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VM: Fix vm_block_address_range() area protection 

B_ALREADY_WIRED, which was erroneously passed for the area protection
parameter to map_backing_store(), has the value 7 which implies user
readable and writable. Hence the address ranges around 0xdeadbeef and
0xcccccccc could actually be read and written from anywhere.
This commit is contained in:
Ingo Weinhold 2013-04-05 16:58:50 +02:00
parent ce577d8db0
commit d482342399
1 changed files with 2 additions and 2 deletions
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4
src/system/kernel/vm/vm.cpp
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@ -1005,8 +1005,8 @@ vm_block_address_range(const char* name, void* address, addr_t size)
addressRestrictions.address = address;
addressRestrictions.address_specification = B_EXACT_ADDRESS;
status = map_backing_store(addressSpace, cache, 0, name, size,
B_ALREADY_WIRED, B_ALREADY_WIRED, REGION_NO_PRIVATE_MAP, 0,
&addressRestrictions, true, &area, NULL);
B_ALREADY_WIRED, 0, REGION_NO_PRIVATE_MAP, 0, &addressRestrictions,
true, &area, NULL);
if (status != B_OK) {
cache->ReleaseRefAndUnlock();
return status;