mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 00:48:50 +00:00
900b4df347
Teach objtool to parse options from the OBJTOOL_ARGS environment
variable.
This enables things like:
$ OBJTOOL_ARGS="--backup" make O=defconfig-build/ kernel/ponies.o
to obtain both defconfig-build/kernel/ponies.o{,.orig} and easily
inspect what objtool actually did.
Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20210226110004.252553847@infradead.org
99 lines
2.7 KiB
C
99 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* 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>
|
|
#include <objtool/builtin.h>
|
|
#include <objtool/objtool.h>
|
|
|
|
bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats,
|
|
validate_dup, vmlinux, mcount, noinstr, backup;
|
|
|
|
static const char * const check_usage[] = {
|
|
"objtool check [<options>] file.o",
|
|
NULL,
|
|
};
|
|
|
|
static const char * const env_usage[] = {
|
|
"OBJTOOL_ARGS=\"<options>\"",
|
|
NULL,
|
|
};
|
|
|
|
const struct option check_options[] = {
|
|
OPT_BOOLEAN('f', "no-fp", &no_fp, "Skip frame pointer validation"),
|
|
OPT_BOOLEAN('u', "no-unreachable", &no_unreachable, "Skip 'unreachable instruction' warnings"),
|
|
OPT_BOOLEAN('r', "retpoline", &retpoline, "Validate retpoline assumptions"),
|
|
OPT_BOOLEAN('m', "module", &module, "Indicates the object will be part of a kernel module"),
|
|
OPT_BOOLEAN('b', "backtrace", &backtrace, "unwind on error"),
|
|
OPT_BOOLEAN('a', "uaccess", &uaccess, "enable uaccess checking"),
|
|
OPT_BOOLEAN('s', "stats", &stats, "print statistics"),
|
|
OPT_BOOLEAN('d', "duplicate", &validate_dup, "duplicate validation for vmlinux.o"),
|
|
OPT_BOOLEAN('n', "noinstr", &noinstr, "noinstr validation for vmlinux.o"),
|
|
OPT_BOOLEAN('l', "vmlinux", &vmlinux, "vmlinux.o validation"),
|
|
OPT_BOOLEAN('M', "mcount", &mcount, "generate __mcount_loc"),
|
|
OPT_BOOLEAN('B', "backup", &backup, "create .orig files before modification"),
|
|
OPT_END(),
|
|
};
|
|
|
|
int cmd_parse_options(int argc, const char **argv, const char * const usage[])
|
|
{
|
|
const char *envv[16] = { };
|
|
char *env;
|
|
int envc;
|
|
|
|
env = getenv("OBJTOOL_ARGS");
|
|
if (env) {
|
|
envv[0] = "OBJTOOL_ARGS";
|
|
for (envc = 1; envc < ARRAY_SIZE(envv); ) {
|
|
envv[envc++] = env;
|
|
env = strchr(env, ' ');
|
|
if (!env)
|
|
break;
|
|
*env = '\0';
|
|
env++;
|
|
}
|
|
|
|
parse_options(envc, envv, check_options, env_usage, 0);
|
|
}
|
|
|
|
argc = parse_options(argc, argv, check_options, usage, 0);
|
|
if (argc != 1)
|
|
usage_with_options(usage, check_options);
|
|
return argc;
|
|
}
|
|
|
|
int cmd_check(int argc, const char **argv)
|
|
{
|
|
const char *objname;
|
|
struct objtool_file *file;
|
|
int ret;
|
|
|
|
argc = cmd_parse_options(argc, argv, check_usage);
|
|
objname = argv[0];
|
|
|
|
file = objtool_open_read(objname);
|
|
if (!file)
|
|
return 1;
|
|
|
|
ret = check(file);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (file->elf->changed)
|
|
return elf_write(file->elf);
|
|
|
|
return 0;
|
|
}
|