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Bug 1491585 - Allow /usr/sbin/abrt-harvest-vmcore capabilities for /var/crash
Summary: Allow /usr/sbin/abrt-harvest-vmcore capabilities for /var/crash
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.4
Hardware: All
OS: Linux
high
medium
Target Milestone: rc
: ---
Assignee: Lukas Vrabec
QA Contact: Milos Malik
URL:
Whiteboard:
: 1546167 (view as bug list)
Depends On:
Blocks: 1446410 1546167 1653106
TreeView+ depends on / blocked
 
Reported: 2017-09-14 08:32 UTC by Martin Kutlak
Modified: 2019-08-06 12:52 UTC (History)
7 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2019-08-06 12:51:45 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2019:2127 0 None None None 2019-08-06 12:52:06 UTC

Description Martin Kutlak 2017-09-14 08:32:29 UTC 
Description of problem:
abrt-addon-vmcore has an option to move (copy then delete) vmcores, by setting 'CopyVMcore' to 'no' under /etc/abrt/plugins/vmcore.conf.

But SELinux is preventing /usr/sbin/abrt-harvest-vmcore from deleting vmcores from /var/crash dir. 


Version-Release number of selected component (if applicable):
selinux-policy-3.13.1-166.el7.noarch

How reproducible:
Always

Steps to Reproduce:
1. Configure kdump and set default dump path to /var/crash

2. Install abrt along with its addon abrt-addon-vmcore

3. Set copyvmcore=no under /etc/abrt/plugins/vmcore.conf

4. Restart abrt-vmcore.service

5. Crash the system

Actual results:
abrt-harvest-vmcore: Unable to delete '/var/crash/127.0.0.1-2017-09-12-10:25:49'. Ignoring

SELinux is preventing /usr/bin/python2.7 from write access on the directory 127.0.0.1-2017-09-12-10:25:49.

Additional info:
type=AVC msg=audit(1505294459.205:166): avc:  denied  { write } for  pid=1715 comm="abrt-harvest-vm" name="127.0.0.1-2017-09-12-10:25:49" dev="dm-0" ino=44716 scontext=system_u:system_r:abrt_t:s0-s0:c0.c1023 tcontext=system_u:object_r:kdump_crash_t:s0 tclass=dir
Comment 2 Milos Malik 2017-10-17 11:32:32 UTC 
Could you re-run your scenario in permissive mode? I expect additional SELinux denials to be logged, for example: { add_name } and { create }.
Comment 3 Martin Kutlak 2017-10-17 12:47:26 UTC 
You were right. I've rerun the scenario with permissive mode and got these:

1)
Additional Information:
Source Context                system_u:system_r:abrt_t:s0-s0:c0.c1023
Target Context                system_u:object_r:kdump_crash_t:s0
Target Objects                127.0.0.1-2017-10-17-14:37:22 [ dir ]
Source                        abrt-harvest-vm
Source Path                   /usr/bin/python2.7
Port                          <Unknown>
Host                          localhost.localdomain
Source RPM Packages           python-2.7.5-58.el7.x86_64
Target RPM Packages           
Policy RPM                    selinux-policy-3.13.1-166.el7.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Permissive
Host Name                     localhost.localdomain
Platform                      Linux localhost.localdomain 3.10.0-693.el7.x86_64
                              #1 SMP Thu Jul 6 19:56:57 EDT 2017 x86_64 x86_64
Alert Count                   1
First Seen                    2017-10-17 14:37:37 CEST
Last Seen                     2017-10-17 14:37:37 CEST
Local ID                      b90f3b24-23f8-43b3-91a9-938cdedd8b66

Raw Audit Messages
type=AVC msg=audit(1508243857.827:114): avc:  denied  { write } for  pid=1491 comm="abrt-harvest-vm" name="127.0.0.1-2017-10-17-14:37:22" dev="dm-0" ino=44641 scontext=system_u:system_r:abrt_t:s0-s0:c0.c1023 tcontext=system_u:object_r:kdump_crash_t:s0 tclass=dir


type=AVC msg=audit(1508243857.827:114): avc:  denied  { remove_name } for  pid=1491 comm="abrt-harvest-vm" name="vmcore-dmesg.txt" dev="dm-0" ino=44650 scontext=system_u:system_r:abrt_t:s0-s0:c0.c1023 tcontext=system_u:object_r:kdump_crash_t:s0 tclass=dir


type=AVC msg=audit(1508243857.827:114): avc:  denied  { unlink } for  pid=1491 comm="abrt-harvest-vm" name="vmcore-dmesg.txt" dev="dm-0" ino=44650 scontext=system_u:system_r:abrt_t:s0-s0:c0.c1023 tcontext=system_u:object_r:kdump_crash_t:s0 tclass=file


type=SYSCALL msg=audit(1508243857.827:114): arch=x86_64 syscall=unlink success=yes exit=0 a0=f1c410 a1=0 a2=1 a3=fffffff0 items=0 ppid=1 pid=1491 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=abrt-harvest-vm exe=/usr/bin/python2.7 subj=system_u:system_r:abrt_t:s0-s0:c0.c1023 key=(null)


2)
Raw Audit Messages
type=AVC msg=audit(1508243857.830:115): avc:  denied  { rmdir } for  pid=1491 comm="abrt-harvest-vm" name="127.0.0.1-2017-10-17-14:37:22" dev="dm-0" ino=44641 scontext=system_u:system_r:abrt_t:s0-s0:c0.c1023 tcontext=system_u:object_r:kdump_crash_t:s0 tclass=dir


type=SYSCALL msg=audit(1508243857.830:115): arch=x86_64 syscall=rmdir success=yes exit=0 a0=f1c620 a1=0 a2=1 a3=fffffff0 items=0 ppid=1 pid=1491 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=abrt-harvest-vm exe=/usr/bin/python2.7 subj=system_u:system_r:abrt_t:s0-s0:c0.c1023 key=(null)
Comment 6 Milos Malik 2018-09-12 18:52:43 UTC 
Following rule (mentioned in comment#3) is missing:

allow abrt_t kdump_crash_t : dir { rmdir };

# rpm -qa selinux\*
selinux-policy-targeted-3.13.1-225.el7.noarch
selinux-policy-doc-3.13.1-225.el7.noarch
selinux-policy-minimum-3.13.1-225.el7.noarch
selinux-policy-mls-3.13.1-225.el7.noarch
selinux-policy-3.13.1-225.el7.noarch
selinux-policy-sandbox-3.13.1-225.el7.noarch
selinux-policy-devel-3.13.1-225.el7.noarch
#
Comment 9 Lukas Vrabec 2018-11-08 13:21:46 UTC 
*** Bug 1546167 has been marked as a duplicate of this bug. ***
Comment 10 Lukas Vrabec 2019-01-31 14:36:56 UTC 
commit d5ee2354148e66167aff265c0dfe6e4098b98455 (HEAD -> rhel7.7-contrib)
Author: Lukas Vrabec <lvrabec>
Date:   Thu Jan 31 15:35:45 2019 +0100

    Update kdump_manage_crash() interface to allow also manage dirs by caller domain
    Resolves: rhbz#1491585
Comment 17 errata-xmlrpc 2019-08-06 12:51:45 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/RHBA-2019:2127
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