This is a note to let you know that I've just added the patch titled
arm64: Clear out any singlestep state on a ptrace detach operation
to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-clear-out-any-singlestep-state-on-a-ptrace-detach-operation.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5db4fd8c52810bd9740c1240ebf89223b171aa70 Mon Sep 17 00:00:00 2001
From: John Blackwood <john.blackwood@xxxxxxxx>
Date: Mon, 7 Dec 2015 11:50:34 +0000
Subject: arm64: Clear out any singlestep state on a ptrace detach operation
From: John Blackwood <john.blackwood@xxxxxxxx>
commit 5db4fd8c52810bd9740c1240ebf89223b171aa70 upstream.
Make sure to clear out any ptrace singlestep state when a ptrace(2)
PTRACE_DETACH call is made on arm64 systems.
Otherwise, the previously ptraced task will die off with a SIGTRAP
signal if the debugger just previously singlestepped the ptraced task.
Signed-off-by: John Blackwood <john.blackwood@xxxxxxxx>
[will: added comment to justify why this is in the arch code]
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kernel/ptrace.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -58,6 +58,12 @@
*/
void ptrace_disable(struct task_struct *child)
{
+ /*
+ * This would be better off in core code, but PTRACE_DETACH has
+ * grown its fair share of arch-specific worts and changing it
+ * is likely to cause regressions on obscure architectures.
+ */
+ user_disable_single_step(child);
}
#ifdef CONFIG_HAVE_HW_BREAKPOINT
Patches currently in stable-queue which might be from john.blackwood@xxxxxxxx are
queue-4.1/arm64-clear-out-any-singlestep-state-on-a-ptrace-detach-operation.patch
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