linux-kernel - [PATCH] ubsan: mark ubsan_type_mismatch

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Message-Id: <20190617123109.667090-1-arnd@arndb.de>
Date:   Mon, 17 Jun 2019 14:31:09 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        akpm@...ux-foundation.org
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        stable@...r.kernel.org
Subject: [PATCH] ubsan: mark ubsan_type_mismatch_common inline

objtool points out a condition that it does not like:

lib/ubsan.o: warning: objtool: __ubsan_handle_type_mismatch()+0x4a: call to stackleak_track_stack() with UACCESS enabled
lib/ubsan.o: warning: objtool: __ubsan_handle_type_mismatch_v1()+0x4a: call to stackleak_track_stack() with UACCESS enabled

I guess this is related to the call ubsan_type_mismatch_common()
not being inline before it calls user_access_restore(), though
I don't fully understand why that is a problem.

Marking the function inline shuts up the warning and might be
the right thing to do. The patch that caused this is marked
for stable backports, so this one should probably be backported
as well.

Fixes: 42440c1f9911 ("lib/ubsan: add type mismatch handler for new GCC/Clang")
Cc: stable@...r.kernel.org
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 lib/ubsan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/ubsan.c b/lib/ubsan.c
index ecc179338094..3d8836f0fc5c 100644
--- a/lib/ubsan.c
+++ b/lib/ubsan.c
@@ -309,7 +309,7 @@ static void handle_object_size_mismatch(struct type_mismatch_data_common *data,
 	ubsan_epilogue(&flags);
 }
 
-static void ubsan_type_mismatch_common(struct type_mismatch_data_common *data,
+static __always_inline void ubsan_type_mismatch_common(struct type_mismatch_data_common *data,
 				unsigned long ptr)
 {
 	unsigned long flags = user_access_save();
-- 
2.20.0