From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Nick Desaulniers <ndesaulniers@google.com>,
Linux Kernel Functional Testing <lkft@linaro.org>,
Kees Cook <keescook@chromium.org>,
Anders Roxell <anders.roxell@linaro.org>,
Shuah Khan <skhan@linuxfoundation.org>,
Sasha Levin <sashal@kernel.org>,
shuah@kernel.org, paul.walmsley@sifive.com, palmer@dabbelt.com,
aou@eecs.berkeley.edu, guoren@kernel.org, nathan@kernel.org,
linux-kselftest@vger.kernel.org, linux-riscv@lists.infradead.org,
linux-csky@vger.kernel.org, llvm@lists.linux.dev
Subject: [PATCH AUTOSEL 5.4 3/9] selftests: sigaltstack: fix -Wuninitialized
Date: Thu, 6 Apr 2023 07:33:31 -0400 [thread overview]
Message-ID: <20230406113337.648916-3-sashal@kernel.org> (raw)
In-Reply-To: <20230406113337.648916-1-sashal@kernel.org>
From: Nick Desaulniers <ndesaulniers@google.com>
[ Upstream commit 05107edc910135d27fe557267dc45be9630bf3dd ]
Building sigaltstack with clang via:
$ ARCH=x86 make LLVM=1 -C tools/testing/selftests/sigaltstack/
produces the following warning:
warning: variable 'sp' is uninitialized when used here [-Wuninitialized]
if (sp < (unsigned long)sstack ||
^~
Clang expects these to be declared at global scope; we've fixed this in
the kernel proper by using the macro `current_stack_pointer`. This is
defined in different headers for different target architectures, so just
create a new header that defines the arch-specific register names for
the stack pointer register, and define it for more targets (at least the
ones that support current_stack_pointer/ARCH_HAS_CURRENT_STACK_POINTER).
Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Link: https://lore.kernel.org/lkml/CA+G9fYsi3OOu7yCsMutpzKDnBMAzJBCPimBp86LhGBa0eCnEpA@mail.gmail.com/
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Tested-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../sigaltstack/current_stack_pointer.h | 23 +++++++++++++++++++
tools/testing/selftests/sigaltstack/sas.c | 7 +-----
2 files changed, 24 insertions(+), 6 deletions(-)
create mode 100644 tools/testing/selftests/sigaltstack/current_stack_pointer.h
diff --git a/tools/testing/selftests/sigaltstack/current_stack_pointer.h b/tools/testing/selftests/sigaltstack/current_stack_pointer.h
new file mode 100644
index 0000000000000..ea9bdf3a90b16
--- /dev/null
+++ b/tools/testing/selftests/sigaltstack/current_stack_pointer.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#if __alpha__
+register unsigned long sp asm("$30");
+#elif __arm__ || __aarch64__ || __csky__ || __m68k__ || __mips__ || __riscv
+register unsigned long sp asm("sp");
+#elif __i386__
+register unsigned long sp asm("esp");
+#elif __loongarch64
+register unsigned long sp asm("$sp");
+#elif __ppc__
+register unsigned long sp asm("r1");
+#elif __s390x__
+register unsigned long sp asm("%15");
+#elif __sh__
+register unsigned long sp asm("r15");
+#elif __x86_64__
+register unsigned long sp asm("rsp");
+#elif __XTENSA__
+register unsigned long sp asm("a1");
+#else
+#error "implement current_stack_pointer equivalent"
+#endif
diff --git a/tools/testing/selftests/sigaltstack/sas.c b/tools/testing/selftests/sigaltstack/sas.c
index ad0f8df2ca0af..6e60545994916 100644
--- a/tools/testing/selftests/sigaltstack/sas.c
+++ b/tools/testing/selftests/sigaltstack/sas.c
@@ -19,6 +19,7 @@
#include <errno.h>
#include "../kselftest.h"
+#include "current_stack_pointer.h"
#ifndef SS_AUTODISARM
#define SS_AUTODISARM (1U << 31)
@@ -40,12 +41,6 @@ void my_usr1(int sig, siginfo_t *si, void *u)
stack_t stk;
struct stk_data *p;
-#if __s390x__
- register unsigned long sp asm("%15");
-#else
- register unsigned long sp asm("sp");
-#endif
-
if (sp < (unsigned long)sstack ||
sp >= (unsigned long)sstack + SIGSTKSZ) {
ksft_exit_fail_msg("SP is not on sigaltstack\n");
--
2.39.2
parent reply other threads:[~2023-04-06 11:39 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20230406113337.648916-1-sashal@kernel.org>]
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