linux-kernel - [PATCH 5.7 215/376] MIPS: Fix exception handler memcpy()

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Date:   Fri, 19 Jun 2020 16:32:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ben Hutchings <ben@...adent.org.uk>,
        YunQiang Su <syq@...ian.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.7 215/376] MIPS: Fix exception handler memcpy()

From: Ben Hutchings <ben@...adent.org.uk>

[ Upstream commit f39293fd37fff74c531b7a52d0459cc77db85e7f ]

The exception handler subroutines are declared as a single char, but
when copied to the required addresses the copy length is 0x80.

When range checks are enabled for memcpy() this results in a build
failure, with error messages such as:

In file included from arch/mips/mti-malta/malta-init.c:15:
In function 'memcpy',
    inlined from 'mips_nmi_setup' at arch/mips/mti-malta/malta-init.c:98:2:
include/linux/string.h:376:4: error: call to '__read_overflow2' declared with attribute error: detected read beyond size of object passed as 2nd parameter
  376 |    __read_overflow2();
      |    ^~~~~~~~~~~~~~~~~~

Change the declarations to use type char[].

Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Signed-off-by: YunQiang Su <syq@...ian.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/mips/loongson2ef/common/init.c | 4 ++--
 arch/mips/loongson64/init.c         | 4 ++--
 arch/mips/mti-malta/malta-init.c    | 8 ++++----
 arch/mips/pistachio/init.c          | 8 ++++----
 4 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/arch/mips/loongson2ef/common/init.c b/arch/mips/loongson2ef/common/init.c
index 45512178be77..ce3f02f75e2a 100644
--- a/arch/mips/loongson2ef/common/init.c
+++ b/arch/mips/loongson2ef/common/init.c
@@ -19,10 +19,10 @@ unsigned long __maybe_unused _loongson_addrwincfg_base;
 static void __init mips_nmi_setup(void)
 {
 	void *base;
-	extern char except_vec_nmi;
+	extern char except_vec_nmi[];
 
 	base = (void *)(CAC_BASE + 0x380);
-	memcpy(base, &except_vec_nmi, 0x80);
+	memcpy(base, except_vec_nmi, 0x80);
 	flush_icache_range((unsigned long)base, (unsigned long)base + 0x80);
 }
 
diff --git a/arch/mips/loongson64/init.c b/arch/mips/loongson64/init.c
index da38944471f4..86c5e93258ce 100644
--- a/arch/mips/loongson64/init.c
+++ b/arch/mips/loongson64/init.c
@@ -17,10 +17,10 @@
 static void __init mips_nmi_setup(void)
 {
 	void *base;
-	extern char except_vec_nmi;
+	extern char except_vec_nmi[];
 
 	base = (void *)(CAC_BASE + 0x380);
-	memcpy(base, &except_vec_nmi, 0x80);
+	memcpy(base, except_vec_nmi, 0x80);
 	flush_icache_range((unsigned long)base, (unsigned long)base + 0x80);
 }
 
diff --git a/arch/mips/mti-malta/malta-init.c b/arch/mips/mti-malta/malta-init.c
index ff2c1d809538..893af377aacc 100644
--- a/arch/mips/mti-malta/malta-init.c
+++ b/arch/mips/mti-malta/malta-init.c
@@ -90,24 +90,24 @@ static void __init console_config(void)
 static void __init mips_nmi_setup(void)
 {
 	void *base;
-	extern char except_vec_nmi;
+	extern char except_vec_nmi[];
 
 	base = cpu_has_veic ?
 		(void *)(CAC_BASE + 0xa80) :
 		(void *)(CAC_BASE + 0x380);
-	memcpy(base, &except_vec_nmi, 0x80);
+	memcpy(base, except_vec_nmi, 0x80);
 	flush_icache_range((unsigned long)base, (unsigned long)base + 0x80);
 }
 
 static void __init mips_ejtag_setup(void)
 {
 	void *base;
-	extern char except_vec_ejtag_debug;
+	extern char except_vec_ejtag_debug[];
 
 	base = cpu_has_veic ?
 		(void *)(CAC_BASE + 0xa00) :
 		(void *)(CAC_BASE + 0x300);
-	memcpy(base, &except_vec_ejtag_debug, 0x80);
+	memcpy(base, except_vec_ejtag_debug, 0x80);
 	flush_icache_range((unsigned long)base, (unsigned long)base + 0x80);
 }
 
diff --git a/arch/mips/pistachio/init.c b/arch/mips/pistachio/init.c
index a09a5da38e6b..558995ed6fe8 100644
--- a/arch/mips/pistachio/init.c
+++ b/arch/mips/pistachio/init.c
@@ -83,12 +83,12 @@ phys_addr_t mips_cdmm_phys_base(void)
 static void __init mips_nmi_setup(void)
 {
 	void *base;
-	extern char except_vec_nmi;
+	extern char except_vec_nmi[];
 
 	base = cpu_has_veic ?
 		(void *)(CAC_BASE + 0xa80) :
 		(void *)(CAC_BASE + 0x380);
-	memcpy(base, &except_vec_nmi, 0x80);
+	memcpy(base, except_vec_nmi, 0x80);
 	flush_icache_range((unsigned long)base,
 			   (unsigned long)base + 0x80);
 }
@@ -96,12 +96,12 @@ static void __init mips_nmi_setup(void)
 static void __init mips_ejtag_setup(void)
 {
 	void *base;
-	extern char except_vec_ejtag_debug;
+	extern char except_vec_ejtag_debug[];
 
 	base = cpu_has_veic ?
 		(void *)(CAC_BASE + 0xa00) :
 		(void *)(CAC_BASE + 0x300);
-	memcpy(base, &except_vec_ejtag_debug, 0x80);
+	memcpy(base, except_vec_ejtag_debug, 0x80);
 	flush_icache_range((unsigned long)base,
 			   (unsigned long)base + 0x80);
 }
-- 
2.25.1