linux-kernel - [PATCH v2 2/2] MIPS: Add writable-applies-readable policy with pgrot

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Date:   Sat,  6 Jun 2020 12:02:49 +0800
From:   Bibo Mao <maobibo@...ngson.cn>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Paul Burton <paulburton@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH v2 2/2] MIPS: Add writable-applies-readable policy with pgrot

On Linux system, writable applies readable privilege in most
architectures, this patch adds this policy on MIPS platform
where hardware rixi is supported.

Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
---
 arch/mips/mm/cache.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
index f814e43..dae0617 100644
--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c
@@ -160,7 +160,7 @@ static inline void setup_protection_map(void)
 	if (cpu_has_rixi) {
 		protection_map[0]  = __pgprot(__PC | __PP | __NX | __NR);
 		protection_map[1]  = __pgprot(__PC | __PP | __NX | ___R);
-		protection_map[2]  = __pgprot(__PC | __PP | __NX | __NR);
+		protection_map[2]  = __pgprot(__PC | __PP | __NX | ___R);
 		protection_map[3]  = __pgprot(__PC | __PP | __NX | ___R);
 		protection_map[4]  = __pgprot(__PC | __PP | ___R);
 		protection_map[5]  = __pgprot(__PC | __PP | ___R);
@@ -169,7 +169,7 @@ static inline void setup_protection_map(void)
 
 		protection_map[8]  = __pgprot(__PC | __PP | __NX | __NR);
 		protection_map[9]  = __pgprot(__PC | __PP | __NX | ___R);
-		protection_map[10] = __pgprot(__PC | __PP | __NX | ___W | __NR);
+		protection_map[10] = __pgprot(__PC | __PP | __NX | ___W | ___R);
 		protection_map[11] = __pgprot(__PC | __PP | __NX | ___W | ___R);
 		protection_map[12] = __pgprot(__PC | __PP | ___R);
 		protection_map[13] = __pgprot(__PC | __PP | ___R);
-- 
1.8.3.1