools/objtool/include/objtool/builtin.h b/tools/objtool/include/objtool/builtin.h
index 8618585bb742..24a7ff4f37cc 100644
--- a/tools/objtool/include/objtool/builtin.h
+++ b/tools/objtool/include/objtool/builtin.h
@@ -27,7 +27,6 @@ struct opts {
 	bool dryrun;
 	bool lto;
 	bool module;
-	bool no_fp;
 	bool no_unreachable;
 	bool sec_address;
 	bool stats;
-- 
cgit v1.2.3-59-g8ed1b


From 26e176896a5bb9222ae3433da902edd2566a61a4 Mon Sep 17 00:00:00 2001
From: Josh Poimboeuf <jpoimboe@redhat.com>
Date: Mon, 18 Apr 2022 09:50:38 -0700
Subject: objtool: Make static call annotation optional

As part of making objtool more modular, put the existing static call
code behind a new '--static-call' option.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/d59ac57ef3d6d8380cdce20322314c9e2e556750.1650300597.git.jpoimboe@redhat.com
---
 scripts/Makefile.build                  |  1 +
 scripts/link-vmlinux.sh                 |  5 ++++-
 tools/objtool/builtin-check.c           |  2 ++
 tools/objtool/check.c                   | 10 ++++++----
 tools/objtool/include/objtool/builtin.h |  1 +
 5 files changed, 14 insertions(+), 5 deletions(-)

(limited to 'scripts/Makefile.build')

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 6eb99cb08821..3f20d565733c 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -233,6 +233,7 @@ objtool_args =								\
 	$(if $(CONFIG_RETPOLINE), --retpoline)				\
 	$(if $(CONFIG_SLS), --sls)					\
 	$(if $(CONFIG_STACK_VALIDATION), --stackval)			\
+	$(if $(CONFIG_HAVE_STATIC_CALL_INLINE), --static-call)		\
 	$(if $(CONFIG_X86_SMAP), --uaccess)				\
 	$(if $(part-of-module), --module)				\
 	$(if $(CONFIG_GCOV_KERNEL), --no-unreachable)
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 1be01163a9c5..33f14fe1ddde 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -141,11 +141,14 @@ objtool_link()
 			objtoolopt="${objtoolopt} --stackval"
 		fi
 
+		if is_enabled CONFIG_HAVE_STATIC_CALL_INLINE; then
+			objtoolopt="${objtoolopt} --static-call"
+		fi
+
 		if is_enabled CONFIG_X86_SMAP; then
 			objtoolopt="${objtoolopt} --uaccess"
 		fi
 
-
 		objtoolopt="${objtoolopt} --lto"
 	fi
 
diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
index 30971cc50c63..c8c4d2bab42f 100644
--- a/tools/objtool/builtin-check.c
+++ b/tools/objtool/builtin-check.c
@@ -40,6 +40,7 @@ const struct option check_options[] = {
 	OPT_BOOLEAN('r', "retpoline", &opts.retpoline, "validate and annotate retpoline usage"),
 	OPT_BOOLEAN('l', "sls", &opts.sls, "validate straight-line-speculation mitigations"),
 	OPT_BOOLEAN('s', "stackval", &opts.stackval, "validate frame pointer rules"),
+	OPT_BOOLEAN('t', "static-call", &opts.static_call, "annotate static calls"),
 	OPT_BOOLEAN('u', "uaccess", &opts.uaccess, "validate uaccess rules for SMAP"),
 	OPT_CALLBACK_OPTARG(0, "dump", NULL, NULL, "orc", "dump metadata", parse_dump),
 
@@ -93,6 +94,7 @@ static bool opts_valid(void)
 	    opts.retpoline	||
 	    opts.sls		||
 	    opts.stackval	||
+	    opts.static_call	||
 	    opts.uaccess) {
 		if (opts.dump_orc) {
 			fprintf(stderr, "--dump can't be combined with other options\n");
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 3e02126738a1..b9ac351ea08b 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -3969,10 +3969,12 @@ int check(struct objtool_file *file)
 		warnings += ret;
 	}
 
-	ret = create_static_call_sections(file);
-	if (ret < 0)
-		goto out;
-	warnings += ret;
+	if (opts.static_call) {
+		ret = create_static_call_sections(file);
+		if (ret < 0)
+			goto out;
+		warnings += ret;
+	}
 
 	if (opts.retpoline) {
 		ret = create_retpoline_sites_sections(file);
diff --git a/tools/objtool/include/objtool/builtin.h b/tools/objtool/include/objtool/builtin.h
index 24a7ff4f37cc..dc4757205b8d 100644
--- a/tools/objtool/include/objtool/builtin.h
+++ b/tools/objtool/include/objtool/builtin.h
@@ -19,6 +19,7 @@ struct opts {
 	bool retpoline;
 	bool sls;
 	bool stackval;
+	bool static_call;
 	bool uaccess;
 
 	/* options: */
-- 
cgit v1.2.3-59-g8ed1b


From 4ab7674f5951ac6a8ac4fa8828090edb64a4771f Mon Sep 17 00:00:00 2001
From: Josh Poimboeuf <jpoimboe@redhat.com>
Date: Mon, 18 Apr 2022 09:50:39 -0700
Subject: objtool: Make jump label hack optional

Objtool secretly does a jump label hack to overcome the limitations of
the toolchain.  Make the hack explicit (and optional for other arches)
by turning it into a cmdline option and kernel config option.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/3bdcbfdd27ecb01ddec13c04bdf756a583b13d24.1650300597.git.jpoimboe@redhat.com
---
 arch/Kconfig                            |  4 ++++
 arch/x86/Kconfig                        |  1 +
 arch/x86/include/asm/jump_label.h       |  6 +++---
 scripts/Makefile.build                  |  1 +
 scripts/link-vmlinux.sh                 |  4 ++++
 tools/objtool/builtin-check.c           | 37 ++++++++++++++++++++++++++-------
 tools/objtool/check.c                   |  2 +-
 tools/objtool/include/objtool/builtin.h |  1 +
 8 files changed, 44 insertions(+), 12 deletions(-)

(limited to 'scripts/Makefile.build')

diff --git a/arch/Kconfig b/arch/Kconfig
index 04cdef16db24..9dce6d6e3bc3 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -46,6 +46,7 @@ config JUMP_LABEL
 	bool "Optimize very unlikely/likely branches"
 	depends on HAVE_ARCH_JUMP_LABEL
 	depends on CC_HAS_ASM_GOTO
+	select OBJTOOL if HAVE_JUMP_LABEL_HACK
 	help
 	 This option enables a transparent branch optimization that
 	 makes certain almost-always-true or almost-always-false branch
@@ -1031,6 +1032,9 @@ config ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT
 config HAVE_OBJTOOL
 	bool
 
+config HAVE_JUMP_LABEL_HACK
+	bool
+
 config HAVE_STACK_VALIDATION
 	bool
 	help
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 43e26ee1611e..26d012f1eeb8 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -212,6 +212,7 @@ config X86
 	select HAVE_IOREMAP_PROT
 	select HAVE_IRQ_EXIT_ON_IRQ_STACK	if X86_64
 	select HAVE_IRQ_TIME_ACCOUNTING
+	select HAVE_JUMP_LABEL_HACK		if HAVE_OBJTOOL
 	select HAVE_KERNEL_BZIP2
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_LZ4
diff --git a/arch/x86/include/asm/jump_label.h b/arch/x86/include/asm/jump_label.h
index 3ce0e67c579c..071572e23d3a 100644
--- a/arch/x86/include/asm/jump_label.h
+++ b/arch/x86/include/asm/jump_label.h
@@ -20,7 +20,7 @@
 	_ASM_PTR "%c0 + %c1 - .\n\t"			\
 	".popsection \n\t"
 
-#ifdef CONFIG_OBJTOOL
+#ifdef CONFIG_HAVE_JUMP_LABEL_HACK
 
 static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
 {
@@ -34,7 +34,7 @@ l_yes:
 	return true;
 }
 
-#else /* !CONFIG_OBJTOOL */
+#else /* !CONFIG_HAVE_JUMP_LABEL_HACK */
 
 static __always_inline bool arch_static_branch(struct static_key * const key, const bool branch)
 {
@@ -48,7 +48,7 @@ l_yes:
 	return true;
 }
 
-#endif /* CONFIG_OBJTOOL */
+#endif /* CONFIG_HAVE_JUMP_LABEL_HACK */
 
 static __always_inline bool arch_static_branch_jump(struct static_key * const key, const bool branch)
 {
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 3f20d565733c..f1d2c2e4f15b 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -227,6 +227,7 @@ ifdef CONFIG_OBJTOOL
 objtool := $(objtree)/tools/objtool/objtool
 
 objtool_args =								\
+	$(if $(CONFIG_HAVE_JUMP_LABEL_HACK), --hacks=jump_label)	\
 	$(if $(CONFIG_X86_KERNEL_IBT), --lto --ibt)			\
 	$(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount)		\
 	$(if $(CONFIG_UNWINDER_ORC), --orc)				\
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 33f14fe1ddde..fa1f16840e76 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -117,6 +117,10 @@ objtool_link()
 		# Don't perform vmlinux validation unless explicitly requested,
 		# but run objtool on vmlinux.o now that we have an object file.
 
+		if is_enabled CONFIG_HAVE_JUMP_LABEL_HACK; then
+			objtoolopt="${objtoolopt} --hacks=jump_label"
+		fi
+
 		if is_enabled CONFIG_X86_KERNEL_IBT; then
 			objtoolopt="${objtoolopt} --ibt"
 		fi
diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
index c8c4d2bab42f..b2c626d9e2bf 100644
--- a/tools/objtool/builtin-check.c
+++ b/tools/objtool/builtin-check.c
@@ -31,8 +31,28 @@ static int parse_dump(const struct option *opt, const char *str, int unset)
 	return -1;
 }
 
+static int parse_hacks(const struct option *opt, const char *str, int unset)
+{
+	bool found = false;
+
+	/*
+	 * Use strstr() as a lazy method of checking for comma-separated
+	 * options.
+	 *
+	 * No string provided == enable all options.
+	 */
+
+	if (!str || strstr(str, "jump_label")) {
+		opts.hack_jump_label = true;
+		found = true;
+	}
+
+	return found ? 0 : -1;
+}
+
 const struct option check_options[] = {
 	OPT_GROUP("Actions:"),
+	OPT_CALLBACK_OPTARG('h', "hacks", NULL, NULL, "jump_label", "patch toolchain bugs/limitations", parse_hacks),
 	OPT_BOOLEAN('i', "ibt", &opts.ibt, "validate and annotate IBT"),
 	OPT_BOOLEAN('m', "mcount", &opts.mcount, "annotate mcount/fentry calls for ftrace"),
 	OPT_BOOLEAN('n', "noinstr", &opts.noinstr, "validate noinstr rules"),
@@ -87,14 +107,15 @@ int cmd_parse_options(int argc, const char **argv, const char * const usage[])
 
 static bool opts_valid(void)
 {
-	if (opts.ibt		||
-	    opts.mcount		||
-	    opts.noinstr	||
-	    opts.orc		||
-	    opts.retpoline	||
-	    opts.sls		||
-	    opts.stackval	||
-	    opts.static_call	||
+	if (opts.hack_jump_label	||
+	    opts.ibt			||
+	    opts.mcount			||
+	    opts.noinstr		||
+	    opts.orc			||
+	    opts.retpoline		||
+	    opts.sls			||
+	    opts.stackval		||
+	    opts.static_call		||
 	    opts.uaccess) {
 		if (opts.dump_orc) {
 			fprintf(stderr, "--dump can't be combined with other options\n");
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index b9ac351ea08b..d157978c58b3 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1592,7 +1592,7 @@ static int handle_jump_alt(struct objtool_file *file,
 		return -1;
 	}
 
-	if (special_alt->key_addend & 2) {
+	if (opts.hack_jump_label && special_alt->key_addend & 2) {
 		struct reloc *reloc = insn_reloc(file, orig_insn);
 
 		if (reloc) {
diff --git a/tools/objtool/include/objtool/builtin.h b/tools/objtool/include/objtool/builtin.h
index dc4757205b8d..c6acf05ec859 100644
--- a/tools/objtool/include/objtool/builtin.h
+++ b/tools/objtool/include/objtool/builtin.h
@@ -12,6 +12,7 @@ extern const struct option check_options[];
 struct opts {
 	/* actions: */
 	bool dump_orc;
+	bool hack_jump_label;
 	bool ibt;
 	bool mcount;
 	bool noinstr;
-- 
cgit v1.2.3-59-g8ed1b


From 22102f4559beaabcea614b29ee090c6a214f002f Mon Sep 17 00:00:00 2001
From: Josh Poimboeuf <jpoimboe@redhat.com>
Date: Mon, 18 Apr 2022 09:50:40 -0700
Subject: objtool: Make noinstr hacks optional

Objtool has some hacks in place to workaround toolchain limitations
which otherwise would break no-instrumentation rules.  Make the hacks
explicit (and optional for other arches) by turning it into a cmdline
option and kernel config option.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/b326eeb9c33231b9dfbb925f194ed7ee40edcd7c.1650300597.git.jpoimboe@redhat.com
---
 arch/Kconfig                            | 3 +++
 arch/x86/Kconfig                        | 1 +
 lib/Kconfig.debug                       | 4 ++--
 lib/Kconfig.kcsan                       | 5 +++--
 scripts/Makefile.build                  | 1 +
 scripts/link-vmlinux.sh                 | 4 ++++
 tools/objtool/builtin-check.c           | 8 +++++++-
 tools/objtool/check.c                   | 2 +-
 tools/objtool/include/objtool/builtin.h | 1 +
 9 files changed, 23 insertions(+), 6 deletions(-)

(limited to 'scripts/Makefile.build')

diff --git a/arch/Kconfig b/arch/Kconfig
index 9dce6d6e3bc3..6ba6e34db0ea 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1035,6 +1035,9 @@ config HAVE_OBJTOOL
 config HAVE_JUMP_LABEL_HACK
 	bool
 
+config HAVE_NOINSTR_HACK
+	bool
+
 config HAVE_STACK_VALIDATION
 	bool
 	help
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 26d012f1eeb8..06e7cdd76691 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -231,6 +231,7 @@ config X86
 	select HAVE_MOD_ARCH_SPECIFIC
 	select HAVE_MOVE_PMD
 	select HAVE_MOVE_PUD
+	select HAVE_NOINSTR_HACK		if HAVE_OBJTOOL
 	select HAVE_NMI
 	select HAVE_OBJTOOL			if X86_64
 	select HAVE_OPTPROBES
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c0e4e47f3ce3..7d2bbc3e558e 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2036,11 +2036,11 @@ config KCOV
 	bool "Code coverage for fuzzing"
 	depends on ARCH_HAS_KCOV
 	depends on CC_HAS_SANCOV_TRACE_PC || GCC_PLUGINS
-	depends on !ARCH_WANTS_NO_INSTR || HAVE_OBJTOOL || \
+	depends on !ARCH_WANTS_NO_INSTR || HAVE_NOINSTR_HACK || \
 		   GCC_VERSION >= 120000 || CLANG_VERSION >= 130000
 	select DEBUG_FS
 	select GCC_PLUGIN_SANCOV if !CC_HAS_SANCOV_TRACE_PC
-	select OBJTOOL if HAVE_OBJTOOL
+	select OBJTOOL if HAVE_NOINSTR_HACK
 	help
 	  KCOV exposes kernel code coverage information in a form suitable
 	  for coverage-guided fuzzing (randomized testing).
diff --git a/lib/Kconfig.kcsan b/lib/Kconfig.kcsan
index 901c3b509aca..47a693c45864 100644
--- a/lib/Kconfig.kcsan
+++ b/lib/Kconfig.kcsan
@@ -187,8 +187,9 @@ config KCSAN_WEAK_MEMORY
 	# We can either let objtool nop __tsan_func_{entry,exit}() and builtin
 	# atomics instrumentation in .noinstr.text, or use a compiler that can
 	# implement __no_kcsan to really remove all instrumentation.
-	depends on HAVE_OBJTOOL || CC_IS_GCC || CLANG_VERSION >= 140000
-	select OBJTOOL if HAVE_OBJTOOL
+	depends on !ARCH_WANTS_NO_INSTR || HAVE_NOINSTR_HACK || \
+		   CC_IS_GCC || CLANG_VERSION >= 140000
+	select OBJTOOL if HAVE_NOINSTR_HACK
 	help
 	  Enable support for modeling a subset of weak memory, which allows
 	  detecting a subset of data races due to missing memory barriers.
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index f1d2c2e4f15b..6c206a1bab97 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -228,6 +228,7 @@ objtool := $(objtree)/tools/objtool/objtool
 
 objtool_args =								\
 	$(if $(CONFIG_HAVE_JUMP_LABEL_HACK), --hacks=jump_label)	\
+	$(if $(CONFIG_HAVE_NOINSTR_HACK), --hacks=noinstr)		\
 	$(if $(CONFIG_X86_KERNEL_IBT), --lto --ibt)			\
 	$(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount)		\
 	$(if $(CONFIG_UNWINDER_ORC), --orc)				\
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index fa1f16840e76..90c9c4c05d95 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -121,6 +121,10 @@ objtool_link()
 			objtoolopt="${objtoolopt} --hacks=jump_label"
 		fi
 
+		if is_enabled CONFIG_HAVE_NOINSTR_HACK; then
+			objtoolopt="${objtoolopt} --hacks=noinstr"
+		fi
+
 		if is_enabled CONFIG_X86_KERNEL_IBT; then
 			objtoolopt="${objtoolopt} --ibt"
 		fi
diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
index b2c626d9e2bf..1803a63147e4 100644
--- a/tools/objtool/builtin-check.c
+++ b/tools/objtool/builtin-check.c
@@ -47,12 +47,17 @@ static int parse_hacks(const struct option *opt, const char *str, int unset)
 		found = true;
 	}
 
+	if (!str || strstr(str, "noinstr")) {
+		opts.hack_noinstr = true;
+		found = true;
+	}
+
 	return found ? 0 : -1;
 }
 
 const struct option check_options[] = {
 	OPT_GROUP("Actions:"),
-	OPT_CALLBACK_OPTARG('h', "hacks", NULL, NULL, "jump_label", "patch toolchain bugs/limitations", parse_hacks),
+	OPT_CALLBACK_OPTARG('h', "hacks", NULL, NULL, "jump_label,noinstr", "patch toolchain bugs/limitations", parse_hacks),
 	OPT_BOOLEAN('i', "ibt", &opts.ibt, "validate and annotate IBT"),
 	OPT_BOOLEAN('m', "mcount", &opts.mcount, "annotate mcount/fentry calls for ftrace"),
 	OPT_BOOLEAN('n', "noinstr", &opts.noinstr, "validate noinstr rules"),
@@ -108,6 +113,7 @@ int cmd_parse_options(int argc, const char **argv, const char * const usage[])
 static bool opts_valid(void)
 {
 	if (opts.hack_jump_label	||
+	    opts.hack_noinstr		||
 	    opts.ibt			||
 	    opts.mcount			||
 	    opts.noinstr		||
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index d157978c58b3..30b24dce48b5 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1144,7 +1144,7 @@ static void annotate_call_site(struct objtool_file *file,
 	 * attribute so they need a little help, NOP out any such calls from
 	 * noinstr text.
 	 */
-	if (insn->sec->noinstr && sym->profiling_func) {
+	if (opts.hack_noinstr && insn->sec->noinstr && sym->profiling_func) {
 		if (reloc) {
 			reloc->type = R_NONE;
 			elf_write_reloc(file->elf, reloc);
diff --git a/tools/objtool/include/objtool/builtin.h b/tools/objtool/include/objtool/builtin.h
index c6acf05ec859..f3a1a754b5c4 100644
--- a/tools/objtool/include/objtool/builtin.h
+++ b/tools/objtool/include/objtool/builtin.h
@@ -13,6 +13,7 @@ struct opts {
 	/* actions: */
 	bool dump_orc;
 	bool hack_jump_label;
+	bool hack_noinstr;
 	bool ibt;
 	bool mcount;
 	bool noinstr;
-- 
cgit v1.2.3-59-g8ed1b


From 753da4179d08b625d8df72e97724e22749969fd3 Mon Sep 17 00:00:00 2001
From: Josh Poimboeuf <jpoimboe@redhat.com>
Date: Mon, 18 Apr 2022 09:50:43 -0700
Subject: objtool: Remove --lto and --vmlinux in favor of --link

The '--lto' option is a confusing way of telling objtool to do stack
validation despite it being a linked object.  It's no longer needed now
that an explicit '--stackval' option exists.  The '--vmlinux' option is
also redundant.

Remove both options in favor of a straightforward '--link' option which
identifies a linked object.

Also, implicitly set '--link' with a warning if the user forgets to do
so and we can tell that it's a linked object.  This makes it easier for
manual vmlinux runs.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/dcd3ceffd15a54822c6183e5766d21ad06082b45.1650300597.git.jpoimboe@redhat.com
---
 scripts/Makefile.build                  |  4 +++-
 scripts/link-vmlinux.sh                 |  8 +++----
 tools/objtool/builtin-check.c           | 39 ++++++++++++++++++++++++++++----
 tools/objtool/check.c                   | 40 ++++++++++++---------------------
 tools/objtool/elf.c                     |  3 +++
 tools/objtool/include/objtool/builtin.h |  3 +--
 tools/objtool/include/objtool/elf.h     | 12 +++++++++-
 7 files changed, 70 insertions(+), 39 deletions(-)

(limited to 'scripts/Makefile.build')

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 6c206a1bab97..ac8167227bc0 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -229,7 +229,7 @@ objtool := $(objtree)/tools/objtool/objtool
 objtool_args =								\
 	$(if $(CONFIG_HAVE_JUMP_LABEL_HACK), --hacks=jump_label)	\
 	$(if $(CONFIG_HAVE_NOINSTR_HACK), --hacks=noinstr)		\
-	$(if $(CONFIG_X86_KERNEL_IBT), --lto --ibt)			\
+	$(if $(CONFIG_X86_KERNEL_IBT), --ibt)				\
 	$(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount)		\
 	$(if $(CONFIG_UNWINDER_ORC), --orc)				\
 	$(if $(CONFIG_RETPOLINE), --retpoline)				\
@@ -237,6 +237,7 @@ objtool_args =								\
 	$(if $(CONFIG_STACK_VALIDATION), --stackval)			\
 	$(if $(CONFIG_HAVE_STATIC_CALL_INLINE), --static-call)		\
 	$(if $(CONFIG_X86_SMAP), --uaccess)				\
+	$(if $(linked-object), --link)					\
 	$(if $(part-of-module), --module)				\
 	$(if $(CONFIG_GCOV_KERNEL), --no-unreachable)
 
@@ -306,6 +307,7 @@ quiet_cmd_cc_prelink_modules = LD [M]  $@
 # modules into native code
 $(obj)/%.prelink.o: objtool-enabled = y
 $(obj)/%.prelink.o: part-of-module := y
+$(obj)/%.prelink.o: linked-object := y
 
 $(obj)/%.prelink.o: $(obj)/%.o FORCE
 	$(call if_changed,cc_prelink_modules)
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index fce4f41816cd..eb9324f07f3d 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -114,8 +114,8 @@ objtool_link()
 
 	if is_enabled CONFIG_LTO_CLANG || is_enabled CONFIG_X86_KERNEL_IBT; then
 
-		# Don't perform vmlinux validation unless explicitly requested,
-		# but run objtool on vmlinux.o now that we have an object file.
+		# For LTO and IBT, objtool doesn't run on individual
+		# translation units.  Run everything on vmlinux instead.
 
 		if is_enabled CONFIG_HAVE_JUMP_LABEL_HACK; then
 			objtoolopt="${objtoolopt} --hacks=jump_label"
@@ -156,8 +156,6 @@ objtool_link()
 		if is_enabled CONFIG_X86_SMAP; then
 			objtoolopt="${objtoolopt} --uaccess"
 		fi
-
-		objtoolopt="${objtoolopt} --lto"
 	fi
 
 	if is_enabled CONFIG_NOINSTR_VALIDATION; then
@@ -170,7 +168,7 @@ objtool_link()
 			objtoolopt="${objtoolopt} --no-unreachable"
 		fi
 
-		objtoolopt="${objtoolopt} --vmlinux"
+		objtoolopt="${objtoolopt} --link"
 
 		info OBJTOOL ${1}
 		tools/objtool/objtool ${objtoolopt} ${1}
diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
index 1803a63147e4..f4c3a5091737 100644
--- a/tools/objtool/builtin-check.c
+++ b/tools/objtool/builtin-check.c
@@ -9,6 +9,11 @@
 #include <objtool/builtin.h>
 #include <objtool/objtool.h>
 
+#define ERROR(format, ...)				\
+	fprintf(stderr,					\
+		"error: objtool: " format "\n",		\
+		##__VA_ARGS__)
+
 struct opts opts;
 
 static const char * const check_usage[] = {
@@ -73,12 +78,11 @@ const struct option check_options[] = {
 	OPT_BOOLEAN(0, "backtrace", &opts.backtrace, "unwind on error"),
 	OPT_BOOLEAN(0, "backup", &opts.backup, "create .orig files before modification"),
 	OPT_BOOLEAN(0, "dry-run", &opts.dryrun, "don't write modifications"),
-	OPT_BOOLEAN(0, "lto", &opts.lto, "whole-archive like runs"),
+	OPT_BOOLEAN(0, "link", &opts.link, "object is a linked object"),
 	OPT_BOOLEAN(0, "module", &opts.module, "object is part of a kernel module"),
 	OPT_BOOLEAN(0, "no-unreachable", &opts.no_unreachable, "skip 'unreachable instruction' warnings"),
 	OPT_BOOLEAN(0, "sec-address", &opts.sec_address, "print section addresses in warnings"),
 	OPT_BOOLEAN(0, "stats", &opts.stats, "print statistics"),
-	OPT_BOOLEAN(0, "vmlinux", &opts.vmlinux, "vmlinux.o validation"),
 
 	OPT_END(),
 };
@@ -124,7 +128,7 @@ static bool opts_valid(void)
 	    opts.static_call		||
 	    opts.uaccess) {
 		if (opts.dump_orc) {
-			fprintf(stderr, "--dump can't be combined with other options\n");
+			ERROR("--dump can't be combined with other options");
 			return false;
 		}
 
@@ -134,10 +138,34 @@ static bool opts_valid(void)
 	if (opts.dump_orc)
 		return true;
 
-	fprintf(stderr, "At least one command required\n");
+	ERROR("At least one command required");
 	return false;
 }
 
+static bool link_opts_valid(struct objtool_file *file)
+{
+	if (opts.link)
+		return true;
+
+	if (has_multiple_files(file->elf)) {
+		ERROR("Linked object detected, forcing --link");
+		opts.link = true;
+		return true;
+	}
+
+	if (opts.noinstr) {
+		ERROR("--noinstr requires --link");
+		return false;
+	}
+
+	if (opts.ibt) {
+		ERROR("--ibt requires --link");
+		return false;
+	}
+
+	return true;
+}
+
 int objtool_run(int argc, const char **argv)
 {
 	const char *objname;
@@ -157,6 +185,9 @@ int objtool_run(int argc, const char **argv)
 	if (!file)
 		return 1;
 
+	if (!link_opts_valid(file))
+		return 1;
+
 	ret = check(file);
 	if (ret)
 		return ret;
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 30b24dce48b5..2063f9fea1a2 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -263,7 +263,8 @@ static void init_cfi_state(struct cfi_state *cfi)
 	cfi->drap_offset = -1;
 }
 
-static void init_insn_state(struct insn_state *state, struct section *sec)
+static void init_insn_state(struct objtool_file *file, struct insn_state *state,
+			    struct section *sec)
 {
 	memset(state, 0, sizeof(*state));
 	init_cfi_state(&state->cfi);
@@ -273,7 +274,7 @@ static void init_insn_state(struct insn_state *state, struct section *sec)
 	 * not correctly determine insn->call_dest->sec (external symbols do
 	 * not have a section).
 	 */
-	if (opts.vmlinux && opts.noinstr && sec)
+	if (opts.link && opts.noinstr && sec)
 		state->noinstr = sec->noinstr;
 }
 
@@ -3405,7 +3406,7 @@ static int validate_unwind_hints(struct objtool_file *file, struct section *sec)
 	if (!file->hints)
 		return 0;
 
-	init_insn_state(&state, sec);
+	init_insn_state(file, &state, sec);
 
 	if (sec) {
 		insn = find_insn(file, sec, 0);
@@ -3491,14 +3492,14 @@ static bool ignore_unreachable_insn(struct objtool_file *file, struct instructio
 		return true;
 
 	/*
-	 * Whole archive runs might encounder dead code from weak symbols.
+	 * Whole archive runs might encounter dead code from weak symbols.
 	 * This is where the linker will have dropped the weak symbol in
 	 * favour of a regular symbol, but leaves the code in place.
 	 *
 	 * In this case we'll find a piece of code (whole function) that is not
 	 * covered by a !section symbol. Ignore them.
 	 */
-	if (!insn->func && opts.lto) {
+	if (opts.link && !insn->func) {
 		int size = find_symbol_hole_containing(insn->sec, insn->offset);
 		unsigned long end = insn->offset + size;
 
@@ -3620,7 +3621,7 @@ static int validate_section(struct objtool_file *file, struct section *sec)
 		if (func->type != STT_FUNC)
 			continue;
 
-		init_insn_state(&state, sec);
+		init_insn_state(file, &state, sec);
 		set_func_state(&state.cfi);
 
 		warnings += validate_symbol(file, sec, func, &state);
@@ -3629,7 +3630,7 @@ static int validate_section(struct objtool_file *file, struct section *sec)
 	return warnings;
 }
 
-static int validate_vmlinux_functions(struct objtool_file *file)
+static int validate_noinstr_sections(struct objtool_file *file)
 {
 	struct section *sec;
 	int warnings = 0;
@@ -3890,16 +3891,6 @@ int check(struct objtool_file *file)
 {
 	int ret, warnings = 0;
 
-	if (opts.lto && !(opts.vmlinux || opts.module)) {
-		fprintf(stderr, "--lto requires: --vmlinux or --module\n");
-		return 1;
-	}
-
-	if (opts.ibt && !opts.lto) {
-		fprintf(stderr, "--ibt requires: --lto\n");
-		return 1;
-	}
-
 	arch_initial_func_cfi_state(&initial_func_cfi);
 	init_cfi_state(&init_cfi);
 	init_cfi_state(&func_cfi);
@@ -3920,15 +3911,6 @@ int check(struct objtool_file *file)
 	if (list_empty(&file->insn_list))
 		goto out;
 
-	if (opts.vmlinux && !opts.lto) {
-		ret = validate_vmlinux_functions(file);
-		if (ret < 0)
-			goto out;
-
-		warnings += ret;
-		goto out;
-	}
-
 	if (opts.retpoline) {
 		ret = validate_retpoline(file);
 		if (ret < 0)
@@ -3953,6 +3935,12 @@ int check(struct objtool_file *file)
 				goto out;
 			warnings += ret;
 		}
+
+	} else if (opts.noinstr) {
+		ret = validate_noinstr_sections(file);
+		if (ret < 0)
+			goto out;
+		warnings += ret;
 	}
 
 	if (opts.ibt) {
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index 0f6fa372e10e..583a3ec987b5 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -377,6 +377,9 @@ static void elf_add_symbol(struct elf *elf, struct symbol *sym)
 	sym->type = GELF_ST_TYPE(sym->sym.st_info);
 	sym->bind = GELF_ST_BIND(sym->sym.st_info);
 
+	if (sym->type == STT_FILE)
+		elf->num_files++;
+
 	sym->offset = sym->sym.st_value;
 	sym->len = sym->sym.st_size;
 
diff --git a/tools/objtool/include/objtool/builtin.h b/tools/objtool/include/objtool/builtin.h
index f3a1a754b5c4..280ea18b7f2b 100644
--- a/tools/objtool/include/objtool/builtin.h
+++ b/tools/objtool/include/objtool/builtin.h
@@ -28,12 +28,11 @@ struct opts {
 	bool backtrace;
 	bool backup;
 	bool dryrun;
-	bool lto;
+	bool link;
 	bool module;
 	bool no_unreachable;
 	bool sec_address;
 	bool stats;
-	bool vmlinux;
 };
 
 extern struct opts opts;
diff --git a/tools/objtool/include/objtool/elf.h b/tools/objtool/include/objtool/elf.h
index 9b36802ed86f..de0cb2f313ba 100644
--- a/tools/objtool/include/objtool/elf.h
+++ b/tools/objtool/include/objtool/elf.h
@@ -86,7 +86,7 @@ struct elf {
 	int fd;
 	bool changed;
 	char *name;
-	unsigned int text_size;
+	unsigned int text_size, num_files;
 	struct list_head sections;
 
 	int symbol_bits;
@@ -131,6 +131,16 @@ static inline u32 reloc_hash(struct reloc *reloc)
 	return sec_offset_hash(reloc->sec, reloc->offset);
 }
 
+/*
+ * Try to see if it's a whole archive (vmlinux.o or module).
+ *
+ * Note this will miss the case where a module only has one source file.
+ */
+static inline bool has_multiple_files(struct elf *elf)
+{
+	return elf->num_files > 1;
+}
+
 struct elf *elf_open_read(const char *name, int flags);
 struct section *elf_create_section(struct elf *elf, const char *name, unsigned int sh_flags, size_t entsize, int nr);
 
-- 
cgit v1.2.3-59-g8ed1b