Subject: [merged] ptrace-x86-flush_ptrace_hw_breakpoint-shoule-clear-the-virtual-debug-registers.patch removed from -mm tree
To: oleg@xxxxxxxxxx,benh@xxxxxxxxxxxxxxxxxxx,fweisbec@xxxxxxxxx,jan.kratochvil@xxxxxxxxxx,lethal@xxxxxxxxxxxx,linux@xxxxxxxxxxxxxxxx,mikey@xxxxxxxxxxx,mingo@xxxxxxxxxx,paulus@xxxxxxxxx,prasad@xxxxxxxxxxxxxxxxxx,will.deacon@xxxxxxx,mm-commits@xxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Tue, 09 Jul 2013 16:21:25 -0700
The patch titled
Subject: ptrace/x86: flush_ptrace_hw_breakpoint() shoule clear the virtual debug registers
has been removed from the -mm tree. Its filename was
ptrace-x86-flush_ptrace_hw_breakpoint-shoule-clear-the-virtual-debug-registers.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Subject: ptrace/x86: flush_ptrace_hw_breakpoint() shoule clear the virtual debug registers
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 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: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jan Kratochvil <jan.kratochvil@xxxxxxxxxx>
Cc: Michael Neuling <mikey@xxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Paul Mundt <lethal@xxxxxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Prasad <prasad@xxxxxxxxxxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/hw_breakpoint.c | 3 +++
1 file changed, 3 insertions(+)
diff -puN arch/x86/kernel/hw_breakpoint.c~ptrace-x86-flush_ptrace_hw_breakpoint-shoule-clear-the-virtual-debug-registers arch/x86/kernel/hw_breakpoint.c
--- a/arch/x86/kernel/hw_breakpoint.c~ptrace-x86-flush_ptrace_hw_breakpoint-shoule-clear-the-virtual-debug-registers
+++ a/arch/x86/kernel/hw_breakpoint.c
@@ -393,6 +393,9 @@ void flush_ptrace_hw_breakpoint(struct t
unregister_hw_breakpoint(t->ptrace_bps[i]);
t->ptrace_bps[i] = NULL;
}
+
+ t->debugreg6 = 0;
+ t->ptrace_dr7 = 0;
}
void hw_breakpoint_restore(void)
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
origin.patch
linux-next.patch
mm-mempolicy-fix-mbind_range-vma_adjust-interaction.patch
include-linux-schedh-dont-use-task-pid-tgid-in-same_thread_group-has_group_leader_pid.patch
lockdep-introduce-lock_acquire_exclusive-shared-helper-macros.patch
lglock-update-lockdep-annotations-to-report-recursive-local-locks.patch
fput-task_work_add-can-fail-if-the-caller-has-passed-exit_task_work-fix.patch
fput-turn-list_head-delayed_fput_list-into-llist_head.patch
llist-fix-simplify-llist_add-and-llist_add_batch.patch
llist-llist_add-can-use-llist_add_batch.patch
kernel-wide-fix-missing-validations-on-__get-__put-__copy_to-__copy_from_user.patch
autofs4-allow-autofs-to-work-outside-the-initial-pid-namespace.patch
autofs4-translate-pids-to-the-right-namespace-for-the-daemon.patch
signals-eventpoll-set-saved_sigmask-at-the-start.patch
move-exit_task_namespaces-outside-of-exit_notify-fix.patch
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