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authorChristoph Hellwig <hch@lst.de>2020-04-24 08:43:38 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2020-04-27 02:07:40 -0400
commit32927393dc1ccd60fb2bdc05b9e8e88753761469 (patch)
treec488a5564cdde7594c953219a98e22fb4865c812 /net/decnet
parentf461d2dcd511c020a26d4d791fae595c65ed09b6 (diff)
sysctl: pass kernel pointers to ->proc_handler
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. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Andrey Ignatov <rdna@fb.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'net/decnet')
-rw-r--r--net/decnet/dn_dev.c7
-rw-r--r--net/decnet/sysctl_net_decnet.c27
2 files changed, 11 insertions, 23 deletions
diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
index cca7ae712995..65abcf1b3210 100644
--- a/net/decnet/dn_dev.c
+++ b/net/decnet/dn_dev.c
@@ -160,8 +160,8 @@ static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MU
static int min_priority[1];
static int max_priority[] = { 127 }; /* From DECnet spec */
-static int dn_forwarding_proc(struct ctl_table *, int,
- void __user *, size_t *, loff_t *);
+static int dn_forwarding_proc(struct ctl_table *, int, void *, size_t *,
+ loff_t *);
static struct dn_dev_sysctl_table {
struct ctl_table_header *sysctl_header;
struct ctl_table dn_dev_vars[5];
@@ -245,8 +245,7 @@ static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
}
static int dn_forwarding_proc(struct ctl_table *table, int write,
- void __user *buffer,
- size_t *lenp, loff_t *ppos)
+ void *buffer, size_t *lenp, loff_t *ppos)
{
#ifdef CONFIG_DECNET_ROUTER
struct net_device *dev = table->extra1;
diff --git a/net/decnet/sysctl_net_decnet.c b/net/decnet/sysctl_net_decnet.c
index 55bf64a22b59..deae519bdeec 100644
--- a/net/decnet/sysctl_net_decnet.c
+++ b/net/decnet/sysctl_net_decnet.c
@@ -134,8 +134,7 @@ static int parse_addr(__le16 *addr, char *str)
}
static int dn_node_address_handler(struct ctl_table *table, int write,
- void __user *buffer,
- size_t *lenp, loff_t *ppos)
+ void *buffer, size_t *lenp, loff_t *ppos)
{
char addr[DN_ASCBUF_LEN];
size_t len;
@@ -148,10 +147,7 @@ static int dn_node_address_handler(struct ctl_table *table, int write,
if (write) {
len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1);
-
- if (copy_from_user(addr, buffer, len))
- return -EFAULT;
-
+ memcpy(addr, buffer, len);
addr[len] = 0;
strip_it(addr);
@@ -173,11 +169,9 @@ static int dn_node_address_handler(struct ctl_table *table, int write,
len = strlen(addr);
addr[len++] = '\n';
- if (len > *lenp) len = *lenp;
-
- if (copy_to_user(buffer, addr, len))
- return -EFAULT;
-
+ if (len > *lenp)
+ len = *lenp;
+ memcpy(buffer, addr, len);
*lenp = len;
*ppos += len;
@@ -185,8 +179,7 @@ static int dn_node_address_handler(struct ctl_table *table, int write,
}
static int dn_def_dev_handler(struct ctl_table *table, int write,
- void __user *buffer,
- size_t *lenp, loff_t *ppos)
+ void *buffer, size_t *lenp, loff_t *ppos)
{
size_t len;
struct net_device *dev;
@@ -201,9 +194,7 @@ static int dn_def_dev_handler(struct ctl_table *table, int write,
if (*lenp > 16)
return -E2BIG;
- if (copy_from_user(devname, buffer, *lenp))
- return -EFAULT;
-
+ memcpy(devname, buffer, *lenp);
devname[*lenp] = 0;
strip_it(devname);
@@ -238,9 +229,7 @@ static int dn_def_dev_handler(struct ctl_table *table, int write,
if (len > *lenp) len = *lenp;
- if (copy_to_user(buffer, devname, len))
- return -EFAULT;
-
+ memcpy(buffer, devname, len);
*lenp = len;
*ppos += len;