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slirp updates

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Peter Maydell (4):
   slirp: Don't pass possibly -1 fd to send()
   slirp: Use g_new() to allocate sockets in socreate()
   slirp: Remove code that handles socreate() failure
   slirp: fork_exec(): create and connect child socket before fork()
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Merge remote-tracking branch 'remotes/thibault/tags/samuel-thibault' into staging

slirp updates

Peter Maydell (4):
  slirp: Don't pass possibly -1 fd to send()
  slirp: Use g_new() to allocate sockets in socreate()
  slirp: Remove code that handles socreate() failure
  slirp: fork_exec(): create and connect child socket before fork()

# gpg: Signature made Sat 10 Nov 2018 14:08:53 GMT
# gpg:                using RSA key E3F65A9E9560DB4C
# gpg: Good signature from "Samuel Thibault <samuel.thibault@aquilenet.fr>"
# gpg:                 aka "Samuel Thibault <sthibault@debian.org>"
# gpg:                 aka "Samuel Thibault <samuel.thibault@gnu.org>"
# gpg:                 aka "Samuel Thibault <samuel.thibault@inria.fr>"
# gpg:                 aka "Samuel Thibault <samuel.thibault@labri.fr>"
# gpg:                 aka "Samuel Thibault <samuel.thibault@ens-lyon.org>"
# gpg:                 aka "Samuel Thibault <samuel.thibault@u-bordeaux.fr>"
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 900C B024 B679 31D4 0F82  304B D017 8C76 7D06 9EE6
#      Subkey fingerprint: 33FA 7B64 6195 01F8 CE9C  8F97 E3F6 5A9E 9560 DB4C

* remotes/thibault/tags/samuel-thibault:
  slirp: fork_exec(): create and connect child socket before fork()
  slirp: Remove code that handles socreate() failure
  slirp: Use g_new() to allocate sockets in socreate()
  slirp: Don't pass possibly -1 fd to send()

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2018-11-12 10:12:07 +00:00
commit 460f0236c1
8 changed files with 56 additions and 55 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
slirp/ip_icmp.c
View File

@ -160,7 +160,7 @@ icmp_input(struct mbuf *m, int hlen)
} else {
struct socket *so;
struct sockaddr_storage addr;
if ((so = socreate(slirp)) == NULL) goto freeit;
so = socreate(slirp);
if (icmp_send(so, m, hlen) == 0) {
return;
}

55
slirp/misc.c
View File

@ -85,9 +85,10 @@ fork_exec(struct socket *so, const char *ex, int do_pty)
int
fork_exec(struct socket *so, const char *ex, int do_pty)
{
int s;
struct sockaddr_in addr;
int s, cs;
struct sockaddr_in addr, csaddr;
socklen_t addrlen = sizeof(addr);
socklen_t csaddrlen = sizeof(csaddr);
int opt;
const char *argv[256];
/* don't want to clobber the original */
@ -120,10 +121,35 @@ fork_exec(struct socket *so, const char *ex, int do_pty)
}
}
if (getsockname(s, (struct sockaddr *)&csaddr, &csaddrlen) < 0) {
closesocket(s);
return 0;
}
cs = qemu_socket(AF_INET, SOCK_STREAM, 0);
if (cs < 0) {
closesocket(s);
return 0;
}
csaddr.sin_addr = loopback_addr;
/*
* This connect won't block because we've already listen()ed on
* the server end (even though we won't accept() the connection
* until later on).
*/
do {
ret = connect(cs, (struct sockaddr *)&csaddr, csaddrlen);
} while (ret < 0 && errno == EINTR);
if (ret < 0) {
closesocket(s);
closesocket(cs);
return 0;
}
pid = fork();
switch(pid) {
case -1:
error_report("Error: fork failed: %s", strerror(errno));
closesocket(cs);
close(s);
return 0;
@ -131,21 +157,10 @@ fork_exec(struct socket *so, const char *ex, int do_pty)
setsid();
/* Set the DISPLAY */
getsockname(s, (struct sockaddr *)&addr, &addrlen);
close(s);
/*
* Connect to the socket
* XXX If any of these fail, we're in trouble!
*/
s = qemu_socket(AF_INET, SOCK_STREAM, 0);
addr.sin_addr = loopback_addr;
do {
ret = connect(s, (struct sockaddr *)&addr, addrlen);
} while (ret < 0 && errno == EINTR);
dup2(s, 0);
dup2(s, 1);
dup2(s, 2);
dup2(cs, 0);
dup2(cs, 1);
dup2(cs, 2);
for (s = getdtablesize() - 1; s >= 3; s--)
close(s);
@ -178,12 +193,10 @@ fork_exec(struct socket *so, const char *ex, int do_pty)
default:
qemu_add_child_watch(pid);
closesocket(cs);
/*
* XXX this could block us...
* XXX Should set a timer here, and if accept() doesn't
* return after X seconds, declare it a failure
* The only reason this will block forever is if socket()
* of connect() fail in the child process
* This should never block, because we already connect()ed
* on the child end before we forked.
*/
do {
so->s = accept(s, (struct sockaddr *)&addr, &addrlen);

14
slirp/slirp.c
View File

@ -1091,6 +1091,17 @@ ssize_t slirp_send(struct socket *so, const void *buf, size_t len, int flags)
return len;
}
if (so->s == -1) {
/*
* This should in theory not happen but it is hard to be
* sure because some code paths will end up with so->s == -1
* on a failure but don't dispose of the struct socket.
* Check specifically, so we don't pass -1 to send().
*/
errno = EBADF;
return -1;
}
return send(so->s, buf, len, flags);
}
@ -1466,9 +1477,6 @@ static int slirp_state_load(QEMUFile *f, void *opaque, int version_id)
int ret;
struct socket *so = socreate(slirp);
if (!so)
return -ENOMEM;
ret = vmstate_load_state(f, &vmstate_slirp_socket, so, version_id);
if (ret < 0)

15
slirp/socket.c
View File

@ -46,17 +46,15 @@ struct socket *solookup(struct socket **last, struct socket *head,
struct socket *
socreate(Slirp *slirp)
{
struct socket *so;
struct socket *so = g_new(struct socket, 1);
so = (struct socket *)malloc(sizeof(struct socket));
if(so) {
memset(so, 0, sizeof(struct socket));
so->so_state = SS_NOFDREF;
so->s = -1;
so->slirp = slirp;
so->pollfds_idx = -1;
}
return(so);
return so;
}
/*
@ -110,7 +108,7 @@ sofree(struct socket *so)
if (so->so_tcpcb) {
free(so->so_tcpcb);
}
free(so);
g_free(so);
}
size_t sopreprbuf(struct socket *so, struct iovec *iov, int *np)
@ -715,13 +713,10 @@ tcp_listen(Slirp *slirp, uint32_t haddr, u_int hport, uint32_t laddr,
DEBUG_ARG("flags = %x", flags);
so = socreate(slirp);
if (!so) {
return NULL;
}
/* Don't tcp_attach... we don't need so_snd nor so_rcv */
if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL) {
free(so);
g_free(so);
return NULL;
}
insque(so, &slirp->tcb);

5
slirp/tcp_input.c
View File

@ -429,10 +429,9 @@ findso:
if ((tiflags & (TH_SYN|TH_FIN|TH_RST|TH_URG|TH_ACK)) != TH_SYN)
goto dropwithreset;
if ((so = socreate(slirp)) == NULL)
goto dropwithreset;
so = socreate(slirp);
if (tcp_attach(so) < 0) {
free(so); /* Not sofree (if it failed, it's not insqued) */
g_free(so); /* Not sofree (if it failed, it's not insqued) */
goto dropwithreset;
}

7
slirp/tcp_subr.c
View File

@ -469,13 +469,8 @@ void tcp_connect(struct socket *inso)
so = inso;
} else {
so = socreate(slirp);
if (so == NULL) {
/* If it failed, get rid of the pending connection */
closesocket(accept(inso->s, (struct sockaddr *)&addr, &addrlen));
return;
}
if (tcp_attach(so) < 0) {
free(so); /* NOT sofree */
g_free(so); /* NOT sofree */
return;
}
so->lhost = inso->lhost;

6
slirp/udp.c
View File

@ -171,9 +171,6 @@ udp_input(register struct mbuf *m, int iphlen)
* create one
*/
so = socreate(slirp);
if (!so) {
goto bad;
}
if (udp_attach(so, AF_INET) == -1) {
DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
errno,strerror(errno)));
@ -331,9 +328,6 @@ udp_listen(Slirp *slirp, uint32_t haddr, u_int hport, uint32_t laddr,
socklen_t addrlen = sizeof(struct sockaddr_in);
so = socreate(slirp);
if (!so) {
return NULL;
}
so->s = qemu_socket(AF_INET,SOCK_DGRAM,0);
if (so->s < 0) {
sofree(so);

3
slirp/udp6.c
View File

@ -91,9 +91,6 @@ void udp6_input(struct mbuf *m)
if (so == NULL) {
/* If there's no socket for this packet, create one. */
so = socreate(slirp);
if (!so) {
goto bad;
}
if (udp_attach(so, AF_INET6) == -1) {
DEBUG_MISC((dfd, " udp6_attach errno = %d-%s\n",
errno, strerror(errno)));