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| author | Oleg Nesterov <oleg@redhat.com> | 2013-08-06 19:43:37 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-08-07 00:16:32 +0400 |
| commit | 35114fcbe0b9b0fa3f6653a2a8e4c6b8a9f8cc2d (patch) | |
| tree | 520b0ab0c8aa28c808eabb81e979f01749811018 /kernel/ptrace.c | |
| parent | 1853a65ec5bd07c18f4a43e6709486c81400afa6 (diff) | |
| download | linux-35114fcbe0b9b0fa3f6653a2a8e4c6b8a9f8cc2d.tar.xz | |
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>
Diffstat (limited to 'kernel/ptrace.c')
| -rw-r--r-- | kernel/ptrace.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c index 4041f5747e73..a146ee327f6a 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -469,7 +469,6 @@ static int ptrace_detach(struct task_struct *child, unsigned int data) /* Architecture-specific hardware disable .. */ ptrace_disable(child); clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); - flush_ptrace_hw_breakpoint(child); write_lock_irq(&tasklist_lock); /* |