Date: Fri, 17 Jun 2011 12:36:51 +0400 From: Vasiliy Kulikov <segooon@...il.com> To: linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org, Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>, kernel-hardening@...ts.openwall.com Subject: How to temporary change 'current' (task) Hi, 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: http://permalink.gmane.org/gmane.linux.kernel/1155354 As the check is handled in the context of the ptrace target process, ptrace_may_access() doesn't fit my needs. Thanks, -- Vasiliy
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