diff options
| author | Matthew Garrett <mjg59@google.com> | 2018-01-08 22:36:19 +0100 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.vnet.ibm.com> | 2018-03-23 11:31:11 +0100 |
| commit | 3ec30113264a7bcd389f51d1738e42da0f41bb5a (patch) | |
| tree | 75a1465c8f53522dafcf2d41085c925cb025e29f /security/smack | |
| parent | Merge tag 'v4.16-rc6' into next-general (diff) | |
| download | linux-3ec30113264a7bcd389f51d1738e42da0f41bb5a.tar.xz linux-3ec30113264a7bcd389f51d1738e42da0f41bb5a.zip | |
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/smack')
| -rw-r--r-- | security/smack/smack_lsm.c | 18 |
1 files changed, 18 insertions, 0 deletions
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), |