提交 b51f26b1 编写于 作者: P Paul Moore 提交者: David S. Miller

net: don't unnecessarily load kernel modules in dev_ioctl()

Starting with v4.16-rc1 we've been seeing a higher than usual number
of requests for the kernel to load networking modules, even on events
which shouldn't trigger a module load (e.g. ioctl(TCGETS)).  Stephen
Smalley suggested the problem may lie in commit 44c02a2c
("dev_ioctl(): move copyin/copyout to callers") which moves changes
the network dev_ioctl() function to always call dev_load(),
regardless of the requested ioctl.

This patch moves the dev_load() calls back into the individual ioctls
while preserving the rest of the original patch.
Reported-by: NDominick Grift <dac.override@gmail.com>
Suggested-by: NStephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: NPaul Moore <paul@paul-moore.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 e05836ac
......@@ -402,8 +402,6 @@ int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_c
if (colon)
*colon = 0;
dev_load(net, ifr->ifr_name);
/*
* See which interface the caller is talking about.
*/
......@@ -423,6 +421,7 @@ int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_c
case SIOCGIFMAP:
case SIOCGIFINDEX:
case SIOCGIFTXQLEN:
dev_load(net, ifr->ifr_name);
rcu_read_lock();
ret = dev_ifsioc_locked(net, ifr, cmd);
rcu_read_unlock();
......@@ -431,6 +430,7 @@ int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_c
return ret;
case SIOCETHTOOL:
dev_load(net, ifr->ifr_name);
rtnl_lock();
ret = dev_ethtool(net, ifr);
rtnl_unlock();
......@@ -447,6 +447,7 @@ int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_c
case SIOCGMIIPHY:
case SIOCGMIIREG:
case SIOCSIFNAME:
dev_load(net, ifr->ifr_name);
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;
rtnl_lock();
......@@ -494,6 +495,7 @@ int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_c
/* fall through */
case SIOCBONDSLAVEINFOQUERY:
case SIOCBONDINFOQUERY:
dev_load(net, ifr->ifr_name);
rtnl_lock();
ret = dev_ifsioc(net, ifr, cmd);
rtnl_unlock();
......@@ -518,6 +520,7 @@ int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_c
cmd == SIOCGHWTSTAMP ||
(cmd >= SIOCDEVPRIVATE &&
cmd <= SIOCDEVPRIVATE + 15)) {
dev_load(net, ifr->ifr_name);
rtnl_lock();
ret = dev_ifsioc(net, ifr, cmd);
rtnl_unlock();
......
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