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This is a project with a v1 of the IMA namespacing patches. See the readme for details on use. Signed-off-by: Tycho Andersen <tycho@docker.com>
62 lines
1.7 KiB
Diff
62 lines
1.7 KiB
Diff
From 0a3ac1bcf03b07940dff18ce29cd05ced91155c0 Mon Sep 17 00:00:00 2001
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From: Guilherme Magalhaes <guilherme.magalhaes@hpe.com>
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Date: Tue, 9 May 2017 17:19:57 -0300
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Subject: [PATCH 08/11] ima: block initial namespace id on the namespace policy
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interface
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The initial namespace policy is set through the existent interface
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in the ima/policy securityfs file. Block the initial namespace
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id when it is written to the ima/namespace securityfs file.
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Signed-off-by: Guilherme Magalhaes <guilherme.magalhaes@hpe.com>
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---
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security/integrity/ima/ima_fs.c | 18 ++++++++++++++++++
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1 file changed, 18 insertions(+)
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diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
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index 61f8da1..65c43e7 100644
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--- a/security/integrity/ima/ima_fs.c
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+++ b/security/integrity/ima/ima_fs.c
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@@ -365,6 +365,16 @@ static int check_mntns(unsigned int ns_id)
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return result;
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}
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+static unsigned int initial_mntns_id;
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+static void get_initial_mntns_id(void)
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+{
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+ struct ns_common *ns;
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+
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+ ns = mntns_operations.get(&init_task);
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+ initial_mntns_id = ns->inum;
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+ mntns_operations.put(ns);
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+}
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+
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/*
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* ima_find_namespace_id_from_inode
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* @policy_inode: the inode of the securityfs policy file for a given
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@@ -699,6 +709,12 @@ static ssize_t handle_new_namespace_policy(const char *data, size_t datalen)
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goto out;
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}
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+ if (ns_id == initial_mntns_id) {
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+ pr_err("IMA: invalid use of the initial mount namespace\n");
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+ result = -EINVAL;
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+ goto out;
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+ }
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+
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ima_namespace_lock();
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if (check_mntns(ns_id)) {
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result = -ENOENT;
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@@ -835,6 +851,8 @@ int __init ima_fs_init(void)
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&ima_namespaces_ops);
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if (IS_ERR(ima_namespaces))
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goto out;
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+
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+ get_initial_mntns_id();
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#endif
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return 0;
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--
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2.9.3
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