hw breakpoints: Fix pid namespace bug
authorMatt Helsley <matthltc@us.ibm.com>
Mon, 13 Sep 2010 20:01:18 +0000 (13:01 -0700)
committerIngo Molnar <mingo@elte.hu>
Wed, 15 Sep 2010 08:43:59 +0000 (10:43 +0200)
commitd958077d007d98125766d11e82da2fd6497b91d6
treec71106f6308a16bd50fc3f58338025c7848e5ec1
parent64a48d90149bb7007275fac13eaa4cb8d8ce12ea
hw breakpoints: Fix pid namespace bug

Hardware breakpoints can't be registered within pid namespaces
because tsk->pid is passed rather than the pid in the current
namespace.

(See https://bugzilla.kernel.org/show_bug.cgi?id=17281 )

This is a quick fix demonstrating the problem but is not the
best method of solving the problem since passing pids internally
is not the best way to avoid pid namespace bugs. Subsequent patches
will show a better solution.

Much thanks to Frederic Weisbecker <fweisbec@gmail.com> for doing the
bulk of the work finding this bug.

Signed-off-by: Matt Helsley <matthltc@us.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Robin Green <greenrd@greenrd.org>
Cc: Prasad <prasad@linux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
LKML-Reference: <f63454af09fb1915717251570423eb9ddd338340.1284407762.git.matthltc@us.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
kernel/hw_breakpoint.c