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

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This reverts commit fab840fc2d.

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>
This commit is contained in:
Oleg Nesterov 2013-08-06 17:43:37 +02:00 committed by Linus Torvalds
parent 1853a65ec5
commit 35114fcbe0
1 changed files with 0 additions and 1 deletions
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kernel/ptrace.c
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@ -469,7 +469,6 @@ static int ptrace_detach(struct task_struct *child, unsigned int data)
/* Architecture-specific hardware disable .. */ /* Architecture-specific hardware disable .. */
ptrace_disable(child); ptrace_disable(child);
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
flush_ptrace_hw_breakpoint(child);
write_lock_irq(&tasklist_lock); write_lock_irq(&tasklist_lock);
/* /*