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| author | Konstantin Belousov <kib@FreeBSD.org> | 2021-03-30 15:40:02 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2021-04-06 00:47:34 +0000 |
| commit | 5524122ee3b78b3a9bba1d0a0d9b8ac080a8e6d8 (patch) | |
| tree | c2a4ff908e0f25d3fb2e73450b495df7ef6d2005 | |
| parent | fb698c2c6dd1a0f8c5dd00888294dd272a42602c (diff) | |
| download | src-5524122ee3b78b3a9bba1d0a0d9b8ac080a8e6d8.tar.gz src-5524122ee3b78b3a9bba1d0a0d9b8ac080a8e6d8.zip | |
x86: clear %db registers in new process
PR: 254661
(cherry picked from commit 8223717ce62c1ad0becc34ce69fe2d1771f3ba05)
| -rw-r--r-- | sys/amd64/amd64/vm_machdep.c | 8 | ||||
| -rw-r--r-- | sys/i386/i386/vm_machdep.c | 8 |
2 files changed, 16 insertions, 0 deletions
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)); |