CODEWITHSUNDEEP
linuxprocess
sholsapp
sholsapp

Reputation: 16070

Setting memory permissions in forked process

My goal is to set virtual memory page permissions (as if the forked process called mprotect) from the parent process. Can this be done with ptrace(1) or by some other magic?

Thanks!

Upvotes: 1

Views: 415

Answers (1)

Dan Fego
Dan Fego

Reputation: 14004

It can be done (via ptrace() indeed; gdb can do this), but not without a lot of finagling, since in order to call a function in another process, you basically have to setup its registers and stack, etc. for execution, and then continue the process, which will execute the function. One program I know off the top of my head that might have some useful source/methodology for you to look at is injectso. If you do look at injectso, look at the inject_code() functions.

In addition, calling conventions vary by platform, so you'd have to re-jigger your code for each architecture/OS, etc.

Upvotes: 3

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