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BACKPORT: sysctl: pass kernel pointers to ->proc_handler

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Instead of having all the sysctl handlers deal with user pointers, which
is rather hairy in terms of the BPF interaction, copy the input to and
from  userspace in common code.  This also means that the strings are
always NUL-terminated by the common code, making the API a little bit
safer.

As most handler just pass through the data to one of the common handlers
a lot of the changes are mechnical.

Change-Id: Ib7ad5ec475ea28257d651bdea23a4026a268c576
Signed-off-by: Christoph Hellwig <[email protected]>
Acked-by: Andrey Ignatov <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Christoph Hellwig 2020-04-24 08:43:38 +02:00 • committed by basamaryan
commit 97a739c638
No known key found for this signature in database
GPG key ID: 210D5384FB2A5885
86 changed files with 458 additions and 639 deletions
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33
net/ipv6/addrconf.c
View file

@ -6137,9 +6137,8 @@ static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
#ifdef CONFIG_SYSCTL
static
int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int *valp = ctl->data;
int val = *valp;
@ -6163,9 +6162,8 @@ int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
return ret;
}
static
int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
struct inet6_dev *idev = ctl->extra1;
int min_mtu = IPV6_MIN_MTU;
@ -6235,9 +6233,8 @@ static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
return 0;
}
static
int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int *valp = ctl->data;
int val = *valp;
@ -6261,9 +6258,8 @@ int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
return ret;
}
static
int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int *valp = ctl->data;
int ret;
@ -6304,7 +6300,7 @@ int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
}
static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
void __user *buffer, size_t *lenp,
void *buffer, size_t *lenp,
loff_t *ppos)
{
int ret = 0;
@ -6366,7 +6362,7 @@ out:
}
static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
void __user *buffer, size_t *lenp,
void *buffer, size_t *lenp,
loff_t *ppos)
{
int err;
@ -6433,8 +6429,7 @@ out:
static
int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
int write,
void __user *buffer,
int write, void *buffer,
size_t *lenp,
loff_t *ppos)
{
@ -6534,10 +6529,8 @@ int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
return 0;
}
static
int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos)
static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
int *valp = ctl->data;
int val = *valp;

3
net/ipv6/ndisc.c
View file

@ -1840,7 +1840,8 @@ static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl,
}
}
int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos)
int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void *buffer,
size_t *lenp, loff_t *ppos)
{
struct net_device *dev = ctl->extra1;
struct inet6_dev *idev;

5
net/ipv6/route.c
View file

@ -6103,9 +6103,8 @@ static int rt6_stats_seq_show(struct seq_file *seq, void *v)
#ifdef CONFIG_SYSCTL
static
int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
static int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
struct net *net;
int delay;

3
net/ipv6/sysctl_net_ipv6.c
View file

@ -27,8 +27,7 @@ static int auto_flowlabels_min;
static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
static int proc_rt6_multipath_hash_policy(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos)
void *buffer, size_t *lenp, loff_t *ppos)
{
struct net *net;
int ret;