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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>
71 lines
2.2 KiB
Diff
71 lines
2.2 KiB
Diff
From 825422c8d524f3500b7a09cda2cf39e28b4999ea 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 17:31:22 -0300
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Subject: [PATCH 09/11] ima: delete namespace policy securityfs file in
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write-once mode
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When policy file is written and write-once is enabled, the policy file
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must be deleted. Select the namespace policy structure to get the correct
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policy file descriptor.
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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 | 27 +++++++++++++++++++++++++--
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1 file changed, 25 insertions(+), 2 deletions(-)
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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 65c43e7..94e89fe 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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@@ -575,6 +575,7 @@ static int ima_open_policy(struct inode *inode, struct file *filp)
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static int ima_release_policy(struct inode *inode, struct file *file)
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{
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const char *cause = valid_policy ? "completed" : "failed";
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+ struct ima_ns_policy *ins;
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if ((file->f_flags & O_ACCMODE) == O_RDONLY)
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return seq_release(inode, file);
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@@ -595,15 +596,37 @@ static int ima_release_policy(struct inode *inode, struct file *file)
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return 0;
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}
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+ /* get the namespace id from file->inode (policy file inode).
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+ * We also need to synchronize this operation with concurrent namespace
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+ * releasing. */
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+ ima_namespace_lock();
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+ ins = ima_get_namespace_policy_from_inode(inode);
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+ if (!ins) {
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+ /* the namespace is not valid anymore, discard new policy
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+ * rules and exit */
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+ ima_delete_rules();
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+ valid_policy = 1;
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+ clear_bit(IMA_FS_BUSY, &ima_fs_flags);
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+ ima_namespace_unlock();
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+ return 0;
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+ }
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+
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ima_update_policy();
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#ifndef CONFIG_IMA_WRITE_POLICY
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- securityfs_remove(ima_policy_initial_ns);
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- ima_policy = NULL;
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+ if (ins == &ima_initial_namespace_policy) {
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+ securityfs_remove(ima_policy_initial_ns);
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+ ima_policy_initial_ns = NULL;
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+ } else {
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+ securityfs_remove(ins->policy_dentry);
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+ ins->policy_dentry = NULL;
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+ }
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#endif
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/* always clear the busy flag so other namespaces can use it */
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clear_bit(IMA_FS_BUSY, &ima_fs_flags);
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+ ima_namespace_unlock();
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+
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return 0;
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}
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--
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2.9.3
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