From 3ec30113264a7bcd389f51d1738e42da0f41bb5a Mon Sep 17 00:00:00 2001 From: Matthew Garrett Date: Mon, 8 Jan 2018 13:36:19 -0800 Subject: security: Add a cred_getsecid hook 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 Acked-by: Paul Moore Cc: Paul Moore Cc: Stephen Smalley Cc: Casey Schaufler Signed-off-by: Mimi Zohar --- include/linux/lsm_hooks.h | 6 ++++++ include/linux/security.h | 1 + 2 files changed, 7 insertions(+) (limited to 'include/linux') diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h index e0ac011d07a5..bbc6a1240b2e 100644 --- a/include/linux/lsm_hooks.h +++ b/include/linux/lsm_hooks.h @@ -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; diff --git a/include/linux/security.h b/include/linux/security.h index 3f5fd988ee87..116b8717a98c 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -324,6 +324,7 @@ int security_cred_alloc_blank(struct cred *cred, gfp_t gfp); void security_cred_free(struct cred *cred); int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp); void security_transfer_creds(struct cred *new, const struct cred *old); +void security_cred_getsecid(const struct cred *c, u32 *secid); int security_kernel_act_as(struct cred *new, u32 secid); int security_kernel_create_files_as(struct cred *new, struct inode *inode); int security_kernel_module_request(char *kmod_name); -- cgit v1.2.3