From: Josh Poimboeuf <jpoimboe@redhat.com>
To: x86@kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>,
linux-kernel@vger.kernel.org, Miroslav Benes <mbenes@suse.cz>
Subject: [PATCH 00/18] objtool: Interface overhaul
Date: Wed, 13 Apr 2022 16:19:35 -0700 [thread overview]
Message-ID: <cover.1649891421.git.jpoimboe@redhat.com> (raw)
Objtool's interface has some issues:
- Several features are done unconditionally, without any way to turn
them off. Some of them might be surprising. This makes objtool
tricky to use, and prevents porting individual features to other
arches.
- The config dependencies are too coarse-grained. Objtool enablement is
tied to CONFIG_STACK_VALIDATION, but it has several other features
independent of that.
- The objtool subcmds ("check" and "orc") are clumsy: "check" is really
a subset of "orc", so it has all the same options. The subcmd model
has never really worked for objtool, as it only has a single purpose:
"do some combination of things on an object file".
- The '--lto' and '--vmlinux' options are nonsensical and have
surprising behavior.
Overhaul the interface:
- get rid of subcmds
- make all features individually selectable
- remove and/or clarify confusing/obsolete options
- update the documentation
- fix some bugs found along the way
TODO: rename files...
$ tools/objtool/objtool --help
Usage: objtool <actions> [<options>] file.o
Actions:
-h, --hacks patch some toolchain bugs/limitations
-i, --ibt validate and annotate IBT
-m, --mcount annotate mcount/fentry calls for ftrace
-n, --noinstr validate noinstr rules
-o, --orc generate ORC metadata
-r, --retpoline validate and annotate retpoline usage
-S, --sls validate straight-line-speculation mitigations
-s, --stackval validate frame pointer rules
-t, --static-call annotate static calls
-u, --uaccess validate uaccess rules for SMAP
--dump <orc> dump object data
Options:
--backtrace unwind on error
--backup create .orig files before modification
--dry-run don't write modifications
--module object is part of a kernel module
--no-unreachable skip 'unreachable instruction' warnings
--stats print statistics
Josh Poimboeuf (18):
objtool: Enable unreachable warnings for CLANG LTO
objtool: Support data symbol printing
objtool: Add sec+offset to warnings
objtool: Print data address for "!ENDBR" data warnings
objtool: Use offstr() to print address of missing ENDBR
libsubcmd: Fix OPTION_GROUP sorting
objtool: Reorganize cmdline options
objtool: Ditch subcommands
objtool: Add stack validation cmdline option
objtool: Extricate ibt from stack validation
objtool: Add CONFIG_OBJTOOL
objtool: Make stack validation frame-pointer-specific
objtool: Add static call cmdline option
objtool: Add toolchain hacks cmdline option
objtool: Rename "VMLINUX_VALIDATION" -> "NOINSTR_VALIDATION"
objtool: Add HAVE_NOINSTR_VALIDATION
objtool: Remove --lto and --vmlinux
objtool: Update documentation
Makefile | 2 +-
arch/Kconfig | 15 +-
arch/x86/Kconfig | 20 +-
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 | 22 +-
lib/Kconfig.kcsan | 3 +-
lib/Kconfig.ubsan | 2 +-
scripts/Makefile.build | 20 +-
scripts/link-vmlinux.sh | 62 +--
scripts/package/builddeb | 2 +-
tools/include/linux/objtool.h | 6 +-
tools/lib/subcmd/parse-options.c | 17 +-
tools/objtool/Build | 12 +-
.../{stack-validation.txt => objtool.txt} | 122 +++++-
tools/objtool/Makefile | 8 +-
tools/objtool/arch/x86/decode.c | 2 +-
tools/objtool/arch/x86/special.c | 2 +-
tools/objtool/builtin-check.c | 123 ++++--
tools/objtool/builtin-orc.c | 73 ----
tools/objtool/check.c | 391 +++++++++---------
tools/objtool/elf.c | 11 +-
tools/objtool/include/objtool/builtin.h | 36 +-
tools/objtool/include/objtool/elf.h | 8 +-
tools/objtool/include/objtool/warn.h | 52 +--
tools/objtool/objtool.c | 103 +----
tools/objtool/weak.c | 9 +-
32 files changed, 594 insertions(+), 562 deletions(-)
rename tools/objtool/Documentation/{stack-validation.txt => objtool.txt} (80%)
delete mode 100644 tools/objtool/builtin-orc.c
--
2.34.1
next reply other threads:[~2022-04-13 23:20 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-13 23:19 Josh Poimboeuf [this message]
2022-04-13 23:19 ` [PATCH 01/18] objtool: Enable unreachable warnings for CLANG LTO Josh Poimboeuf
2022-04-13 23:19 ` [PATCH 02/18] objtool: Support data symbol printing Josh Poimboeuf
2022-04-14 7:05 ` Peter Zijlstra
2022-04-14 15:21 ` Josh Poimboeuf
2022-04-14 15:31 ` Peter Zijlstra
2022-04-14 15:38 ` Josh Poimboeuf
2022-04-14 16:36 ` Peter Zijlstra
2022-04-14 17:01 ` Josh Poimboeuf
2022-04-14 17:21 ` Josh Poimboeuf
2022-04-13 23:19 ` [PATCH 03/18] objtool: Add sec+offset to warnings Josh Poimboeuf
2022-04-13 23:19 ` [PATCH 04/18] objtool: Print data address for "!ENDBR" data warnings Josh Poimboeuf
2022-04-14 7:36 ` Peter Zijlstra
2022-04-13 23:19 ` [PATCH 05/18] objtool: Use offstr() to print address of missing ENDBR Josh Poimboeuf
2022-04-13 23:19 ` [PATCH 06/18] libsubcmd: Fix OPTION_GROUP sorting Josh Poimboeuf
2022-04-13 23:19 ` [PATCH 07/18] objtool: Reorganize cmdline options Josh Poimboeuf
2022-04-13 23:19 ` [PATCH 08/18] objtool: Ditch subcommands Josh Poimboeuf
2022-04-13 23:19 ` [PATCH 09/18] objtool: Add stack validation cmdline option Josh Poimboeuf
2022-04-14 8:43 ` Peter Zijlstra
2022-04-14 15:52 ` Josh Poimboeuf
2022-04-13 23:19 ` [PATCH 10/18] objtool: Extricate ibt from stack validation Josh Poimboeuf
2022-04-14 7:53 ` Peter Zijlstra
2022-04-14 15:44 ` Josh Poimboeuf
2022-04-14 16:38 ` Peter Zijlstra
2022-04-14 17:05 ` Josh Poimboeuf
2022-04-14 18:25 ` Josh Poimboeuf
2022-04-14 19:01 ` Peter Zijlstra
2022-04-14 19:07 ` Josh Poimboeuf
2022-04-14 18:49 ` Peter Zijlstra
2022-04-13 23:19 ` [PATCH 11/18] objtool: Add CONFIG_OBJTOOL Josh Poimboeuf
2022-04-13 23:19 ` [PATCH 12/18] objtool: Make stack validation frame-pointer-specific Josh Poimboeuf
2022-04-13 23:19 ` [PATCH 13/18] objtool: Add static call cmdline option Josh Poimboeuf
2022-04-13 23:19 ` [PATCH 14/18] objtool: Add toolchain hacks " Josh Poimboeuf
2022-04-14 8:09 ` Peter Zijlstra
2022-04-14 15:49 ` Josh Poimboeuf
2022-04-13 23:19 ` [PATCH 15/18] objtool: Rename "VMLINUX_VALIDATION" -> "NOINSTR_VALIDATION" Josh Poimboeuf
2022-04-13 23:19 ` [PATCH 16/18] objtool: Add HAVE_NOINSTR_VALIDATION Josh Poimboeuf
2022-04-13 23:19 ` [PATCH 17/18] objtool: Remove --lto and --vmlinux Josh Poimboeuf
2022-04-14 8:13 ` Peter Zijlstra
2022-04-15 2:18 ` Josh Poimboeuf
2022-04-13 23:19 ` [PATCH 18/18] objtool: Update documentation Josh Poimboeuf
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