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objtool: Add --dry-run

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Add a --dry-run argument to skip writing the modifications. This is
convenient for debugging.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20220308154317.282720146@infradead.org
This commit is contained in:
Peter Zijlstra 2022-03-08 16:30:13 +01:00
parent b44544fe02
commit f2d3a25089
3 changed files with 6 additions and 2 deletions
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3
tools/objtool/builtin-check.c
View file

@ -20,7 +20,7 @@
#include <objtool/objtool.h>
bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats,
validate_dup, vmlinux, mcount, noinstr, backup, sls;
validate_dup, vmlinux, mcount, noinstr, backup, sls, dryrun;
static const char * const check_usage[] = {
"objtool check [<options>] file.o",
@ -46,6 +46,7 @@ const struct option check_options[] = {
OPT_BOOLEAN('M', "mcount", &mcount, "generate __mcount_loc"),
OPT_BOOLEAN('B', "backup", &backup, "create .orig files before modification"),
OPT_BOOLEAN('S', "sls", &sls, "validate straight-line-speculation"),
OPT_BOOLEAN(0, "dry-run", &dryrun, "don't write the modifications"),
OPT_END(),
};

3
tools/objtool/elf.c
View file

@ -1019,6 +1019,9 @@ int elf_write(struct elf *elf)
struct section *sec;
Elf_Scn *s;
if (dryrun)
return 0;
/* Update changed relocation sections and section headers: */
list_for_each_entry(sec, &elf->sections, list) {
if (sec->changed) {

2
tools/objtool/include/objtool/builtin.h
View file

@ -9,7 +9,7 @@
extern const struct option check_options[];
extern bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats,
validate_dup, vmlinux, mcount, noinstr, backup, sls;
validate_dup, vmlinux, mcount, noinstr, backup, sls, dryrun;
extern int cmd_parse_options(int argc, const char **argv, const char * const usage[]);