Bug 1330705

Summary: open() and openat() ignore 'mode' with O_TMPFILE on newer kernels
Product: Red Hat Enterprise Linux 7 Reporter: Jeff Bastian <jbastian>
Component: glibcAssignee: Florian Weimer <fweimer>
Status: CLOSED ERRATA QA Contact: Sergey Kolosov <skolosov>
Severity: medium Docs Contact:
Priority: medium    
Version: 7.2CC: ashankar, blc, bugproxy, chuhu, codonell, fweimer, hannsj_uhl, jcm, jfeeney, jstancek, mcermak, mnewsome, pfrankli, skolosov, yselkowi, zaitcev
Target Milestone: rcKeywords: Patch
Target Release: 7.4   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: glibc-2.17-160.el7 Doc Type: No Doc Update
Doc Text:
undefined
 Story Points: ---
Clone Of:
: 1375984 (view as bug list) Environment:
Last Closed: 2017-08-01 18:06:55 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On:    
Bug Blocks: 1299988, 1330740, 1358760, 1381083, 1413146    
Attachments:
Description Flags
reproducer and test program none

Description Jeff Bastian 2016-04-26 18:08:49 UTC 
Created attachment 1151054 [details]
reproducer and test program

Description of problem:
The RHEL Server for ARM kernel is based on upstream kernel-4.5.0, and this kernel adds a new O_TMPFILE flag to the open() and openat() syscalls.  glibc needs an update to support setting the file permissions when using O_TMPFILE without O_CREAT.  See upstream bug
  https://sourceware.org/bugzilla/show_bug.cgi?id=17523

Attached are two patches that (1) define O_TMPFILE and (2) update the open() and openat() syscall wrappers to support the mode.

Version-Release number of selected component (if applicable):
glibc-2.17-105.el7

How reproducible:
always

Steps to Reproduce:
1. on a 64-bit ARM system, compile and run the attached o_tmpfile.c test program

Actual results:
~]# ./a.out
/proc/self/fd/3 -> /root/#201425340 (deleted) file created with O_TMPFILE
/proc/self/fd/3 has mode 00
FAIL: mode is not 0600

Expected results:
~]# ./a.out
/proc/self/fd/3 -> /root/#201867825 (deleted) file created with O_TMPFILE
/proc/self/fd/3 has mode 0600

Additional info:
The problem was originally discovered by LTP's openat03 and open14 tests.  This is another method to reproduce and test the bug.
Comment 5 Florian Weimer 2016-09-14 12:20:30 UTC 
*** Bug 1375984 has been marked as a duplicate of this bug. ***
Comment 10 Florian Weimer 2016-09-20 19:08:13 UTC 
I posted a test case upstream:

  https://sourceware.org/ml/libc-alpha/2016-09/msg00341.html
Comment 17 Chunyu Hu 2016-10-19 11:41:42 UTC 
*** Bug 1386506 has been marked as a duplicate of this bug. ***
Comment 21 Florian Weimer 2017-05-20 07:25:07 UTC 
*** Bug 1451173 has been marked as a duplicate of this bug. ***
Comment 22 errata-xmlrpc 2017-08-01 18:06:55 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2017:1916