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selinuxfs snprintf() misuses

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a) %d does _not_ produce a page worth of output
b) snprintf() doesn't return negatives - it used to in old glibc, but
that's the kernel...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-04-02 19:40:47 -04:00
parent c862868bb4
commit cc1dad7183
1 changed files with 7 additions and 29 deletions
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36
security/selinux/selinuxfs.c
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@ -1259,12 +1259,8 @@ static int sel_make_bools(void)
if (!inode)
goto out;
ret = -EINVAL;
len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
if (len < 0)
goto out;
ret = -ENAMETOOLONG;
len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
if (len >= PAGE_SIZE)
goto out;
@ -1557,19 +1553,10 @@ static inline u32 sel_ino_to_perm(unsigned long ino)
static ssize_t sel_read_class(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
ssize_t rc, len;
char *page;
unsigned long ino = file->f_path.dentry->d_inode->i_ino;
page = (char *)__get_free_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
rc = simple_read_from_buffer(buf, count, ppos, page, len);
free_page((unsigned long)page);
return rc;
char res[TMPBUFLEN];
ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
return simple_read_from_buffer(buf, count, ppos, res, len);
}
static const struct file_operations sel_class_ops = {
@ -1580,19 +1567,10 @@ static const struct file_operations sel_class_ops = {
static ssize_t sel_read_perm(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
ssize_t rc, len;
char *page;
unsigned long ino = file->f_path.dentry->d_inode->i_ino;
page = (char *)__get_free_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
rc = simple_read_from_buffer(buf, count, ppos, page, len);
free_page((unsigned long)page);
return rc;
char res[TMPBUFLEN];
ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
return simple_read_from_buffer(buf, count, ppos, res, len);
}
static const struct file_operations sel_perm_ops = {