linux-kernel - [PATCH 4/4] objtool: add UACCESS exceptions for __tsan_volatile

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Date:   Wed,  8 Feb 2023 17:39:58 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Josh Poimboeuf <jpoimboe@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...e.de>, Marco Elver <elver@...gle.com>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     kasan-dev@...glegroups.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>, Miroslav Benes <mbenes@...e.cz>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Sathvika Vasireddy <sv@...ux.ibm.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] objtool: add UACCESS exceptions for __tsan_volatile_read/write

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

A lot of the tsan helpers are already excempt from the UACCESS warnings,
but some more functions were added that need the same thing:

kernel/kcsan/core.o: warning: objtool: __tsan_volatile_read16+0x0: call to __tsan_unaligned_read16() with UACCESS enabled
kernel/kcsan/core.o: warning: objtool: __tsan_volatile_write16+0x0: call to __tsan_unaligned_write16() with UACCESS enabled
vmlinux.o: warning: objtool: __tsan_unaligned_volatile_read16+0x4: call to __tsan_unaligned_read16() with UACCESS enabled
vmlinux.o: warning: objtool: __tsan_unaligned_volatile_write16+0x4: call to __tsan_unaligned_write16() with UACCESS enabled

Fixes: 75d75b7a4d54 ("kcsan: Support distinguishing volatile accesses")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 tools/objtool/check.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index e8fb3bf7a2e3..d89ef6957021 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1200,6 +1200,8 @@ static const char *uaccess_safe_builtin[] = {
 	"__tsan_atomic64_compare_exchange_val",
 	"__tsan_atomic_thread_fence",
 	"__tsan_atomic_signal_fence",
+	"__tsan_unaligned_read16",
+	"__tsan_unaligned_write16",
 	/* KCOV */
 	"write_comp_data",
 	"check_kcov_mode",
-- 
2.39.1