diff options
| -rw-r--r-- | security/smack/smackfs.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c index 5d44b7d258ef..22ded2c26089 100644 --- a/security/smack/smackfs.c +++ b/security/smack/smackfs.c @@ -1167,7 +1167,7 @@ static ssize_t smk_write_net4addr(struct file *file, const char __user *buf, return -EPERM; if (*ppos != 0) return -EINVAL; - if (count < SMK_NETLBLADDRMIN) + if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1) return -EINVAL; data = memdup_user_nul(buf, count); @@ -1427,7 +1427,7 @@ static ssize_t smk_write_net6addr(struct file *file, const char __user *buf, return -EPERM; if (*ppos != 0) return -EINVAL; - if (count < SMK_NETLBLADDRMIN) + if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1) return -EINVAL; data = memdup_user_nul(buf, count); @@ -1834,6 +1834,10 @@ static ssize_t smk_write_ambient(struct file *file, const char __user *buf, if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; + /* Enough data must be present */ + if (count == 0 || count > PAGE_SIZE) + return -EINVAL; + data = memdup_user_nul(buf, count); if (IS_ERR(data)) return PTR_ERR(data); @@ -2005,6 +2009,9 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; + if (count > PAGE_SIZE) + return -EINVAL; + data = memdup_user_nul(buf, count); if (IS_ERR(data)) return PTR_ERR(data); @@ -2092,6 +2099,9 @@ static ssize_t smk_write_unconfined(struct file *file, const char __user *buf, if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; + if (count > PAGE_SIZE) + return -EINVAL; + data = memdup_user_nul(buf, count); if (IS_ERR(data)) return PTR_ERR(data); @@ -2648,6 +2658,10 @@ static ssize_t smk_write_syslog(struct file *file, const char __user *buf, if (!smack_privileged(CAP_MAC_ADMIN)) return -EPERM; + /* Enough data must be present */ + if (count == 0 || count > PAGE_SIZE) + return -EINVAL; + data = memdup_user_nul(buf, count); if (IS_ERR(data)) return PTR_ERR(data); @@ -2740,10 +2754,13 @@ static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf, return -EPERM; /* + * No partial write. * Enough data must be present. */ if (*ppos != 0) return -EINVAL; + if (count == 0 || count > PAGE_SIZE) + return -EINVAL; data = memdup_user_nul(buf, count); if (IS_ERR(data)) |