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initialise the kvm errbuf so that if an error occurs, but the 

internal _kvm_*err() functions aren't called, stack garbage is
not reported as an error string.

call _kvm_err() if _kvm_kvatop() fails.  now the above is not
triggered anymore :-)
This commit is contained in:
mrg 2018-11-05 00:43:30 +00:00
parent ec787da840
commit 19db227738
1 changed files with 6 additions and 3 deletions
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9
lib/libkvm/kvm.c
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@ -1,4 +1,4 @@
/* $NetBSD: kvm.c,v 1.103 2018/02/07 14:03:18 maxv Exp $ */
/* $NetBSD: kvm.c,v 1.104 2018/11/05 00:43:30 mrg Exp $ */
/*-
* Copyright (c) 1989, 1992, 1993
@ -38,7 +38,7 @@
#if 0
static char sccsid[] = "@(#)kvm.c 8.2 (Berkeley) 2/13/94";
#else
__RCSID("$NetBSD: kvm.c,v 1.103 2018/02/07 14:03:18 maxv Exp $");
__RCSID("$NetBSD: kvm.c,v 1.104 2018/11/05 00:43:30 mrg Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
@ -255,6 +255,7 @@ _kvm_open(kvm_t *kd, const char *uf, const char *mf, const char *sf, int flag,
kd->fdalign = 1;
kd->iobuf = NULL;
kd->iobufsz = 0;
kd->errbuf[0] = '\0';
if (flag & KVM_NO_FILES) {
kd->alive = KVM_ALIVE_SYSCTL;
@ -851,8 +852,10 @@ kvm_read(kvm_t *kd, u_long kva, void *buf, size_t len)
off_t foff;
cc = _kvm_kvatop(kd, (vaddr_t)kva, &pa);
if (cc == 0)
if (cc == 0) {
_kvm_err(kd, kd->program, "_kvm_kvatop(%lx)", kva);
return (-1);
}
if (cc > len)
cc = len;
foff = _kvm_pa2off(kd, pa);