git: 94172affa43a - main - amd64: clear debug registers on execing 32bit Linux binary

[Konstantin Belousov]

The branch main has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=94172affa43af15fe3b50293a96c292eca30c386

commit 94172affa43af15fe3b50293a96c292eca30c386
Author:     Konstantin Belousov <kib at FreeBSD.org>
AuthorDate: 2021-04-09 23:25:06 +0000
Commit:     Konstantin Belousov <kib at FreeBSD.org>
CommitDate: 2021-04-10 01:25:02 +0000

    amd64: clear debug registers on execing 32bit Linux binary
    
    Reviewed by:    jhb
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week
    Differential revision:  https://reviews.freebsd.org/D29687
---
 sys/amd64/linux32/linux32_sysvec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/amd64/linux32/linux32_sysvec.c b/sys/amd64/linux32/linux32_sysvec.c
index bb86baefaec4..3790d0fcb69c 100644
--- a/sys/amd64/linux32/linux32_sysvec.c
+++ b/sys/amd64/linux32/linux32_sysvec.c
@@ -722,6 +722,8 @@ linux_exec_setregs(struct thread *td, struct image_params *imgp,
 	regs->tf_cs = _ucode32sel;
 	regs->tf_rbx = (register_t)imgp->ps_strings;
 
+	x86_clear_dbregs(pcb);
+
 	fpstate_drop(td);
 
 	/* Do full restore on return so that we can change to a different %cs */