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[83.57.175.68]) by smtp.gmail.com with ESMTPSA id i11sm8404377ejf.76.2021.03.09.10.27.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Mar 2021 10:27:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1615314462; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=TtxWL3Du/wlfW39OySA2Yubdhxe8Lb4gYnlamtSDn8U=; b=H+w3E19lnQ8krn7Dg1spQeOeAGibrMWNC5rDgwLqoG09sJVXfwV/9OPI6MfXww9uXHOusO iAhWe4MWsZCrBDO1vRK0YSwZDyRAgp2hE4Gimw1EWDAUMBE6csKZMUiynye0U4VMPwjdPq T05LJIo8W9+nVhLAI6iX+ad8+RlWKQo= X-MC-Unique: FJCfA-vwNsqgIvavdU9zYQ-1 X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=TtxWL3Du/wlfW39OySA2Yubdhxe8Lb4gYnlamtSDn8U=; b=aQV/3bZJlSPrr8EKdGgflW26Zz7X6KTxV6I90N6KCjl5BbqhYFBAwLLTF+LAJ5E8z0 dEB+zP01NouzKQ1kXZ5ayjy0BN6WycBIkAC4Z9hVLgEbdQJaHPVL9tuAzC51WJUrbEUd TN4VKdNbViI2qowRlNBnhEns29xEFnqVff0w2NX9uFfZ3J8HTkwT0nEIDhvtJL1ygDqS 8ngnDQ8VN5OSWnfuG5c6X+oin+5hTzBG9UoilfyfweAjjZKSodtLdz6/QavTxG3MtxbG KzlyOe+9uaBvQeERTeKXFdf0Vh+VK3kkZkhYfRN7S5QHlNfed2qA7KbMTWYz5PoXdVYV LYiA== X-Gm-Message-State: AOAM531GgzUVPPv6FF7FIVKFrEgVP/8WLZchLqol85g/EvJmQYW6PlpU TCEyVE82FMkpPzr5u1jQS6lTjdbrDB3/QL4yCPG/A2mv+GyHauOLJ/k+qeDW0RO5cCNPMPqC30q GC8mcEaZkjTElOg== X-Received: by 2002:a17:906:d153:: with SMTP id br19mr21277746ejb.360.1615314459130; Tue, 09 Mar 2021 10:27:39 -0800 (PST) X-Google-Smtp-Source: ABdhPJxLats5W3APgVrCWb8bH+0UD+CISMfkO/qRWdUZY0wkuB5iJH4fb0jzlaNbjb+fyMpFWnMd/A== X-Received: by 2002:a17:906:d153:: with SMTP id br19mr21277714ejb.360.1615314458838; Tue, 09 Mar 2021 10:27:38 -0800 (PST) From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Cc: Laurent Vivier , Dmitry Fleytman , Miroslav Rezanina , Li Qiang , Paolo Bonzini , Jason Wang , Thomas Huth , Alexander Bulekov , Stefano Garzarella , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , qemu-stable@nongnu.org Subject: [PATCH v4 4/6] net/eth: Check rt_hdr size before casting to ip6_ext_hdr Date: Tue, 9 Mar 2021 19:27:07 +0100 Message-Id: <20210309182709.810955-5-philmd@redhat.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210309182709.810955-1-philmd@redhat.com> References: <20210309182709.810955-1-philmd@redhat.com> MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=philmd@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @redhat.com) Do not cast our ip6_ext_hdr pointer to ip6_ext_hdr_routing if there isn't enough data in the buffer for a such structure. This fix a 2 bytes buffer overrun in eth_parse_ipv6_hdr() reported by QEMU fuzzer: $ cat << EOF | ./qemu-system-i386 -M pc-q35-5.0 \ -accel qtest -monitor none \ -serial none -nographic -qtest stdio outl 0xcf8 0x80001010 outl 0xcfc 0xe1020000 outl 0xcf8 0x80001004 outw 0xcfc 0x7 write 0x25 0x1 0x86 write 0x26 0x1 0xdd write 0x4f 0x1 0x2b write 0xe1020030 0x4 0x190002e1 write 0xe102003a 0x2 0x0807 write 0xe1020048 0x4 0x12077cdd write 0xe1020400 0x4 0xba077cdd write 0xe1020420 0x4 0x190002e1 write 0xe1020428 0x4 0x3509d807 write 0xe1020438 0x1 0xe2 EOF =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D2859770=3D=3DERROR: AddressSanitizer: stack-buffer-overflow on addr= ess 0x7ffdef904902 at pc 0x561ceefa78de bp 0x7ffdef904820 sp 0x7ffdef904818 READ of size 1 at 0x7ffdef904902 thread T0 #0 0x561ceefa78dd in _eth_get_rss_ex_dst_addr net/eth.c:410:17 #1 0x561ceefa41fb in eth_parse_ipv6_hdr net/eth.c:532:17 #2 0x561cef7de639 in net_tx_pkt_parse_headers hw/net/net_tx_pkt.c:228= :14 #3 0x561cef7dbef4 in net_tx_pkt_parse hw/net/net_tx_pkt.c:273:9 #4 0x561ceec29f22 in e1000e_process_tx_desc hw/net/e1000e_core.c:730:= 29 #5 0x561ceec28eac in e1000e_start_xmit hw/net/e1000e_core.c:927:9 #6 0x561ceec1baab in e1000e_set_tdt hw/net/e1000e_core.c:2444:9 #7 0x561ceebf300e in e1000e_core_write hw/net/e1000e_core.c:3256:9 #8 0x561cef3cd4cd in e1000e_mmio_write hw/net/e1000e.c:110:5 Address 0x7ffdef904902 is located in stack of thread T0 at offset 34 in f= rame #0 0x561ceefa320f in eth_parse_ipv6_hdr net/eth.c:486 This frame has 1 object(s): [32, 34) 'ext_hdr' (line 487) <=3D=3D Memory access at offset 34 over= flows this variable HINT: this may be a false positive if your program uses some custom stack= unwind mechanism, swapcontext or vfork (longjmp and C++ exceptions *are* supported) SUMMARY: AddressSanitizer: stack-buffer-overflow net/eth.c:410:17 in _eth= _get_rss_ex_dst_addr Shadow bytes around the buggy address: 0x10003df188d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10003df188e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10003df188f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10003df18900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10003df18910: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 =3D>0x10003df18920:[02]f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 0x10003df18930: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10003df18940: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10003df18950: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10003df18960: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x10003df18970: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Stack left redzone: f1 Stack right redzone: f3 =3D=3D2859770=3D=3DABORTING Add the corresponding qtest case with the fuzzer reproducer. FWIW GCC 11 similarly reported: net/eth.c: In function 'eth_parse_ipv6_hdr': net/eth.c:410:15: error: array subscript 'struct ip6_ext_hdr_routing[0]' = is partly outside array bounds of 'struct ip6_ext_hdr[1]' [-Werror=3Darray-= bounds] 410 | if ((rthdr->rtype =3D=3D 2) && (rthdr->segleft =3D=3D 1)) { | ~~~~~^~~~~~~ net/eth.c:485:24: note: while referencing 'ext_hdr' 485 | struct ip6_ext_hdr ext_hdr; | ^~~~~~~ net/eth.c:410:38: error: array subscript 'struct ip6_ext_hdr_routing[0]' = is partly outside array bounds of 'struct ip6_ext_hdr[1]' [-Werror=3Darray-= bounds] 410 | if ((rthdr->rtype =3D=3D 2) && (rthdr->segleft =3D=3D 1)) { | ~~~~~^~~~~~~~~ net/eth.c:485:24: note: while referencing 'ext_hdr' 485 | struct ip6_ext_hdr ext_hdr; | ^~~~~~~ Cc: qemu-stable@nongnu.org Buglink: https://bugs.launchpad.net/qemu/+bug/1879531 Reported-by: Alexander Bulekov Reported-by: Miroslav Rezanina Fixes: eb700029c78 ("net_pkt: Extend packet abstraction as required by e100= 0e functionality") Signed-off-by: Philippe Mathieu-Daud=C3=A9 --- net/eth.c | 7 ++++- tests/qtest/fuzz-e1000e-test.c | 53 ++++++++++++++++++++++++++++++++++ MAINTAINERS | 1 + tests/qtest/meson.build | 1 + 4 files changed, 61 insertions(+), 1 deletion(-) create mode 100644 tests/qtest/fuzz-e1000e-test.c diff --git a/net/eth.c b/net/eth.c index 77af2b673bb..f0c8dfe8df7 100644 --- a/net/eth.c +++ b/net/eth.c @@ -406,7 +406,12 @@ _eth_get_rss_ex_dst_addr(const struct iovec *pkt, int = pkt_frags, struct in6_address *dst_addr) { size_t input_size =3D iov_size(pkt, pkt_frags); - struct ip6_ext_hdr_routing *rthdr =3D (struct ip6_ext_hdr_routing *) e= xt_hdr; + struct ip6_ext_hdr_routing *rthdr; + + if (input_size < ext_hdr_offset + sizeof(*rthdr)) { + return false; + } + rthdr =3D (struct ip6_ext_hdr_routing *) ext_hdr; =20 if ((rthdr->rtype =3D=3D 2) && (rthdr->segleft =3D=3D 1)) { size_t bytes_read; diff --git a/tests/qtest/fuzz-e1000e-test.c b/tests/qtest/fuzz-e1000e-test.c new file mode 100644 index 00000000000..66229e60964 --- /dev/null +++ b/tests/qtest/fuzz-e1000e-test.c @@ -0,0 +1,53 @@ +/* + * QTest testcase for e1000e device generated by fuzzer + * + * Copyright (c) 2021 Red Hat, Inc. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" + +#include "libqos/libqtest.h" + +/* + * https://bugs.launchpad.net/qemu/+bug/1879531 + */ +static void test_lp1879531_eth_get_rss_ex_dst_addr(void) +{ + QTestState *s; + + s =3D qtest_init("-nographic -monitor none -serial none -M pc-q35-5.0"= ); + + qtest_outl(s, 0xcf8, 0x80001010); + qtest_outl(s, 0xcfc, 0xe1020000); + qtest_outl(s, 0xcf8, 0x80001004); + qtest_outw(s, 0xcfc, 0x7); + qtest_writeb(s, 0x25, 0x86); + qtest_writeb(s, 0x26, 0xdd); + qtest_writeb(s, 0x4f, 0x2b); + + qtest_writel(s, 0xe1020030, 0x190002e1); + qtest_writew(s, 0xe102003a, 0x0807); + qtest_writel(s, 0xe1020048, 0x12077cdd); + qtest_writel(s, 0xe1020400, 0xba077cdd); + qtest_writel(s, 0xe1020420, 0x190002e1); + qtest_writel(s, 0xe1020428, 0x3509d807); + qtest_writeb(s, 0xe1020438, 0xe2); + qtest_writeb(s, 0x4f, 0x2b); + qtest_quit(s); +} + +int main(int argc, char **argv) +{ + const char *arch =3D qtest_get_arch(); + + g_test_init(&argc, &argv, NULL); + + if (strcmp(arch, "i386") =3D=3D 0 || strcmp(arch, "x86_64") =3D=3D 0) { + qtest_add_func("fuzz/test_lp1879531_eth_get_rss_ex_dst_addr", + test_lp1879531_eth_get_rss_ex_dst_addr); + } + + return g_test_run(); +} diff --git a/MAINTAINERS b/MAINTAINERS index f22d83c1782..4eb5784ff83 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2003,6 +2003,7 @@ e1000e M: Dmitry Fleytman S: Maintained F: hw/net/e1000e* +F: tests/qtest/fuzz-e1000e-test.c =20 eepro100 M: Stefan Weil diff --git a/tests/qtest/meson.build b/tests/qtest/meson.build index 58efc46144e..7997d895449 100644 --- a/tests/qtest/meson.build +++ b/tests/qtest/meson.build @@ -60,6 +60,7 @@ (config_all_devices.has_key('CONFIG_TPM_TIS_ISA') ? ['tpm-tis-test'] : [= ]) + \ (config_all_devices.has_key('CONFIG_TPM_TIS_ISA') ? ['tpm-tis-swtpm-test= '] : []) + \ (config_all_devices.has_key('CONFIG_RTL8139_PCI') ? ['rtl8139-test'] : [= ]) + \ + (config_all_devices.has_key('CONFIG_E1000E_PCI_EXPRESS') ? ['fuzz-e1000e= -test'] : []) + \ qtests_pci + = \ ['fdc-test', 'ide-test', --=20 2.26.2