How to temporary change 'current' (task)

From: Vasiliy Kulikov
Date: Fri Jun 17 2011 - 04:37:10 EST


I wonder whether there is a simple way to temporary switch 'current' to
another task and then switch it back with minimum side effects? I need
it to call "reversed" ptrace_may_access() with swapped current and
target task. Introducing ptrace_task_may_access_me() would produce too
much noise in LSM (it also needs reversed security_ptrace_access_check()),
which is too loud for my needs.

Specifically, I need it to filter taskstats and proc connector requests
for a restriction of getting other processes' information:

As the check is handled in the context of the ptrace target process,
ptrace_may_access() doesn't fit my needs.


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