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Merge branch 'work.memdup_user' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 

Pull memdup_user() conversions from Al Viro:
 "A fairly self-contained series - hunting down open-coded memdup_user()
  and memdup_user_nul() instances"

* 'work.memdup_user' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  bpf: don't open-code memdup_user()
  kimage_file_prepare_segments(): don't open-code memdup_user()
  ethtool: don't open-code memdup_user()
  do_ip_setsockopt(): don't open-code memdup_user()
  do_ipv6_setsockopt(): don't open-code memdup_user()
  irda: don't open-code memdup_user()
  xfrm_user_policy(): don't open-code memdup_user()
  ima_write_policy(): don't open-code memdup_user_nul()
  sel_write_validatetrans(): don't open-code memdup_user_nul()
This commit is contained in:
Linus Torvalds 2017-07-05 16:05:24 -07:00
parent ea3b25e132 e4448ed87c
commit 7114f51fcb
7 changed files with 52 additions and 118 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
kernel/bpf/syscall.c
View File

@ -410,14 +410,11 @@ static int map_lookup_elem(union bpf_attr *attr)
if (IS_ERR(map))
return PTR_ERR(map);
err = -ENOMEM;
key = kmalloc(map->key_size, GFP_USER);
if (!key)
key = memdup_user(ukey, map->key_size);
if (IS_ERR(key)) {
err = PTR_ERR(key);
goto err_put;
err = -EFAULT;
if (copy_from_user(key, ukey, map->key_size) != 0)
goto free_key;
}
if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
@ -493,14 +490,11 @@ static int map_update_elem(union bpf_attr *attr)
if (IS_ERR(map))
return PTR_ERR(map);
err = -ENOMEM;
key = kmalloc(map->key_size, GFP_USER);
if (!key)
key = memdup_user(ukey, map->key_size);
if (IS_ERR(key)) {
err = PTR_ERR(key);
goto err_put;
err = -EFAULT;
if (copy_from_user(key, ukey, map->key_size) != 0)
goto free_key;
}
if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
@ -579,14 +573,11 @@ static int map_delete_elem(union bpf_attr *attr)
if (IS_ERR(map))
return PTR_ERR(map);
err = -ENOMEM;
key = kmalloc(map->key_size, GFP_USER);
if (!key)
key = memdup_user(ukey, map->key_size);
if (IS_ERR(key)) {
err = PTR_ERR(key);
goto err_put;
err = -EFAULT;
if (copy_from_user(key, ukey, map->key_size) != 0)
goto free_key;
}
preempt_disable();
__this_cpu_inc(bpf_prog_active);
@ -598,7 +589,6 @@ static int map_delete_elem(union bpf_attr *attr)
if (!err)
trace_bpf_map_delete_elem(map, ufd, key);
free_key:
kfree(key);
err_put:
fdput(f);
@ -627,14 +617,11 @@ static int map_get_next_key(union bpf_attr *attr)
return PTR_ERR(map);
if (ukey) {
err = -ENOMEM;
key = kmalloc(map->key_size, GFP_USER);
if (!key)
key = memdup_user(ukey, map->key_size);
if (IS_ERR(key)) {
err = PTR_ERR(key);
goto err_put;
err = -EFAULT;
if (copy_from_user(key, ukey, map->key_size) != 0)
goto free_key;
}
} else {
key = NULL;
}

14
kernel/kexec_file.c
View File

@ -162,16 +162,10 @@ kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd,
}
if (cmdline_len) {
image->cmdline_buf = kzalloc(cmdline_len, GFP_KERNEL);
if (!image->cmdline_buf) {
ret = -ENOMEM;
goto out;
}
ret = copy_from_user(image->cmdline_buf, cmdline_ptr,
cmdline_len);
if (ret) {
ret = -EFAULT;
image->cmdline_buf = memdup_user(cmdline_ptr, cmdline_len);
if (IS_ERR(image->cmdline_buf)) {
ret = PTR_ERR(image->cmdline_buf);
image->cmdline_buf = NULL;
goto out;
}

20
net/core/ethtool.c
View File

@ -2322,16 +2322,12 @@ static int ethtool_set_tunable(struct net_device *dev, void __user *useraddr)
ret = ethtool_tunable_valid(&tuna);
if (ret)
return ret;
data = kmalloc(tuna.len, GFP_USER);
if (!data)
return -ENOMEM;
useraddr += sizeof(tuna);
ret = -EFAULT;
if (copy_from_user(data, useraddr, tuna.len))
goto out;
data = memdup_user(useraddr, tuna.len);
if (IS_ERR(data))
return PTR_ERR(data);
ret = ops->set_tunable(dev, &tuna, data);
out:
kfree(data);
return ret;
}
@ -2507,18 +2503,14 @@ static int set_phy_tunable(struct net_device *dev, void __user *useraddr)
ret = ethtool_phy_tunable_valid(&tuna);
if (ret)
return ret;
data = kmalloc(tuna.len, GFP_USER);
if (!data)
return -ENOMEM;
useraddr += sizeof(tuna);
ret = -EFAULT;
if (copy_from_user(data, useraddr, tuna.len))
goto out;
data = memdup_user(useraddr, tuna.len);
if (IS_ERR(data))
return PTR_ERR(data);
mutex_lock(&phydev->lock);
ret = phydev->drv->set_tunable(phydev, &tuna, data);
mutex_unlock(&phydev->lock);
out:
kfree(data);
return ret;
}

20
net/ipv4/ip_sockglue.c
View File

@ -934,14 +934,9 @@ static int do_ip_setsockopt(struct sock *sk, int level,
err = -ENOBUFS;
break;
}
msf = kmalloc(optlen, GFP_KERNEL);
if (!msf) {
err = -ENOBUFS;
break;
}
err = -EFAULT;
if (copy_from_user(msf, optval, optlen)) {
kfree(msf);
msf = memdup_user(optval, optlen);
if (IS_ERR(msf)) {
err = PTR_ERR(msf);
break;
}
/* numsrc >= (1G-4) overflow in 32 bits */
@ -1090,14 +1085,11 @@ static int do_ip_setsockopt(struct sock *sk, int level,
err = -ENOBUFS;
break;
}
gsf = kmalloc(optlen, GFP_KERNEL);
if (!gsf) {
err = -ENOBUFS;
gsf = memdup_user(optval, optlen);
if (IS_ERR(gsf)) {
err = PTR_ERR(gsf);
break;
}
err = -EFAULT;
if (copy_from_user(gsf, optval, optlen))
goto mc_msf_out;
/* numsrc >= (4G-140)/128 overflow in 32 bits */
if (gsf->gf_numsrc >= 0x1ffffff ||

11
net/ipv6/ipv6_sockglue.c
View File

@ -735,14 +735,9 @@ done:
retv = -ENOBUFS;
break;
}
gsf = kmalloc(optlen, GFP_KERNEL);
if (!gsf) {
retv = -ENOBUFS;
break;
}
retv = -EFAULT;
if (copy_from_user(gsf, optval, optlen)) {
kfree(gsf);
gsf = memdup_user(optval, optlen);
if (IS_ERR(gsf)) {
retv = PTR_ERR(gsf);
break;
}
/* numsrc >= (4G-140)/128 overflow in 32 bits */

48
net/irda/af_irda.c
View File

@ -1901,16 +1901,10 @@ static int irda_setsockopt(struct socket *sock, int level, int optname,
goto out;
}
ias_opt = kmalloc(sizeof(struct irda_ias_set), GFP_ATOMIC);
if (ias_opt == NULL) {
err = -ENOMEM;
goto out;
}
/* Copy query to the driver. */
if (copy_from_user(ias_opt, optval, optlen)) {
kfree(ias_opt);
err = -EFAULT;
ias_opt = memdup_user(optval, optlen);
if (IS_ERR(ias_opt)) {
err = PTR_ERR(ias_opt);
goto out;
}
@ -2032,16 +2026,10 @@ static int irda_setsockopt(struct socket *sock, int level, int optname,
goto out;
}
ias_opt = kmalloc(sizeof(struct irda_ias_set), GFP_ATOMIC);
if (ias_opt == NULL) {
err = -ENOMEM;
goto out;
}
/* Copy query to the driver. */
if (copy_from_user(ias_opt, optval, optlen)) {
kfree(ias_opt);
err = -EFAULT;
ias_opt = memdup_user(optval, optlen);
if (IS_ERR(ias_opt)) {
err = PTR_ERR(ias_opt);
goto out;
}
@ -2317,16 +2305,10 @@ bed:
goto out;
}
ias_opt = kmalloc(sizeof(struct irda_ias_set), GFP_ATOMIC);
if (ias_opt == NULL) {
err = -ENOMEM;
goto out;
}
/* Copy query to the driver. */
if (copy_from_user(ias_opt, optval, len)) {
kfree(ias_opt);
err = -EFAULT;
ias_opt = memdup_user(optval, len);
if (IS_ERR(ias_opt)) {
err = PTR_ERR(ias_opt);
goto out;
}
@ -2381,16 +2363,10 @@ bed:
goto out;
}
ias_opt = kmalloc(sizeof(struct irda_ias_set), GFP_ATOMIC);
if (ias_opt == NULL) {
err = -ENOMEM;
goto out;
}
/* Copy query to the driver. */
if (copy_from_user(ias_opt, optval, len)) {
kfree(ias_opt);
err = -EFAULT;
ias_opt = memdup_user(optval, len);
if (IS_ERR(ias_opt)) {
err = PTR_ERR(ias_opt);
goto out;
}

12
security/selinux/selinuxfs.c
View File

@ -649,14 +649,12 @@ static ssize_t sel_write_validatetrans(struct file *file,
if (*ppos != 0)
goto out;
rc = -ENOMEM;
req = kzalloc(count + 1, GFP_KERNEL);
if (!req)
goto out;
rc = -EFAULT;
if (copy_from_user(req, buf, count))
req = memdup_user_nul(buf, count);
if (IS_ERR(req)) {
rc = PTR_ERR(req);
req = NULL;
goto out;
}
rc = -ENOMEM;
oldcon = kzalloc(count + 1, GFP_KERNEL);