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c4a33939a7
Validate that any call out of .noinstr.text is in between instr_begin() and instr_end() annotations. This annotation is useful to ensure correct behaviour wrt tracing sensitive code like entry/exit and idle code. When we run code in a sensitive context we want a guarantee no unknown code is ran. Since this validation relies on knowing the section of call destination symbols, we must run it on vmlinux.o instead of on individual object files. Add two options: -d/--duplicate "duplicate validation for vmlinux" -l/--vmlinux "vmlinux.o validation" Where the latter auto-detects when objname ends with "vmlinux.o" and the former will force all validations, also those already done on !vmlinux object files. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Miroslav Benes <mbenes@suse.cz> Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Link: https://lkml.kernel.org/r/20200416115119.106268040@infradead.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2015-2017 Josh Poimboeuf <jpoimboe@redhat.com>
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*/
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/*
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* objtool check:
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*
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* This command analyzes every .o file and ensures the validity of its stack
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* trace metadata. It enforces a set of rules on asm code and C inline
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* assembly code so that stack traces can be reliable.
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*
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* For more information, see tools/objtool/Documentation/stack-validation.txt.
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*/
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#include <subcmd/parse-options.h>
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#include <string.h>
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#include "builtin.h"
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#include "check.h"
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bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats, validate_dup, vmlinux;
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static const char * const check_usage[] = {
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"objtool check [<options>] file.o",
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NULL,
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};
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const struct option check_options[] = {
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OPT_BOOLEAN('f', "no-fp", &no_fp, "Skip frame pointer validation"),
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OPT_BOOLEAN('u', "no-unreachable", &no_unreachable, "Skip 'unreachable instruction' warnings"),
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OPT_BOOLEAN('r', "retpoline", &retpoline, "Validate retpoline assumptions"),
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OPT_BOOLEAN('m', "module", &module, "Indicates the object will be part of a kernel module"),
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OPT_BOOLEAN('b', "backtrace", &backtrace, "unwind on error"),
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OPT_BOOLEAN('a', "uaccess", &uaccess, "enable uaccess checking"),
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OPT_BOOLEAN('s', "stats", &stats, "print statistics"),
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OPT_BOOLEAN('d', "duplicate", &validate_dup, "duplicate validation for vmlinux.o"),
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OPT_BOOLEAN('l', "vmlinux", &vmlinux, "vmlinux.o validation"),
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OPT_END(),
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};
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int cmd_check(int argc, const char **argv)
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{
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const char *objname, *s;
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argc = parse_options(argc, argv, check_options, check_usage, 0);
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if (argc != 1)
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usage_with_options(check_usage, check_options);
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objname = argv[0];
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s = strstr(objname, "vmlinux.o");
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if (s && !s[9])
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vmlinux = true;
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return check(objname, false);
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}
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