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Additional system information

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Giulio 2020-06-01 20:25:22 +02:00
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@ -321,3 +321,41 @@ Enter 'help' for a list of built-in commands.
/data/app/MAINAPP # id
uid=0(root) gid=999(MAINAPP) egid=0(root) groups=1(system),2(hwdev),999(MAINAPP),999(MAINAPP)
```
## System Analysis
The bootloader is U-Boot.
This is the partition scheme:
```
dev: size erasesize name
mtd0: 000c0000 00020000 "boot" <- U-Boot image
mtd1: 00080000 00020000 "nvram_fac" <- U-Boot environment
mtd2: 000c0000 00020000 "boot_res" <- Boot resources, ie: boot logo
mtd3: 00400000 00020000 "kernel" <- kernel binary
mtd4: 00600000 00020000 "ramdisk" <- ramdisk containit init and kernel modules
mtd5: 00600000 00020000 "base" <- base system, including binaries and libraries
mtd6: 06e00000 00020000 "data" <- user data, application executables, library and assets
```
The file [init.rc](https://git.lsd.cat/g/pax-pwn/src/master/firmware/tree/startup/init.rc) gives an idea on how the system is started and how different debug levels are handled.
`/usr/bin/tm` is the binary responsible for the GUI management. The system password is AES encrypted and is stored in a user readable property:
A lot of interesting functions are done trough kernel modules, [available here](https://git.lsd.cat/g/pax-pwn/src/master/firmware/tree/startup/modules).
Hardware driver are implemented via a low level kernel module and a higher level abastraction module, and are available via the `libosal.so` library.
In the case of this hardware revision of the S900, For the RFID reader:
```
pcd_rc663.ko -> Hardware driver
pcd_base.ko -> Middleware, creates
libosal.so -> Shared library, provides the OsPicc* functions trough interacting with /dev/pcd
```
For the magnetic stripe reader the family of functions is `OSMsr*` that uses the `/dev/msr` device and for SmartCards there are the `OsIcc*` functions that use the `/dev/usercard` device.
The graphic interface library is `libxui.so`.