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Resolves: RHEL-44357 - fix unexpected header length in /proc/net/snmp 

Signed-off-by: Josef Řídký <jridky@redhat.com>
This commit is contained in:
Josef Řídký 2024-06-21 15:13:09 +02:00
parent d585f82165
commit d9b0434c3d
2 changed files with 126 additions and 1 deletions
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120
net-snmp-5.9.4-kernel-6.7.patch Normal file
View File

@ -0,0 +1,120 @@
From f5ae6baf0018abda9dedc368fe6d52c0d7a8ab8f Mon Sep 17 00:00:00 2001
From: Philippe Troin <phil+github-commits@fifi.org>
Date: Sat, 3 Feb 2024 10:30:30 -0800
Subject: [PATCH] Add Linux 6.7 compatibility parsing /proc/net/snmp
Linux 6.7 adds a new OutTransmits field to Ip in /proc/net/snmp.
This breaks the hard-coded assumptions about the Ip line length.
Add compatibility to parse Linux 6.7 Ip header while keep support
for previous versions.
---
.../ip-mib/data_access/systemstats_linux.c | 46 +++++++++++++++----
1 file changed, 37 insertions(+), 9 deletions(-)
diff --git a/agent/mibgroup/ip-mib/data_access/systemstats_linux.c b/agent/mibgroup/ip-mib/data_access/systemstats_linux.c
index 49e0a34d5c..f04e828a94 100644
--- a/agent/mibgroup/ip-mib/data_access/systemstats_linux.c
+++ b/agent/mibgroup/ip-mib/data_access/systemstats_linux.c
@@ -36,7 +36,7 @@ netsnmp_access_systemstats_arch_init(void)
}
/*
- /proc/net/snmp
+ /proc/net/snmp - Linux 6.6 and lower
Ip: Forwarding DefaultTTL InReceives InHdrErrors InAddrErrors ForwDatagrams InUnknownProtos InDiscards InDelivers OutRequests OutDiscards OutNoRoutes ReasmTimeout ReasmReqds ReasmOKs ReasmFails FragOKs FragFails FragCreates
Ip: 2 64 7083534 0 0 0 0 0 6860233 6548963 0 0 1 286623 63322 1 259920 0 0
@@ -49,6 +49,26 @@ netsnmp_access_systemstats_arch_init(void)
Udp: InDatagrams NoPorts InErrors OutDatagrams
Udp: 1491094 122 0 1466178
+*
+ /proc/net/snmp - Linux 6.7 and higher
+
+ Ip: Forwarding DefaultTTL InReceives InHdrErrors InAddrErrors ForwDatagrams InUnknownProtos InDiscards InDelivers OutRequests OutDiscards OutNoRoutes ReasmTimeout ReasmReqds ReasmOKs ReasmFails FragOKs FragFails FragCreates OutTransmits
+ Ip: 1 64 50859058 496 0 37470604 0 0 20472980 7515791 1756 0 0 7264 3632 0 3548 0 7096 44961424
+
+ Icmp: InMsgs InErrors InCsumErrors InDestUnreachs InTimeExcds InParmProbs InSrcQuenchs InRedirects InEchos InEchoReps InTimestamps InTimestampReps InAddrMasks InAddrMaskReps OutMsgs OutErrors OutRateLimitGlobal OutRateLimitHost OutDestUnreachs OutTimeExcds OutParmProbs OutSrcQuenchs OutRedirects OutEchos OutEchoReps OutTimestamps OutTimestampReps OutAddrMasks OutAddrMaskReps
+ Icmp: 114447 2655 0 17589 0 0 0 0 66905 29953 0 0 0 0 143956 0 0 572 16610 484 0 0 0 59957 66905 0 0 0 0
+
+ IcmpMsg: InType0 InType3 InType8 OutType0 OutType3 OutType8 OutType11
+ IcmpMsg: 29953 17589 66905 66905 16610 59957 484
+
+ Tcp: RtoAlgorithm RtoMin RtoMax MaxConn ActiveOpens PassiveOpens AttemptFails EstabResets CurrEstab InSegs OutSegs RetransSegs InErrs OutRsts InCsumErrors
+ Tcp: 1 200 120000 -1 17744 13525 307 3783 6 18093137 9277788 3499 8 7442 0
+
+ Udp: InDatagrams NoPorts InErrors OutDatagrams RcvbufErrors SndbufErrors InCsumErrors IgnoredMulti MemErrors
+ Udp: 2257832 1422 0 2252835 0 0 0 84 0
+
+ UdpLite: InDatagrams NoPorts InErrors OutDatagrams RcvbufErrors SndbufErrors InCsumErrors IgnoredMulti MemErrors
+ UdpLite: 0 0 0 0 0 0 0 0 0
*/
@@ -101,10 +121,10 @@ _systemstats_v4(netsnmp_container* container, u_int load_flags)
FILE *devin;
char line[1024];
netsnmp_systemstats_entry *entry = NULL;
- int scan_count;
+ int scan_count, expected_scan_count;
char *stats, *start = line;
int len;
- unsigned long long scan_vals[19];
+ unsigned long long scan_vals[20];
DEBUGMSGTL(("access:systemstats:container:arch", "load v4 (flags %x)\n",
load_flags));
@@ -126,10 +146,17 @@ _systemstats_v4(netsnmp_container* container, u_int load_flags)
*/
NETSNMP_IGNORE_RESULT(fgets(line, sizeof(line), devin));
len = strlen(line);
- if (224 != len) {
+ switch (len) {
+ case 224:
+ expected_scan_count = 19;
+ break;
+ case 237:
+ expected_scan_count = 20;
+ break;
+ default:
fclose(devin);
snmp_log(LOG_ERR, "systemstats_linux: unexpected header length in /proc/net/snmp."
- " %d != 224\n", len);
+ " %d not in { 224, 237 } \n", len);
return -4;
}
@@ -178,20 +205,20 @@ _systemstats_v4(netsnmp_container* container, u_int load_flags)
memset(scan_vals, 0x0, sizeof(scan_vals));
scan_count = sscanf(stats,
"%llu %llu %llu %llu %llu %llu %llu %llu %llu %llu"
- "%llu %llu %llu %llu %llu %llu %llu %llu %llu",
+ "%llu %llu %llu %llu %llu %llu %llu %llu %llu %llu",
&scan_vals[0],&scan_vals[1],&scan_vals[2],
&scan_vals[3],&scan_vals[4],&scan_vals[5],
&scan_vals[6],&scan_vals[7],&scan_vals[8],
&scan_vals[9],&scan_vals[10],&scan_vals[11],
&scan_vals[12],&scan_vals[13],&scan_vals[14],
&scan_vals[15],&scan_vals[16],&scan_vals[17],
- &scan_vals[18]);
+ &scan_vals[18],&scan_vals[19]);
DEBUGMSGTL(("access:systemstats", " read %d values\n", scan_count));
- if(scan_count != 19) {
+ if(scan_count != expected_scan_count) {
snmp_log(LOG_ERR,
"error scanning systemstats data (expected %d, got %d)\n",
- 19, scan_count);
+ expected_scan_count, scan_count);
netsnmp_access_systemstats_entry_free(entry);
return -4;
}
@@ -223,6 +250,7 @@ _systemstats_v4(netsnmp_container* container, u_int load_flags)
entry->stats.HCOutFragFails.high = scan_vals[17] >> 32;
entry->stats.HCOutFragCreates.low = scan_vals[18] & 0xffffffff;
entry->stats.HCOutFragCreates.high = scan_vals[18] >> 32;
+ /* entry->stats. = scan_vals[19]; / * OutTransmits */
entry->stats.columnAvail[IPSYSTEMSTATSTABLE_HCINRECEIVES] = 1;
entry->stats.columnAvail[IPSYSTEMSTATSTABLE_INHDRERRORS] = 1;

7
net-snmp.spec
View File

@ -10,7 +10,7 @@
Summary: A collection of SNMP protocol tools and libraries
Name: net-snmp
Version: 5.9.1
Release: 15%{?dist}
Release: 16%{?dist}
Epoch: 1
License: BSD
@ -58,6 +58,7 @@ Patch28: net-snmp-5.9-sendmsg-error-code.patch
Patch29: net-snmp-5.9-message-severity.patch
Patch30: net-snmp-5.9-rpmdb.patch
Patch31: net-snmp-5.9-CVE-2022-24805-24810.patch
Patch32: net-snmp-5.9.4-kernel-6.7.patch
# Modern RPM API means at least EL6
Patch101: net-snmp-5.8-modern-rpm-api.patch
@ -241,6 +242,7 @@ cp %{SOURCE10} .
%patch29 -p1 -b .message-severity
%patch30 -p1 -b .rpmdb
%patch31 -p1 -b .CVE-2022-24805-24810
%patch32 -p1 -b .kernel-6.7-fix
%patch101 -p1 -b .modern-rpm-api
%patch102 -p1
@ -510,6 +512,9 @@ LD_LIBRARY_PATH=%{buildroot}/%{_libdir} make test
%{_libdir}/libnetsnmptrapd*.so.%{soname}*
%changelog
* Fri Jun 21 2024 Josef Ridky <jridky@redhat.com> - 1:5.9.1-16
- fix unexpected header length in /proc/net/snmp (RHEL-44357)
* Tue Apr 09 2024 Josef Ridky <jridky@redhat.com> - 1:5.9.1-15
- fix changelog issue