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Fix netdump configuration when VIMAGE is enabled.

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We need to set the current vnet before iterating over the global
interface list. Because the dump device may only be set from the host,
only proceed with configuration if the thread belongs to the default
vnet. [1]

Also fix a resource leak that occurs if the priv_check() in set_dumper()
fails.

Reported by:	mmacy, sbruno [1]
Reviewed by:	sbruno
X-MFC with:	r333283
Differential Revision:	https://reviews.freebsd.org/D15449
This commit is contained in:
Mark Johnston 2018-05-17 04:08:57 +00:00
parent 73e37d1deb
commit b35822d9d0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=333702
1 changed files with 17 additions and 6 deletions
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23
sys/netinet/netdump/netdump_client.c
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@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
#include <sys/conf.h>
#include <sys/disk.h>
#include <sys/endian.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/kerneldump.h>
#include <sys/mbuf.h>
@ -88,7 +89,7 @@ __FBSDID("$FreeBSD$");
static int netdump_arp_gw(void);
static void netdump_cleanup(void);
static int netdump_configure(struct netdump_conf *);
static int netdump_configure(struct netdump_conf *, struct thread *);
static int netdump_dumper(void *priv __unused, void *virtual,
vm_offset_t physical __unused, off_t offset, size_t length);
static int netdump_ether_output(struct mbuf *m, struct ifnet *ifp,
@ -1058,10 +1059,15 @@ static struct cdevsw netdump_cdevsw = {
static struct cdev *netdump_cdev;
static int
netdump_configure(struct netdump_conf *conf)
netdump_configure(struct netdump_conf *conf, struct thread *td)
{
struct ifnet *ifp;
CURVNET_SET(TD_TO_VNET(td));
if (!IS_DEFAULT_VNET(curvnet)) {
CURVNET_RESTORE();
return (EINVAL);
}
IFNET_RLOCK_NOSLEEP();
TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
if (strcmp(ifp->if_xname, conf->ndc_iface) == 0)
@ -1069,6 +1075,7 @@ netdump_configure(struct netdump_conf *conf)
}
/* XXX ref */
IFNET_RUNLOCK_NOSLEEP();
CURVNET_RESTORE();
if (ifp == NULL)
return (ENOENT);
@ -1170,13 +1177,15 @@ netdump_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t addr,
if (kda->kda_enable == 0) {
if (nd_enabled) {
error = clear_dumper(td);
if (error == 0)
if (error == 0) {
nd_enabled = 0;
netdump_mbuf_drain();
}
}
break;
}
error = netdump_configure(conf);
error = netdump_configure(conf, td);
if (error != 0)
break;
@ -1212,8 +1221,10 @@ netdump_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t addr,
explicit_bzero(encryptedkey, kda->kda_encryptedkeysize);
free(encryptedkey, M_TEMP);
}
if (error != 0)
if (error != 0) {
nd_enabled = 0;
netdump_mbuf_drain();
}
break;
default:
error = EINVAL;
@ -1268,7 +1279,7 @@ netdump_modevent(module_t mod __unused, int what, void *priv __unused)
}
/* Ignore errors; we print a message to the console. */
(void)netdump_configure(&conf);
(void)netdump_configure(&conf, curthread);
}
break;
case MOD_UNLOAD: