Commit 5db4fd8c authored by John Blackwood's avatar John Blackwood Committed by Will Deacon

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

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: default avatarJohn Blackwood <john.blackwood@ccur.com>
[will: added comment to justify why this is in the arch code]
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent db3899a6
...@@ -58,6 +58,12 @@ ...@@ -58,6 +58,12 @@
*/ */
void ptrace_disable(struct task_struct *child) 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 #ifdef CONFIG_HAVE_HW_BREAKPOINT
......
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