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apparmor: add kvzalloc to handle zeroing for kvmalloc

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Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Steve Beattie <sbeattie@ubuntu.com>
This commit is contained in:
John Johansen 2013-02-18 16:04:34 -08:00
parent 3cfcc19e0b
commit 0ca554b9fc
3 changed files with 22 additions and 8 deletions
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12
security/apparmor/include/apparmor.h
View File

@ -15,6 +15,7 @@
#ifndef __APPARMOR_H
#define __APPARMOR_H
#include <linux/slab.h>
#include <linux/fs.h>
#include "match.h"
@ -64,9 +65,18 @@ extern int apparmor_initialized __initdata;
/* fn's in lib */
char *aa_split_fqname(char *args, char **ns_name);
void aa_info_message(const char *str);
void *kvmalloc(size_t size);
void *__aa_kvmalloc(size_t size, gfp_t flags);
void kvfree(void *buffer);
static inline void *kvmalloc(size_t size)
{
return __aa_kvmalloc(size, 0);
}
static inline void *kvzalloc(size_t size)
{
return __aa_kvmalloc(size, __GFP_ZERO);
}
/**
* aa_strneq - compare null terminated @str to a non null terminated substring

14
security/apparmor/lib.c
View File

@ -75,15 +75,16 @@ void aa_info_message(const char *str)
}
/**
* kvmalloc - do allocation preferring kmalloc but falling back to vmalloc
* @size: size of allocation
* __aa_kvmalloc - do allocation preferring kmalloc but falling back to vmalloc
* @size: how many bytes of memory are required
* @flags: the type of memory to allocate (see kmalloc).
*
* Return: allocated buffer or NULL if failed
*
* It is possible that policy being loaded from the user is larger than
* what can be allocated by kmalloc, in those cases fall back to vmalloc.
*/
void *kvmalloc(size_t size)
void *__aa_kvmalloc(size_t size, gfp_t flags)
{
void *buffer = NULL;
@ -92,14 +93,17 @@ void *kvmalloc(size_t size)
/* do not attempt kmalloc if we need more than 16 pages at once */
if (size <= (16*PAGE_SIZE))
buffer = kmalloc(size, GFP_NOIO | __GFP_NOWARN);
buffer = kmalloc(size, flags | GFP_NOIO | __GFP_NOWARN);
if (!buffer) {
/* see kvfree for why size must be at least work_struct size
* when allocated via vmalloc
*/
if (size < sizeof(struct work_struct))
size = sizeof(struct work_struct);
buffer = vmalloc(size);
if (flags & __GFP_ZERO)
buffer = vzalloc(size);
else
buffer = vmalloc(size);
}
return buffer;
}

4
security/apparmor/match.c
View File

@ -30,7 +30,7 @@
*
* Returns: pointer to table else NULL on failure
*
* NOTE: must be freed by kvfree (not kmalloc)
* NOTE: must be freed by kvfree (not kfree)
*/
static struct table_header *unpack_table(char *blob, size_t bsize)
{
@ -57,7 +57,7 @@ static struct table_header *unpack_table(char *blob, size_t bsize)
if (bsize < tsize)
goto out;
table = kvmalloc(tsize);
table = kvzalloc(tsize);
if (table) {
*table = th;
if (th.td_flags == YYTD_DATA8)