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| author | Konstantin Belousov <kib@FreeBSD.org> | 2021-03-30 15:40:02 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2021-03-30 23:07:35 +0000 |
| commit | 8223717ce62c1ad0becc34ce69fe2d1771f3ba05 (patch) | |
| tree | b44fbd615205eda3d130bc6803581b46c7523e64 | |
| parent | 2b98ea2e51a0e38861dc8d29c2c716f2c19433d6 (diff) | |
| download | src-8223717ce62c1ad0becc34ce69fe2d1771f3ba05.tar.gz src-8223717ce62c1ad0becc34ce69fe2d1771f3ba05.zip | |
x86: clear %db registers in new process
Reported by: Michał Górny <mgorny@gentoo.org>
PR: 254661
Reviewed by: emaste, jhb
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D29496
| -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)); |