Am Mo., 10. Mai 2021 um 13:21 Uhr schrieb liwugang <liwugang@xxxxxxx>:
>
> In the define_te_avtab_ioctl function:
> 1. the parameter avrule_template has been copies to
> new elements which added to avrule list through
> the function avrule_cpy, so it should free avrule_template.
> 2. And for rangelist, it does not free the allocated memory.
>
> The memory leak can by found by using memory sanitizer:
> =================================================================
> ==20021==ERROR: LeakSanitizer: detected memory leaks
>
> Direct leak of 10336 byte(s) in 76 object(s) allocated from:
> #0 0x7f8f96d9cb50 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb50)
> #1 0x55c2e9447fb3 in define_te_avtab_xperms_helper /mnt/sources/tools/selinux/checkpolicy/policy_define.c:2046
> #2 0x55c2e944a6ca in define_te_avtab_extended_perms /mnt/sources/tools/selinux/checkpolicy/policy_define.c:2479
> #3 0x55c2e943126b in yyparse /mnt/sources/tools/selinux/checkpolicy/policy_parse.y:494
> #4 0x55c2e9440221 in read_source_policy /mnt/sources/tools/selinux/checkpolicy/parse_util.c:64
> #5 0x55c2e945a3df in main /mnt/sources/tools/selinux/checkpolicy/checkpolicy.c:619
> #6 0x7f8f968eeb96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
>
> Direct leak of 240 byte(s) in 15 object(s) allocated from:
> #0 0x7f8f96d9cb50 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb50)
> #1 0x55c2e9446cd9 in avrule_sort_ioctls /mnt/sources/tools/selinux/checkpolicy/policy_define.c:1846
> #2 0x55c2e9447d8f in avrule_ioctl_ranges /mnt/sources/tools/selinux/checkpolicy/policy_define.c:2020
> #3 0x55c2e944a0de in define_te_avtab_ioctl /mnt/sources/tools/selinux/checkpolicy/policy_define.c:2409
> #4 0x55c2e944a744 in define_te_avtab_extended_perms /mnt/sources/tools/selinux/checkpolicy/policy_define.c:2485
> #5 0x55c2e94312bf in yyparse /mnt/sources/tools/selinux/checkpolicy/policy_parse.y:503
> #6 0x55c2e9440221 in read_source_policy /mnt/sources/tools/selinux/checkpolicy/parse_util.c:64
> #7 0x55c2e945a3df in main /mnt/sources/tools/selinux/checkpolicy/checkpolicy.c:619
> #8 0x7f8f968eeb96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
>
> Signed-off-by: liwugang <liwugang@xxxxxxx>
I am able to reproduce this leaks and this patch fixes them.
Tested-By: Christian Göttsche <cgzones@xxxxxxxxxxxxxx>
> ---
> checkpolicy/policy_define.c | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/checkpolicy/policy_define.c b/checkpolicy/policy_define.c
> index 16234f31..04064af2 100644
> --- a/checkpolicy/policy_define.c
> +++ b/checkpolicy/policy_define.c
> @@ -2400,7 +2400,7 @@ int avrule_cpy(avrule_t *dest, avrule_t *src)
> int define_te_avtab_ioctl(avrule_t *avrule_template)
> {
> avrule_t *avrule;
> - struct av_ioctl_range_list *rangelist;
> + struct av_ioctl_range_list *rangelist, *r, *r2;
> av_extended_perms_t *complete_driver, *partial_driver, *xperms;
> unsigned int i;
>
> @@ -2458,6 +2458,13 @@ done:
> if (partial_driver)
> free(partial_driver);
>
> + r = rangelist;
> + while (r != NULL) {
> + r2 = r;
> + r = r->next;
> + free(r2);
> + }
> +
> return 0;
> }
>
> @@ -2484,6 +2491,8 @@ int define_te_avtab_extended_perms(int which)
> free(id);
> if (define_te_avtab_ioctl(avrule_template))
> return -1;
> + avrule_destroy(avrule_template);
> + free(avrule_template);
> } else {
> yyerror("only ioctl extended permissions are supported");
> free(id);
> --
> 2.17.1
>
>
