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From "Miklos Szegedi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6852) [YARN-6223] Native code changes to support isolate GPU devices by using CGroups
Date Wed, 02 Aug 2017 23:53:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-6852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16111936#comment-16111936
] 

Miklos Szegedi commented on YARN-6852:
--------------------------------------

Thank you for the patch [~wangda]
We have now get_executable.c and cgroups-operations.c. It is up to you but I prefer cgroups_operations.c.
get_cgroups_path_to_write: This function could really use some comments
{{if (!cgroups_root || strlen(cgroups_root) == 0)}} How about {{if (!cgroups_root || cgroups_root[0]
== 0)}} it is more common.
{code}
sprintf(output_path, "%s/%s/%s/%s/%s.%s",
  cgroups_root, controller_name, yarn_hierarchy_name,
  group_id, controller_name, param_name);
{code}
Please use snprintf to avoid buffer overflow and potential security/reliability issues. Usually
the caller is supposed to send the max size as well. Also you need to handle snprintf.
config_initialized is not necessary/redundant. cgroup_cfg_section != NULL provides the same
meaning.
cgroup_cfg_section should be static as well.
To be accurate controller_name is actually hierarchy_name. There is subsystem (cpu) and hierarchy
(cpu,cpuacct).
Why do you have cgroup_cfg_section? You could eliminate it and get it all the time or just
cache cgroups_root.
update_cgroups_parameters needs function header comments as well.
update_cgroups_parameters: Pass in full_path size to get_cgroups_path_to_write otherwise it
may overflow the buffer on the stack(!) overwrite the return address to the buffer itself
and execute arbitrary code as root upon return. 😃
full_path should be allocated on the heap. It is quite big and may increase the likelihood
of stack overflows along with vulnerabilities like above.
continued...

> [YARN-6223] Native code changes to support isolate GPU devices by using CGroups
> -------------------------------------------------------------------------------
>
>                 Key: YARN-6852
>                 URL: https://issues.apache.org/jira/browse/YARN-6852
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Wangda Tan
>            Assignee: Wangda Tan
>         Attachments: YARN-6852.001.patch, YARN-6852.002.patch
>
>
> This JIRA plan to add support of:
> 1) Isolation in CGroups. (native side).



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