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net: remove sockptr_advance

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sockptr_advance never properly worked.  Replace it with _offset variants
of copy_from_sockptr and copy_to_sockptr.

Fixes: ba423fdaa5 ("net: add a new sockptr_t type")
Reported-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reported-by: Ido Schimmel <idosch@idosch.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jason A. Donenfeld <Jason@zx2c4.com>
Tested-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig 2020-07-28 18:38:35 +02:00 committed by David S. Miller
parent 035bfd051e
commit d3c4815151
10 changed files with 49 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/crypto/chelsio/chtls/chtls_main.c
View File

@ -525,9 +525,9 @@ static int do_chtls_setsockopt(struct sock *sk, int optname,
/* Obtain version and type from previous copy */
crypto_info[0] = tmp_crypto_info;
/* Now copy the following data */
sockptr_advance(optval, sizeof(*crypto_info));
rc = copy_from_sockptr((char *)crypto_info + sizeof(*crypto_info),
optval,
rc = copy_from_sockptr_offset((char *)crypto_info +
sizeof(*crypto_info),
optval, sizeof(*crypto_info),
sizeof(struct tls12_crypto_info_aes_gcm_128)
- sizeof(*crypto_info));
@ -542,9 +542,9 @@ static int do_chtls_setsockopt(struct sock *sk, int optname,
}
case TLS_CIPHER_AES_GCM_256: {
crypto_info[0] = tmp_crypto_info;
sockptr_advance(optval, sizeof(*crypto_info));
rc = copy_from_sockptr((char *)crypto_info + sizeof(*crypto_info),
optval,
rc = copy_from_sockptr_offset((char *)crypto_info +
sizeof(*crypto_info),
optval, sizeof(*crypto_info),
sizeof(struct tls12_crypto_info_aes_gcm_256)
- sizeof(*crypto_info));

27
include/linux/sockptr.h
View File

@ -69,19 +69,26 @@ static inline bool sockptr_is_null(sockptr_t sockptr)
return !sockptr.user;
}
static inline int copy_from_sockptr(void *dst, sockptr_t src, size_t size)
static inline int copy_from_sockptr_offset(void *dst, sockptr_t src,
size_t offset, size_t size)
{
if (!sockptr_is_kernel(src))
return copy_from_user(dst, src.user, size);
memcpy(dst, src.kernel, size);
return copy_from_user(dst, src.user + offset, size);
memcpy(dst, src.kernel + offset, size);
return 0;
}
static inline int copy_to_sockptr(sockptr_t dst, const void *src, size_t size)
static inline int copy_from_sockptr(void *dst, sockptr_t src, size_t size)
{
return copy_from_sockptr_offset(dst, src, 0, size);
}
static inline int copy_to_sockptr_offset(sockptr_t dst, size_t offset,
const void *src, size_t size)
{
if (!sockptr_is_kernel(dst))
return copy_to_user(dst.user, src, size);
memcpy(dst.kernel, src, size);
return copy_to_user(dst.user + offset, src, size);
memcpy(dst.kernel + offset, src, size);
return 0;
}
@ -112,14 +119,6 @@ static inline void *memdup_sockptr_nul(sockptr_t src, size_t len)
return p;
}
static inline void sockptr_advance(sockptr_t sockptr, size_t len)
{
if (sockptr_is_kernel(sockptr))
sockptr.kernel += len;
else
sockptr.user += len;
}
static inline long strncpy_from_sockptr(char *dst, sockptr_t src, size_t count)
{
if (sockptr_is_kernel(src)) {

5
net/dccp/proto.c
View File

@ -426,9 +426,8 @@ static int dccp_setsockopt_service(struct sock *sk, const __be32 service,
return -ENOMEM;
sl->dccpsl_nr = optlen / sizeof(u32) - 1;
sockptr_advance(optval, sizeof(service));
if (copy_from_sockptr(sl->dccpsl_list, optval,
optlen - sizeof(service)) ||
if (copy_from_sockptr_offset(sl->dccpsl_list, optval,
sizeof(service), optlen - sizeof(service)) ||
dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) {
kfree(sl);
return -EFAULT;

8
net/ipv4/netfilter/arp_tables.c
View File

@ -971,8 +971,8 @@ static int do_replace(struct net *net, sockptr_t arg, unsigned int len)
return -ENOMEM;
loc_cpu_entry = newinfo->entries;
sockptr_advance(arg, sizeof(tmp));
if (copy_from_sockptr(loc_cpu_entry, arg, tmp.size) != 0) {
if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp),
tmp.size) != 0) {
ret = -EFAULT;
goto free_newinfo;
}
@ -1267,8 +1267,8 @@ static int compat_do_replace(struct net *net, sockptr_t arg, unsigned int len)
return -ENOMEM;
loc_cpu_entry = newinfo->entries;
sockptr_advance(arg, sizeof(tmp));
if (copy_from_sockptr(loc_cpu_entry, arg, tmp.size) != 0) {
if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp),
tmp.size) != 0) {
ret = -EFAULT;
goto free_newinfo;
}

8
net/ipv4/netfilter/ip_tables.c
View File

@ -1126,8 +1126,8 @@ do_replace(struct net *net, sockptr_t arg, unsigned int len)
return -ENOMEM;
loc_cpu_entry = newinfo->entries;
sockptr_advance(arg, sizeof(tmp));
if (copy_from_sockptr(loc_cpu_entry, arg, tmp.size) != 0) {
if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp),
tmp.size) != 0) {
ret = -EFAULT;
goto free_newinfo;
}
@ -1508,8 +1508,8 @@ compat_do_replace(struct net *net, sockptr_t arg, unsigned int len)
return -ENOMEM;
loc_cpu_entry = newinfo->entries;
sockptr_advance(arg, sizeof(tmp));
if (copy_from_sockptr(loc_cpu_entry, arg, tmp.size) != 0) {
if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp),
tmp.size) != 0) {
ret = -EFAULT;
goto free_newinfo;
}

5
net/ipv4/tcp.c
View File

@ -2801,12 +2801,13 @@ static int tcp_repair_options_est(struct sock *sk, sockptr_t optbuf,
{
struct tcp_sock *tp = tcp_sk(sk);
struct tcp_repair_opt opt;
size_t offset = 0;
while (len >= sizeof(opt)) {
if (copy_from_sockptr(&opt, optbuf, sizeof(opt)))
if (copy_from_sockptr_offset(&opt, optbuf, offset, sizeof(opt)))
return -EFAULT;
sockptr_advance(optbuf, sizeof(opt));
offset += sizeof(opt);
len -= sizeof(opt);
switch (opt.opt_code) {

11
net/ipv6/ip6_flowlabel.c
View File

@ -401,8 +401,8 @@ fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq,
memset(fl->opt, 0, sizeof(*fl->opt));
fl->opt->tot_len = sizeof(*fl->opt) + olen;
err = -EFAULT;
sockptr_advance(optval, CMSG_ALIGN(sizeof(*freq)));
if (copy_from_sockptr(fl->opt + 1, optval, olen))
if (copy_from_sockptr_offset(fl->opt + 1, optval,
CMSG_ALIGN(sizeof(*freq)), olen))
goto done;
msg.msg_controllen = olen;
@ -703,9 +703,10 @@ release:
goto recheck;
if (!freq->flr_label) {
sockptr_advance(optval,
offsetof(struct in6_flowlabel_req, flr_label));
if (copy_to_sockptr(optval, &fl->label, sizeof(fl->label))) {
size_t offset = offsetof(struct in6_flowlabel_req, flr_label);
if (copy_to_sockptr_offset(optval, offset, &fl->label,
sizeof(fl->label))) {
/* Intentionally ignore fault. */
}
}

8
net/ipv6/netfilter/ip6_tables.c
View File

@ -1143,8 +1143,8 @@ do_replace(struct net *net, sockptr_t arg, unsigned int len)
return -ENOMEM;
loc_cpu_entry = newinfo->entries;
sockptr_advance(arg, sizeof(tmp));
if (copy_from_sockptr(loc_cpu_entry, arg, tmp.size) != 0) {
if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp),
tmp.size) != 0) {
ret = -EFAULT;
goto free_newinfo;
}
@ -1517,8 +1517,8 @@ compat_do_replace(struct net *net, sockptr_t arg, unsigned int len)
return -ENOMEM;
loc_cpu_entry = newinfo->entries;
sockptr_advance(arg, sizeof(tmp));
if (copy_from_sockptr(loc_cpu_entry, arg, tmp.size) != 0) {
if (copy_from_sockptr_offset(loc_cpu_entry, arg, sizeof(tmp),
tmp.size) != 0) {
ret = -EFAULT;
goto free_newinfo;
}

7
net/netfilter/x_tables.c
View File

@ -1050,6 +1050,7 @@ EXPORT_SYMBOL_GPL(xt_check_target);
void *xt_copy_counters(sockptr_t arg, unsigned int len,
struct xt_counters_info *info)
{
size_t offset;
void *mem;
u64 size;
@ -1067,7 +1068,7 @@ void *xt_copy_counters(sockptr_t arg, unsigned int len,
memcpy(info->name, compat_tmp.name, sizeof(info->name) - 1);
info->num_counters = compat_tmp.num_counters;
sockptr_advance(arg, sizeof(compat_tmp));
offset = sizeof(compat_tmp);
} else
#endif
{
@ -1078,7 +1079,7 @@ void *xt_copy_counters(sockptr_t arg, unsigned int len,
if (copy_from_sockptr(info, arg, sizeof(*info)) != 0)
return ERR_PTR(-EFAULT);
sockptr_advance(arg, sizeof(*info));
offset = sizeof(*info);
}
info->name[sizeof(info->name) - 1] = '\0';
@ -1092,7 +1093,7 @@ void *xt_copy_counters(sockptr_t arg, unsigned int len,
if (!mem)
return ERR_PTR(-ENOMEM);
if (copy_from_sockptr(mem, arg, len) == 0)
if (copy_from_sockptr_offset(mem, arg, offset, len) == 0)
return mem;
vfree(mem);

6
net/tls/tls_main.c
View File

@ -522,9 +522,9 @@ static int do_tls_setsockopt_conf(struct sock *sk, sockptr_t optval,
goto err_crypto_info;
}
sockptr_advance(optval, sizeof(*crypto_info));
rc = copy_from_sockptr(crypto_info + 1, optval,
optlen - sizeof(*crypto_info));
rc = copy_from_sockptr_offset(crypto_info + 1, optval,
sizeof(*crypto_info),
optlen - sizeof(*crypto_info));
if (rc) {
rc = -EFAULT;
goto err_crypto_info;