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If the frame is not aligned, leave right away. This place probably needs 

to be revisited, because %rbp could easily contain garbage.

Reported-by: syzbot+ecb40cf7f8acc102c29b@syzkaller.appspotmail.com
This commit is contained in:
maxv 2020-06-06 07:03:21 +00:00
parent 502296eab3
commit 0f48bfb53e
1 changed files with 4 additions and 2 deletions
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6
sys/arch/amd64/amd64/db_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: db_machdep.c,v 1.7 2020/05/14 16:57:53 maxv Exp $ */
/* $NetBSD: db_machdep.c,v 1.8 2020/06/06 07:03:21 maxv Exp $ */
/*
* Mach Operating System
@ -26,7 +26,7 @@
* rights to redistribute these changes.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: db_machdep.c,v 1.7 2020/05/14 16:57:53 maxv Exp $");
__KERNEL_RCSID(0, "$NetBSD: db_machdep.c,v 1.8 2020/06/06 07:03:21 maxv Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -151,6 +151,8 @@ db_nextframe(long **nextframe, long **retaddr, long **arg0, db_addr_t *ip,
db_get_value((long)&tf->tf_rbp, 8, false);
if (fp == NULL)
return 0;
if (((uintptr_t)fp & 7) != 0)
return 0;
*nextframe = (long *)&fp->f_frame;
*retaddr = (long *)&fp->f_retaddr;
*arg0 = (long *)&fp->f_arg0;