RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1243234 - exportfs: code defect, when export path length > 986, buffer overflow.
Summary: exportfs: code defect, when export path length > 986, buffer overflow.
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: nfs-utils
Version: 7.2
Hardware: All
OS: Linux
unspecified
high
Target Milestone: rc
: ---
Assignee: Steve Dickson
QA Contact: Yongcheng Yang
URL:
Whiteboard:
Depends On:
Blocks: 1276188
TreeView+ depends on / blocked
 
Reported: 2015-07-15 03:27 UTC by JianHong Yin
Modified: 2016-11-04 05:00 UTC (History)
3 users (show)

Fixed In Version: nfs-utils-1.3.0-0.25.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
: 1276188 (view as bug list)
Environment:
Last Closed: 2016-11-04 05:00:04 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
fix patch (1.92 KB, patch)
2015-07-15 03:27 UTC, JianHong Yin 		no flags Details | Diff
View All


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2016:2383 0 normal SHIPPED_LIVE nfs-utils bug fix and enhancement update 2016-11-03 13:53:02 UTC

Description JianHong Yin 2015-07-15 03:27:30 UTC 
Created attachment 1052169 [details]
fix patch

Description of problem:
exportfs: code defect, when export path length > 986, buffer overflow,
Got a error message:
  exportfs: $path... does not support NFS export

Version-Release number of selected component (if applicable):
all version

How reproducible:
always

Steps to Reproduce:
1. mkdir -p [a long path that length > 986]
2. exportfs -i $path

Actual results:
exportfs: /1_2_3_4_5_6_7_8_9_10_11_12_13_14_15_16_17_18_19_20_21_22_23_24_25_26_27_28_29_30_31_32_33_34_35_36_37_38_39_40_41_42_43_44_45_46_47_48_49_50_51_52_53_54_55_56_57_58_59_60_61_62_63_64_65_66_67_68_69_70_71_72_73_74_75_76_77_78_79_80_81_82_83_84_85_86_87_88/1_2_3_4_5_6_7_8_9_10_11_12_13_14_15_16_17_18_19_20_21_22_23_24_25_26_27_28_29_30_31_32_33_34_35_36_37_38_39_40_41_42_43_44_45_46_47_48_49_50_51_52_53_54_55_56_57_58_59_60_61_62_63_64_65_66_67_68_69_70_71_72_73_74_75_76_77_78_79_80_81_82_83_84_85_86_87_88/1_2_3_4_5_6_7_8_9_10_11_12_13_14_15_16_17_18_19_20_21_22_23_24_25_26_27_28_29_30_31_32_33_34_35_36_37_38_39_40_41_42_43_44_45_46_47_48_49_50_51_52_53_54_55_56_57_58_59_60_61_62_63_64_65_66_67_68_69_70_71_72_73_74_75_76_77_78_79_80_81_82_83_84_85_86_87_88/1_2_3_4_5_6_7_8_9_10_11_12_13_14_15_16_17_18_19_20_21_22_23_24_25_26_27_28_29_30_31_32_33_34_35_36_37_38_39_40_41_42_43_44_45_46_47_48_49_50_51_52_53_54_55_56_57_58_59_60_61_62_63_64_65_66_67_68_69_70_71_72_73_74_75_76_77_78_79_80_81_82_83_84_85_86_87_88/ab does not support NFS export

Expected results:
export success, and no error msg: "does not support NFS export"

Additional info:
Comment 1 JianHong Yin 2015-07-15 04:56:31 UTC 
simple test script:

exportfs=${exportfs:-exportfs}

$exportfs -ua

dname=$(echo {1..88}|sed 's/ /_/g'); #254
fpath=/$dname/$dname/$dname/$dname;  #1020
mkdir -p $fpath/ab;                  #1023. # NFS_MAXPATHLEN == 1024
$exportfs -i 127.0.0.1:$fpath/ab;

$exportfs
Comment 4 Steve Dickson 2015-11-03 22:35:53 UTC 
(In reply to Yin.JianHong from comment #0)
> Created attachment 1052169 [details]
> fix patch
Would you mind sending this patch upstream at linux-nfs.org

tia!
Comment 6 Steve Dickson 2015-11-05 12:10:38 UTC 
commit 67a0768370a54100c77e58f611e1d1fceb93e2c0
Author: Jianhong Yin <jiyin>
Date:   Wed Nov 4 16:28:47 2015 -0500

    exportfs: Fix buf size in test_export() dump()
    
    From: Jianhong Yin <jiyin>
    
    The buf[] size in test_export() is not enough for NFS_MAXPATHLEN
    + prefix/suffix proto string. Fix it and same issue in dump().
    And just to be on the safe side, %s/sprintf/snprintf/
    
    Signed-off-by: Steve Dickson <steved>
Comment 10 Yongcheng Yang 2016-05-18 12:14:15 UTC 
Move to VERIFIED as comment 9. Will continue to run the automatic case in the future.
Comment 12 errata-xmlrpc 2016-11-04 05:00:04 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://rhn.redhat.com/errata/RHBA-2016-2383.html
Note You need to log in before you can comment on or make changes to this bug.