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apparmor: add lib fn to find the "split" for fqnames

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Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
John Johansen 2017-01-16 00:42:23 -08:00
parent 9a2d40c12d
commit 3b0aaf5866
2 changed files with 55 additions and 0 deletions
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2
security/apparmor/include/lib.h
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@ -38,6 +38,8 @@ extern int apparmor_initialized __initdata;
/* fn's in lib */
char *aa_split_fqname(char *args, char **ns_name);
const char *aa_splitn_fqname(const char *fqname, size_t n, const char **ns_name,
size_t *ns_len);
void aa_info_message(const char *str);
void *__aa_kvmalloc(size_t size, gfp_t flags);

53
security/apparmor/lib.c
View File

@ -12,6 +12,7 @@
* License.
*/
#include <linux/ctype.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/string.h>
@ -60,6 +61,58 @@ char *aa_split_fqname(char *fqname, char **ns_name)
return name;
}
/**
* skipn_spaces - Removes leading whitespace from @str.
* @str: The string to be stripped.
*
* Returns a pointer to the first non-whitespace character in @str.
* if all whitespace will return NULL
*/
static const char *skipn_spaces(const char *str, size_t n)
{
for (; n && isspace(*str); --n)
++str;
if (n)
return (char *)str;
return NULL;
}
const char *aa_splitn_fqname(const char *fqname, size_t n, const char **ns_name,
size_t *ns_len)
{
const char *end = fqname + n;
const char *name = skipn_spaces(fqname, n);
if (!name)
return NULL;
*ns_name = NULL;
*ns_len = 0;
if (name[0] == ':') {
char *split = strnchr(&name[1], end - &name[1], ':');
*ns_name = skipn_spaces(&name[1], end - &name[1]);
if (!*ns_name)
return NULL;
if (split) {
*ns_len = split - *ns_name;
if (*ns_len == 0)
*ns_name = NULL;
split++;
if (end - split > 1 && strncmp(split, "//", 2) == 0)
split += 2;
name = skipn_spaces(split, end - split);
} else {
/* a ns name without a following profile is allowed */
name = NULL;
*ns_len = end - *ns_name;
}
}
if (name && *name == 0)
name = NULL;
return name;
}
/**
* aa_info_message - log a none profile related status message
* @str: message to log