Creport

Creport takes a string containing a pid (?) formatted in base10. This is launched by NS.

Then it uses the svcDebugActiveProcess to start a debug-session for the pid. It loops svcGetDebugEvent to fetch all debug events.

It has a event buffer of 128 u64's that starts with "CREP\x01\x00\x00\x00".

It only cares about type EXCEPTION and ATTACH_PROCESS events.

For ATTACH_PROCESS events it saves the title-id of the crashed process (this is the first u64 of the type-specific data), and a flag whether to dump stack.

For EXCEPTION events, it adds records to the buffer.

Each exception record starts with 2x u64's: exception type, and exception address.

Then depending on exception type it stores:

• UNDEFINED_INSTRUCTION (0): Always (u64) 0.
• PREFETCH_ABORT (1): Always (u64) 0.
• DATA_ABORT (2): (u64) Fault register.
• UNALIGNED_ACCESS (3): (u64) Fault register.
• UNDEFINED_SYSCALL (8): (u64) Syscall id.
• ? (9): Always (u64) 0.

For all exceptions, it then adds more data from svcGetDebugThreadParam/svcGetDebugThreadContext. This reads the flag from ATTACH_PROCESS to determine whether to read 0x10 bytes using svcReadDebugProcessMemory.

All other events (USER_BREAK, etc) don't store any extra data except type and address.

After it has fetched all events, if it didn't encounter USER_BREAK it constructs an error report:

• Field10: (String) Error-code string formatted with "%04d-%04d".
• Field115: (String) Title-id snprintf'ed as "%08llx".
• Field116: (Bool) 0.

It does *not* add the event buffer to the report if title-id is any of the following(swkbd and all web-applets except offline-applet):

• 0100000000001008
• 010000000000100A
• 010000000000100B
• 0100000000001010
• 0100000000001011

This is probably because of privacy concerns (software keyboard + browser could contain passwords and personal info).

For all other title-ids, it generates a random AES-128 key and iv using csrng.

It encrypts the entire event buffer with this AES key and iv. Then it encrypts the key-iv-pair using RSA-PSS with a hardcoded pubkey and exponent 0x10001.

These are added to the error report:

• Field206: (Raw) RSA-encrypted AES-key.
• Field207: (Raw) Encrypted crash-info.

Thus you need the private key to decrypt the crash dump.

Finally, the error report is sent to "erpt:c" cmd1.

It uses "ns:dev" to terminate the pid, and then it throws the following fatal-err depending on exception type

• 0 -> 0xA8
• 1 -> 0x2A8
• 2 -> 0x4A8,
• 3 -> 0x6A8,
• 6 -> No fatal-err
• 8 -> 0x10A8
• Default: 0x4A2