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kernel/svc: Sanitize addresses and sizes within svcMapMemory() and svcUnmapMemory()

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The kernel checks if the addresses and given size is 4KB aligned before
continuing onwards to map the memory.
This commit is contained in:
Lioncash 2018-09-13 19:14:50 -04:00
parent 7bd2faad9a
commit 496c67fd73
1 changed files with 23 additions and 0 deletions
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23
src/core/hle/kernel/svc.cpp
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@ -35,6 +35,11 @@
#include "core/hle/service/service.h"
namespace Kernel {
namespace {
constexpr bool Is4KBAligned(VAddr address) {
return (address & 0xFFF) == 0;
}
} // Anonymous namespace
/// Set the process heap to a given Size. It can both extend and shrink the heap.
static ResultCode SetHeapSize(VAddr* heap_addr, u64 heap_size) {
@ -62,6 +67,15 @@ static ResultCode SetMemoryAttribute(VAddr addr, u64 size, u32 state0, u32 state
static ResultCode MapMemory(VAddr dst_addr, VAddr src_addr, u64 size) {
LOG_TRACE(Kernel_SVC, "called, dst_addr=0x{:X}, src_addr=0x{:X}, size=0x{:X}", dst_addr,
src_addr, size);
if (!Is4KBAligned(dst_addr) || !Is4KBAligned(src_addr)) {
return ERR_INVALID_ADDRESS;
}
if (size == 0 || !Is4KBAligned(size)) {
return ERR_INVALID_SIZE;
}
return Core::CurrentProcess()->MirrorMemory(dst_addr, src_addr, size);
}
@ -69,6 +83,15 @@ static ResultCode MapMemory(VAddr dst_addr, VAddr src_addr, u64 size) {
static ResultCode UnmapMemory(VAddr dst_addr, VAddr src_addr, u64 size) {
LOG_TRACE(Kernel_SVC, "called, dst_addr=0x{:X}, src_addr=0x{:X}, size=0x{:X}", dst_addr,
src_addr, size);
if (!Is4KBAligned(dst_addr) || !Is4KBAligned(src_addr)) {
return ERR_INVALID_ADDRESS;
}
if (size == 0 || !Is4KBAligned(size)) {
return ERR_INVALID_SIZE;
}
return Core::CurrentProcess()->UnmapMemory(dst_addr, src_addr, size);
}