From: Oleg Nesterov <oleg@redhat.com>
Date: Tue, 6 Aug 2013 15:43:37 +0000 (+0200)
Subject: Revert "ptrace: PTRACE_DETACH should do flush_ptrace_hw_breakpoint(child)"
X-Git-Tag: v3.11-rc5~35
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=35114fcbe0b9b0fa3f6653a2a8e4c6b8a9f8cc2d;p=pandora-kernel.git

Revert "ptrace: PTRACE_DETACH should do flush_ptrace_hw_breakpoint(child)"

This reverts commit fab840fc2d542fabcab903db8e03589a6702ba5f.

This commit even has the test-case to prove that the tracee
can be killed by SIGTRAP if the debugger does not remove the
breakpoints before PTRACE_DETACH.

However, this is exactly what wineserver deliberately does,
set_thread_context() calls PTRACE_ATTACH + PTRACE_DETACH just
for PTRACE_POKEUSER(DR*) in between.

So we should revert this fix and document that PTRACE_DETACH
should keep the breakpoints.

Reported-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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