Cmep registers: Difference between revisions
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Toggle: Set to 1. | Toggle: Set to 1. | ||
Status: | Status: eMMC enc/dec enabled? | ||
== 0xE0070004: EmmcCrypto availability status == | == 0xE0070004: EmmcCrypto availability status == | ||
Revision as of 00:43, 14 February 2023
0xE0000000: Mailbox
The mailbox is used for communication between ARM TrustZone and Cmep (Second Loader and Secure Kernel), and with the debugger. Communication seems to go through some sort of FIFO register.
Messages
Messages are sent by Cmep to ARM TrustZone using the lower 16-bits at 0xE0000000. When ARM TrustZone has read it, the register is set to 0.
ARM TrustZone can write a 32-bit response to 0xE0000010. For ARM to Cmep, bit0 is used to indicate that the message has been written by ARM TrustZone.
1 = Request succeeded
4 = Debug string
0x101 = Main init started
0x102 = Sm can be loaded/resumed
0x103 = Sm resumed successfully
0x104 = Sm was shut down
0x106 = Main shutting down
0x107 = Suspend beginning
0x108 = Ready for suspending, when using the async version.
0x8016 = Error: Invalid address range
0x802F = Error: Failed to init E003, E006.
0xE0000000: MailboxCmepToArm
Response to ARM is written here. To read, get a double word from physical address 0xE0000000. If it returns 0, no data is available. Otherwise, acknowledge that the data has been read by ARM TrustZonr by putting the same data into 0xE0000000.
| Address | RW permissions | Use | Description |
|---|---|---|---|
| 0xE0000000 | RW | Status | Read for status. |
| 0xE0000004 | RW | Result | Cmep to ARM. 1: success. 3: command not found. 5: Invalid arguments. Used by SMC 0x12d, 0x136, 0x137, 0x13B, interrupt 0xC8. |
| 0xE0000008 | RW | ? | Used by SMC 0x12d, 0x136, 0x137, 0x13B, interrupt 0xC8. |
| 0xE000000C | RW | ? | Used by SMC 0x12d, 0x136, 0x137, 0x13B, interrupt 0xC8. |
0xE0000010: MailboxArmToCmep
Request from ARM is written here. To write, put the double word into physical address 0xE0000010. Next read 0xE0000010 until it returns 0, which indicates the data was read by Cmep.
| Address | RW permissions | Use | Description |
|---|---|---|---|
| 0xE0000010 | RW | Command | ARM to Cmep. Send a command to Cmep. |
| 0xE0000014 | RW | Arguments | ARM to Cmep. (PA & 1) == 1: valid arguments. See Executing Secure Module functions. |
| 0xE0000018 | RW | ? | See Executing Secure Module functions. |
| 0xE000001C | RW | ? | See Executing Secure Module functions. |
0xE0000020: MailboxCmepToDebugger
Size: 2 * DWORD.
0xE0000028: MailboxDebuggerToCmep
Size: 2 * DWORD.
0xE0000054: unknown
| Address | RW permissions | Use | Description |
|---|---|---|---|
| 0xE0000054 | RW | ? | Used by SMC 0x12d, 0x135, 0x13B, interrupt 0xC8. |
| 0xE0000058 | RW | ? | Used by SMC 0x12d, 0x135, 0x13B, interrupt 0xC8. |
| 0xE000005C | RW | ? | Used by SMC 0x12d, 0x135, 0x13B, interrupt 0xC8. |
0xE0000060: MailboxDebuggerToCmep2
Size: 2 * DWORD.
0xE0010000: Cmep controller
| Address | Length | Description |
|---|---|---|
| 0xE0010000 | 4 | TZ sets it to 1 then 0 and it appears cmep resets. |
| 0xE0010004 | 4 | Read by second_loader, checked against mask (& 5) and (& 8). Read by TZ after setting reset, checked if flag 0x80000000 is set. Ex: 0x80000005. Writing values to it from cmep does nothing. |
0xE0010000: CmepReset
0xE0010000: 00 00 00 00 05 00 00 80 00 00 00 00 00 00 00 00
Bit0: Hangs. ARM uses this to reset the cMeP subsystem. Used by Cmep command 0 to prepare Cmep to receive an address that contains the secure_kernel.enp. RW.
0xE0010004: CmepStatus
Bit31: IsCmepAlive Bit0-2: ?
Used by Cmep command 0 to check if the value written in 0xE0010000 is okay (it should return a value <= 0). Read allowed, maybe not write.
0xE0010010: Unknown
0xE0010010: 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Reads back 0x7FF. Then hangs after delay.
Bit5: Disables Key* registers, and Cmep KeyRings.
No bit appears to disable Rsa* registers, or Bigmac*.
0xE0020000: Cmep 0xE0020000
| Address | Length | Description |
|---|---|---|
| 0xE0020000 | 4 | second_loader sets it to 0x30003 after ?clearing keys?. secure_kernel sets it to 0x2000F. |
| 0xE0020004 | 4 | ? Error code ?. Read by second_loader, checked against 0x8000001F. Also set to ?0? by second_loader when setting 0x30003 at 0xE0020000. |
| 0xE0020020 | 4 | Checked for 0 by second_loader. May be a kind of timer or working state. |
| 0xE0020040 | 0x10 | Read As |
| 0xE0020100 | 0x20 | Per-console 256-bit key from keyring 0x602 is copied here by second_loader. |
0xE0020000 flags
Bit0: Reboot when cleared. Bit1: Makes first_loader load secure_kernel. Hang when cleared and unrecoverable. Bit2: No hang when cleared. Bit3: No hang when cleared. Bit4: ? Bit5: ? Bit16: Allows ARM to reset cmep. No hang when cleared. Bit17: ?
0xE0030000: Bigmac Keyring controller
This device is mapped to ScePervasiveResetReg at offset 0x190 for controlling reset and enabling mask writing.
typedef struct BigmacKeyringControllerRegs { // physical address 0xE0030000
SceUInt32 keyring_new_value[8];
SceUInt32 keyring_set_value_trigger;
SceUInt32 keyring_clear_flags;
SceUInt32 keyring_query_flags_request;
SceUInt32 keyring_query_flags_response;
} BigmacKeyringControllerRegs;
0xE0030000: KeyringNewValue
Size: 8 * DWORD.
0xE0030020: KeyringSetValueTrigger
Write value to a keyring. Requires the keyring to be enabled and WriteByCmepAllowed flag to be set.
Write a keyring to this address, and the Bigmac Keyring Controller will write value from physical address 0xE0030000 to the keyring.
0xE0030024: KeyringClearFlags
Note that there is no known way to set some keyrings flags in any way (doing keyring_flags |= or_flags), even though the opposite (clearing flags) is doable for some flags.
Writing ((flags_mask<<16)|keyring_id) to keyring_clear_flags clear flags for this keyring.
Bit0-15: KeyringId Bit16-31: KeyringClearFlagsMask
0xE0030028: KeyringQueryFlags
Writing keyring_id to keyring_query_flags_request returns current flags in keyring_query_flags_response.
Bit0-15: KeyringId
0xE003002C: KeyringQueryFlagsResponse
Bit Mask value Clearable Description 0 (0x0000 0001): N/A | KeyringExists 1 (0x0000 0002): N/A | KeyringEnabled. You cannot use the keyring if this is not set. 2 (0x0000 0004): N/A | Unknown 16 (0x0001 0000): Clearable | AesEncryptAllowed (CTR+CBC+ECB, any key size) 17 (0x0002 0000): Clearable | AesDecryptAllowed (CTR+CBC+ECB, any key size) 18 (0x0004 0000): Clearable | ShaHmacAllowed (SHA1+SHA256) 19 (0x0008 0000): Clearable | AesCmacAllowed 20 (0x0010 0000): Clearable | Master keyring can target memory. 21 (0x0020 0000): Fixed | IsMaster. Master keyring can target slave keyring (based on Mask Group below). 22 (0x0040 0000): Fixed | MemberOfGroup0. Keyring Pairing Lock Mask Group 0 (master keyrings 0x204-0x205 and slave keyrings 0-7). 23 (0x0080 0000): Fixed | MemberOfGroup1. Keyring Pairing Lock Mask Group 1 (master keyrings 0x206-0x20D and slave keyrings 8-0xF). 24 (0x0100 0000): Fixed | MemberOfGroup2. Keyring Pairing Lock Mask Group 2 (master keyrings 0x340-0x343 and slave keyrings 0x10-0x1F). 25 (0x0200 0000): Fixed | MemberOfGroup3. Keyring Pairing Lock Mask Group 3 (master keyrings 0x344-0x353 and slave keyrings 0x20-0x2F). 26 (0x0400 0000): Clearable | ?WriteByBigmacAllowed?. ?Locked keyring can target cmep memory.? 27 (0x0800 0000): Clearable | WriteByCmepAllowed. Can be written directly by cmep. 28 (0x1000 0000): Clearable | ReadByCmepAllowed. Can be read directly by cmep.
A normal keyring is a keyring that do not belong to any group (bit21-25 are all zeroes). It can be written by slaves of groups, and also by normal non-keyring operations. They can write to ?a normal keyring or to external memory?.
A master keyring can only write into a slave keyring belonging to the same group(s) as itself. A master keyring cannot write into a non-slave keyring or external memory.
A slave keyring can write to a normal keyring or to external memory, but not to a master keyring.
VULN!! If a keyring has AesDecryptAllowed flag, it is possible to encrypt arbitrary AES blocks without AesEncryptAllowed flag by using AES CTR mode.
SceBignum controller
0xE0040000
0x1000 config * 0x10 = 0x10000-bytes
Bigmac Crypto Controller
// base: 0xE0050000 (channel0), 0xE0050080 (channel1)
typedef struct BigmacOp {
const void *src;
union {
void *dst;
SceUInt32 dst_keyring_id;
};
SceSize len;
int func; // operation
SceUInt32 work_keyring_id;
void *iv;
void *next;
int ready; // Writing 1 here starts the operation.
int status;
int res; // Set when invalid keyring (0xFFF). Bit18: Set when keyring is not allowed to perform operation.
} BigmacOp;
When Keyring is set to src, only slots with the 0x1000 flag can be targeted. Selecting a slot that does not have 0x1000 will only read zeros.
0xE005000C: Bigmac crypto controller function
There is usage of higher bits in the commands that do not seem to have much affect. For the encryption examples, 0xC002000 is also set on the command upper bits.
Bits Mask Value Description
0~1 | 0x00000003 | Function index
2 | 0x00000004 | RNG
3~5 | 0x00000038 | Algorithm index
6 | 0x00000040 | DES (Probably)
7 | 0x00000080 | Using external key (A key placed at 0xE0050200 is used instead of the key in the keyring)
8~9 | 0x00000300 | Key size. 0x000: 64-bits, 0x100: 128-bits, 0x200: 192-bits, 0x300: 256-bits
10~11 | 0x00000C00 | Hash transform flags. 0x400: hashUpdate, 0x800: hashFinalize, 0xC00: probably a fusion of hashUpdate and hashFinalize?
12 | 0x00001000 | Unknown. Used by sceDmacMemcpy/sceDmacMemset.
13 | 0x00002000 | Unknown. Some common option.
14~23 | 0x00FFC000 | Unknown
24~25 | 0x03000000 | Some address callback. Used by sceDmacMemcpy/sceDmacMemset. If set, need to call sceKernelSysrootDisableAutoClockDownForDriver. Setting this bit with AES function triggers hang.
26~27 | 0x0C000000 | Unknown
28 | 0x10000000 | Is destination a keyring
29~31 | 0xE0000000 | Unknown
Functions list
function + RNG = bzero?
Index Real Value Description
0 | 0x00000000 | Memcpy (Also Bigmac too?)
1 | 0x00000001 | AesEncrypt
2 | 0x00000002 | AesDecrypt
3 | 0x00000003 | Secure Hash Algorithm
Algorithms list
Index Func Real Value Description
0 | 1 | 0x00000001 | AesEcbEncrypt
1 | 1 | 0x00000009 | AesCbcEncrypt
2 | 1 | 0x00000011 | AesCtrEncrypt (encrypt context)
3 | 1 | 0x00000019 | AesCbcEncrypt
4 | 1 | 0x00000021 | AesCtrEncrypt (encrypt context)
5 | 1 | 0x00000029 | AesEcbEncrypt
6 | 1 | 0x00000031 | AesEcbEncrypt
7 | 1 | 0x00000039 | Hang on Bigmac
0 | 2 | 0x00000002 | AesEcbDecrypt
1 | 2 | 0x0000000A | AesCbcDecrypt
2 | 2 | 0x00000012 | AesCtrDecrypt (decrypt context)
3 | 2 | 0x0000001A | AesCbcDecrypt
4 | 2 | 0x00000022 | AesCtrDecrypt (decrypt context)
5 | 2 | 0x0000002A | AesEcbDecrypt
6 | 2 | 0x00000032 | AesEcbDecrypt
7 | 2 | 0x0000003A | Hang on Bigmac
0 | 3 | 0x00000003 | SHA1
1 | 3 | 0x0000000B | SHA224
2 | 3 | 0x00000013 | SHA256
3 | 3 | 0x0000001B | !!! HANG !!!
4 | 3 | 0x00000023 | HmacSha1
5 | 3 | 0x0000002B | HmacSha224
6 | 3 | 0x00000033 | HmacSha256
7 | 3 | 0x0000003B | AesCmac/AES-CBC-MAC-64 (CMAC, OMAC1)
0 | RNG | 0x00000004 | RNG
1 | RNG | 0x0000000C | Memset (ch is written to MacDevice +0x104. On FW 3.60, the ch is seen at offset +0x34.)
2 | RNG | 0x00000014 | Memset
3 | RNG | 0x0000001C | Memset
4 | RNG | 0x00000024 | Memset
5 | RNG | 0x0000002C | Memset
6 | RNG | 0x00000034 | Memset
7 | RNG | 0x0000003C | Memset
DES algorithms
Unlike for Dmac5, DES is not supported for keyring Controller.
DES is DMAC only. If running on Bigmac, it triggered hang up. (is this true?)
If keysize is 128 or 192, DES is in fact 3DES.
If both DES and SHA bits are set, DES bit is ignored and SHA command is executed.
Algo Func Real Value Description
0 | 0 | 0x00000040 | Unknown
0 | 1 | 0x00000041 | DesEcbEncrypt
0 | 2 | 0x00000042 | DesEcbDecrypt
1 | 1 | 0x00000049 | DesCbcEncrypt
1 | 2 | 0x0000004A | DesCbcDecrypt
4 | 1 | 0x00000061 | Unknown. Hang up on bigmac. (DES + AesCtrEncrypt)
Key size algorithms
Algo Func Keysize Real Value Description
0 | 1 | 128 | 0x00000101 | Aes128EcbEncrypt
0 | 2 | 128 | 0x00000102 | Aes128EcbDecrypt
0 | 1 | 192 | 0x00000201 | Aes192EcbEncrypt
0 | 2 | 192 | 0x00000202 | Aes192EcbDecrypt
0 | 1 | 256 | 0x00000301 | Aes256EcbEncrypt
0 | 2 | 256 | 0x00000302 | Aes256EcbDecrypt
1 | 1 | 128 | 0x00000109 | Aes128CbcEncrypt
1 | 2 | 128 | 0x0000010A | Aes128CbcDecrypt
1 | 1 | 192 | 0x00000209 | Aes192CbcEncrypt
1 | 2 | 192 | 0x0000020A | Aes192CbcDecrypt
1 | 1 | 256 | 0x00000309 | Aes256CbcEncrypt
1 | 2 | 256 | 0x0000030A | Aes256CbcDecrypt
7 | 3 | 128 | 0x0000013B | Aes128Cmac/AES-CBC-MAC-128 (CMAC, OMAC1)
7 | 3 | 192 | 0x0000023B | Aes192Cmac/AES-CBC-MAC-192 (CMAC, OMAC1)
7 | 3 | 256 | 0x0000033B | Aes256Cmac/AES-CBC-MAC-256 (CMAC, OMAC1)
The following commands are known to be able to write keyrings:
* AesEcbEncrypt/Decrypt:
Size is rounded up to multiple of 4.
If size > 16, size = 16.
Read |size| bytes from |src| into HW state.
The remaining 16-|size| bytes of state *ARE KEPT FROM RESULT OF PREVIOUS AES OPERATION*.
VULN! This allows key recovery of all slave keyrings during boot.
The key written to keyring is always 16 bytes long, padded with 00's.
* AesCbcEncrypt/Decrypt: Size is rounded up to multiple of 4.
* AesCtrEncrypt/Decrypt: Size is rounded up to multiple of 4.
* AesCmac Puts the 16 byte hash into keyring.
Bytes 16-31 are *FORCED* 0.
* Sha1: Puts the 20 byte hash into keyring.
Bytes 20-31 are *FORCED* 0.
* Sha224: Puts the 28 byte hash into keyring.
Bytes 28-31 are *FORCED* 0.
* Sha256: Puts the 32 byte hash into keyring.
* HmacSha1 Probably same as Sha1.
* HmacSha256 Probably same as Sha256.
* Rng
AesCtrEncrypt when having a keyring dst, still reads from src.
VULN! Any SHA with length==0 produces an output of all zeroes!
0xE0050024: Status
Bit Mask Value Description 0 | 0x00000001 | Busy 15 | 0x00008000 | Some error status 16 | 0x00010000 | Some error status 17 | 0x00020000 | Some error status 18 | 0x00040000 | Not allowed operation
0xE005003C: Bigmac Rng
Reads a random value.
0xE0050100: Bigmac unknown 0x100 data
0xE0050200: Bigmac External Key
Size: 0x20 bytes
VULN! Allows partial overwrite. However when using keyring crypto, this key remains unaffected thus it cannot be used to recover keyring keys.
Bigmac Key Ring Base
See F00D Key Ring Base.
All keyrings flags are reset when CMeP is reset.
Keyrings lock list
Location Keyring Clear When
first_loader | 0xA | 0x1C1F | decrypt_enc_body
0x20 | 0x1C1F | update_slsk_metadata_keys
0x207 | 0x1C1F | remove_slsk_personalization
0x208~0x20D | 0x1C1F | update_slsk_metadata_keys
0x20F | 0x1C0F | Setting eMMC key
0x501 | 0x0800 | update_bigmac_key_0x501
0x700~0x7FF | 0x1000 | slsk_header_rsa_check
Any keyring | 0x1C1F | disable_bigmac_keys_by_header
second_loader | 0x20E | 0x1FEF | Setting eMMC key
secure_kernel | 0x8 | 0x1FFE | on tzs comm
0x2~ 0x7 | 0x1FFF | on tzs comm
0x9~ 0xF | 0x1FFF | on tzs comm
0x11~ 0x21 | 0x1FFF | on tzs comm
0x25~ 0x2F | 0x1FFF | on tzs comm
0x35~ 0x7F | 0x1FFF | on tzs comm
0x101~0x17F | 0x1FFF | on tzs comm
0x200~0x203 | 0x1FFF | on tzs comm
0x206~0x20D | 0x1FFF | on tzs comm
0x20E~0x20F | 0x1FEF | on tzs comm
0x210~0x211 | 0x1FFF | on tzs comm
0x214~0x215 | 0x1FFF | on tzs comm
0x217 | 0x1FFF | on tzs comm
0x300~0x33F | 0x1FFF | on tzs comm
0x341~0x344 | 0x1FFF | on tzs comm
0x349~0x3FF | 0x1FFF | on tzs comm
0x400~0x47F | 0x1FFF | on tzs comm
0x50E | 0x0800 | on tzs comm
0x51C~0x57F | 0x1FFF | on tzs comm
0x605~0x607 | 0x1FFF | on tzs comm
0x700~0x7FF | 0x1FFF | on tzs comm
0xE0058000: Bigmac KeyRings
Size: 0x10000 bytes.
0xE0070000: SceEmmcController
| Address | Length | Description |
|---|---|---|
| 0xE0070000 | 4 | Ex: 1. Set to 0, then 1 after writing to 0xE0070008. |
| 0xE0070008 | 4 | Set to 0x020E020F in second_loader. ?eMMC related? |
| 0xE007000C | 4 | Ex: 2. |
| 0xE0070014 | 4 | Set to 6 under some condition in second_loader. |
0xE0070000: EmmcCrypto Toggle/Status?
Toggle: Set to 1.
Status: eMMC enc/dec enabled?
0xE0070004: EmmcCrypto availability status
bit0 (& 1): Not available -> Second Loader throws error.
0xE0070008: EmmcCrypto keyset
Read value example: 0x20E and 0x20F (FW 1.69-3.740.011).
write only.
0xE007000C: Unknown
Read value example: 2
0xE00C0000
0xE00CC000: Unknown
Unknown. Read value example: 0x10006331
0xE00CC014: Unknown
Unknown. Read value example: 0x300000
0xE00CC070: Unknown
Unknown. Read value example: 1
0xE00CC078: Unknown
Unknown. Read value example: 0x300