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Security: Add hook to calculate context based on a negative dentry.

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There is a time where we need to calculate a context without the
inode having been created yet. To do this we take the negative dentry and
calculate a context based on the process and the parent directory contexts.

Acked-by: Eric Paris <eparis@redhat.com>
Acked-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Matthew N. Dodd <Matthew.Dodd@sparta.com>
Signed-off-by: Miguel Rodel Felipe <Rodel_FM@dsi.a-star.edu.sg>
Signed-off-by: Phua Eu Gene <PHUA_Eu_Gene@dsi.a-star.edu.sg>
Signed-off-by: Khin Mi Mi Aung <Mi_Mi_AUNG@dsi.a-star.edu.sg>
Signed-off-by: Steve Dickson <steved@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
David Quigley
2013-05-22 12:50:34 -04:00
committed by Trond Myklebust
parent 4488cc96c5
commit d47be3dfec
4 changed files with 80 additions and 0 deletions
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27
include/linux/security.h
View File

@@ -26,6 +26,7 @@
#include <linux/capability.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/string.h>
struct linux_binprm;
struct cred;
@@ -306,6 +307,15 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
* Parse a string of security data filling in the opts structure
* @options string containing all mount options known by the LSM
* @opts binary data structure usable by the LSM
* @dentry_init_security:
* Compute a context for a dentry as the inode is not yet available
* since NFSv4 has no label backed by an EA anyway.
* @dentry dentry to use in calculating the context.
* @mode mode used to determine resource type.
* @name name of the last path component used to create file
* @ctx pointer to place the pointer to the resulting context in.
* @ctxlen point to place the length of the resulting context.
*
*
* Security hooks for inode operations.
*
@@ -1443,6 +1453,10 @@ struct security_operations {
int (*sb_clone_mnt_opts) (const struct super_block *oldsb,
struct super_block *newsb);
int (*sb_parse_opts_str) (char *options, struct security_mnt_opts *opts);
int (*dentry_init_security) (struct dentry *dentry, int mode,
struct qstr *name, void **ctx,
u32 *ctxlen);
#ifdef CONFIG_SECURITY_PATH
int (*path_unlink) (struct path *dir, struct dentry *dentry);
@@ -1729,6 +1743,9 @@ int security_sb_set_mnt_opts(struct super_block *sb, struct security_mnt_opts *o
int security_sb_clone_mnt_opts(const struct super_block *oldsb,
struct super_block *newsb);
int security_sb_parse_opts_str(char *options, struct security_mnt_opts *opts);
int security_dentry_init_security(struct dentry *dentry, int mode,
struct qstr *name, void **ctx,
u32 *ctxlen);
int security_inode_alloc(struct inode *inode);
void security_inode_free(struct inode *inode);
@@ -2035,6 +2052,16 @@ static inline int security_inode_alloc(struct inode *inode)
static inline void security_inode_free(struct inode *inode)
{ }
static inline int security_dentry_init_security(struct dentry *dentry,
int mode,
struct qstr *name,
void **ctx,
u32 *ctxlen)
{
return -EOPNOTSUPP;
}
static inline int security_inode_init_security(struct inode *inode,
struct inode *dir,
const struct qstr *qstr,