CODEWITHSUNDEEP
linux-kernelembedded-linuxkernel-module
fghoussen
fghoussen

Reputation: 565

Can a Linux Kernel Module read safely a user space command (i.e. user buffer)?

Can a Linux Kernel Module read safely a user space command (i.e. user buffer)?

I know kernel and user space are different: user memory can not be executed from kernel space and vice-versa.

I wrote some simple LKM where commands coming from user space where simple: there, you can just copy the user buffer (command) to a kernel buffer using copy_from_user.

Now I have a more complex LKM, and, I wonder if I can parse the user buffer (i.e. just reading it - not executing it), check if the command is valid, and then only copy the user buffer (command) to a kernel buffer using copy_from_user (once you know the command is valid).

Is it OK to read user buffer from kernel space?

Upvotes: 1

Views: 37

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