mirrors/tcpdump
0
0
Fork 0
mirror of https://github.com/the-tcpdump-group/tcpdump.git synced 2024-11-23 01:53:55 +08:00
Code Issues Packages Projects Releases Wiki Activity

erspan: add checks for data we don't print.

Browse Source 
Make sure we don't run past the end of the captured data for fields we
skip in ERSPAN type III packets.

Add a test file.
This commit is contained in:
Guy Harris 2024-10-28 08:22:22 -07:00
parent fb3da61120
commit c2c2549677
4 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
print-erspan.c
View File

@ -244,11 +244,13 @@ erspan_iii_print(netdissect_options *ndo, const u_char *bp, u_int len)
/* Skip timestamp */
ND_ICHECK_U(len, <, 4);
ND_TCHECK_LEN(bp, 4);
bp += 4;
len -= 4;
/* Skip SGT */
ND_ICHECK_U(len, <, 2);
ND_TCHECK_LEN(bp, 2);
bp += 2;
len -= 2;
@ -267,6 +269,7 @@ erspan_iii_print(netdissect_options *ndo, const u_char *bp, u_int len)
if (hdr2 & ERSPAN3_O_MASK) {
/* Yes. Skip it. */
ND_ICHECK_U(len, <, 8);
ND_TCHECK_LEN(bp, 8);
bp += 8;
len -= 8;
}

1
tests/TESTLIST
View File

@ -593,6 +593,7 @@ erspan-type-ii-2 erspan-type-ii-2.pcap erspan-type-ii-2.out -v
erspan-type-ii-3 erspan-type-ii-3.pcap erspan-type-ii-3.out -v
erspan-type-iii-ft-0 erspan-type-iii-ft-0.pcap erspan-type-iii-ft-0.out -v
erspan-type-iii-ft-7 erspan-type-iii-ft-7.pcap erspan-type-iii-ft-7.out -v
erspan-type-iii-pb-1 erspan-type-iii-pb-1.pcap erspan-type-iii-pb-1.out -v
# bad packets from Hanno Böck
# heap-overflow-1 is in non-bsd.tests

2
tests/erspan-type-iii-pb-1.out Normal file
View File

@ -0,0 +1,2 @@
1 1972-02-16 17:25:18.554240 IP6 (class 0x30, flowlabel 0x00001, hlim 1, next-header unknown (60), payload length 288) 4120:7467:1700:4200:143:100:7f01:400e > 4591:bfd7:cd87:d7:68:38:101:e800: DSTOPT (padn)(pad1)(padn)(opt_type 0x40: len=1)(pad1)(opt_type 0x7f: len=0)(pad1)(pad1) GREv0, Flags [sequence# present, source routing present], seq 4280811777, length 272
erspan type3 session 0 bso Short cos 0 ft Ethernet [|erspan]

BIN
tests/erspan-type-iii-pb-1.pcap Normal file
View File

Binary file not shown.