By Nikolay Elenkov
In Android defense Internals, best Android safety specialist Nikolay Elenkov takes us less than the hood of the Android safeguard approach. Elenkov describes Android safety structure from the ground up, delving into the implementation of significant security-related elements and subsystems, like Binder IPC, permissions, cryptographic prone, and gadget administration.
How Android permissions are declared, used, and enforced
How Android manages software applications and employs code signing to ensure their authenticity
How Android implements the Java Cryptography structure (JCA) and Java safe Socket Extension (JSSE) frameworks
About Android's credential garage process and APIs, which enable functions shop cryptographic keys securely
About the net account administration framework and the way Google money owed combine with Android
About the implementation of proven boot, disk encryption, lockscreen, and different equipment defense features
How Android's bootloader and restoration OS are used to accomplish complete procedure updates, and the way to acquire root access
Read or Download Android Security Internals PDF
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Extra info for Android Security Internals
After I/O starts, control returns to user program without waiting for I/O completion. ✦ System call – request to the operating system to allow user to wait for I/O completion. ✦ Device-status table contains entry for each I/O device indicating its type, address, and state. ✦ Operating system indexes into I/O device table to determine device status and to modify table entry to include interrupt. 9 Silberschatz, Galvin and Gagne 2002 Direct Memory Access Structure ■ Used for high-speed I/O devices able to transmit information at close to memory speeds.
2 Silberschatz, Galvin and Gagne 2002 Computer-System Operation ■ I/O devices and the CPU can execute concurrently. ■ Each device controller is in charge of a particular device ■ ■ ■ ■ type. Each device controller has a local buffer. CPU moves data from/to main memory to/from local buffers I/O is from the device to local buffer of controller. Device controller informs CPU that it has finished its operation by causing an interrupt. 3 Silberschatz, Galvin and Gagne 2002 Common Functions of Interrupts ■ Interrupt transfers control to the interrupt service routine ■ ■ ■ ■ generally, through the interrupt vector, which contains the addresses of all the service routines.
An operating system is interrupt driven. 4 Silberschatz, Galvin and Gagne 2002 Interrupt Handling ■ The operating system preserves the state of the CPU by storing registers and the program counter. 6 Silberschatz, Galvin and Gagne 2002 I/O Structure ■ After I/O starts, control returns to user program only upon I/O completion. ✦ Wait instruction idles the CPU until the next interrupt ✦ Wait loop (contention for memory access). ✦ At most one I/O request is outstanding at a time, no simultaneous I/O processing.
Android Security Internals by Nikolay Elenkov