Changes

57 functions were updated, at least 48 of these are the actual functions used for handling SVCs. The  lone function updated with v10.4 was updated with this version again.

57 functions were updated, at least 48 of these are the actual functions used for handling SVCs. The  lone function updated with v10.4 was updated with this version again.

3 new functions used for validation with memory management were added (kernelpanic() on failure). This is a new security feature for the kernel heaps. By adding a MAC to the kernel heap [[Memory_Management#MemoryBlockHeader|memchunkhdr]] they can detect when it is modified by an outside DMA device.

3 new functions used for validation with memory management were added (kernelpanic() on failure). This is a new security feature for the kernel heaps. By adding a MAC to the kernel heap [[Memory_Management#MemoryBlockHeader|memchunkhdr]] they can detect when it is modified by an outside DMA device ([[3DS_System_Flaws|gspwn]]).

The function which initializes a memalloc heap had a major update (used for FCRAM memregions and the SlabHeap container). It is unknown precisely what this does, but presumably it generates a random MAC key based on svcGetSystemTick.

The function which initializes a memalloc heap had a major update (used for FCRAM memregions and the SlabHeap container). It is unknown precisely what this does, but presumably it generates a random MAC key based on svcGetSystemTick.

  u32* crypto_state = (u32*) r4; // Safe kernel memory.

  u32* crypto_state = (u32*) r4; // Safe kernel memory.

  u32* data_ptr = (u32*) lr; // Unsafe FCRAM pointer.

  u32* data_ptr = (u32*) lr; // Unsafe FCRAM pointer.

 

  r0 = crypto_state[16/4] // Load "key".

  r0 = crypto_state[16/4] // Load "key".

  r1 = crypto_state[20/4]

  r1 = crypto_state[20/4]