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Message-ID: <1464088597-8820-1-git-send-email-thunder.leizhen@huawei.com> Date: Tue, 24 May 2016 19:16:37 +0800 From: Zhen Lei <thunder.leizhen@...wei.com> To: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will.deacon@....com>, linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>, linux-kernel <linux-kernel@...r.kernel.org> CC: Zefan Li <lizefan@...wei.com>, Xinwei Hu <huxinwei@...wei.com>, "Tianhong Ding" <dingtianhong@...wei.com>, Hanjun Guo <guohanjun@...wei.com>, Zhen Lei <thunder.leizhen@...wei.com> Subject: [PATCH 1/1] arm64: fix flush_cache_range When we ran mprotect04(a test case in LTP) infinitely, it would always failed after a few seconds. The case can be described briefly that: copy a empty function from code area into a new memory area(created by mmap), then call mprotect to change the protection to PROT_EXEC. The syscall sys_mprotect will finally invoke flush_cache_range, but this function currently only invalid icache, the operation of flush dcache is missed. Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com> --- arch/arm64/mm/flush.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c index dbd12ea..eda4124 100644 --- a/arch/arm64/mm/flush.c +++ b/arch/arm64/mm/flush.c @@ -31,7 +31,7 @@ void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) { if (vma->vm_flags & VM_EXEC) - __flush_icache_all(); + flush_icache_range(start, end); } static void sync_icache_aliases(void *kaddr, unsigned long len) -- 2.5.0
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