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kernel/svc: Sanitize creation of shared memory via svcCreateSharedMemory() 

The kernel caps the size limit of shared memory to 8589930496 bytes (or
(1GB - 512 bytes) * 8), so approximately 8GB, where every GB has a 512
byte sector taken off of it.

It also ensures the shared memory is created with either read or
read/write permissions for both permission types passed in, allowing the
remote permissions to also be set as "don't care".
This commit is contained in:
Lioncash 2018-09-13 21:04:43 -04:00
parent accd1f17e4
commit 4f8756edd0
1 changed files with 18 additions and 2 deletions
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20
src/core/hle/kernel/svc.cpp
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@ -935,12 +935,28 @@ static ResultCode CreateSharedMemory(Handle* handle, u64 size, u32 local_permiss
LOG_TRACE(Kernel_SVC, "called, size=0x{:X}, localPerms=0x{:08X}, remotePerms=0x{:08X}", size, LOG_TRACE(Kernel_SVC, "called, size=0x{:X}, localPerms=0x{:08X}, remotePerms=0x{:08X}", size,
local_permissions, remote_permissions); local_permissions, remote_permissions);
// Size must be a multiple of 4KB and be less than or equal to
// approx. 8 GB (actually (1GB - 512B) * 8)
if (size == 0 || (size & 0xFFFFFFFE00000FFF) != 0) {
return ERR_INVALID_SIZE;
}
const auto local_perms = static_cast<MemoryPermission>(local_permissions);
if (local_perms != MemoryPermission::Read && local_perms != MemoryPermission::ReadWrite) {
return ERR_INVALID_MEMORY_PERMISSIONS;
}
const auto remote_perms = static_cast<MemoryPermission>(remote_permissions);
if (remote_perms != MemoryPermission::Read && remote_perms != MemoryPermission::ReadWrite &&
remote_perms != MemoryPermission::DontCare) {
return ERR_INVALID_MEMORY_PERMISSIONS;
}
auto& kernel = Core::System::GetInstance().Kernel(); auto& kernel = Core::System::GetInstance().Kernel();
auto& handle_table = kernel.HandleTable(); auto& handle_table = kernel.HandleTable();
auto shared_mem_handle = auto shared_mem_handle =
SharedMemory::Create(kernel, handle_table.Get<Process>(KernelHandle::CurrentProcess), size, SharedMemory::Create(kernel, handle_table.Get<Process>(KernelHandle::CurrentProcess), size,
static_cast<MemoryPermission>(local_permissions), local_perms, remote_perms);
static_cast<MemoryPermission>(remote_permissions));
CASCADE_RESULT(*handle, handle_table.Create(shared_mem_handle)); CASCADE_RESULT(*handle, handle_table.Create(shared_mem_handle));
return RESULT_SUCCESS; return RESULT_SUCCESS;