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There is no need for the stackgap in sys_bind() and sys_connect(). 

If sa_len is zero, believing the size passed to bind/connect seems
better than trying to strlen somthing that might run off the mapped kma.
Verify the address family against the array size before indexing.
This commit is contained in:
dsl 2007-06-17 21:30:11 +00:00
parent cf80941288
commit 4147586696
1 changed files with 45 additions and 58 deletions
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103
sys/compat/darwin/darwin_socket.c
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@ -1,4 +1,4 @@
/* $NetBSD: darwin_socket.c,v 1.13 2007/03/04 06:01:14 christos Exp $ */
/* $NetBSD: darwin_socket.c,v 1.14 2007/06/17 21:30:11 dsl Exp $ */
/*-
* Copyright (c) 2004 The NetBSD Foundation, Inc.
@ -37,7 +37,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: darwin_socket.c,v 1.13 2007/03/04 06:01:14 christos Exp $");
__KERNEL_RCSID(0, "$NetBSD: darwin_socket.c,v 1.14 2007/06/17 21:30:11 dsl Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -47,7 +47,7 @@ __KERNEL_RCSID(0, "$NetBSD: darwin_socket.c,v 1.13 2007/03/04 06:01:14 christos
#include <sys/socketvar.h>
#include <sys/un.h>
#include <sys/ucred.h>
#include <sys/mount.h>
#include <sys/mbuf.h>
#include <sys/syscallargs.h>
#include <compat/sys/signal.h>
@ -160,6 +160,28 @@ native_to_darwin_sockaddr(nsa, dsa)
return 0;
}
static int
fixup_darwin_sockaddr(struct mbuf *nam)
{
struct sockaddr *sa = mtod(nam, void *);
if ((unsigned)sa->sa_family >= __arraycount(darwin_to_native_af))
return EPROTONOSUPPORT;
sa->sa_family = darwin_to_native_af[sa->sa_family];
/*
* sa_len is zero for AF_LOCAL sockets, believe size we copied in!
* The code used to strlen the filename, but that way lies madness!
*/
if (sa->sa_len > nam->m_len || sa->sa_len == 0)
sa->sa_len = nam->m_len;
else
nam->m_len = sa->sa_len;
return 0;
}
int
darwin_to_native_sockaddr(dsa, nsa)
struct sockaddr *dsa;
@ -200,6 +222,9 @@ darwin_to_native_sockaddr(dsa, nsa)
}
}
if ((unsigned)dsa->sa_family >= __arraycount(darwin_to_native_af))
return EPROTONOSUPPORT;
memcpy(nsa, dsa, len);
/* Array dereference is safe. sa_family is type unsigned */
nsa->ss_family = darwin_to_native_af[dsa->sa_family];
@ -220,7 +245,7 @@ darwin_sys_socket(l, v, retval)
} */ *uap = v;
struct compat_30_sys_socket_args cup;
if (SCARG(uap, domain) < 0)
if ((unsigned)SCARG(uap, domain) >= __arraycount(darwin_to_native_af))
return (EPROTONOSUPPORT);
SCARG(&cup, domain) = darwin_to_native_af[SCARG(uap, domain)];
@ -462,36 +487,17 @@ darwin_sys_connect(l, v, retval)
syscallarg(struct sockaddr *) name;
syscallarg(unsigned int *) namelen;
} */ *uap = v;
struct sys_connect_args cup;
struct proc *p = l->l_proc;
void *sg = stackgap_init(p, 0);
struct sockaddr_storage nss;
struct sockaddr_storage dss;
struct sockaddr_storage *nssp;
size_t len;
struct mbuf *nam;
int error;
nssp = stackgap_alloc(p, &sg, sizeof(*nssp));
error = sockargs(&nam, SCARG(uap, name), SCARG(uap, namelen),
MT_SONAME);
if (error == 0)
error = fixup_darwin_sockaddr(nam);
if (error == 0)
error = do_sys_connect(l, SCARG(uap, s), nam);
if ((error = copyin(SCARG(uap, name), &dss, sizeof(dss))) != 0)
return error;
if ((error = darwin_to_native_sockaddr((struct sockaddr *)&dss,
&nss)) != 0)
return error;
len = SCARG(uap, namelen);
if (nss.ss_len < len)
len = nss.ss_len;
if ((error = copyout(&nss, nssp, sizeof(nss))) != 0)
return error;
SCARG(&cup, s) = SCARG(uap, s);
SCARG(&cup, name) = (struct sockaddr *)nssp;
SCARG(&cup, namelen) = len;
return bsd_sys_connect(l, &cup, retval);
return error;
}
int
@ -505,36 +511,17 @@ darwin_sys_bind(l, v, retval)
syscallarg(struct sockaddr *) name;
syscallarg(unsigned int *) namelen;
} */ *uap = v;
struct sys_bind_args cup;
struct proc *p = l->l_proc;
void *sg = stackgap_init(p, 0);
struct sockaddr_storage nss;
struct sockaddr_storage dss;
struct sockaddr_storage *nssp;
size_t len;
struct mbuf *nam;
int error;
nssp = stackgap_alloc(p, &sg, sizeof(*nssp));
error = sockargs(&nam, SCARG(uap, name), SCARG(uap, namelen),
MT_SONAME);
if (error == 0)
error = fixup_darwin_sockaddr(nam);
if (error == 0)
error = do_sys_bind(l, SCARG(uap, s), nam);
if ((error = copyin(SCARG(uap, name), &dss, sizeof(dss))) != 0)
return error;
if ((error = darwin_to_native_sockaddr((struct sockaddr *)&dss,
&nss)) != 0)
return error;
len = SCARG(uap, namelen);
if (nss.ss_len < len)
len = nss.ss_len;
if ((error = copyout(&nss, nssp, sizeof(nss))) != 0)
return error;
SCARG(&cup, s) = SCARG(uap, s);
SCARG(&cup, name) = (struct sockaddr *)nssp;
SCARG(&cup, namelen) = len;
return bsd_sys_bind(l, &cup, retval);
return error;
}
int