[PATCH v11 14/27] userns: Add pointer to ima_namespace to user_namespace
From: Stefan Berger <stefanb@linux.ibm.com>
Date: 2022-03-02 13:52:41
Also in:
linux-integrity, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
Add a pointer to ima_namespace to the user_namespace and initialize the init_user_ns with a pointer to init_ima_ns. We need a pointer from the user namespace to its associated IMA namespace since IMA namespaces are piggybacking on user namespaces. Signed-off-by: Stefan Berger <stefanb@linux.ibm.com> Acked-by: Christian Brauner <brauner@kernel.org> Reviewed-by: Mimi Zohar <zohar@linux.ibm.com> --- v11: - Added lost A-b from Christian back - Added sentence to patch description explaining why we need the pointer v9: - Deferred implementation of ima_ns_from_user_ns() to later patch --- include/linux/ima.h | 2 ++ include/linux/user_namespace.h | 4 ++++ kernel/user.c | 4 ++++ 3 files changed, 10 insertions(+)
diff --git a/include/linux/ima.h b/include/linux/ima.h
index 426b1744215e..fcb60a44e05f 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h@@ -14,6 +14,8 @@ #include <crypto/hash_info.h> struct linux_binprm; +extern struct ima_namespace init_ima_ns; + #ifdef CONFIG_IMA extern enum hash_algo ima_get_current_hash_algo(void); extern int ima_bprm_check(struct linux_binprm *bprm);
diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
index 33a4240e6a6f..019e8cf7b633 100644
--- a/include/linux/user_namespace.h
+++ b/include/linux/user_namespace.h@@ -36,6 +36,7 @@ struct uid_gid_map { /* 64 bytes -- 1 cache line */ #define USERNS_INIT_FLAGS USERNS_SETGROUPS_ALLOWED struct ucounts; +struct ima_namespace; enum ucount_type { UCOUNT_USER_NAMESPACES,
@@ -99,6 +100,9 @@ struct user_namespace { #endif struct ucounts *ucounts; long ucount_max[UCOUNT_COUNTS]; +#ifdef CONFIG_IMA_NS + struct ima_namespace *ima_ns; +#endif } __randomize_layout; struct ucounts {
diff --git a/kernel/user.c b/kernel/user.c
index e2cf8c22b539..e5d1f4b9b8ba 100644
--- a/kernel/user.c
+++ b/kernel/user.c@@ -19,6 +19,7 @@ #include <linux/export.h> #include <linux/user_namespace.h> #include <linux/proc_ns.h> +#include <linux/ima.h> /* * userns count is 1 for root user, 1 for init_uts_ns,
@@ -67,6 +68,9 @@ struct user_namespace init_user_ns = { .keyring_name_list = LIST_HEAD_INIT(init_user_ns.keyring_name_list), .keyring_sem = __RWSEM_INITIALIZER(init_user_ns.keyring_sem), #endif +#ifdef CONFIG_IMA_NS + .ima_ns = &init_ima_ns, +#endif }; EXPORT_SYMBOL_GPL(init_user_ns);
--
2.31.1