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security: Add a cred_getsecid hook

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For IMA purposes, we want to be able to obtain the prepared secid in the
bprm structure before the credentials are committed. Add a cred_getsecid
hook that makes this possible.

Signed-off-by: Matthew Garrett <mjg59@google.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
This commit is contained in:
Matthew Garrett 2018-01-08 13:36:19 -08:00 • committed by Mimi Zohar
parent 5893ed18a2
commit 3ec3011326
5 changed files with 38 additions and 0 deletions
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6
include/linux/lsm_hooks.h
View file

@ -554,6 +554,10 @@
* @new points to the new credentials.
* @old points to the original credentials.
* Transfer data from original creds to new creds
* @cred_getsecid:
* Retrieve the security identifier of the cred structure @c
* @c contains the credentials, secid will be placed into @secid.
* In case of failure, @secid will be set to zero.
* @kernel_act_as:
* Set the credentials for a kernel service to act as (subjective context).
* @new points to the credentials to be modified.
@ -1542,6 +1546,7 @@ union security_list_options {
int (*cred_prepare)(struct cred *new, const struct cred *old,
gfp_t gfp);
void (*cred_transfer)(struct cred *new, const struct cred *old);
void (*cred_getsecid)(const struct cred *c, u32 *secid);
int (*kernel_act_as)(struct cred *new, u32 secid);
int (*kernel_create_files_as)(struct cred *new, struct inode *inode);
int (*kernel_module_request)(char *kmod_name);
@ -1825,6 +1830,7 @@ struct security_hook_heads {
struct list_head cred_free;
struct list_head cred_prepare;
struct list_head cred_transfer;
struct list_head cred_getsecid;
struct list_head kernel_act_as;
struct list_head kernel_create_files_as;
struct list_head kernel_read_file;