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[Bug 396] BGPD on SPARC64 crashes all BGP sessions if the updates contain too many AS numbers
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http://bugzilla.quagga.net/show_bug.cgi?id=396





------- Additional Comments From chrisbinnie@gmail.com 2007-08-21 10:36 -------
Despite filtering the prefix with a hundred ASs in its path upstream this issue
arose again 24 hours later and crashed losing all BGP Sessions completely and
requiring a restart.



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[Bug 396] BGPD on SPARC64 crashes all BGP sessions if the updates contain too many AS numbers [ In reply to ]
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------- Additional Comments From paul@dishone.st 2007-08-21 16:49 -------
Can you get:

a) A backtrace or core dump (required: *unstripped* binaries, use the 'file'
command on relevant Quagga libraries and executables)

b) The exact AS_PATH causing the problem?

If possible, could you try:

a) Stock Quagga (presumably TCP-MD5 is a requirement for you)
b) Quagga 0.99 (0.99 bgp_aspath.c was half-rewritten, and the unit test contains
a test for a 250 ASN AS_SEQUENCE segment in an AS_PATH - i.e. this is handled
just fine in 0.99)




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[Bug 396] BGPD on SPARC64 crashes all BGP sessions if the updates contain too many AS numbers [ In reply to ]
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------- Additional Comments From chrisbinnie@gmail.com 2007-08-21 16:52 -------
Thanks, Paul. We will do so over the coming days.

We can confirm that i686 Quagga of the same version is not affected by this bug
and we have rolled out a new platform until this is resolved.



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[Bug 396] BGPD on SPARC64 crashes all BGP sessions if the updates contain too many AS numbers [ In reply to ]
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paul@dishone.st changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1




------- Additional Comments From paul@dishone.st 2007-08-21 18:07 -------
Ok, interesting.

I wonder is it alignment (but Linux on SPARC64 traps and fixes alignment faults
right? unlike Solaris and BSD on SPARC)



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------- Additional Comments From chrisbinnie@gmail.com 2007-08-21 20:06 -------
Please see some of the requested info below.

The AS path that caused the problem was: 3257 18747 27803 27803 27803 27803
27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803
27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803
27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803
27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803
27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803
27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803
27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803
27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803
27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803 27803
27803 27803 27803 27803 27803 27803 27803 I make this 130 AS numbers long.

This caused SIGBUS error (signal 10), probably due to the BGP path
attribute (AS path in this case) having the extended length bit set and using
bytes 3 & 4 of the attribute to hold the length information. Process dead after
this of course.

This is actually a legal path in BGP however, despite the length, though
obviously it has no legitimate real world use.

Quagga should have parsed this correctly without crashing (the SIGBUS
causing a complete crash is never a desirable outcome), and perhaps should have
a feature similar to the Cisco IOS command ‘bgp maxas-limit’ which discards
paths longer than a set value.

For an independent confirmation the Team Cymru Internet Monitor
(http://www.cymru.com/BGP/max_aspath_len.html) recorded this path overnight on
the 20th of August.





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------- Additional Comments From chrisbinnie@gmail.com 2007-08-21 20:24 -------
We didn’t take a core in the end. The problem was that the binary contained no
debugging symbols (i.e. was stripped) when it was ran inside gdb.

Is there any one that can please assist ?



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------- Additional Comments From paul@dishone.st 2007-08-22 12:46 -------
SIGBUS? So an alignment fault rather than a crash, it seems, and yes it's likely
due to the extended length (the 130 ASNs themselves aren't a problem, other than
they need extended length in the attribute header - the extra byte throws off
the alignment. I'm not sure where or how the old code does unaligned reads
though - my vague memory is that it did byte reads via a char * always..).

(Also weird that Linux didn't fixup - I thought Linux always did on all
platforms, where possible, unlike most other *NIXes. Linux did trap and fixup on
AXP anyway).

Can you test 0.99? Compile it and cd to to the 'tests' directory, run make there
and aspathtest. If it doesn't fault, and reports no errors, I would expect 0.99
bgpd should be immune to the bug below.


------- Additional Comments From chrisbinnie@gmail.com 2007-08-22 14:53 -------
Thanks, Paul.

We'll have to leave it for a few days because as you can imagine our customers
still aren't too happy about the downtime we had. Even out of hours testing will
need left for a few days.

If any one can simulate a 100 plus AS path length test in the meantime then
please do !

I can't believe we are the only ISP running Gentoo SPARC64 globally !



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------- Additional Comments From paul@dishone.st 2007-08-23 19:16 -------
Hmm, you can run 'aspathtest' without affecting existing services. It's a
standalone unit-test of the 0.99 bgp_aspath.c code.

That would at least confirm this issue does not affect 0.99.



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------- Additional Comments From chrisbinnie@gmail.com 2007-08-23 20:36 -------
Hi Paul,

The results from quagga-0.99.8 are looking good. I'll leave it to your expert
eye to confirm the output before marking the bug as resolved though.

Thanks for your help,

Chris





Server1 tests # ./aspathtest

seq1: seq(8466,3,52737,4096)
aspath: 8466 3 52737 4096
validating...:
OK

empty prepend seq1: seq(8466,3,52737,4096)
aspath: 8466 3 52737 4096
OK

seq2: seq(8722) seq(4)
aspath: 8722 4
validating...:
OK

empty prepend seq2: seq(8722) seq(4)
aspath: 8722 4
OK

seq3: seq(8466,3,52737,4096,8722,4)
aspath: 8466 3 52737 4096 8722 4
validating...:
OK

empty prepend seq3: seq(8466,3,52737,4096,8722,4)
aspath: 8466 3 52737 4096 8722 4
OK

seqset: seq(8482,51457) set(5204)
aspath: 8482 51457 {5204}
validating...:
OK

empty prepend seqset: seq(8482,51457) set(5204)
aspath: 8482 51457 {5204}
OK

seqset2: seq(8467, 59649) set(4196,48658) set(17322,30745)
aspath: 8467 59649 {4196,48658} {17322,30745}
validating...:
OK

empty prepend seqset2: seq(8467, 59649) set(4196,48658) set(17322,30745)
aspath: 8467 59649 {4196,48658} {17322,30745}
OK

multi: seq(6435,59408,21665) set(2457,61697,4369), seq(1842,41590,51793)
aspath: 6435 59408 21665 {2457,4369,61697} 1842 41590 51793
validating...:
OK

empty prepend multi: seq(6435,59408,21665) set(2457,61697,4369),
seq(1842,41590,51793)
aspath: 6435 59408 21665 {2457,4369,61697} 1842 41590 51793
OK

confed: confseq(123,456,789)
aspath: (123 456 789)
validating...:
OK

empty prepend confed: confseq(123,456,789)
aspath: (123 456 789)
OK

confed2: confseq(123,456,789) confseq(111,222)
aspath: (123 456 789) (111 222)
validating...:
OK

empty prepend confed2: confseq(123,456,789) confseq(111,222)
aspath: (123 456 789) (111 222)
OK

confset: confset(456,123,789)
aspath: [123,456,789]
validating...:
OK

empty prepend confset: confset(456,123,789)
aspath: [123,456,789]
OK

confmulti: confseq(123,456,789) confset(222,111) seq(8722) set(4196,48658)
aspath: (123 456 789) [111,222] 8722 {4196,48658}
validating...:
OK

empty prepend confmulti: confseq(123,456,789) confset(222,111) seq(8722)
set(4196,48658)
aspath: (123 456 789) [111,222] 8722 {4196,48658}
OK

seq4: seq(8466,2,52737,4096,8722,4)
aspath: 8466 2 52737 4096 8722 4
validating...:
OK

empty prepend seq4: seq(8466,2,52737,4096,8722,4)
aspath: 8466 2 52737 4096 8722 4
OK

tripleseq1: seq(8466,2,52737) seq(4096,8722,4) seq(8722)
aspath: 8466 2 52737 4096 8722 4 8722
validating...:
OK

empty prepend tripleseq1: seq(8466,2,52737) seq(4096,8722,4) seq(8722)
aspath: 8466 2 52737 4096 8722 4 8722
OK

someprivate: seq(8466,64512,52737,65535)
aspath: 8466 64512 52737 65535
validating...:
OK

empty prepend someprivate: seq(8466,64512,52737,65535)
aspath: 8466 64512 52737 65535
OK

allprivate: seq(65534,64512,64513,65535)
aspath: 65534 64512 64513 65535
validating...:
OK

empty prepend allprivate: seq(65534,64512,64513,65535)
aspath: 65534 64512 64513 65535
OK

long: seq(8466,3,52737,4096,34285,<repeated 49 more times>)
aspath: 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285
8466 3 52737 4096 34
285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3
52737 4096 34285 8466 3 52737 4096 34285
8466 3 52737 4096 34285 8466 3 52737 4096
34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466
3 52737 4096 34285 8466
3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 5
2737
4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096
34285 8466 3 52737
4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466
3 52737 4096 34285 8466 3 52737 409
6 34285 8466 3 52737 4096 34285 8466 3 52737
4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34
285 8466 3 52737 4096 34285
8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285
8466 3
52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737
4096 34285 8466
3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285
8466 3 52737 4096 34285 8466 3 5
2737 4096 34285 8466 3 52737 4096 34285 8466 3
52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737
4096 34285 8466 3 52737 4096
34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 409
6 34285
validating...:
OK

empty prepend long: seq(8466,3,52737,4096,34285,<repeated 49 more times>)
aspath: 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285
8466 3 52737 4096 34
285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3
52737 4096 34285 8466 3 52737 4096 34285
8466 3 52737 4096 34285 8466 3 52737 4096
34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466
3 52737 4096 34285 8466
3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 5
2737
4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096
34285 8466 3 52737
4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466
3 52737 4096 34285 8466 3 52737 409
6 34285 8466 3 52737 4096 34285 8466 3 52737
4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34
285 8466 3 52737 4096 34285
8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285
8466 3
52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737
4096 34285 8466
3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285
8466 3 52737 4096 34285 8466 3 5
2737 4096 34285 8466 3 52737 4096 34285 8466 3
52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737
4096 34285 8466 3 52737 4096
34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 409
6 34285
OK

seq1extra: seq(8466,3,52737,4096,3456)
aspath: 8466 3 52737 4096 3456
validating...:
OK

empty prepend seq1extra: seq(8466,3,52737,4096,3456)
aspath: 8466 3 52737 4096 3456
OK

empty: <empty>
aspath:
validating...:
OK

empty prepend empty: <empty>
aspath:
OK

redundantset: seq(8466,3,52737,4096,3456) set(7099,8153,8153,8153)
aspath: 8466 3 52737 4096 3456 {7099,8153,8153,8153}
validating...:
OK

empty prepend redundantset: seq(8466,3,52737,4096,3456) set(7099,8153,8153,8153)
aspath: 8466 3 52737 4096 3456 {7099,8153,8153,8153}
OK

prepend seq1: seq(8466,3,52737,4096)
to seq2: seq(8722) seq(4)
aspath: 8466 3 52737 4096 8722 4
OK

prepend seq2: seq(8722) seq(4)
to seqset: seq(8482,51457) set(5204)
aspath: 8722 4 8482 51457 {5204}
OK

prepend seqset: seq(8482,51457) set(5204)
to seqset2: seq(8467, 59649) set(4196,48658) set(17322,30745)
aspath: 8482 51457 {5204} 8467 59649 {4196,48658} {17322,30745}
OK

prepend seqset2: seq(8467, 59649) set(4196,48658) set(17322,30745)
to multi: seq(6435,59408,21665) set(2457,61697,4369), seq(1842,41590,51793)
aspath: 8467 59649 {4196,48658} {17322,30745} 6435 59408 21665 {2457,4369,61697}
1842 41590 51793
OK

prepend multi: seq(6435,59408,21665) set(2457,61697,4369), seq(1842,41590,51793)
to confed: confseq(123,456,789)
aspath: 6435 59408 21665 {2457,4369,61697} 1842 41590 51793 (123 456 789)
OK

prepend confed: confseq(123,456,789)
to confed2: confseq(123,456,789) confseq(111,222)
aspath: (123 456 789) (123 456 789) (111 222)
OK

prepend confed2: confseq(123,456,789) confseq(111,222)
to confset: confset(456,123,789)
aspath: (123 456 789) (111 222) [123,456,789]
OK

prepend confset: confset(456,123,789)
to confmulti: confseq(123,456,789) confset(222,111) seq(8722) set(4196,48658)
aspath: [123,456,789] (123 456 789) [111,222] 8722 {4196,48658}
OK

prepend confmulti: confseq(123,456,789) confset(222,111) seq(8722) set(4196,48658)
to confset: confset(456,123,789)
aspath: (123 456 789) [111,222] 8722 {4196,48658} [123,456,789]
OK

prepend long: seq(8466,3,52737,4096,34285,<repeated 49 more times>)
to tripleseq1: seq(8466,2,52737) seq(4096,8722,4) seq(8722)
aspath: 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285
8466 3 52737 4096 34
285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3
52737 4096 34285 8466 3 52737 4096 34285
8466 3 52737 4096 34285 8466 3 52737 4096
34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466
3 52737 4096 34285 8466
3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 5
2737
4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096
34285 8466 3 52737
4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466
3 52737 4096 34285 8466 3 52737 409
6 34285 8466 3 52737 4096 34285 8466 3 52737
4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34
285 8466 3 52737 4096 34285
8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285
8466 3
52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737
4096 34285 8466
3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285
8466 3 52737 4096 34285 8466 3 5
2737 4096 34285 8466 3 52737 4096 34285 8466 3
52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737
4096 34285 8466 3 52737 4096
34285 8466 3 52737 4096 34285 8466 3 52737 4096 34285 8466 3 52737 409
6 34285 8466
2 52737 4096 8722 4 8722
OK

aggregate seq1: seq(8466,3,52737,4096)
with seq2: seq(8722) seq(4)
aspath: {3,4,4096,8466,8722,52737}
OK

aggregate seq1: seq(8466,3,52737,4096)
with seq3: seq(8466,3,52737,4096,8722,4)
aspath: 8466 3 52737 4096 {4,8722}
OK

aggregate seq3: seq(8466,3,52737,4096,8722,4)
with seq1: seq(8466,3,52737,4096)
aspath: 8466 3 52737 4096 {4,8722}
OK

aggregate seq3: seq(8466,3,52737,4096,8722,4)
with seq4: seq(8466,2,52737,4096,8722,4)
aspath: 8466 {2,3,4,4096,8722,52737}
OK

aggregate seq4: seq(8466,2,52737,4096,8722,4)
with seq3: seq(8466,3,52737,4096,8722,4)
aspath: 8466 {2,3,4,4096,8722,52737}
OK

left cmp seq1: seq(8466,3,52737,4096)
and seq2: seq(8722) seq(4)
OK

left cmp seq1: seq(8466,3,52737,4096)
and seq3: seq(8466,3,52737,4096,8722,4)
OK

left cmp seq1: seq(8466,3,52737,4096)
and tripleseq1: seq(8466,2,52737) seq(4096,8722,4) seq(8722)
OK

left cmp seq1: seq(8466,3,52737,4096)
and seq1extra: seq(8466,3,52737,4096,3456)
OK

left cmp seq1: seq(8466,3,52737,4096)
and empty: <empty>
OK

left cmp seq2: seq(8722) seq(4)
and tripleseq1: seq(8466,2,52737) seq(4096,8722,4) seq(8722)
OK

left cmp confed: confseq(123,456,789)
and confed2: confseq(123,456,789) confseq(111,222)
OK

left cmp confed: confseq(123,456,789)
and confset: confset(456,123,789)
OK

left cmp confed2: confseq(123,456,789) confseq(111,222)
and confset: confset(456,123,789)
OK

left cmp seq2: seq(8722) seq(4)
and confmulti: confseq(123,456,789) confset(222,111) seq(8722) set(4196,48658)
OK

left cmp seq1: seq(8466,3,52737,4096)
and confmulti: confseq(123,456,789) confset(222,111) seq(8722) set(4196,48658)
OK

left cmp seqset: seq(8482,51457) set(5204)
and confmulti: confseq(123,456,789) confset(222,111) seq(8722) set(4196,48658)
OK

left cmp seq1: seq(8466,3,52737,4096)
and confed: confseq(123,456,789)
OK

left cmp seq2: seq(8722) seq(4)
and confed: confseq(123,456,789)
OK

left cmp seq1: seq(8466,3,52737,4096)
and confset: confset(456,123,789)
OK

left cmp seq2: seq(8722) seq(4)
and confset: confset(456,123,789)
OK

left cmp tripleseq1: seq(8466,2,52737) seq(4096,8722,4) seq(8722)
and confed: confseq(123,456,789)
OK

left cmp tripleseq1: seq(8466,2,52737) seq(4096,8722,4) seq(8722)
and confed2: confseq(123,456,789) confseq(111,222)
OK

left cmp tripleseq1: seq(8466,2,52737) seq(4096,8722,4) seq(8722)
and confset: confset(456,123,789)
OK

left cmp confmulti: confseq(123,456,789) confset(222,111) seq(8722) set(4196,48658)
and confed: confseq(123,456,789)
OK

left cmp confmulti: confseq(123,456,789) confset(222,111) seq(8722) set(4196,48658)
and confed2: confseq(123,456,789) confseq(111,222)
OK

left cmp confmulti: confseq(123,456,789) confset(222,111) seq(8722) set(4196,48658)
and confset: confset(456,123,789)
OK

empty_get_test, as:
OK

failures: 0
aspath count: 0



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[Bug 396] BGPD on SPARC64 crashes all BGP sessions if the updates contain too many AS numbers [ In reply to ]
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http://bugzilla.quagga.net/show_bug.cgi?id=396





------- Additional Comments From paul@dishone.st 2007-08-27 13:09 -------
That strongly suggests 0.99 ought to be immune.




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[Bug 396] BGPD on SPARC64 crashes all BGP sessions if the updates contain too many AS numbers [ In reply to ]
Please do not reply directly to this email. All additional
comments should be made in the comments box of this bug
report.

http://bugzilla.quagga.net/show_bug.cgi?id=396


chrisbinnie@gmail.com changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |CLOSED
Resolution| |FIXED




------- Additional Comments From chrisbinnie@gmail.com 2007-08-27 15:16 -------
It looks like 0.99 will resolve this bug.



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