49 lines
2.7 KiB
Diff
49 lines
2.7 KiB
Diff
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From 0998b38e4d61179441f90dd7e7fd6a3a8b7bd8c5 Mon Sep 17 00:00:00 2001
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From: Donatas Abraitis <donatas@opensourcerouting.org>
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Date: Wed, 31 Jul 2024 08:35:14 +0300
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Subject: [PATCH] bgpd: Check the actual remaining stream length before taking
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TLV value
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```
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0 0xb50b9f898028 in __sanitizer_print_stack_trace (/home/ubuntu/frr-public/frr_public_private-libfuzzer/bgpd/.libs/bgpd+0x368028) (BuildId: 3292703ed7958b20076550c967f879db8dc27ca7)
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1 0xb50b9f7ed8e4 in fuzzer::PrintStackTrace() (/home/ubuntu/frr-public/frr_public_private-libfuzzer/bgpd/.libs/bgpd+0x2bd8e4) (BuildId: 3292703ed7958b20076550c967f879db8dc27ca7)
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2 0xb50b9f7d4d9c in fuzzer::Fuzzer::CrashCallback() (/home/ubuntu/frr-public/frr_public_private-libfuzzer/bgpd/.libs/bgpd+0x2a4d9c) (BuildId: 3292703ed7958b20076550c967f879db8dc27ca7)
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3 0xe0d12d7469cc (linux-vdso.so.1+0x9cc) (BuildId: 1a77697e9d723fe22246cfd7641b140c427b7e11)
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4 0xe0d12c88f1fc in __pthread_kill_implementation nptl/pthread_kill.c:43:17
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5 0xe0d12c84a678 in gsignal signal/../sysdeps/posix/raise.c:26:13
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6 0xe0d12c83712c in abort stdlib/abort.c:79:7
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7 0xe0d12d214724 in _zlog_assert_failed /home/ubuntu/frr-public/frr_public_private-libfuzzer/lib/zlog.c:789:2
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8 0xe0d12d1285e4 in stream_get /home/ubuntu/frr-public/frr_public_private-libfuzzer/lib/stream.c:324:3
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9 0xb50b9f8e47c4 in bgp_attr_encap /home/ubuntu/frr-public/frr_public_private-libfuzzer/bgpd/bgp_attr.c:2758:3
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10 0xb50b9f8dcd38 in bgp_attr_parse /home/ubuntu/frr-public/frr_public_private-libfuzzer/bgpd/bgp_attr.c:3783:10
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11 0xb50b9faf74b4 in bgp_update_receive /home/ubuntu/frr-public/frr_public_private-libfuzzer/bgpd/bgp_packet.c:2383:20
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12 0xb50b9faf1dcc in bgp_process_packet /home/ubuntu/frr-public/frr_public_private-libfuzzer/bgpd/bgp_packet.c:4075:11
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13 0xb50b9f8c90d0 in LLVMFuzzerTestOneInput /home/ubuntu/frr-public/frr_public_private-libfuzzer/bgpd/bgp_main.c:582:3
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```
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Reported-by: Iggy Frankovic <iggyfran@amazon.com>
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Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>
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---
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bgpd/bgp_attr.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/bgpd/bgp_attr.c b/bgpd/bgp_attr.c
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index 2ed49935e52b..ac5d08b6fe6e 100644
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--- a/bgpd/bgp_attr.c
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+++ b/bgpd/bgp_attr.c
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@@ -2749,6 +2749,14 @@ static int bgp_attr_encap(struct bgp_attr_parser_args *args)
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args->total);
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}
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+ if (STREAM_READABLE(BGP_INPUT(peer)) < sublength) {
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+ zlog_err("Tunnel Encap attribute sub-tlv length %d exceeds remaining stream length %zu",
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+ sublength, STREAM_READABLE(BGP_INPUT(peer)));
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+ return bgp_attr_malformed(args,
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+ BGP_NOTIFY_UPDATE_OPT_ATTR_ERR,
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+ args->total);
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+ }
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+
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/* alloc and copy sub-tlv */
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/* TBD make sure these are freed when attributes are released */
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tlv = XCALLOC(MTYPE_ENCAP_TLV,
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