• Oleg Nesterov's avatar
    ptrace/x86: flush_ptrace_hw_breakpoint() shoule clear the virtual debug registers · f7da04c9
    Oleg Nesterov authored
    flush_ptrace_hw_breakpoint() destroys the counters set by ptrace, but
    "leaks" ->debugreg6 and ->ptrace_dr7.
    
    The problem is minor, but still it doesn't look right and flush_thread()
    did this until commit 66cb5917 ("hw-breakpoints: use the new wrapper
    routines to access debug registers in process/thread code").  Now that
    PTRACE_DETACH does flush_ too this makes even more sense.
    Signed-off-by: default avatarOleg Nesterov <oleg@redhat.com>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Ingo Molnar <mingo@kernel.org>
    Cc: Jan Kratochvil <jan.kratochvil@redhat.com>
    Cc: Michael Neuling <mikey@neuling.org>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Paul Mundt <lethal@linux-sh.org>
    Cc: Will Deacon <will.deacon@arm.com>
    Cc: Prasad <prasad@linux.vnet.ibm.com>
    Cc: Russell King <linux@arm.linux.org.uk>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    f7da04c9
hw_breakpoint.c 12.3 KB