From 3ad493fc5ea38c005670adc5933058a28ccabdd4 Mon Sep 17 00:00:00 2001 From: Rabin Vincent Date: Sat, 20 Mar 2010 02:28:03 +0530 Subject: [PATCH] target-arm: disable PAGE_EXEC for XN pages Don't set PAGE_EXEC for XN pages, to avoid a bypass of XN protection checking if the page is already in the TLB. Signed-off-by: Rabin Vincent Signed-off-by: Aurelien Jarno --- target-arm/helper.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/target-arm/helper.c b/target-arm/helper.c index 18e22b1afc..e092b2122e 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -979,6 +979,7 @@ static int get_phys_addr_v5(CPUState *env, uint32_t address, int access_type, /* Access permission fault. */ goto do_fault; } + *prot |= PAGE_EXEC; *phys_ptr = phys_addr; return 0; do_fault: @@ -1075,6 +1076,9 @@ static int get_phys_addr_v6(CPUState *env, uint32_t address, int access_type, /* Access permission fault. */ goto do_fault; } + if (!xn) { + *prot |= PAGE_EXEC; + } *phys_ptr = phys_addr; return 0; do_fault: @@ -1137,6 +1141,7 @@ static int get_phys_addr_mpu(CPUState *env, uint32_t address, int access_type, /* Bad permission. */ return 1; } + *prot |= PAGE_EXEC; return 0; } @@ -1152,7 +1157,7 @@ static inline int get_phys_addr(CPUState *env, uint32_t address, if ((env->cp15.c1_sys & 1) == 0) { /* MMU/MPU disabled. */ *phys_ptr = address; - *prot = PAGE_READ | PAGE_WRITE; + *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; *page_size = TARGET_PAGE_SIZE; return 0; } else if (arm_feature(env, ARM_FEATURE_MPU)) { @@ -1183,8 +1188,7 @@ int cpu_arm_handle_mmu_fault (CPUState *env, target_ulong address, /* Map a single [sub]page. */ phys_addr &= ~(uint32_t)0x3ff; address &= ~(uint32_t)0x3ff; - tlb_set_page (env, address, phys_addr, prot | PAGE_EXEC, mmu_idx, - page_size); + tlb_set_page (env, address, phys_addr, prot, mmu_idx, page_size); return 0; } -- 2.11.4.GIT