git: 1fd001db9c33 - main - arm64: clear debug register state on fork
Mitchell Horne
mhorne at FreeBSD.org
Thu Apr 8 12:43:39 UTC 2021
The branch main has been updated by mhorne:
URL: https://cgit.FreeBSD.org/src/commit/?id=1fd001db9c330f133708f3c04c8852f8b07cfed9
commit 1fd001db9c330f133708f3c04c8852f8b07cfed9
Author: Mitchell Horne <mhorne at FreeBSD.org>
AuthorDate: 2021-04-07 19:23:46 +0000
Commit: Mitchell Horne <mhorne at FreeBSD.org>
CommitDate: 2021-04-08 12:41:41 +0000
arm64: clear debug register state on fork
Following the analogous change for amd64 and i386 in 8223717ce62c,
ensure that new processes start with these registers inactive.
PR: 254661
Reported by: Michał Górny
Reviewed by: kib, emaste
MFC after: 3 days
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D29630
---
sys/arm64/arm64/vm_machdep.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/sys/arm64/arm64/vm_machdep.c b/sys/arm64/arm64/vm_machdep.c
index c37f1d849359..a7b02e98959f 100644
--- a/sys/arm64/arm64/vm_machdep.c
+++ b/sys/arm64/arm64/vm_machdep.c
@@ -91,6 +91,9 @@ cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
td2->td_pcb = pcb2;
bcopy(td1->td_pcb, pcb2, sizeof(*pcb2));
+ /* Clear the debug register state. */
+ bzero(&pcb2->pcb_dbg_regs, sizeof(pcb2->pcb_dbg_regs));
+
tf = (struct trapframe *)STACKALIGN((struct trapframe *)pcb2 - 1);
bcopy(td1->td_frame, tf, sizeof(*tf));
tf->tf_x[0] = 0;
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