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authorMatthew Garrett <mjg59@google.com>2018-01-08 13:36:20 -0800
committerMimi Zohar <zohar@linux.vnet.ibm.com>2018-03-23 06:31:11 -0400
commitd906c10d8a31654cb9167c9a2ebc7d3e43820bad (patch)
treeb82b0c49a7d88ee82fc7f083a8bf62250e8164f9 /security/integrity/iint.c
parentsecurity: Add a cred_getsecid hook (diff)
downloadlinux-dev-d906c10d8a31654cb9167c9a2ebc7d3e43820bad.tar.xz
linux-dev-d906c10d8a31654cb9167c9a2ebc7d3e43820bad.zip
IMA: Support using new creds in appraisal policy
The existing BPRM_CHECK functionality in IMA validates against the credentials of the existing process, not any new credentials that the child process may transition to. Add an additional CREDS_CHECK target and refactor IMA to pass the appropriate creds structure. In ima_bprm_check(), check with both the existing process credentials and the credentials that will be committed when the new process is started. This will not change behaviour unless the system policy is extended to include CREDS_CHECK targets - BPRM_CHECK will continue to check the same credentials that it did previously. After this patch, an IMA policy rule along the lines of: measure func=CREDS_CHECK subj_type=unconfined_t will trigger if a process is executed and runs as unconfined_t, ignoring the context of the parent process. This is in contrast to: measure func=BPRM_CHECK subj_type=unconfined_t which will trigger if the process that calls exec() is already executing in unconfined_t, ignoring the context that the child process executes into. Signed-off-by: Matthew Garrett <mjg59@google.com> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com> Changelog: - initialize ima_creds_status
Diffstat (limited to 'security/integrity/iint.c')
-rw-r--r--security/integrity/iint.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/security/integrity/iint.c b/security/integrity/iint.c
index 9700e96ab0f0..f266e4b3b7d4 100644
--- a/security/integrity/iint.c
+++ b/security/integrity/iint.c
@@ -79,6 +79,7 @@ static void iint_free(struct integrity_iint_cache *iint)
iint->ima_mmap_status = INTEGRITY_UNKNOWN;
iint->ima_bprm_status = INTEGRITY_UNKNOWN;
iint->ima_read_status = INTEGRITY_UNKNOWN;
+ iint->ima_creds_status = INTEGRITY_UNKNOWN;
iint->evm_status = INTEGRITY_UNKNOWN;
iint->measured_pcrs = 0;
kmem_cache_free(iint_cache, iint);
@@ -158,6 +159,7 @@ static void init_once(void *foo)
iint->ima_mmap_status = INTEGRITY_UNKNOWN;
iint->ima_bprm_status = INTEGRITY_UNKNOWN;
iint->ima_read_status = INTEGRITY_UNKNOWN;
+ iint->ima_creds_status = INTEGRITY_UNKNOWN;
iint->evm_status = INTEGRITY_UNKNOWN;
mutex_init(&iint->mutex);
}