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disallow mapping memory range that is already mapped. this fixes issue #350

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Nguyen Anh Quynh 2015-12-30 09:17:47 +08:00
parent 6e534417f1
commit 7e16f7a50d
1 changed files with 29 additions and 0 deletions
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29
uc.c
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@ -577,6 +577,30 @@ static uc_err _hook_mem_access(uc_engine *uc, uc_hook_type type,
return UC_ERR_OK;
}
// find if a memory range overlaps with existing mapped regions
static bool memory_overlap(struct uc_struct *uc, uint64_t begin, size_t size)
{
unsigned int i;
uint64_t end = begin + size - 1;
for(i = 0; i < uc->mapped_block_count; i++) {
// begin address falls inside this region?
if (begin >= uc->mapped_blocks[i]->addr && begin <= uc->mapped_blocks[i]->end - 1)
return true;
// end address falls inside this region?
if (end >= uc->mapped_blocks[i]->addr && end <= uc->mapped_blocks[i]->end - 1)
return true;
// this region falls totally inside this range?
if (begin < uc->mapped_blocks[i]->addr && end > uc->mapped_blocks[i]->end - 1)
return true;
}
// not found
return false;
}
// common setup/error checking shared between uc_mem_map and uc_mem_map_ptr
static uc_err mem_map(uc_engine *uc, uint64_t address, size_t size, uint32_t perms, MemoryRegion *block)
{
@ -602,6 +626,10 @@ static uc_err mem_map(uc_engine *uc, uint64_t address, size_t size, uint32_t per
if ((perms & ~UC_PROT_ALL) != 0)
return UC_ERR_ARG;
// this area overlaps existing mapped regions?
if (memory_overlap(uc, address, size))
return UC_ERR_MAP;
if (block == NULL)
return UC_ERR_NOMEM;
@ -860,6 +888,7 @@ uc_err uc_mem_unmap(struct uc_struct *uc, uint64_t address, size_t size)
return UC_ERR_OK;
}
// find the memory region of this address
MemoryRegion *memory_mapping(struct uc_struct* uc, uint64_t address)
{
unsigned int i;