[tip: core/objtool] objtool: Fail the kernel build on fatal errors

[tip-bot2 for Josh Poimboeuf]

The following commit has been merged into the core/objtool branch of tip:

Commit-ID:     644592d328370af4b3e027b7b1ae9f81613782d8
Gitweb:        https://git.kernel.org/tip/644592d328370af4b3e027b7b1ae9f81613782d8
Author:        Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
AuthorDate:    Mon, 10 Feb 2020 12:32:38 -06:00
Committer:     Borislav Petkov <bp@xxxxxxx>
CommitterDate: Tue, 11 Feb 2020 13:27:03 +01:00

objtool: Fail the kernel build on fatal errors

When objtool encounters a fatal error, it usually means the binary is
corrupt or otherwise broken in some way.  Up until now, such errors were
just treated as warnings which didn't fail the kernel build.

However, objtool is now stable enough that if a fatal error is
discovered, it most likely means something is seriously wrong and it
should fail the kernel build.

Note that this doesn't apply to "normal" objtool warnings; only fatal
ones.

Suggested-by: Borislav Petkov <bp@xxxxxxx>
Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Reviewed-by: Julien Thierry <jthierry@xxxxxxxxxx>
Link: https://lkml.kernel.org/r/f18c3743de0fef673d49dd35760f26bdef7f6fc3.1581359535.git.jpoimboe@xxxxxxxxxx
---
 tools/objtool/check.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 4768d91..796f6a1 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2491,8 +2491,14 @@ int check(const char *_objname, bool orc)
 out:
 	cleanup(&file);
 
-	/* ignore warnings for now until we get all the code cleaned up */
-	if (ret || warnings)
-		return 0;
+	if (ret < 0) {
+		/*
+		 *  Fatal error.  The binary is corrupt or otherwise broken in
+		 *  some way, or objtool itself is broken.  Fail the kernel
+		 *  build.
+		 */
+		return ret;
+	}
+
 	return 0;
 }