Re: Some questions about kernel programming

[Eugene L. Vorokov]

Forgot to Cc: here:

> You can't call kernel strlen on a userland address, you must do
> something like this:

How so ? It seems to work for me. For instance, I used userland
address space buffer to simulate __getcwd() syscall on the current
process (I was hacking open() syscall and log full path of the file
to the syslog). I simulate mmap() with MAP_ANON and fd == -1 on
that process, then I do __getcwd() to the buffer allocated, and 
then I'm very well able to call strlen() on that userland buffer, 
as well as other str* functions. So generally I think it works.

Regards,
Eugene


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