On 11/28/2016 04:34 PM, Nicolas Iooss wrote:
> A valid policy would not have two symbols (classes, roles, users...)
> sharing the same unique identifier. Make policydb_read() rejects such
> policy files.
>
> When ..._val_to_name translation tables were allocated with malloc(),
> change to calloc() in order to initialize the tables with NULLs.
>
> Signed-off-by: Nicolas Iooss <nicolas.iooss@xxxxxxx>
Thanks, applied both.
> ---
> libsepol/src/conditional.c | 3 +++
> libsepol/src/policydb.c | 27 ++++++++++++++++++++++-----
> 2 files changed, 25 insertions(+), 5 deletions(-)
>
> diff --git a/libsepol/src/conditional.c b/libsepol/src/conditional.c
> index e1bc961b2b52..2883aeb6fab0 100644
> --- a/libsepol/src/conditional.c
> +++ b/libsepol/src/conditional.c
> @@ -551,6 +551,9 @@ int cond_index_bool(hashtab_key_t key, hashtab_datum_t datum, void *datap)
> if (!booldatum->s.value || booldatum->s.value > p->p_bools.nprim)
> return -EINVAL;
>
> + if (p->p_bool_val_to_name[booldatum->s.value - 1] != NULL)
> + return -EINVAL;
> +
> p->p_bool_val_to_name[booldatum->s.value - 1] = key;
> p->bool_val_to_struct[booldatum->s.value - 1] = booldatum;
>
> diff --git a/libsepol/src/policydb.c b/libsepol/src/policydb.c
> index 26cdd9b13516..ed4bdc8c821e 100644
> --- a/libsepol/src/policydb.c
> +++ b/libsepol/src/policydb.c
> @@ -932,6 +932,8 @@ static int common_index(hashtab_key_t key, hashtab_datum_t datum, void *datap)
> p = (policydb_t *) datap;
> if (!comdatum->s.value || comdatum->s.value > p->p_commons.nprim)
> return -EINVAL;
> + if (p->p_common_val_to_name[comdatum->s.value - 1] != NULL)
> + return -EINVAL;
> p->p_common_val_to_name[comdatum->s.value - 1] = (char *)key;
>
> return 0;
> @@ -946,6 +948,8 @@ static int class_index(hashtab_key_t key, hashtab_datum_t datum, void *datap)
> p = (policydb_t *) datap;
> if (!cladatum->s.value || cladatum->s.value > p->p_classes.nprim)
> return -EINVAL;
> + if (p->p_class_val_to_name[cladatum->s.value - 1] != NULL)
> + return -EINVAL;
> p->p_class_val_to_name[cladatum->s.value - 1] = (char *)key;
> p->class_val_to_struct[cladatum->s.value - 1] = cladatum;
>
> @@ -961,6 +965,8 @@ static int role_index(hashtab_key_t key, hashtab_datum_t datum, void *datap)
> p = (policydb_t *) datap;
> if (!role->s.value || role->s.value > p->p_roles.nprim)
> return -EINVAL;
> + if (p->p_role_val_to_name[role->s.value - 1] != NULL)
> + return -EINVAL;
> p->p_role_val_to_name[role->s.value - 1] = (char *)key;
> p->role_val_to_struct[role->s.value - 1] = role;
>
> @@ -978,6 +984,8 @@ static int type_index(hashtab_key_t key, hashtab_datum_t datum, void *datap)
> if (typdatum->primary) {
> if (!typdatum->s.value || typdatum->s.value > p->p_types.nprim)
> return -EINVAL;
> + if (p->p_type_val_to_name[typdatum->s.value - 1] != NULL)
> + return -EINVAL;
> p->p_type_val_to_name[typdatum->s.value - 1] = (char *)key;
> p->type_val_to_struct[typdatum->s.value - 1] = typdatum;
> }
> @@ -995,7 +1003,8 @@ static int user_index(hashtab_key_t key, hashtab_datum_t datum, void *datap)
>
> if (!usrdatum->s.value || usrdatum->s.value > p->p_users.nprim)
> return -EINVAL;
> -
> + if (p->p_user_val_to_name[usrdatum->s.value - 1] != NULL)
> + return -EINVAL;
> p->p_user_val_to_name[usrdatum->s.value - 1] = (char *)key;
> p->user_val_to_struct[usrdatum->s.value - 1] = usrdatum;
>
> @@ -1014,6 +1023,8 @@ static int sens_index(hashtab_key_t key, hashtab_datum_t datum, void *datap)
> if (!levdatum->level->sens ||
> levdatum->level->sens > p->p_levels.nprim)
> return -EINVAL;
> + if (p->p_sens_val_to_name[levdatum->level->sens - 1] != NULL)
> + return -EINVAL;
> p->p_sens_val_to_name[levdatum->level->sens - 1] = (char *)key;
> }
>
> @@ -1031,6 +1042,8 @@ static int cat_index(hashtab_key_t key, hashtab_datum_t datum, void *datap)
> if (!catdatum->isalias) {
> if (!catdatum->s.value || catdatum->s.value > p->p_cats.nprim)
> return -EINVAL;
> + if (p->p_cat_val_to_name[catdatum->s.value - 1] != NULL)
> + return -EINVAL;
> p->p_cat_val_to_name[catdatum->s.value - 1] = (char *)key;
> }
>
> @@ -1051,7 +1064,7 @@ int policydb_index_classes(policydb_t * p)
> {
> free(p->p_common_val_to_name);
> p->p_common_val_to_name = (char **)
> - malloc(p->p_commons.nprim * sizeof(char *));
> + calloc(p->p_commons.nprim, sizeof(char *));
> if (!p->p_common_val_to_name)
> return -1;
>
> @@ -1060,13 +1073,13 @@ int policydb_index_classes(policydb_t * p)
>
> free(p->class_val_to_struct);
> p->class_val_to_struct = (class_datum_t **)
> - malloc(p->p_classes.nprim * sizeof(class_datum_t *));
> + calloc(p->p_classes.nprim, sizeof(class_datum_t *));
> if (!p->class_val_to_struct)
> return -1;
>
> free(p->p_class_val_to_name);
> p->p_class_val_to_name = (char **)
> - malloc(p->p_classes.nprim * sizeof(char *));
> + calloc(p->p_classes.nprim, sizeof(char *));
> if (!p->p_class_val_to_name)
> return -1;
>
> @@ -1082,7 +1095,7 @@ int policydb_index_bools(policydb_t * p)
> if (cond_init_bool_indexes(p) == -1)
> return -1;
> p->p_bool_val_to_name = (char **)
> - malloc(p->p_bools.nprim * sizeof(char *));
> + calloc(p->p_bools.nprim, sizeof(char *));
> if (!p->p_bool_val_to_name)
> return -1;
> if (hashtab_map(p->p_bools.table, cond_index_bool, p))
> @@ -1118,6 +1131,10 @@ int policydb_index_decls(sepol_handle_t * handle, policydb_t * p)
> ERR(handle, "invalid decl ID %u", decl->decl_id);
> return -1;
> }
> + if (p->decl_val_to_struct[decl->decl_id - 1] != NULL) {
> + ERR(handle, "duplicated decl ID %u", decl->decl_id);
> + return -1;
> + }
> p->decl_val_to_struct[decl->decl_id - 1] = decl;
> }
> }
>
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