Date: Thu, 8 Apr 2021 12:43:39 GMT From: Mitchell Horne <mhorne@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 1fd001db9c33 - main - arm64: clear debug register state on fork Message-ID: <202104081243.138Chdbc012800@gitrepo.freebsd.org>
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The branch main has been updated by mhorne: URL: https://cgit.FreeBSD.org/src/commit/?id=1fd001db9c330f133708f3c04c8852f8b07cfed9 commit 1fd001db9c330f133708f3c04c8852f8b07cfed9 Author: Mitchell Horne <mhorne@FreeBSD.org> AuthorDate: 2021-04-07 19:23:46 +0000 Commit: Mitchell Horne <mhorne@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;help
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