On Tue, Mar 16, 2021 at 6:57 PM Nicolas Iooss <nicolas.iooss@xxxxxxx> wrote: > > Using signed integer to represent counts can troube some gcc > optimisation passes, for example in > https://github.com/fishilico/selinux/runs/2125501324?check_suite_focus=true#step:9:107 > > In function ‘name_list_to_string’, > inlined from ‘constraint_expr_to_string’ at module_to_cil.c:1799:11: > module_to_cil.c:1156:8: error: argument 1 range > [18446744071562067968, 18446744073709551615] exceeds maximum > object size 9223372036854775807 [-Werror=alloc-size-larger-than=] > 1156 | str = malloc(len); > | ^~~~~~~~~~~ > In file included from module_to_cil.c:39: > module_to_cil.c: In function ‘constraint_expr_to_string’: > /usr/include/stdlib.h:539:14: note: in a call to allocation > function ‘malloc’ declared here > 539 | extern void *malloc (size_t __size) __THROW __attribute_malloc__ > | ^~~~~~ > > The wide range (from 18446744071562067968 = 0xffffffff80000000 to > 18446744073709551615 = 0xffffffffffffffff) was caused by num_names being > a signed int used in "len += num_names;", even though it should always > be non-negative. > > Prevent such issues from occurring by using "unsigned int" where > appropriate. > > Signed-off-by: Nicolas Iooss <nicolas.iooss@xxxxxxx> I guess I don't need to make a patch. I thought you were just fixing the one function. This is exactly what I was thinking of. Acked-by: James Carter <jwcart2@xxxxxxxxx> > --- > libsepol/src/module_to_cil.c | 62 ++++++++++++++++++------------------ > 1 file changed, 31 insertions(+), 31 deletions(-) > > diff --git a/libsepol/src/module_to_cil.c b/libsepol/src/module_to_cil.c > index a87bc15e7610..cb1069caffdf 100644 > --- a/libsepol/src/module_to_cil.c > +++ b/libsepol/src/module_to_cil.c > @@ -717,9 +717,9 @@ exit: > return rc; > } > > -static int num_digits(int n) > +static unsigned int num_digits(unsigned int n) > { > - int num = 1; > + unsigned int num = 1; > while (n >= 10) { > n /= 10; > num++; > @@ -945,7 +945,7 @@ static char *search_attr_list(struct list *attr_list, int is_type, void *set) > return NULL; > } > > -static int set_to_names(struct policydb *pdb, int is_type, void *set, struct list *attr_list, char ***names, int *num_names) > +static int set_to_names(struct policydb *pdb, int is_type, void *set, struct list *attr_list, char ***names, unsigned int *num_names) > { > char *attr_name = NULL; > int rc = 0; > @@ -982,12 +982,12 @@ exit: > return rc; > } > > -static int ebitmap_to_names(struct ebitmap *map, char **vals_to_names, char ***names, int *num_names) > +static int ebitmap_to_names(struct ebitmap *map, char **vals_to_names, char ***names, unsigned int *num_names) > { > int rc = 0; > struct ebitmap_node *node; > uint32_t i; > - uint32_t num; > + unsigned int num; > char **name_arr; > > num = 0; > @@ -1026,7 +1026,7 @@ exit: > return rc; > } > > -static int process_roleset(struct policydb *pdb, struct role_set *rs, struct list *attr_list, char ***names, int *num_names) > +static int process_roleset(struct policydb *pdb, struct role_set *rs, struct list *attr_list, char ***names, unsigned int *num_names) > { > int rc = 0; > > @@ -1049,7 +1049,7 @@ exit: > return rc; > } > > -static int process_typeset(struct policydb *pdb, struct type_set *ts, struct list *attr_list, char ***names, int *num_names) > +static int process_typeset(struct policydb *pdb, struct type_set *ts, struct list *attr_list, char ***names, unsigned int *num_names) > { > int rc = 0; > > @@ -1072,7 +1072,7 @@ exit: > return rc; > } > > -static void names_destroy(char ***names, int *num_names) > +static void names_destroy(char ***names, unsigned int *num_names) > { > free(*names); > *names = NULL; > @@ -1083,7 +1083,7 @@ static int roletype_role_in_ancestor_to_cil(struct policydb *pdb, struct stack * > { > struct list_node *curr; > char **tnames = NULL; > - int num_tnames, i; > + unsigned int num_tnames, i; > struct role_list_node *role_node = NULL; > int rc; > struct type_set *ts; > @@ -1124,12 +1124,12 @@ exit: > } > > > -static int name_list_to_string(char **names, int num_names, char **string) > +static int name_list_to_string(char **names, unsigned int num_names, char **string) > { > // create a space separated string of the names > int rc = -1; > size_t len = 0; > - int i; > + unsigned int i; > char *str; > char *strpos; > > @@ -1184,7 +1184,7 @@ static int avrule_list_to_cil(int indent, struct policydb *pdb, struct avrule *a > struct avrule *avrule; > char **snames = NULL; > char **tnames = NULL; > - int s, t, num_snames, num_tnames; > + unsigned int s, t, num_snames, num_tnames; > struct type_set *ts; > > for (avrule = avrule_list; avrule != NULL; avrule = avrule->next) { > @@ -1257,7 +1257,7 @@ static int cond_expr_to_cil(int indent, struct policydb *pdb, struct cond_expr * > char *new_val = NULL; > char *val1 = NULL; > char *val2 = NULL; > - int num_params; > + unsigned int num_params; > const char *op; > const char *fmt_str; > const char *type; > @@ -1432,11 +1432,11 @@ static int role_trans_to_cil(int indent, struct policydb *pdb, struct role_trans > int rc = 0; > struct role_trans_rule *rule; > char **role_names = NULL; > - int num_role_names = 0; > - int role; > + unsigned int num_role_names = 0; > + unsigned int role; > char **type_names = NULL; > - int num_type_names = 0; > - int type; > + unsigned int num_type_names = 0; > + unsigned int type; > uint32_t i; > struct ebitmap_node *node; > struct type_set *ts; > @@ -1482,10 +1482,10 @@ static int role_allows_to_cil(int indent, struct policydb *pdb, struct role_allo > int rc = -1; > struct role_allow_rule *rule; > char **roles = NULL; > - int num_roles = 0; > + unsigned int num_roles = 0; > char **new_roles = NULL; > - int num_new_roles = 0; > - int i,j; > + unsigned int num_new_roles = 0; > + unsigned int i, j; > struct role_set *rs; > > for (rule = rules; rule != NULL; rule = rule->next) { > @@ -1525,11 +1525,11 @@ static int range_trans_to_cil(int indent, struct policydb *pdb, struct range_tra > int rc = -1; > struct range_trans_rule *rule; > char **stypes = NULL; > - int num_stypes = 0; > - int stype; > + unsigned int num_stypes = 0; > + unsigned int stype; > char **ttypes = NULL; > - int num_ttypes = 0; > - int ttype; > + unsigned int num_ttypes = 0; > + unsigned int ttype; > struct ebitmap_node *node; > uint32_t i; > struct type_set *ts; > @@ -1594,11 +1594,11 @@ static int filename_trans_to_cil(int indent, struct policydb *pdb, struct filena > { > int rc = -1; > char **stypes = NULL; > - int num_stypes = 0; > - int stype; > + unsigned int num_stypes = 0; > + unsigned int stype; > char **ttypes = NULL; > - int num_ttypes = 0; > - int ttype; > + unsigned int num_ttypes = 0; > + unsigned int ttype; > struct type_set *ts; > struct filename_trans_rule *rule; > > @@ -1716,7 +1716,7 @@ static int constraint_expr_to_string(struct policydb *pdb, struct constraint_exp > const char *attr2; > char *names = NULL; > char **name_list = NULL; > - int num_names = 0; > + unsigned int num_names = 0; > struct type_set *ts; > > rc = stack_init(&stack); > @@ -2090,9 +2090,9 @@ static int role_to_cil(int indent, struct policydb *pdb, struct avrule_block *UN > int rc = -1; > struct ebitmap_node *node; > uint32_t i; > - int j; > + unsigned int j; > char **types = NULL; > - int num_types = 0; > + unsigned int num_types = 0; > struct role_datum *role = datum; > struct type_set *ts; > struct list *attr_list = NULL; > -- > 2.31.0 >
