apparmor: add lib fn to find the "split" for fqnames (3b0aaf58) · Commits · e / devices / android_kernel_fairphone_FP4

security/apparmor/include/lib.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -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 −0

Original line number	Diff line number	Diff line
		@@ -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