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arm64: Clear out any singlestep state on a ptrace detach operation

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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.

Cc: <stable@vger.kernel.org>
Signed-off-by: John Blackwood <john.blackwood@ccur.com>
[will: added comment to justify why this is in the arch code]
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
John Blackwood 2015-12-07 11:50:34 +00:00 committed by Will Deacon
parent db3899a647
commit 5db4fd8c52
1 changed files with 6 additions and 0 deletions
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6
arch/arm64/kernel/ptrace.c
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@ -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