From e1491388d570a83f6b005d7dc1906765a02b922e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20G=C3=B6ttsche?= <cgzones@googlemail.com>
Date: Thu, 1 Jul 2021 20:06:45 +0200
Subject: [PATCH] libsepol: avoid implicit conversions
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Avoid implicit conversions from signed to unsigned values, found by
UB sanitizers, by using unsigned values in the first place.
expand.c:1644:18: runtime error: implicit conversion from type 'int' of value -1 (32-bit, signed) to type 'uint32_t' (aka 'unsigned int') changed the value to 4294967295 (32-bit, unsigned)
expand.c:2892:24: runtime error: implicit conversion from type 'int' of value -2 (32-bit, signed) to type 'unsigned int' changed the value to 4294967294 (32-bit, unsigned)
policy_define.c:2344:4: runtime error: implicit conversion from type 'int' of value -1048577 (32-bit, signed) to type 'unsigned int' changed the value to 4293918719 (32-bit, unsigned)
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
---
libsepol/include/sepol/policydb/conditional.h | 2 +-
libsepol/include/sepol/policydb/policydb.h | 6 +++---
libsepol/src/expand.c | 2 +-
3 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/libsepol/include/sepol/policydb/conditional.h b/libsepol/include/sepol/policydb/conditional.h
index 9c3df3ef488e..49c0d76631c4 100644
--- a/libsepol/include/sepol/policydb/conditional.h
+++ b/libsepol/include/sepol/policydb/conditional.h
@@ -90,7 +90,7 @@ typedef struct cond_node {
uint32_t expr_pre_comp;
struct cond_node *next;
/* a tunable conditional, calculated and used at expansion */
-#define COND_NODE_FLAGS_TUNABLE 0x01
+#define COND_NODE_FLAGS_TUNABLE UINT32_C(0x01)
uint32_t flags;
} cond_node_t;
diff --git a/libsepol/include/sepol/policydb/policydb.h b/libsepol/include/sepol/policydb/policydb.h
index 6976ef4831ef..4bf9f05ddd0a 100644
--- a/libsepol/include/sepol/policydb/policydb.h
+++ b/libsepol/include/sepol/policydb/policydb.h
@@ -251,9 +251,9 @@ typedef struct class_perm_node {
struct class_perm_node *next;
} class_perm_node_t;
-#define xperm_test(x, p) (1 & (p[x >> 5] >> (x & 0x1f)))
-#define xperm_set(x, p) (p[x >> 5] |= (1 << (x & 0x1f)))
-#define xperm_clear(x, p) (p[x >> 5] &= ~(1 << (x & 0x1f)))
+#define xperm_test(x, p) (UINT32_C(1) & (p[x >> 5] >> (x & 0x1f)))
+#define xperm_set(x, p) (p[x >> 5] |= (UINT32_C(1) << (x & 0x1f)))
+#define xperm_clear(x, p) (p[x >> 5] &= ~(UINT32_C(1) << (x & 0x1f)))
#define EXTENDED_PERMS_LEN 8
typedef struct av_extended_perms {
diff --git a/libsepol/src/expand.c b/libsepol/src/expand.c
index 84bfcfa36d0a..aac5b35f7bd1 100644
--- a/libsepol/src/expand.c
+++ b/libsepol/src/expand.c
@@ -1641,7 +1641,7 @@ static avtab_ptr_t find_avtab_node(sepol_handle_t * handle,
* AUDITDENY, aka DONTAUDIT, are &= assigned, versus |= for
* others. Initialize the data accordingly.
*/
- avdatum.data = key->specified == AVTAB_AUDITDENY ? ~0 : 0;
+ avdatum.data = key->specified == AVTAB_AUDITDENY ? ~UINT32_C(0) : UINT32_C(0);
/* this is used to get the node - insertion is actually unique */
node = avtab_insert_nonunique(avtab, key, &avdatum);
if (!node) {
--
2.32.0