The branch stable/13 has been updated by kib:
URL:
https://cgit.FreeBSD.org/src/commit/?id=5524122ee3b78b3a9bba1d0a0d9b8ac080a8e6d8
commit 5524122ee3b78b3a9bba1d0a0d9b8ac080a8e6d8
Author: Konstantin Belousov <k...@freebsd.org>
AuthorDate: 2021-03-30 15:40:02 +0000
Commit: Konstantin Belousov <k...@freebsd.org>
CommitDate: 2021-04-06 00:47:34 +0000
x86: clear %db registers in new process
PR: 254661
(cherry picked from commit 8223717ce62c1ad0becc34ce69fe2d1771f3ba05)
---
sys/amd64/amd64/vm_machdep.c | 8 ++++++++
sys/i386/i386/vm_machdep.c | 8 ++++++++
2 files changed, 16 insertions(+)
diff --git a/sys/amd64/amd64/vm_machdep.c b/sys/amd64/amd64/vm_machdep.c
index f64259decbff..98d212dc8771 100644
--- a/sys/amd64/amd64/vm_machdep.c
+++ b/sys/amd64/amd64/vm_machdep.c
@@ -229,6 +229,14 @@ cpu_fork(struct thread *td1, struct proc *p2, struct
thread *td2, int flags)
copy_thread(td1, td2);
+ /* Reset debug registers in the new process */
+ pcb2->pcb_dr0 = 0;
+ pcb2->pcb_dr1 = 0;
+ pcb2->pcb_dr2 = 0;
+ pcb2->pcb_dr3 = 0;
+ pcb2->pcb_dr6 = 0;
+ pcb2->pcb_dr7 = 0;
+
/* Point mdproc and then copy over p1's contents */
mdp2 = &p2->p_md;
bcopy(&p1->p_md, mdp2, sizeof(*mdp2));
diff --git a/sys/i386/i386/vm_machdep.c b/sys/i386/i386/vm_machdep.c
index c04fb57db4b1..ed40ebe5d1c8 100644
--- a/sys/i386/i386/vm_machdep.c
+++ b/sys/i386/i386/vm_machdep.c
@@ -241,6 +241,14 @@ cpu_fork(struct thread *td1, struct proc *p2, struct
thread *td2, int flags)
copy_thread(td1, td2);
+ /* Reset debug registers in the new process */
+ pcb2->pcb_dr0 = 0;
+ pcb2->pcb_dr1 = 0;
+ pcb2->pcb_dr2 = 0;
+ pcb2->pcb_dr3 = 0;
+ pcb2->pcb_dr6 = 0;
+ pcb2->pcb_dr7 = 0;
+
/* Point mdproc and then copy over td1's contents */
mdp2 = &p2->p_md;
bcopy(&p1->p_md, mdp2, sizeof(*mdp2));
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