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authorMark H Weaver <mhw@netris.org>2015-06-10 15:11:48 -0400
committerMark H Weaver <mhw@netris.org>2015-06-10 15:42:16 -0400
commit3dbb0e5f8b9e8445818ca31861488666b948ce50 (patch)
treefc2c818648077e3222918efcfcc16d4bc44c6671 /gnu/packages/patches/qemu-CVE-2015-3209.patch
parente51943f886dd65dd9cd8c1f16e67d5775ffc08bd (diff)
downloadguix-3dbb0e5f8b9e8445818ca31861488666b948ce50.tar
guix-3dbb0e5f8b9e8445818ca31861488666b948ce50.tar.gz
gnu: qemu: Add fix for CVE-2015-3209.
* gnu/packages/patches/qemu-CVE-2015-3209.patch: New file. * gnu-system.am (dist_patch_DATA): Add it. * gnu/packages/qemu.scm (qemu): Add patch.
Diffstat (limited to 'gnu/packages/patches/qemu-CVE-2015-3209.patch')
-rw-r--r--gnu/packages/patches/qemu-CVE-2015-3209.patch49
1 files changed, 49 insertions, 0 deletions
diff --git a/gnu/packages/patches/qemu-CVE-2015-3209.patch b/gnu/packages/patches/qemu-CVE-2015-3209.patch
new file mode 100644
index 0000000000..0bb726698c
--- /dev/null
+++ b/gnu/packages/patches/qemu-CVE-2015-3209.patch
@@ -0,0 +1,49 @@
+From 9f7c594c006289ad41169b854d70f5da6e400a2a Mon Sep 17 00:00:00 2001
+From: Petr Matousek <pmatouse@redhat.com>
+Date: Sun, 24 May 2015 10:53:44 +0200
+Subject: [PATCH] pcnet: force the buffer access to be in bounds during tx
+
+4096 is the maximum length per TMD and it is also currently the size of
+the relay buffer pcnet driver uses for sending the packet data to QEMU
+for further processing. With packet spanning multiple TMDs it can
+happen that the overall packet size will be bigger than sizeof(buffer),
+which results in memory corruption.
+
+Fix this by only allowing to queue maximum sizeof(buffer) bytes.
+
+This is CVE-2015-3209.
+
+[Fixed 3-space indentation to QEMU's 4-space coding standard.
+--Stefan]
+
+Signed-off-by: Petr Matousek <pmatouse@redhat.com>
+Reported-by: Matt Tait <matttait@google.com>
+Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
+Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
+Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
+---
+ hw/net/pcnet.c | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+diff --git a/hw/net/pcnet.c b/hw/net/pcnet.c
+index bdfd38f..68b9981 100644
+--- a/hw/net/pcnet.c
++++ b/hw/net/pcnet.c
+@@ -1241,6 +1241,14 @@ static void pcnet_transmit(PCNetState *s)
+ }
+
+ bcnt = 4096 - GET_FIELD(tmd.length, TMDL, BCNT);
++
++ /* if multi-tmd packet outsizes s->buffer then skip it silently.
++ Note: this is not what real hw does */
++ if (s->xmit_pos + bcnt > sizeof(s->buffer)) {
++ s->xmit_pos = -1;
++ goto txdone;
++ }
++
+ s->phys_mem_read(s->dma_opaque, PHYSADDR(s, tmd.tbadr),
+ s->buffer + s->xmit_pos, bcnt, CSR_BSWP(s));
+ s->xmit_pos += bcnt;
+--
+2.2.1
+