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[213.175.37.10]) by smtp.gmail.com with ESMTPSA id b67sm278117wmc.38.2020.01.16.04.04.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Jan 2020 04:04:43 -0800 (PST) From: Ondrej Mosnacek To: selinux@vger.kernel.org, Paul Moore Cc: Stephen Smalley Subject: [PATCH 3/6] selinux: convert cond_list to array Date: Thu, 16 Jan 2020 13:04:36 +0100 Message-Id: <20200116120439.303034-4-omosnace@redhat.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200116120439.303034-1-omosnace@redhat.com> References: <20200116120439.303034-1-omosnace@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: selinux-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: selinux@vger.kernel.org Since it is fixed-size after allocation and we know the size beforehand, using a plain old array is simpler and more efficient. While there, also fix signedness of some related variables/parameters. Signed-off-by: Ondrej Mosnacek --- security/selinux/include/conditional.h | 6 +-- security/selinux/selinuxfs.c | 4 +- security/selinux/ss/conditional.c | 54 ++++++++++---------------- security/selinux/ss/conditional.h | 3 +- security/selinux/ss/policydb.c | 2 +- security/selinux/ss/policydb.h | 3 +- security/selinux/ss/services.c | 27 +++++++------ 7 files changed, 42 insertions(+), 57 deletions(-) diff --git a/security/selinux/include/conditional.h b/security/selinux/include/conditional.h index 0ab316f61da0..ffb9a33341f8 100644 --- a/security/selinux/include/conditional.h +++ b/security/selinux/include/conditional.h @@ -14,12 +14,12 @@ #include "security.h" int security_get_bools(struct selinux_state *state, - int *len, char ***names, int **values); + u32 *len, char ***names, int **values); int security_set_bools(struct selinux_state *state, - int len, int *values); + u32 len, int *values); int security_get_bool_value(struct selinux_state *state, - int index); + u32 index); #endif diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c index 79c710911a3c..296ce86e8b1f 100644 --- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -1327,14 +1327,14 @@ static void sel_remove_entries(struct dentry *de) static int sel_make_bools(struct selinux_fs_info *fsi) { - int i, ret; + int ret; ssize_t len; struct dentry *dentry = NULL; struct dentry *dir = fsi->bool_dir; struct inode *inode = NULL; struct inode_security_struct *isec; char **names = NULL, *page; - int num; + u32 i, num; int *values = NULL; u32 sid; diff --git a/security/selinux/ss/conditional.c b/security/selinux/ss/conditional.c index 04593062008d..c8a02c9b23ee 100644 --- a/security/selinux/ss/conditional.c +++ b/security/selinux/ss/conditional.c @@ -119,6 +119,7 @@ int cond_policydb_init(struct policydb *p) p->bool_val_to_struct = NULL; p->cond_list = NULL; + p->cond_list_len = 0; rc = avtab_init(&p->te_cond_avtab); if (rc) @@ -147,27 +148,22 @@ static void cond_node_destroy(struct cond_node *node) } cond_av_list_destroy(node->true_list); cond_av_list_destroy(node->false_list); - kfree(node); } -static void cond_list_destroy(struct cond_node *list) +static void cond_list_destroy(struct policydb *p) { - struct cond_node *next, *cur; + u32 i; - if (list == NULL) - return; - - for (cur = list; cur; cur = next) { - next = cur->next; - cond_node_destroy(cur); - } + for (i = 0; i < p->cond_list_len; i++) + cond_node_destroy(&p->cond_list[i]); + kfree(p->cond_list); } void cond_policydb_destroy(struct policydb *p) { kfree(p->bool_val_to_struct); avtab_destroy(&p->te_cond_avtab); - cond_list_destroy(p->cond_list); + cond_list_destroy(p); } int cond_init_bool_indexes(struct policydb *p) @@ -447,7 +443,6 @@ err: int cond_read_list(struct policydb *p, void *fp) { - struct cond_node *node, *last = NULL; __le32 buf[1]; u32 i, len; int rc; @@ -458,29 +453,24 @@ int cond_read_list(struct policydb *p, void *fp) len = le32_to_cpu(buf[0]); + p->cond_list = kcalloc(len, sizeof(*p->cond_list), GFP_KERNEL); + if (!p->cond_list) + return rc; + rc = avtab_alloc(&(p->te_cond_avtab), p->te_avtab.nel); if (rc) goto err; for (i = 0; i < len; i++) { - rc = -ENOMEM; - node = kzalloc(sizeof(*node), GFP_KERNEL); - if (!node) - goto err; - - rc = cond_read_node(p, node, fp); + rc = cond_read_node(p, &p->cond_list[i], fp); if (rc) goto err; - - if (i == 0) - p->cond_list = node; - else - last->next = node; - last = node; } + + p->cond_list_len = len; return 0; err: - cond_list_destroy(p->cond_list); + cond_list_destroy(p); p->cond_list = NULL; return rc; } @@ -585,23 +575,19 @@ static int cond_write_node(struct policydb *p, struct cond_node *node, return 0; } -int cond_write_list(struct policydb *p, struct cond_node *list, void *fp) +int cond_write_list(struct policydb *p, void *fp) { - struct cond_node *cur; - u32 len; + u32 i; __le32 buf[1]; int rc; - len = 0; - for (cur = list; cur != NULL; cur = cur->next) - len++; - buf[0] = cpu_to_le32(len); + buf[0] = cpu_to_le32(p->cond_list_len); rc = put_entry(buf, sizeof(u32), 1, fp); if (rc) return rc; - for (cur = list; cur != NULL; cur = cur->next) { - rc = cond_write_node(p, cur, fp); + for (i = 0; i < p->cond_list_len; i++) { + rc = cond_write_node(p, &p->cond_list[i], fp); if (rc) return rc; } diff --git a/security/selinux/ss/conditional.h b/security/selinux/ss/conditional.h index d86ef286ca84..e474bdd3a0ed 100644 --- a/security/selinux/ss/conditional.h +++ b/security/selinux/ss/conditional.h @@ -55,7 +55,6 @@ struct cond_node { struct cond_expr *expr; struct cond_av_list *true_list; struct cond_av_list *false_list; - struct cond_node *next; }; int cond_policydb_init(struct policydb *p); @@ -69,7 +68,7 @@ int cond_index_bool(void *key, void *datum, void *datap); int cond_read_bool(struct policydb *p, struct hashtab *h, void *fp); int cond_read_list(struct policydb *p, void *fp); int cond_write_bool(void *key, void *datum, void *ptr); -int cond_write_list(struct policydb *p, struct cond_node *list, void *fp); +int cond_write_list(struct policydb *p, void *fp); void cond_compute_av(struct avtab *ctab, struct avtab_key *key, struct av_decision *avd, struct extended_perms *xperms); diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c index e369b0092cdf..ef1718394dee 100644 --- a/security/selinux/ss/policydb.c +++ b/security/selinux/ss/policydb.c @@ -3483,7 +3483,7 @@ int policydb_write(struct policydb *p, void *fp) if (rc) return rc; - rc = cond_write_list(p, p->cond_list, fp); + rc = cond_write_list(p, fp); if (rc) return rc; diff --git a/security/selinux/ss/policydb.h b/security/selinux/ss/policydb.h index 69b24191fa38..6459616f8487 100644 --- a/security/selinux/ss/policydb.h +++ b/security/selinux/ss/policydb.h @@ -272,8 +272,9 @@ struct policydb { struct cond_bool_datum **bool_val_to_struct; /* type enforcement conditional access vectors and transitions */ struct avtab te_cond_avtab; - /* linked list indexing te_cond_avtab by conditional */ + /* array indexing te_cond_avtab by conditional */ struct cond_node *cond_list; + u32 cond_list_len; /* role allows */ struct role_allow *role_allow; diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index b9eda7d89e22..b0f71afcf4b8 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -2864,10 +2864,11 @@ out: } int security_get_bools(struct selinux_state *state, - int *len, char ***names, int **values) + u32 *len, char ***names, int **values) { struct policydb *policydb; - int i, rc; + u32 i; + int rc; if (!state->initialized) { *len = 0; @@ -2921,12 +2922,11 @@ err: } -int security_set_bools(struct selinux_state *state, int len, int *values) +int security_set_bools(struct selinux_state *state, u32 len, int *values) { struct policydb *policydb; - int i, rc; - int lenp, seqno = 0; - struct cond_node *cur; + int rc; + u32 i, lenp, seqno = 0; write_lock_irq(&state->ss->policy_rwlock); @@ -2954,8 +2954,8 @@ int security_set_bools(struct selinux_state *state, int len, int *values) policydb->bool_val_to_struct[i]->state = 0; } - for (cur = policydb->cond_list; cur; cur = cur->next) - evaluate_cond_node(policydb, cur); + for (i = 0; i < policydb->cond_list_len; i++) + evaluate_cond_node(policydb, &policydb->cond_list[i]); seqno = ++state->ss->latest_granting; rc = 0; @@ -2971,11 +2971,11 @@ out: } int security_get_bool_value(struct selinux_state *state, - int index) + u32 index) { struct policydb *policydb; int rc; - int len; + u32 len; read_lock(&state->ss->policy_rwlock); @@ -2996,8 +2996,7 @@ static void security_preserve_bools(struct policydb *oldpolicydb, struct policydb *newpolicydb) { struct cond_bool_datum *booldatum; - struct cond_node *cur; - int i; + u32 i; for (i = 0; i < oldpolicydb->p_bools.nprim; i++) { const char *name = sym_name(oldpolicydb, SYM_BOOLS, i); @@ -3007,8 +3006,8 @@ static void security_preserve_bools(struct policydb *oldpolicydb, if (booldatum) booldatum->state = value; } - for (cur = newpolicydb->cond_list; cur; cur = cur->next) - evaluate_cond_node(newpolicydb, cur); + for (i = 0; i < newpolicydb->cond_list_len; i++) + evaluate_cond_node(newpolicydb, &newpolicydb->cond_list[i]); } /* -- 2.24.1