git: b234b8d911cd - main - arm: Zero padding in mcontext_vfp_t in get_vfpcontext().

[John Baldwin]

The branch main has been updated by jhb:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=b234b8d911cdb4fe53032fde0cb8611ae9d0b81d

commit b234b8d911cdb4fe53032fde0cb8611ae9d0b81d
Author:     John Baldwin <j...@freebsd.org>
AuthorDate: 2022-03-25 16:57:20 +0000
Commit:     John Baldwin <j...@freebsd.org>
CommitDate: 2022-03-25 16:57:20 +0000

    arm: Zero padding in mcontext_vfp_t in get_vfpcontext().
    
    This can leak kernel stack data otherwise.
    
    Reviewed by:    imp, markj
    Sponsored by:   The University of Cambridge, Google, Inc.
    Differential Revision:  https://reviews.freebsd.org/D34594
---
 sys/arm/arm/exec_machdep.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sys/arm/arm/exec_machdep.c b/sys/arm/arm/exec_machdep.c
index fdd57d7859c5..16c43e3a14fe 100644
--- a/sys/arm/arm/exec_machdep.c
+++ b/sys/arm/arm/exec_machdep.c
@@ -107,6 +107,7 @@ get_vfpcontext(struct thread *td, mcontext_vfp_t *vfp)
                critical_exit();
        } else
                MPASS(TD_IS_SUSPENDED(td));
+       memset(vfp, 0, sizeof(*vfp));
        memcpy(vfp->mcv_reg, pcb->pcb_vfpstate.reg,
            sizeof(vfp->mcv_reg));
        vfp->mcv_fpscr = pcb->pcb_vfpstate.fpscr;