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authorAl Viro <viro@zeniv.linux.org.uk>2015-12-24 00:06:05 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2016-01-04 10:26:58 -0500
commit16e5c1fc36040e592128a164499bc25eb138a80f (patch)
treea080bd2eea306d5815c5a9eefb46180e2bedffb2 /security/smack/smackfs.c
parent7e935c7ca1e6c398f11edac5beabfc4348e3b3a4 (diff)
downloadlinux-16e5c1fc36040e592128a164499bc25eb138a80f.tar.gz
convert a bunch of open-coded instances of memdup_user_nul()
A _lot_ of ->write() instances were open-coding it; some are converted to memdup_user_nul(), a lot more remain... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'security/smack/smackfs.c')
-rw-r--r--security/smack/smackfs.c114
1 files changed, 32 insertions, 82 deletions
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 94bd9e41c9ec..e249a66db533 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -497,14 +497,9 @@ static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
}
}
- data = kmalloc(count + 1, GFP_KERNEL);
- if (data == NULL)
- return -ENOMEM;
-
- if (copy_from_user(data, buf, count) != 0) {
- rc = -EFAULT;
- goto out;
- }
+ data = memdup_user_nul(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
/*
* In case of parsing only part of user buf,
@@ -884,16 +879,10 @@ static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
(count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
return -EINVAL;
- data = kzalloc(count + 1, GFP_KERNEL);
- if (data == NULL)
- return -ENOMEM;
-
- if (copy_from_user(data, buf, count) != 0) {
- rc = -EFAULT;
- goto unlockedout;
- }
+ data = memdup_user_nul(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
- data[count] = '\0';
rule = data;
/*
* Only allow one writer at a time. Writes should be
@@ -946,7 +935,6 @@ static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
out:
mutex_unlock(&smack_cipso_lock);
-unlockedout:
kfree(data);
return rc;
}
@@ -1187,14 +1175,9 @@ static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
if (count < SMK_NETLBLADDRMIN)
return -EINVAL;
- data = kzalloc(count + 1, GFP_KERNEL);
- if (data == NULL)
- return -ENOMEM;
-
- if (copy_from_user(data, buf, count) != 0) {
- rc = -EFAULT;
- goto free_data_out;
- }
+ data = memdup_user_nul(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
smack = kzalloc(count + 1, GFP_KERNEL);
if (smack == NULL) {
@@ -1202,8 +1185,6 @@ static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
goto free_data_out;
}
- data[count] = '\0';
-
rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
&host[0], &host[1], &host[2], &host[3], &masks, smack);
if (rc != 6) {
@@ -1454,14 +1435,9 @@ static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
if (count < SMK_NETLBLADDRMIN)
return -EINVAL;
- data = kzalloc(count + 1, GFP_KERNEL);
- if (data == NULL)
- return -ENOMEM;
-
- if (copy_from_user(data, buf, count) != 0) {
- rc = -EFAULT;
- goto free_data_out;
- }
+ data = memdup_user_nul(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
smack = kzalloc(count + 1, GFP_KERNEL);
if (smack == NULL) {
@@ -1469,8 +1445,6 @@ static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
goto free_data_out;
}
- data[count] = '\0';
-
i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
&scanned[0], &scanned[1], &scanned[2], &scanned[3],
&scanned[4], &scanned[5], &scanned[6], &scanned[7],
@@ -1865,14 +1839,9 @@ static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
- data = kzalloc(count + 1, GFP_KERNEL);
- if (data == NULL)
- return -ENOMEM;
-
- if (copy_from_user(data, buf, count) != 0) {
- rc = -EFAULT;
- goto out;
- }
+ data = memdup_user_nul(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
skp = smk_import_entry(data, count);
if (IS_ERR(skp)) {
@@ -2041,14 +2010,9 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
- data = kzalloc(count + 1, GFP_KERNEL);
- if (data == NULL)
- return -ENOMEM;
-
- if (copy_from_user(data, buf, count) != 0) {
- kfree(data);
- return -EFAULT;
- }
+ data = memdup_user_nul(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
rc = smk_parse_label_list(data, &list_tmp);
kfree(data);
@@ -2133,14 +2097,9 @@ static ssize_t smk_write_unconfined(struct file *file, const char __user *buf,
if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
- data = kzalloc(count + 1, GFP_KERNEL);
- if (data == NULL)
- return -ENOMEM;
-
- if (copy_from_user(data, buf, count) != 0) {
- rc = -EFAULT;
- goto freeout;
- }
+ data = memdup_user_nul(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
/*
* Clear the smack_unconfined on invalid label errors. This means
@@ -2696,19 +2655,15 @@ static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
if (!smack_privileged(CAP_MAC_ADMIN))
return -EPERM;
- data = kzalloc(count + 1, GFP_KERNEL);
- if (data == NULL)
- return -ENOMEM;
+ data = memdup_user_nul(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
- if (copy_from_user(data, buf, count) != 0)
- rc = -EFAULT;
- else {
- skp = smk_import_entry(data, count);
- if (IS_ERR(skp))
- rc = PTR_ERR(skp);
- else
- smack_syslog_label = skp;
- }
+ skp = smk_import_entry(data, count);
+ if (IS_ERR(skp))
+ rc = PTR_ERR(skp);
+ else
+ smack_syslog_label = skp;
kfree(data);
return rc;
@@ -2798,14 +2753,9 @@ static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
if (*ppos != 0)
return -EINVAL;
- data = kzalloc(count + 1, GFP_KERNEL);
- if (data == NULL)
- return -ENOMEM;
-
- if (copy_from_user(data, buf, count) != 0) {
- kfree(data);
- return -EFAULT;
- }
+ data = memdup_user_nul(buf, count);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
rc = smk_parse_label_list(data, &list_tmp);
kfree(data);