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Date:   Fri, 18 Jun 2021 22:01:36 +0800
From:   Jisheng Zhang <jszhang3@mail.ustc.edu.cn>
To:     Andrey Ryabinin <ryabinin.a.a@gmail.com>,
        Alexander Potapenko <glider@google.com>,
        Andrey Konovalov <andreyknvl@gmail.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Alexandre Ghiti <alex@ghiti.fr>
Cc:     kasan-dev@googlegroups.com, linux-riscv@lists.infradead.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH] riscv: kasan: Fix MODULES_VADDR evaluation due to local
 variables' name
Message-ID: <20210618220136.21f32b98@xhacker>
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From: Jisheng Zhang <jszhang@kernel.org>

commit 2bfc6cd81bd1 ("riscv: Move kernel mapping outside of linear
mapping") makes use of MODULES_VADDR to populate kernel, BPF, modules
mapping. Currently, MODULES_VADDR is defined as below for RV64:

| #define MODULES_VADDR   (PFN_ALIGN((unsigned long)&_end) - SZ_2G)

But kasan_init() has two local variables which are also named as _start,
_end, so MODULES_VADDR is evaluated with the local variable _end
rather than the global "_end" as we expected. Fix this issue by
renaming the two local variables.

Fixes: 2bfc6cd81bd1 ("riscv: Move kernel mapping outside of linear mapping")
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
---
 arch/riscv/mm/kasan_init.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c
index 55c113345460..d7189c8714a9 100644
--- a/arch/riscv/mm/kasan_init.c
+++ b/arch/riscv/mm/kasan_init.c
@@ -169,7 +169,7 @@ static void __init kasan_shallow_populate(void *start, void *end)
 
 void __init kasan_init(void)
 {
-	phys_addr_t _start, _end;
+	phys_addr_t p_start, p_end;
 	u64 i;
 
 	/*
@@ -189,9 +189,9 @@ void __init kasan_init(void)
 			(void *)kasan_mem_to_shadow((void *)VMALLOC_END));
 
 	/* Populate the linear mapping */
-	for_each_mem_range(i, &_start, &_end) {
-		void *start = (void *)__va(_start);
-		void *end = (void *)__va(_end);
+	for_each_mem_range(i, &p_start, &p_end) {
+		void *start = (void *)__va(p_start);
+		void *end = (void *)__va(p_end);
 
 		if (start >= end)
 			break;
-- 
2.32.0