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authorMatthew Garrett <mjg59@google.com>2018-01-08 13:36:19 -0800
committerMimi Zohar <zohar@linux.vnet.ibm.com>2018-03-23 06:31:11 -0400
commit3ec30113264a7bcd389f51d1738e42da0f41bb5a (patch)
tree75a1465c8f53522dafcf2d41085c925cb025e29f /security
parent5893ed18a26d1f56b97c0290b0cbbc2d49d6de28 (diff)
downloadlinux-stericsson-3ec30113264a7bcd389f51d1738e42da0f41bb5a.tar.gz
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 <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>
Diffstat (limited to 'security')
-rw-r--r--security/security.c7
-rw-r--r--security/selinux/hooks.c6
-rw-r--r--security/smack/smack_lsm.c18
3 files changed, 31 insertions, 0 deletions
diff --git a/security/security.c b/security/security.c
index 14c291910d25..957e8bee3554 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1005,6 +1005,13 @@ void security_transfer_creds(struct cred *new, const struct cred *old)
call_void_hook(cred_transfer, new, old);
}
+void security_cred_getsecid(const struct cred *c, u32 *secid)
+{
+ *secid = 0;
+ call_void_hook(cred_getsecid, c, secid);
+}
+EXPORT_SYMBOL(security_cred_getsecid);
+
int security_kernel_act_as(struct cred *new, u32 secid)
{
return call_int_hook(kernel_act_as, 0, new, secid);
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 8abd542c6b7c..b7d4473edbde 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3844,6 +3844,11 @@ static void selinux_cred_transfer(struct cred *new, const struct cred *old)
*tsec = *old_tsec;
}
+static void selinux_cred_getsecid(const struct cred *c, u32 *secid)
+{
+ *secid = cred_sid(c);
+}
+
/*
* set the security data for a kernel service
* - all the creation contexts are set to unlabelled
@@ -6482,6 +6487,7 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(cred_free, selinux_cred_free),
LSM_HOOK_INIT(cred_prepare, selinux_cred_prepare),
LSM_HOOK_INIT(cred_transfer, selinux_cred_transfer),
+ LSM_HOOK_INIT(cred_getsecid, selinux_cred_getsecid),
LSM_HOOK_INIT(kernel_act_as, selinux_kernel_act_as),
LSM_HOOK_INIT(kernel_create_files_as, selinux_kernel_create_files_as),
LSM_HOOK_INIT(kernel_module_request, selinux_kernel_module_request),
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index feada2665322..ed20d36c1149 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -2050,6 +2050,23 @@ static void smack_cred_transfer(struct cred *new, const struct cred *old)
}
/**
+ * smack_cred_getsecid - get the secid corresponding to a creds structure
+ * @c: the object creds
+ * @secid: where to put the result
+ *
+ * Sets the secid to contain a u32 version of the smack label.
+ */
+static void smack_cred_getsecid(const struct cred *c, u32 *secid)
+{
+ struct smack_known *skp;
+
+ rcu_read_lock();
+ skp = smk_of_task(c->security);
+ *secid = skp->smk_secid;
+ rcu_read_unlock();
+}
+
+/**
* smack_kernel_act_as - Set the subjective context in a set of credentials
* @new: points to the set of credentials to be modified.
* @secid: specifies the security ID to be set
@@ -4733,6 +4750,7 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(cred_free, smack_cred_free),
LSM_HOOK_INIT(cred_prepare, smack_cred_prepare),
LSM_HOOK_INIT(cred_transfer, smack_cred_transfer),
+ LSM_HOOK_INIT(cred_getsecid, smack_cred_getsecid),
LSM_HOOK_INIT(kernel_act_as, smack_kernel_act_as),
LSM_HOOK_INIT(kernel_create_files_as, smack_kernel_create_files_as),
LSM_HOOK_INIT(task_setpgid, smack_task_setpgid),