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https://issues.apache.org/jira/browse/YARN-7590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16546828#comment-16546828
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Eric Badger commented on YARN-7590:
-----------------------------------
Is your NM running as root?
{noformat}
if (caller_uid != info.st_uid) {
fprintf(LOGFILE, "Permission mismatch for %s for caller uid: %d, owner uid:
%d.\n", nm_root, caller_uid, info.st_uid);
return 1;
}
{noformat}
Looks like you're running into this error, and caller_uid is set to 0.
caller_uid is the first argument to check_nm_local_dir, which is always called
with nm_uid as its first argument. So to me that looks like the NM is being run
as root
> Improve container-executor validation check
> -------------------------------------------
>
> Key: YARN-7590
> URL: https://issues.apache.org/jira/browse/YARN-7590
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: security, yarn
> Affects Versions: 2.0.1-alpha, 2.2.0, 2.3.0, 2.4.0, 2.5.0, 2.6.0, 2.7.0,
> 2.8.0, 2.8.1, 3.0.0-beta1
> Reporter: Eric Yang
> Assignee: Eric Yang
> Priority: Major
> Fix For: 2.6.6, 3.1.0, 2.10.0, 2.9.1, 3.0.1, 2.8.4, 2.7.6
>
> Attachments: YARN-7590.001.patch, YARN-7590.002.patch,
> YARN-7590.003.patch, YARN-7590.004.patch, YARN-7590.005.patch,
> YARN-7590.006.patch, YARN-7590.007.patch, YARN-7590.008.patch,
> YARN-7590.009.patch, YARN-7590.010.patch, YARN-7590.branch-2.000.patch,
> YARN-7590.branch-2.6.000.patch, YARN-7590.branch-2.7.000.patch,
> YARN-7590.branch-2.8.000.patch, YARN-7590.branch-2.9.000.patch
>
>
> There is minimum check for prefix path for container-executor. If YARN is
> compromised, attacker can use container-executor to change system files
> ownership:
> {code}
> /usr/local/hadoop/bin/container-executor spark yarn 0 etc /home/yarn/tokens
> /home/spark / ls
> {code}
> This will change /etc to be owned by spark user:
> {code}
> # ls -ld /etc
> drwxr-s---. 110 spark hadoop 8192 Nov 21 20:00 /etc
> {code}
> Spark user can rewrite /etc files to gain more access. We can improve this
> with additional check in container-executor:
> # Make sure the prefix path is owned by the same user as the caller to
> container-executor.
> # Make sure the log directory prefix is owned by the same user as the caller.
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