linux-kernel - [PATCH v2] stack: Declare {randomize_,}kstack

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Date:   Wed, 29 Jun 2022 14:04:23 +0800
From:   "GONG, Ruiqi" <gongruiqi1@...wei.com>
To:     Kees Cook <keescook@...omium.org>, Marco Elver <elver@...gle.com>
CC:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Xiu Jianfeng <xiujianfeng@...wei.com>,
        <kernel-hardening@...ts.openwall.com>,
        <linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
        Gong Ruiqi <gongruiqi1@...wei.com>
Subject: [PATCH v2] stack: Declare {randomize_,}kstack_offset to fix Sparse warnings

Fix the following Sparse warnings that got noticed when the PPC-dev
patchwork was checking another patch (see the link below):

init/main.c:862:1: warning: symbol 'randomize_kstack_offset' was not declared. Should it be static?
init/main.c:864:1: warning: symbol 'kstack_offset' was not declared. Should it be static?

Which in fact are triggered on all architectures that have
HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET support (for instances x86, arm64
etc).

Link: https://lore.kernel.org/lkml/e7b0d68b-914d-7283-827c-101988923929@huawei.com/T/#m49b2d4490121445ce4bf7653500aba59eefcb67f
Cc: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: Xiu Jianfeng <xiujianfeng@...wei.com>
Signed-off-by: GONG, Ruiqi <gongruiqi1@...wei.com>
---

v2: remove unnecessary #ifdef around the header

 init/main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/init/main.c b/init/main.c
index e2490387db2b..eb9bf7c5b28b 100644
--- a/init/main.c
+++ b/init/main.c
@@ -99,6 +99,7 @@
 #include <linux/kcsan.h>
 #include <linux/init_syscalls.h>
 #include <linux/stackdepot.h>
+#include <linux/randomize_kstack.h>
 #include <net/net_namespace.h>
 
 #include <asm/io.h>
-- 
2.25.1