linux-kernel - [PATCH 2/4] riscv: support DEBUG

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Date:   Tue, 21 Apr 2020 16:17:13 +0800
From:   Zong Li <zong.li@...ive.com>
To:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, paul.walmsley@...ive.com,
        palmer@...belt.com, linux-riscv@...ts.infradead.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org,
        hpa@...or.com, catalin.marinas@....com, will@...nel.org,
        linux-arm-kernel@...ts.infradead.org
Cc:     Zong Li <zong.li@...ive.com>
Subject: [PATCH 2/4] riscv: support DEBUG_WX

Support DEBUG_WX to check whether there are mapping with write and
execute permission at the same time.

Signed-off-by: Zong Li <zong.li@...ive.com>
---
 arch/riscv/Kconfig              | 1 +
 arch/riscv/include/asm/ptdump.h | 6 ++++++
 arch/riscv/mm/init.c            | 3 +++
 3 files changed, 10 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 62f7bfeb709e..612bf0a258d0 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -68,6 +68,7 @@ config RISCV
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select HAVE_COPY_THREAD_TLS
 	select HAVE_ARCH_KASAN if MMU && 64BIT
+	select ARCH_HAS_DEBUG_WX
 
 config ARCH_MMAP_RND_BITS_MIN
 	default 18 if 64BIT
diff --git a/arch/riscv/include/asm/ptdump.h b/arch/riscv/include/asm/ptdump.h
index e29af7191909..eb2a1cc5f22c 100644
--- a/arch/riscv/include/asm/ptdump.h
+++ b/arch/riscv/include/asm/ptdump.h
@@ -8,4 +8,10 @@
 
 void ptdump_check_wx(void);
 
+#ifdef CONFIG_DEBUG_WX
+#define debug_checkwx() ptdump_check_wx()
+#else
+#define debug_checkwx() do { } while (0)
+#endif
+
 #endif /* _ASM_RISCV_PTDUMP_H */
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index b55be44ff9bd..86606e4d1860 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -19,6 +19,7 @@
 #include <asm/sections.h>
 #include <asm/pgtable.h>
 #include <asm/io.h>
+#include <asm/ptdump.h>
 
 #include "../kernel/head.h"
 
@@ -529,6 +530,8 @@ void mark_rodata_ro(void)
 	set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
 	set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
 	set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT);
+
+	debug_checkwx();
 }
 #endif
 
-- 
2.26.1