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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 <rabin@rab.in>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Rabin Vincent 2010-03-20 02:28:03 +05:30 committed by Aurelien Jarno
parent ca5a2a4b12
commit 3ad493fc5e
1 changed files with 7 additions and 3 deletions
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10
target-arm/helper.c
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@ -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;
}