linux-kernel - [PATCH v11 24/27] ima: Show owning user namespace's uid and gid when displaying policy

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Message-Id: <20220302134703.1273041-25-stefanb@linux.ibm.com>
Date:   Wed,  2 Mar 2022 08:46:59 -0500
From:   Stefan Berger <stefanb@...ux.ibm.com>
To:     linux-integrity@...r.kernel.org
Cc:     zohar@...ux.ibm.com, serge@...lyn.com,
        christian.brauner@...ntu.com, containers@...ts.linux.dev,
        dmitry.kasatkin@...il.com, ebiederm@...ssion.com,
        krzysztof.struczynski@...wei.com, roberto.sassu@...wei.com,
        mpeters@...hat.com, lhinds@...hat.com, lsturman@...hat.com,
        puiterwi@...hat.com, jejb@...ux.ibm.com, jamjoom@...ibm.com,
        linux-kernel@...r.kernel.org, paul@...l-moore.com, rgb@...hat.com,
        linux-security-module@...r.kernel.org, jmorris@...ei.org,
        Stefan Berger <stefanb@...ux.ibm.com>
Subject: [PATCH v11 24/27] ima: Show owning user namespace's uid and gid when displaying policy

Show the uid and gid values relative to the user namespace that is
currently active. The effect of this changes is that when one displays
the policy from the user namespace that originally set the policy,
the same uid and gid values are shown in the policy as those that were
used when the policy was set.

Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com>

---
v9:
  - use seq_user_ns and from_k{g,u}id_munged()
---
 security/integrity/ima/ima_policy.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 50c7bdec5109..0f697a475882 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -2019,6 +2019,7 @@ static void ima_policy_show_appraise_algos(struct seq_file *m,
 
 int ima_policy_show(struct seq_file *m, void *v)
 {
+	struct user_namespace *user_ns = seq_user_ns(m);
 	struct ima_rule_entry *entry = v;
 	int i;
 	char tbuf[64] = {0,};
@@ -2104,7 +2105,8 @@ int ima_policy_show(struct seq_file *m, void *v)
 	}
 
 	if (entry->flags & IMA_UID) {
-		snprintf(tbuf, sizeof(tbuf), "%d", __kuid_val(entry->uid));
+		snprintf(tbuf, sizeof(tbuf),
+			 "%d", from_kuid_munged(user_ns, entry->uid));
 		if (entry->uid_op == &uid_gt)
 			seq_printf(m, pt(Opt_uid_gt), tbuf);
 		else if (entry->uid_op == &uid_lt)
@@ -2115,7 +2117,8 @@ int ima_policy_show(struct seq_file *m, void *v)
 	}
 
 	if (entry->flags & IMA_EUID) {
-		snprintf(tbuf, sizeof(tbuf), "%d", __kuid_val(entry->uid));
+		snprintf(tbuf, sizeof(tbuf),
+			 "%d", from_kuid_munged(user_ns, entry->uid));
 		if (entry->uid_op == &uid_gt)
 			seq_printf(m, pt(Opt_euid_gt), tbuf);
 		else if (entry->uid_op == &uid_lt)
@@ -2126,7 +2129,8 @@ int ima_policy_show(struct seq_file *m, void *v)
 	}
 
 	if (entry->flags & IMA_GID) {
-		snprintf(tbuf, sizeof(tbuf), "%d", __kgid_val(entry->gid));
+		snprintf(tbuf, sizeof(tbuf),
+			 "%d", from_kgid_munged(user_ns, entry->gid));
 		if (entry->gid_op == &gid_gt)
 			seq_printf(m, pt(Opt_gid_gt), tbuf);
 		else if (entry->gid_op == &gid_lt)
@@ -2137,7 +2141,8 @@ int ima_policy_show(struct seq_file *m, void *v)
 	}
 
 	if (entry->flags & IMA_EGID) {
-		snprintf(tbuf, sizeof(tbuf), "%d", __kgid_val(entry->gid));
+		snprintf(tbuf, sizeof(tbuf),
+			 "%d", from_kgid_munged(user_ns, entry->gid));
 		if (entry->gid_op == &gid_gt)
 			seq_printf(m, pt(Opt_egid_gt), tbuf);
 		else if (entry->gid_op == &gid_lt)
@@ -2148,7 +2153,8 @@ int ima_policy_show(struct seq_file *m, void *v)
 	}
 
 	if (entry->flags & IMA_FOWNER) {
-		snprintf(tbuf, sizeof(tbuf), "%d", __kuid_val(entry->fowner));
+		snprintf(tbuf, sizeof(tbuf),
+			 "%d", from_kuid_munged(user_ns, entry->fowner));
 		if (entry->fowner_op == &uid_gt)
 			seq_printf(m, pt(Opt_fowner_gt), tbuf);
 		else if (entry->fowner_op == &uid_lt)
@@ -2159,7 +2165,8 @@ int ima_policy_show(struct seq_file *m, void *v)
 	}
 
 	if (entry->flags & IMA_FGROUP) {
-		snprintf(tbuf, sizeof(tbuf), "%d", __kgid_val(entry->fgroup));
+		snprintf(tbuf, sizeof(tbuf),
+			 "%d", from_kgid_munged(user_ns, entry->fgroup));
 		if (entry->fgroup_op == &gid_gt)
 			seq_printf(m, pt(Opt_fgroup_gt), tbuf);
 		else if (entry->fgroup_op == &gid_lt)
-- 
2.31.1