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authorJosh Poimboeuf <jpoimboe@redhat.com>2016-02-28 22:22:34 -0600
committerIngo Molnar <mingo@kernel.org>2016-02-29 08:35:02 +0100
commitc0dd671686b2229e888ede77682ab0633b2a0dd7 (patch)
treea8c3b5bafef79b1bc1d20ffec0355bde4ddec55c /arch/x86/boot/Makefile
parent319e305ca469d9484678d2916590005b08cc3b4b (diff)
objtool: Mark non-standard object files and directories
Code which runs outside the kernel's normal mode of operation often does unusual things which can cause a static analysis tool like objtool to emit false positive warnings: - boot image - vdso image - relocation - realmode - efi - head - purgatory - modpost Set OBJECT_FILES_NON_STANDARD for their related files and directories, which will tell objtool to skip checking them. It's ok to skip them because they don't affect runtime stack traces. Also skip the following code which does the right thing with respect to frame pointers, but is too "special" to be validated by a tool: - entry - mcount Also skip the test_nx module because it modifies its exception handling table at runtime, which objtool can't understand. Fortunately it's just a test module so it doesn't matter much. Currently objtool is the only user of OBJECT_FILES_NON_STANDARD, but it might eventually be useful for other tools. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Bernd Petrovitsch <bernd@petrovitsch.priv.at> Cc: Borislav Petkov <bp@alien8.de> Cc: Chris J Arges <chris.j.arges@canonical.com> Cc: Jiri Slaby <jslaby@suse.cz> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Michal Marek <mmarek@suse.cz> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Pedro Alves <palves@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: live-patching@vger.kernel.org Link: http://lkml.kernel.org/r/366c080e3844e8a5b6a0327dc7e8c2b90ca3baeb.1456719558.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/boot/Makefile')
-rw-r--r--arch/x86/boot/Makefile3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile
index bbe1a62efc02..0bf6749522d9 100644
--- a/arch/x86/boot/Makefile
+++ b/arch/x86/boot/Makefile
@@ -9,7 +9,8 @@
# Changed by many, many contributors over the years.
#
-KASAN_SANITIZE := n
+KASAN_SANITIZE := n
+OBJECT_FILES_NON_STANDARD := y
# If you want to preset the SVGA mode, uncomment the next line and
# set SVGA_MODE to whatever number you want.