linux-kernel - [PATCH 3/4] objdump: add UACCESS exception for more stringops

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Message-Id: <20230208164011.2287122-3-arnd@kernel.org>
Date:   Wed,  8 Feb 2023 17:39:57 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Josh Poimboeuf <jpoimboe@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     kasan-dev@...glegroups.com, Marco Elver <elver@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...e.de>,
        Miroslav Benes <mbenes@...e.cz>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sathvika Vasireddy <sv@...ux.ibm.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] objdump: add UACCESS exception for more stringops

From: Arnd Bergmann <arnd@...db.de>

The memset/memmove/memcpy string functions are wrapped in different
ways based on configuration. While the __asan_mem* functions already
have exceptions, the ones called from those do not:

mm/kasan/shadow.o: warning: objtool: __asan_memset+0x30: call to __memset() with UACCESS enabled
mm/kasan/shadow.o: warning: objtool: __asan_memmove+0x51: call to __memmove() with UACCESS enabled
mm/kasan/shadow.o: warning: objtool: __asan_memcpy+0x51: call to __memcpy() with UACCESS enabled
vmlinux.o: warning: objtool: .altinstr_replacement+0x1406: call to memcpy_erms() with UACCESS enabled
vmlinux.o: warning: objtool: .altinstr_replacement+0xed0: call to memset_erms() with UACCESS enabled
vmlinux.o: warning: objtool: memset+0x4: call to memset_orig() with UACCESS enabled
vmlinux.o: warning: objtool: memset+0x4: call to memset_orig() with UACCESS enabled

Add these to the list as well.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 tools/objtool/check.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 0f67c6a8bc98..e8fb3bf7a2e3 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1248,6 +1248,13 @@ static const char *uaccess_safe_builtin[] = {
 	"clear_user_erms",
 	"clear_user_rep_good",
 	"clear_user_original",
+	"__memset",
+	"__memcpy",
+	"__memmove",
+	"memset_erms",
+	"memcpy_erms",
+	"memset_orig",
+	"memcpy_orig",
 	NULL
 };
 
-- 
2.39.1