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[PATCH] ext3: Enable atomic inode security labeling

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This patch modifies ext3 to call the inode_init_security LSM hook to obtain
the security attribute for a newly created inode and to set the resulting
attribute on the new inode as part of the same transaction.  This parallels
the existing processing for setting ACLs on newly created inodes.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Stephen Smalley 2005-09-09 13:01:41 -07:00 committed by Linus Torvalds
parent 10f47e6a1b
commit ac50960afa
3 changed files with 38 additions and 0 deletions
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5
fs/ext3/ialloc.c
View File

@ -607,6 +607,11 @@ struct inode *ext3_new_inode(handle_t *handle, struct inode * dir, int mode)
DQUOT_DROP(inode);
goto fail2;
}
err = ext3_init_security(handle,inode, dir);
if (err) {
DQUOT_FREE_INODE(inode);
goto fail2;
}
err = ext3_mark_inode_dirty(handle, inode);
if (err) {
ext3_std_error(sb, err);

11
fs/ext3/xattr.h
View File

@ -133,3 +133,14 @@ exit_ext3_xattr(void)
#define ext3_xattr_handlers NULL
# endif /* CONFIG_EXT3_FS_XATTR */
#ifdef CONFIG_EXT3_FS_SECURITY
extern int ext3_init_security(handle_t *handle, struct inode *inode,
struct inode *dir);
#else
static inline int ext3_init_security(handle_t *handle, struct inode *inode,
struct inode *dir)
{
return 0;
}
#endif

22
fs/ext3/xattr_security.c
View File

@ -9,6 +9,7 @@
#include <linux/smp_lock.h>
#include <linux/ext3_jbd.h>
#include <linux/ext3_fs.h>
#include <linux/security.h>
#include "xattr.h"
static size_t
@ -47,6 +48,27 @@ ext3_xattr_security_set(struct inode *inode, const char *name,
value, size, flags);
}
int
ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir)
{
int err;
size_t len;
void *value;
char *name;
err = security_inode_init_security(inode, dir, &name, &value, &len);
if (err) {
if (err == -EOPNOTSUPP)
return 0;
return err;
}
err = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_SECURITY,
name, value, len, 0);
kfree(name);
kfree(value);
return err;
}
struct xattr_handler ext3_xattr_security_handler = {
.prefix = XATTR_SECURITY_PREFIX,
.list = ext3_xattr_security_list,