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Bug 1829820

Summary: nfnl_osf fails to load signatures
Product: Red Hat Enterprise Linux 7 Reporter: Lev Veyde <lveyde>
Component: iptablesAssignee: Phil Sutter <psutter>
Status: CLOSED ERRATA QA Contact: Tomas Dolezal <todoleza>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 7.8CC: iptables-maint-list, sbonazzo, todoleza
Target Milestone: rcKeywords: Regression
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: iptables-1.4.21-35.el7 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of:
: 1837367 (view as bug list) Environment:
Last Closed: 2020-09-29 20:39:23 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:
Embargoed:
Bug Depends On:    
Bug Blocks: 1837367    

Description Lev Veyde 2020-04-30 12:33:09 UTC 
Description of problem:
nfnl_osf seems to halt right at the first signature, and thus fails to load them into the kernel.


Version-Release number of selected component (if applicable):
iptables-utils-1.4.21-34.el7.x86_64

How reproducible:


Steps to Reproduce:
1. install iptables-utils in order to get the nfnl_osf tool
# yum install iptables-utils

2. run the nfnl_osf to load the signatures
# nfnl_osf -f /usr/share/xtables/pf.os

3. the tool seems to show the first signature and stuck there

Actual results:
tool get stuck at the first signature rule loading

Expected results:
all rules from the signature file should be loaded successfully

Additional info:

After the failed load attempt, the first attempt of signature rule removal w/:
nfnl_osf -f /usr/share/xtables/pf.os -d

will also get stuck. Then on additional attempts it seems not to hang, but returns w/ returncode of 255.


strace says it's get stuck on loads w/:

sendto(3, {{len=616, type=NFNL_SUBSYS_OSF<<8|OSF_MSG_ADD, flags=NLM_F_REQUEST|0x400, seq=1588249244, pid=0}, {nfgen_family=AF_UNSPEC, version=NFNETLINK_V0, res_id=htons(0), {{nla_len=596, nla_type=NFNETLINK_V1}, "\x00\x00\x00\x00\x00\x40\x00\x00\x40\x00\x3c\x00\x00\x00\x06\x00\x41\x49\x58\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"...}}, 616, 0, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, 12) = 616

recvfrom(3, 0x7ffc95bd5790, 8192, 0, 0x7ffc95bd5760, [12]) = ? ERESTARTSYS (To be restarted if SA_RESTART is set)


first remove attempt:
sendto(3, {{len=616, type=NFNL_SUBSYS_OSF<<8|OSF_MSG_REMOVE, flags=NLM_F_REQUEST, seq=1588249531, pid=0}, {nfgen_family=AF_UNSPEC, version=NFNETLINK_V0, res_id=htons(0), {{nla_len=596, nla_type=NFNETLINK_V1}, "\x00\x00\x00\x00\x00\x40\x00\x00\x40\x00\x3c\x00\x00\x00\x06\x00\x41\x49\x58\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"...}}, 616, 0, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, 12) = 616

recvfrom(3, 0x7ffc5a7e9d80, 8192, 0, 0x7ffc5a7e9d50, [12]) = ? ERESTARTSYS (To be restarted if SA_RESTART is set)

second remove attempt:
sendto(3, {{len=616, type=NFNL_SUBSYS_OSF<<8|OSF_MSG_REMOVE, flags=NLM_F_REQUEST, seq=1588249615, pid=0}, {nfgen_family=AF_UNSPEC, version=NFNETLINK_V0, res_id=htons(0), {{nla_len=596, nla_type=NFNETLINK_V1}, "\x00\x00\x00\x00\x00\x40\x00\x00\x40\x00\x3c\x00\x00\x00\x06\x00\x41\x49\x58\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"...}}, 616, 0, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, 12) = 616

recvfrom(3, {{len=636, type=NLMSG_ERROR, flags=0, seq=1588249615, pid=17599}, {error=-ENOENT, msg={{len=616, type=NFNL_SUBSYS_OSF<<8|OSF_MSG_REMOVE, flags=NLM_F_REQUEST, seq=1588249615, pid=0}, {nfgen_family=AF_UNSPEC, version=NFNETLINK_V0, res_id=htons(0), {{nla_len=596, nla_type=NFNETLINK_V1}, "\x00\x00\x00\x00\x00\x40\x00\x00\x40\x00\x3c\x00\x00\x00\x06\x00\x41\x49\x58\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"...}}}}, 8192, 0, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, [12]) = 636

close(4)                                = 0

munmap(0x7f335b112000, 4096)            = 0

close(3)                                = 0

exit_group(-1)                          = ?
+++ exited with 255 +++
Comment 2 Phil Sutter 2020-05-09 11:55:35 UTC 
Hi!

Yes, I broke it. :(

Fix sent upstream: https://lore.kernel.org/netfilter-devel/20200509115200.19480-2-phil@nwl.cc/
Found another problem in delete functionality while debugging the above, fixed as well: https://lore.kernel.org/netfilter-devel/20200509115200.19480-3-phil@nwl.cc/
Comment 9 errata-xmlrpc 2020-09-29 20:39:23 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 (iptables bug fix and enhancement update), 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-2020:4023