[PATCH v2 04/10] ima: define "fs_unsafe" builtin policy
From: Mimi Zohar <hidden>
Date: 2017-06-21 18:19:56
Also in:
linux-fsdevel
Subsystem:
documentation, extended verification module (evm), integrity measurement architecture (ima), security subsystem, the rest · Maintainers:
Jonathan Corbet, Mimi Zohar, Roberto Sassu, Dmitry Kasatkin, Paul Moore, James Morris, "Serge E. Hallyn", Linus Torvalds
Permit normally denied access/execute permission for files in policy on IMA unsupported filesystems. This patch defines "fs_unsafe", a builtin policy. Mimi Zohar [off-list ref] --- Documentation/admin-guide/kernel-parameters.txt | 8 +++++++- security/integrity/ima/ima_policy.c | 2 ++ 2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index e438a1fca554..0aed01aabc16 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt@@ -1478,7 +1478,7 @@ ima_policy= [IMA] The builtin policies to load during IMA setup. - Format: "tcb | appraise_tcb | secure_boot" + Format: "tcb | appraise_tcb | secure_boot | fs_unsafe" The "tcb" policy measures all programs exec'd, files mmap'd for exec, and all files opened with the read
@@ -1493,6 +1493,12 @@ of files (eg. kexec kernel image, kernel modules, firmware, policy, etc) based on file signatures. + The "fs_unsafe" policy permits normally denied + access/execute permission for files in policy on IMA + unsupported filesystems. Note this option, as the + name implies, is not safe and not recommended for + any environments other than testing. + ima_tcb [IMA] Deprecated. Use ima_policy= instead. Load a policy which meets the needs of the Trusted Computing Base. This means IMA will measure all
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index cb92c9c04e80..4ff5640522c7 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c@@ -200,6 +200,8 @@ static int __init policy_setup(char *str) ima_use_appraise_tcb = 1; else if (strcmp(p, "secure_boot") == 0) ima_use_secure_boot = 1; + else if (strcmp(p, "fs_unsafe") == 0) + set_failsafe(0); } return 1;
--
2.7.4
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