From: Zong Li <zong.li@xxxxxxxxxx> Subject: riscv: support DEBUG_WX Support DEBUG_WX to check whether there are mapping with write and execute permission at the same time. [akpm@xxxxxxxxxxxxxxxxxxxx: replace macros with C] Link: http://lkml.kernel.org/r/282e266311bced080bc6f7c255b92f87c1eb65d6.1587455584.git.zong.li@xxxxxxxxxx Signed-off-by: Zong Li <zong.li@xxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx> Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Will Deacon <will@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/riscv/Kconfig | 1 + arch/riscv/include/asm/ptdump.h | 11 +++++++++++ arch/riscv/mm/init.c | 3 +++ 3 files changed, 15 insertions(+) --- a/arch/riscv/include/asm/ptdump.h~riscv-support-debug_wx +++ a/arch/riscv/include/asm/ptdump.h @@ -8,4 +8,15 @@ void ptdump_check_wx(void); +#ifdef CONFIG_DEBUG_WX +static inline void debug_checkwx(void) +{ + ptdump_check_wx(); +} +#else +static inline void debug_checkwx(void) +{ +} +#endif + #endif /* _ASM_RISCV_PTDUMP_H */ --- a/arch/riscv/Kconfig~riscv-support-debug_wx +++ a/arch/riscv/Kconfig @@ -16,6 +16,7 @@ config RISCV select OF_EARLY_FLATTREE select OF_IRQ select ARCH_HAS_BINFMT_FLAT + select ARCH_HAS_DEBUG_WX select ARCH_WANT_FRAME_POINTERS select CLONE_BACKWARDS select COMMON_CLK --- a/arch/riscv/mm/init.c~riscv-support-debug_wx +++ a/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" @@ -514,6 +515,8 @@ 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 _
