linux-kernel - [PATCH v2 1/2] selinux: dump statistics for more hash tables

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Date: Fri, 15 Mar 2024 19:14:05 +0100
From: Christian Göttsche <cgzones@...glemail.com>
To: selinux@...r.kernel.org
Cc: Paul Moore <paul@...l-moore.com>,
	Stephen Smalley <stephen.smalley.work@...il.com>,
	Ondrej Mosnacek <omosnace@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] selinux: dump statistics for more hash tables

Dump in the SELinux debug configuration the statistics for the
conditional rules avtab, the role transition, and class and common
permission hash tables.

Signed-off-by: Christian Göttsche <cgzones@...glemail.com>
---
v2:
   print key in hash_eval() for class and common tables
---
 security/selinux/ss/conditional.c |  3 +++
 security/selinux/ss/policydb.c    | 23 ++++++++++++++++-------
 2 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/security/selinux/ss/conditional.c b/security/selinux/ss/conditional.c
index f12476855b27..e868fc403d75 100644
--- a/security/selinux/ss/conditional.c
+++ b/security/selinux/ss/conditional.c
@@ -169,6 +169,9 @@ int cond_init_bool_indexes(struct policydb *p)
 		p->p_bools.nprim, sizeof(*p->bool_val_to_struct), GFP_KERNEL);
 	if (!p->bool_val_to_struct)
 		return -ENOMEM;
+
+	avtab_hash_eval(&p->te_cond_avtab, "conditional_rules");
+
 	return 0;
 }
 
diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
index 3d22d5baa829..b0f688fe0737 100644
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -672,14 +672,17 @@ static int (*const index_f[SYM_NUM])(void *key, void *datum, void *datap) = {
 /* clang-format on */
 
 #ifdef CONFIG_SECURITY_SELINUX_DEBUG
-static void hash_eval(struct hashtab *h, const char *hash_name)
+static void hash_eval(struct hashtab *h, const char *hash_name, const char *hash_details)
 {
 	struct hashtab_info info;
 
 	hashtab_stat(h, &info);
 	pr_debug(
-		"SELinux: %s:  %d entries and %d/%d buckets used, longest chain length %d, sum of chain length^2 %llu\n",
-		hash_name, h->nel, info.slots_used, h->size, info.max_chain_len,
+		"SELinux: %s%s%s:  %d entries and %d/%d buckets used, longest chain length %d, sum of chain length^2 %llu\n",
+		hash_name,
+		hash_details ? "@" : "",
+		hash_details ?: "",
+		h->nel, info.slots_used, h->size, info.max_chain_len,
 		info.chain2_len_sum);
 }
 
@@ -688,11 +691,11 @@ static void symtab_hash_eval(struct symtab *s)
 	int i;
 
 	for (i = 0; i < SYM_NUM; i++)
-		hash_eval(&s[i].table, symtab_name[i]);
+		hash_eval(&s[i].table, symtab_name[i], NULL);
 }
 
 #else
-static inline void hash_eval(struct hashtab *h, const char *hash_name)
+static inline void hash_eval(struct hashtab *h, const char *hash_name, const char *hash_details)
 {
 }
 static inline void symtab_hash_eval(struct symtab *s)
@@ -1178,6 +1181,8 @@ static int common_read(struct policydb *p, struct symtab *s, void *fp)
 			goto bad;
 	}
 
+	hash_eval(&comdatum->permissions.table, "common_permissions", key);
+
 	rc = symtab_insert(s, key, comdatum);
 	if (rc)
 		goto bad;
@@ -1358,6 +1363,8 @@ static int class_read(struct policydb *p, struct symtab *s, void *fp)
 			goto bad;
 	}
 
+	hash_eval(&cladatum->permissions.table, "class_permissions", key);
+
 	rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
 	if (rc)
 		goto bad;
@@ -1898,7 +1905,7 @@ static int range_read(struct policydb *p, void *fp)
 		rt = NULL;
 		r = NULL;
 	}
-	hash_eval(&p->range_tr, "rangetr");
+	hash_eval(&p->range_tr, "rangetr", NULL);
 	rc = 0;
 out:
 	kfree(rt);
@@ -2116,7 +2123,7 @@ static int filename_trans_read(struct policydb *p, void *fp)
 				return rc;
 		}
 	}
-	hash_eval(&p->filename_trans, "filenametr");
+	hash_eval(&p->filename_trans, "filenametr", NULL);
 	return 0;
 }
 
@@ -2649,6 +2656,8 @@ int policydb_read(struct policydb *p, void *fp)
 		rtd = NULL;
 	}
 
+	hash_eval(&p->role_tr, "roletr", NULL);
+
 	rc = next_entry(buf, fp, sizeof(u32));
 	if (rc)
 		goto bad;
-- 
2.43.0