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Line 90:
Line 90: − +
Not really exploitable so I threw it here.
When (u8*)0x10000000 bit 1 is set(which means this happens only when this loader runs again for firm-launch), the normalkey, keyX, and keyY, for keyslot 0x11 are cleared to zero.
When (u8*)0x10000000 bit 1 is set(which means this happens only when this loader runs again for firm-launch), the normalkey, keyX, and keyY, for keyslot 0x11 are cleared to zero.
It sets KeyY for keyslot 0x15(0x16 with [[9.5.0-22|9.5.0-X]]) to arm9_bin_buf+16, the CTR to arm9_bin_buf+32 (both are unique for every version). It then proceeds to decrypt the binary with AES-CTR. When done, it sets the normal-key for the keyslot used for binary decryption to zeros. It then decrypts arm9_bin_buf+64 using an hardcoded keyY for keyslot 0x15([[9.5.0-22|9.5.0-X]]/[[9.6.0-24|9.6.0-X]] also uses keyslot 0x15), sets the normal-key for this keyslot to zeros again, then makes sure the output block is all zeroes. If it is, it does some cleanup then it jumps to the entrypoint for the decrypted binary. Otherwise it will clear the keyX, keyY, and normal-key for each of the keyslots initialized by this loader, do cleanup(same cleanup as when the decrypted block is all-zero) then just loop forever.
It sets KeyY for keyslot 0x15(0x16 with [[9.5.0-22|9.5.0-X]]) to arm9_bin_buf+16, the CTR to arm9_bin_buf+32 (both are unique for every version). It then proceeds to decrypt the binary with AES-CTR. When done, it sets the normal-key for the keyslot used for binary decryption to zeros. It then decrypts arm9_bin_buf+64 using an hardcoded keyY for keyslot 0x15([[9.5.0-22|9.5.0-X]]/[[9.6.0-24|9.6.0-X]] also uses keyslot 0x15), sets the normal-key for this keyslot to zeros again, then makes sure the output block is all zeroes. If it is, it does some cleanup then it jumps to the entrypoint for the decrypted binary. Otherwise it will clear the keyX, keyY, and normal-key for each of the keyslots initialized by this loader (on [[9.6.0-24|9.6.0-X]]+, on older versions this was bugged and cleared keys 0x00..0x07 instead of 0x18..0x1F), do cleanup(same cleanup as when the decrypted block is all-zero) then just loop forever.
Thus, the ARM9 binary has the following header:
Thus, the ARM9 binary has the following header: