qemu: Security fix CVE-2016-1568

CVE-2016-1568 Qemu: ide: ahci use-after-free vulnerability in aio port commands

(From OE-Core rev: 166c19df8be28da255cc68032e2d11afc59d4197)

(From OE-Core rev: c2361dd9bb663b00dd194cb7fdb0e07d7e1ab5e1)

Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 47 insertions, 0 deletions

diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2016-1568.patch b/meta/recipes-devtools/qemu/qemu/CVE-2016-1568.patch
new file mode 100644
index 0000000000..319ae24e15
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/CVE-2016-1568.patch
@@ -0,0 +1,46 @@
+From 4ab0359a8ae182a7ac5c99609667273167703fab Mon Sep 17 00:00:00 2001
+From: Prasad J Pandit <pjp@fedoraproject.org>
+Date: Mon, 11 Jan 2016 14:10:42 -0500
+Subject: [PATCH] ide: ahci: reset ncq object to unused on error
+
+When processing NCQ commands, AHCI device emulation prepares a
+NCQ transfer object; To which an aio control block(aiocb) object
+is assigned in 'execute_ncq_command'. In case, when the NCQ
+command is invalid, the 'aiocb' object is not assigned, and NCQ
+transfer object is left as 'used'. This leads to a use after
+free kind of error in 'bdrv_aio_cancel_async' via 'ahci_reset_port'.
+Reset NCQ transfer object to 'unused' to avoid it.
+
+[Maintainer edit: s/ACHI/AHCI/ in the commit message. --js]
+
+Reported-by: Qinghao Tang <luodalongde@gmail.com>
+Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
+Reviewed-by: John Snow <jsnow@redhat.com>
+Message-id: 1452282511-4116-1-git-send-email-ppandit@redhat.com
+Signed-off-by: John Snow <jsnow@redhat.com>
+
+Upstream-Status: Backport
+
+http://git.qemu.org/?p=qemu.git;a=commit;h=4ab0359a8ae182a7ac5c99609667273167703fab
+
+CVE: CVE-2016-1568
+[Yocto # 9013]
+
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ hw/ide/ahci.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+Index: qemu-2.2.0/hw/ide/ahci.c
+===================================================================
+--- qemu-2.2.0.orig/hw/ide/ahci.c
++++ qemu-2.2.0/hw/ide/ahci.c
+@@ -838,6 +838,7 @@ static void ncq_cb(void *opaque, int ret
+         ide_state->error = ABRT_ERR;
+         ide_state->status = READY_STAT | ERR_STAT;
+         ncq_tfs->drive->port_regs.scr_err |= (1 << ncq_tfs->tag);
++        ncq_tfs->used = 0;
+     } else {
+         ide_state->status = READY_STAT | SEEK_STAT;
+     }
diff --git a/meta/recipes-devtools/qemu/qemu_2.2.0.bb b/meta/recipes-devtools/qemu/qemu_2.2.0.bb
index 72fda62264..66e928faf9 100644
--- a/meta/recipes-devtools/qemu/qemu_2.2.0.bb
+++ b/meta/recipes-devtools/qemu/qemu_2.2.0.bb
@@ -24,6 +24,7 @@ SRC_URI += "file://configure-fix-Darwin-target-detection.patch \
             file://CVE-2015-7504.patch \
             file://CVE-2015-7512.patch \
             file://CVE-2015-8345.patch \
+            file://CVE-2016-1568.patch \
            "
 SRC_URI_prepend = "http://wiki.qemu-project.org/download/${BP}.tar.bz2"
 SRC_URI[md5sum] = "f7a5e2da22d057eb838a91da7aff43c8"