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kern: Add debug.crashme.null_jump.

This commit is contained in:
riastradh 2021-11-27 14:11:14 +00:00
parent 3b20c708cc
commit 553095485e
1 changed files with 13 additions and 1 deletions
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14
sys/kern/kern_crashme.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_crashme.c,v 1.4 2021/09/07 11:00:13 riastradh Exp $ */
/* $NetBSD: kern_crashme.c,v 1.5 2021/11/27 14:11:14 riastradh Exp $ */
/*
* Copyright (c) 2018, 2019 Matthew R. Green
@ -59,6 +59,7 @@ static int crashme_sysctl_forwarder(SYSCTLFN_PROTO);
static int crashme_panic(int);
static int crashme_null_deref(int);
static int crashme_null_jump(int);
#ifdef DDB
static int crashme_ddb(int);
#endif
@ -73,6 +74,7 @@ static int crashme_ddb(int);
static crashme_node nodes[] = {
CMNODE("panic", "plain old panic", crashme_panic),
CMNODE("null_deref", "null dereference", crashme_null_deref),
CMNODE("null_jump", "jump to null", crashme_null_jump),
#ifdef DDB
CMNODE("ddb", "enter ddb directly", crashme_ddb),
#endif
@ -249,6 +251,16 @@ crashme_null_deref(int flags)
return -1;
}
static int
crashme_null_jump(int flags)
{
void (*volatile f)(int) = NULL;
(*f)(flags);
/* make sure to have a nontrivial return address here */
return -1;
}
#ifdef DDB
static int
crashme_ddb(int flags)