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HADOOP-10989. Work around buggy getgrouplist() implementations on Linux that return 0 on failure. Contributed by Chris Nauroth. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1619659 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Chris Nauroth 2014-08-22 04:05:18 +00:00
parent 7be2808347
commit b6c24472f3
2 changed files with 13 additions and 0 deletions
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3
hadoop-common-project/hadoop-common/CHANGES.txt
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@ -686,6 +686,9 @@ Release 2.6.0 - UNRELEASED
HADOOP-10488. TestKeyProviderFactory fails randomly. (tucu)
HADOOP-10989. Work around buggy getgrouplist() implementations on Linux that
return 0 on failure. (cnauroth)
Release 2.5.0 - 2014-08-11
INCOMPATIBLE CHANGES

10
hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/security/hadoop_user_info.c
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@ -193,7 +193,17 @@ int hadoop_user_info_getgroups(struct hadoop_user_info *uinfo)
ngroups = uinfo->gids_size;
ret = getgrouplist(uinfo->pwd.pw_name, uinfo->pwd.pw_gid,
uinfo->gids, &ngroups);
// Return value is different on Linux vs. FreeBSD. Linux: the number of groups
// or -1 on error. FreeBSD: 0 on success or -1 on error. Unfortunately, we
// can't accept a 0 return on Linux, because buggy implementations have been
// observed to return 0 but leave the other out parameters in an indeterminate
// state. This deviates from the man page, but it has been observed in
// practice. See issue HADOOP-10989 for details.
#ifdef __linux__
if (ret > 0) {
#else
if (ret >= 0) {
#endif
uinfo->num_gids = ngroups;
ret = put_primary_gid_first(uinfo);
if (ret) {