From: Armin Kuster <akus...@mvista.com> Source: qemu.org MR: 107262 Type: Security Fix Disposition: Backport from https://git.qemu.org/?p=qemu.git;a=commit;h=c2cb511634012344e3d0fe49a037a33b12d8a98a ChangeID: 3024b894ab045c1a74ab2276359d5e599ec9e822 Description:
Affects qemu < 5.0.0 Signed-off-by: Armin Kuster <akus...@mvista.com> --- meta/recipes-devtools/qemu/qemu.inc | 1 + .../qemu/qemu/CVE-2020-28916.patch | 48 +++++++++++++++++++ 2 files changed, 49 insertions(+) create mode 100644 meta/recipes-devtools/qemu/qemu/CVE-2020-28916.patch diff --git a/meta/recipes-devtools/qemu/qemu.inc b/meta/recipes-devtools/qemu/qemu.inc index 3113d638d7..211c03e57b 100644 --- a/meta/recipes-devtools/qemu/qemu.inc +++ b/meta/recipes-devtools/qemu/qemu.inc @@ -90,6 +90,7 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \ file://CVE-2020-12829_4.patch \ file://CVE-2020-12829_5.patch \ file://CVE-2020-27617.patch \ + file://CVE-2020-28916.patch \ " UPSTREAM_CHECK_REGEX = "qemu-(?P<pver>\d+(\.\d+)+)\.tar" diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2020-28916.patch b/meta/recipes-devtools/qemu/qemu/CVE-2020-28916.patch new file mode 100644 index 0000000000..756b1c1495 --- /dev/null +++ b/meta/recipes-devtools/qemu/qemu/CVE-2020-28916.patch @@ -0,0 +1,48 @@ +From c2cb511634012344e3d0fe49a037a33b12d8a98a Mon Sep 17 00:00:00 2001 +From: Prasad J Pandit <p...@fedoraproject.org> +Date: Wed, 11 Nov 2020 18:36:36 +0530 +Subject: [PATCH] hw/net/e1000e: advance desc_offset in case of null descriptor + +While receiving packets via e1000e_write_packet_to_guest() routine, +'desc_offset' is advanced only when RX descriptor is processed. And +RX descriptor is not processed if it has NULL buffer address. +This may lead to an infinite loop condition. Increament 'desc_offset' +to process next descriptor in the ring to avoid infinite loop. + +Reported-by: Cheol-woo Myung <330cj...@gmail.com> +Signed-off-by: Prasad J Pandit <p...@fedoraproject.org> +Signed-off-by: Jason Wang <jasow...@redhat.com> + +Upstream-Status: Backport +CVE: CVE-2020-28916 +Signed-off-by: Armin Kuster <akus...@mvista.com> + +--- + hw/net/e1000e_core.c | 8 ++++---- + 1 file changed, 4 insertions(+), 4 deletions(-) + +diff --git a/hw/net/e1000e_core.c b/hw/net/e1000e_core.c +index d8b9e4b2f4..095c01ebc6 100644 +--- a/hw/net/e1000e_core.c ++++ b/hw/net/e1000e_core.c +@@ -1596,13 +1596,13 @@ e1000e_write_packet_to_guest(E1000ECore *core, struct NetRxPkt *pkt, + (const char *) &fcs_pad, e1000x_fcs_len(core->mac)); + } + } +- desc_offset += desc_size; +- if (desc_offset >= total_size) { +- is_last = true; +- } + } else { /* as per intel docs; skip descriptors with null buf addr */ + trace_e1000e_rx_null_descriptor(); + } ++ desc_offset += desc_size; ++ if (desc_offset >= total_size) { ++ is_last = true; ++ } + + e1000e_write_rx_descr(core, desc, is_last ? core->rx_pkt : NULL, + rss_info, do_ps ? ps_hdr_len : 0, &bastate.written); +-- +2.25.1 + -- 2.25.1
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