Messages in this thread | | | Date | Mon, 29 Apr 2013 17:59:11 +0200 | From | Frederic Weisbecker <> | Subject | Re: [PATCH 4/6] ptrace/x86: ptrace_write_dr7() should create bp if !disabled |
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On Thu, Apr 18, 2013 at 08:44:19PM +0200, Oleg Nesterov wrote: > 24f1e32c "hw-breakpoints: Rewrite the hw-breakpoints layer on top > of perf events" introduced the minor regression. Before this commit > > PTRACE_POKEUSER DR7, enableDR0 > PTRACE_POKEUSER DR0, address > > was perfectly valid, now PTRACE_POKEUSER(DR7) fails if DR0 was not > previously initialized by PTRACE_POKEUSER(DR0). > > Change ptrace_write_dr7() to do ptrace_register_breakpoint(addr => 0) > if !bp && !disabled. This fixes watchpoint-zeroaddr from ptrace-tests, > see https://bugzilla.redhat.com/show_bug.cgi?id=660204. > > Reported-by: Jan Kratochvil <jan.kratochvil@redhat.com> > Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
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