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Difference between revisions of "Device Nodes"
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(link to /dev) |
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These nodes can be read from or written to by the OS or applications. |
These nodes can be read from or written to by the OS or applications. |
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| + | See also [[/dev]]. |
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| + | |||
| + | ==Overview== |
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A iPhone 3G 2.0.2 contains: |
A iPhone 3G 2.0.2 contains: |
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crw-rw-rw- 1 root wheel 3, 3 Aug 28 15:35 zero |
crw-rw-rw- 1 root wheel 3, 3 Aug 28 15:35 zero |
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| + | ==Block Devices== |
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| − | |||
| − | =Block Devices= |
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{| border="1" cellpadding="20" cellspacing="0" |
{| border="1" cellpadding="20" cellspacing="0" |
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|disk0 |
|disk0 |
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| disk0s2 |
| disk0s2 |
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| User space. Stores Music, Photos, Videos, Podcasts, Ringtones and Apps. Mounted as /private/var. |
| User space. Stores Music, Photos, Videos, Podcasts, Ringtones and Apps. Mounted as /private/var. |
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| + | |- |
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| + | | disk1 |
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| + | | Unless you previously mounted something on purpose, this is going to be the DeveloperDiskImage from XCode, which is uploaded to your device and mounted every time you plug in with XCode running. It is signature checked against /System/Library/Lockdown/iPhoneDebug.pem. |
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| vn0 |
| vn0 |
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| − | =Interesting Character Devices= |
+ | ==Interesting Character Devices== |
{|border="1" cellpadding="20" cellspacing="0" |
{|border="1" cellpadding="20" cellspacing="0" |
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|Dev Node |
|Dev Node |
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| iPhone Baseband Radio |
| iPhone Baseband Radio |
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| dlci.spi-baseband.0 - dlci.spi-baseband.15 |
| dlci.spi-baseband.0 - dlci.spi-baseband.15 |
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| + | |- |
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| + | | tty.iap |
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| + | | serial connection (pins 12 and 13 of the Dock connector) |
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| uart.umts |
| uart.umts |
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| mem |
| mem |
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| − | | Raw access to RAM (has been blocked since 1. |
+ | | Raw access to RAM (has been blocked since 1.1.2) Memory devices can be re-enabled with single WORD change within kernel. |
| − | | kmem, Raw access to Kernel Memory (also blocked since 1. |
+ | | kmem, Raw access to Kernel Memory (also blocked since 1.1.2) |
| + | |- |
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| + | | aes_0 |
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| + | | Access to AES engine. Works via complicated ioctl handshake. Not known why it exists, as use of the IOKit interface is much simpler. |
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| + | |||
| + | ===How to access /dev/mem and /dev/kmem=== |
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| + | All you need to do is patch the kernel. See [http://code.google.com/p/chronicdev/wiki/GetBackMemAndKmem here] for up to date patches according to the firmware revision that you are on. Basically, the last one patches the setup_kmem flag itself, and the others just patch the checks to it. |
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Latest revision as of 13:30, 21 June 2011
The underlying unix OS that powers the iPhone has a number of device nodes. These nodes can be read from or written to by the OS or applications.
See also /dev.
Contents
Overview
A iPhone 3G 2.0.2 contains:
crw-rw-rw- 1 root wheel 21, 0 Aug 28 15:35 aes_0 crw------- 1 root wheel 23, 0 Aug 28 18:56 bpf0 crw------- 1 root wheel 23, 1 Aug 28 18:56 bpf1 crw------- 1 root wheel 23, 2 Aug 28 15:35 bpf2 crw------- 1 root wheel 23, 3 Aug 28 15:35 bpf3 c------r-- 1 root wheel 11, 0 Aug 28 15:35 btreset crw--w--w- 1 root wheel 0, 0 Aug 28 15:35 console crw-rw-rw- 1 root wheel 1, 5 Aug 28 18:56 cu.bluetooth crw-rw-rw- 1 root wheel 1, 7 Aug 28 15:35 cu.debug crw-rw-rw- 1 root wheel 1, 1 Aug 28 15:35 cu.iap crw-rw-rw- 1 root wheel 1, 3 Aug 28 15:35 cu.umts brw-r----- 1 root operator 14, 0 Aug 28 15:35 disk0 brw-r----- 1 root operator 14, 1 Aug 28 15:35 disk0s1 brw-r----- 1 root operator 14, 2 Aug 28 15:35 disk0s2 crw------- 1 root wheel 9, 0 Aug 28 15:35 dlci.spi-baseband.0 crw------- 1 root wheel 9, 1 Aug 28 18:56 dlci.spi-baseband.1 crw------- 1 root wheel 9, 10 Aug 28 15:35 dlci.spi-baseband.10 crw------- 1 root wheel 9, 11 Aug 28 15:35 dlci.spi-baseband.11 crw------- 1 root wheel 9, 12 Aug 28 15:35 dlci.spi-baseband.12 crw------- 1 root wheel 9, 13 Aug 28 15:35 dlci.spi-baseband.13 crw------- 1 root wheel 9, 14 Aug 28 15:35 dlci.spi-baseband.14 crw------- 1 root wheel 9, 15 Aug 28 15:35 dlci.spi-baseband.15 crw------- 1 root wheel 9, 2 Aug 28 19:13 dlci.spi-baseband.2 crw------- 1 root wheel 9, 3 Aug 28 18:56 dlci.spi-baseband.3 crw------- 1 root wheel 9, 4 Aug 28 18:56 dlci.spi-baseband.4 crw------- 1 root wheel 9, 5 Aug 28 18:56 dlci.spi-baseband.5 crw------- 1 root wheel 9, 6 Aug 28 18:56 dlci.spi-baseband.6 crw------- 1 root wheel 9, 7 Aug 28 18:56 dlci.spi-baseband.7 crw------- 1 root wheel 9, 8 Aug 28 18:56 dlci.spi-baseband.8 crw------- 1 root wheel 9, 9 Aug 28 18:56 dlci.spi-baseband.9 crw------- 1 root wheel 6, 0 Aug 28 15:35 klog cr--r--r-- 1 root wheel 13, 3 Aug 28 15:35 mrvl868x0 crw------- 1 root wheel 9, 0 Aug 28 15:35 mux.spi-baseband crw-rw-rw- 1 root wheel 3, 2 Aug 28 18:56 null crw-rw-rw- 1 root tty 15, 1 Aug 28 19:13 ptmx crw-rw-rw- 1 root wheel 5, 0 Aug 28 15:35 ptyp0 crw-rw-rw- 1 root wheel 5, 1 Aug 28 15:35 ptyp1 crw-rw-rw- 1 root wheel 5, 2 Aug 28 15:35 ptyp2 crw-rw-rw- 1 root wheel 5, 3 Aug 28 15:35 ptyp3 crw-rw-rw- 1 root wheel 5, 4 Aug 28 15:35 ptyp4 crw-rw-rw- 1 root wheel 5, 5 Aug 28 15:35 ptyp5 crw-rw-rw- 1 root wheel 5, 6 Aug 28 15:35 ptyp6 crw-rw-rw- 1 root wheel 5, 7 Aug 28 15:35 ptyp7 crw-rw-rw- 1 root wheel 8, 0 Aug 28 15:35 random crw-r----- 1 root operator 14, 0 Aug 28 15:35 rdisk0 crw-r----- 1 root operator 14, 1 Aug 28 15:35 rdisk0s1 crw-r----- 1 root operator 14, 2 Aug 28 15:35 rdisk0s2 crw-rw-rw- 1 root wheel 20, 0 Aug 28 15:35 sha1_0 crw-rw-rw- 1 root wheel 2, 0 Aug 28 15:35 tty crw-rw-rw- 1 root wheel 1, 4 Aug 28 15:35 tty.bluetooth crw-rw-rw- 1 root wheel 1, 6 Aug 28 15:35 tty.debug crw-rw-rw- 1 root wheel 1, 0 Aug 28 15:35 tty.iap crw-rw-rw- 1 root wheel 1, 2 Aug 28 15:35 tty.umts crw-rw-rw- 1 root wheel 4, 0 Aug 28 15:35 ttyp0 crw-rw-rw- 1 root wheel 4, 1 Aug 28 15:35 ttyp1 crw-rw-rw- 1 root wheel 4, 2 Aug 28 15:35 ttyp2 crw-rw-rw- 1 root wheel 4, 3 Aug 28 15:35 ttyp3 crw-rw-rw- 1 root wheel 4, 4 Aug 28 15:35 ttyp4 crw-rw-rw- 1 root wheel 4, 5 Aug 28 15:35 ttyp5 crw-rw-rw- 1 root wheel 4, 6 Aug 28 15:35 ttyp6 crw-rw-rw- 1 root wheel 4, 7 Aug 28 15:35 ttyp7 crw--w---- 1 root tty 16, 0 Aug 28 19:13 ttys000 crw-rw-rw- 1 root wheel 10, 2 Aug 28 15:35 uart.bluetooth crw-rw-rw- 1 root wheel 10, 3 Aug 28 15:35 uart.debug crw-rw-rw- 1 root wheel 10, 0 Aug 28 15:35 uart.iap crw-rw-rw- 1 root wheel 10, 1 Aug 28 15:35 uart.umts crw-rw-rw- 1 root wheel 8, 1 Aug 28 15:35 urandom brw------- 1 root operator 1, 0 Aug 28 15:35 vn0 brw------- 1 root operator 1, 1 Aug 28 15:35 vn1 crw-rw-rw- 1 root wheel 3, 3 Aug 28 15:35 zero
Block Devices
| disk0 | iPhone flash memory (4, 8 or 16GB) |
| disk0s1 | OS partition. Stores / root file system. |
| disk0s2 | User space. Stores Music, Photos, Videos, Podcasts, Ringtones and Apps. Mounted as /private/var. |
| disk1 | Unless you previously mounted something on purpose, this is going to be the DeveloperDiskImage from XCode, which is uploaded to your device and mounted every time you plug in with XCode running. It is signature checked against /System/Library/Lockdown/iPhoneDebug.pem. |
| vn0 | unknown |
| vn1 | unknown |
Interesting Character Devices
| Dev Node | Description | Children |
| rdisk0 | RAW Disk; to access the Flash | rdisk0s1 (root) rdisk0s2 (data) |
| dlci.spi-baseband | iPhone Baseband Radio | dlci.spi-baseband.0 - dlci.spi-baseband.15 |
| tty.iap | serial connection (pins 12 and 13 of the Dock connector) | |
| uart.umts | Serial connection to the Utms radio (?) | |
| dlci.spi-baseband.9 | GPS device (read from by /usr/libexec/locationd82 for CoreLocation services) | |
| mem | Raw access to RAM (has been blocked since 1.1.2) Memory devices can be re-enabled with single WORD change within kernel. | kmem, Raw access to Kernel Memory (also blocked since 1.1.2) |
| aes_0 | Access to AES engine. Works via complicated ioctl handshake. Not known why it exists, as use of the IOKit interface is much simpler. |
How to access /dev/mem and /dev/kmem
All you need to do is patch the kernel. See here for up to date patches according to the firmware revision that you are on. Basically, the last one patches the setup_kmem flag itself, and the others just patch the checks to it.
