On Fri, 2017-01-13 at 11:15 -0800, Nick Kralevich wrote:
> Unlike queue_remove(), queue_head() does not modify the queue, but
> rather, returns a pointer to an element within the queue. Freeing the
> memory associated with a value returned from that function corrupts
> subsequent users of the queue, who may try to reference this
> now-deallocated memory.
>
> This causes the following policy generation errors on Android:
>
> FAILED:
>
> out/target/product/bullhead/obj/ETC/plat_sepolicy.cil_intermediates/p
> lat_policy_nvr.cil
> /bin/bash -c "out/host/linux-x86/bin/checkpolicy -M -C -c 30 -o
>
> out/target/product/bullhead/obj/ETC/plat_sepolicy.cil_intermediates/p
> lat_policy_nvr.cil
>
> out/target/product/bullhead/obj/ETC/plat_sepolicy.cil_intermediates/p
> lat_policy.conf"
> system/sepolicy/public/app.te:241:ERROR 'only ioctl extended
> permissions
> are supported' at token ';' on line 6784:
> #line 241
> } };
> checkpolicy: error(s) encountered while parsing configuration
>
> because the value of "id" in:
>
> id = queue_remove(id_queue);
> if (strcmp(id,"ioctl") == 0) {
> ...
> } else {
> yyerror("only ioctl extended permissions are supported");
> ...
> }
>
> is now garbage.
>
> This is a partial revert of the following commit:
>
> c1ba8311 checkpolicy: free id where it was leaked
Thanks, applied.
>
> Signed-off-by: Nick Kralevich <[email protected]>
> ---
> checkpolicy/policy_define.c | 2 --
> 1 file changed, 2 deletions(-)
>
> diff --git a/checkpolicy/policy_define.c
> b/checkpolicy/policy_define.c
> index d158ad0..6bfadbe 100644
> --- a/checkpolicy/policy_define.c
> +++ b/checkpolicy/policy_define.c
> @@ -2012,7 +2012,6 @@ int define_te_avtab_xperms_helper(int which,
> avrule_t ** rule)
> (class_perm_node_t *)
> malloc(sizeof(class_perm_node_t));
> if (!cur_perms) {
> yyerror("out of memory");
> - free(id);
> ret = -1;
> goto out;
> }
> @@ -2048,7 +2047,6 @@ int define_te_avtab_xperms_helper(int which,
> avrule_t ** rule)
> }
> }
>
> - free(id);
> ebitmap_destroy(&tclasses);
>
> avrule->perms = perms;
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