qemu: fix CVE-2021-3930

(From OE-Core rev: f0504578174f77ba231c72801fb5a295869a40d1)

Signed-off-by: Sakib Sajal <sakib.sajal@windriver.com>
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 54 insertions, 0 deletions

diff --git a/meta/recipes-devtools/qemu/qemu.inc b/meta/recipes-devtools/qemu/qemu.inc
index 5c1c88db25..35aa3e1d7e 100644
--- a/meta/recipes-devtools/qemu/qemu.inc
+++ b/meta/recipes-devtools/qemu/qemu.inc
@@ -72,6 +72,7 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \
            file://CVE-2021-3682.patch \
            file://CVE-2021-3713.patch \
            file://CVE-2021-3748.patch \
+           file://CVE-2021-3930.patch \
            "
 UPSTREAM_CHECK_REGEX = "qemu-(?P<pver>\d+(\.\d+)+)\.tar"
 
diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2021-3930.patch b/meta/recipes-devtools/qemu/qemu/CVE-2021-3930.patch
new file mode 100644
index 0000000000..bfbe5cee33
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/CVE-2021-3930.patch
@@ -0,0 +1,53 @@
+From cdca50eff9c38367be54f92839734ab490c8b0f7 Mon Sep 17 00:00:00 2001
+From: Mauro Matteo Cascella <mcascell@redhat.com>
+Date: Thu, 4 Nov 2021 17:31:38 +0100
+Subject: [PATCH 10/12] hw/scsi/scsi-disk: MODE_PAGE_ALLS not allowed in MODE
+ SELECT commands
+
+This avoids an off-by-one read of 'mode_sense_valid' buffer in
+hw/scsi/scsi-disk.c:mode_sense_page().
+
+Fixes: CVE-2021-3930
+Cc: qemu-stable@nongnu.org
+Reported-by: Alexander Bulekov <alxndr@bu.edu>
+Fixes: a8f4bbe2900 ("scsi-disk: store valid mode pages in a table")
+Fixes: #546
+Reported-by: Qiuhao Li <Qiuhao.Li@outlook.com>
+Signed-off-by: Mauro Matteo Cascella <mcascell@redhat.com>
+Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
+
+Upstream-Status: Backport [b3af7fdf9cc537f8f0dd3e2423d83f5c99a457e8]
+CVE: CVE-2021-3930
+
+Signed-off-by: Sakib Sajal <sakib.sajal@windriver.com>
+---
+ hw/scsi/scsi-disk.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
+index 90841ad79..5b44ed7d8 100644
+--- a/hw/scsi/scsi-disk.c
++++ b/hw/scsi/scsi-disk.c
+@@ -1100,6 +1100,7 @@ static int mode_sense_page(SCSIDiskState *s, int page, uint8_t **p_outbuf,
+     uint8_t *p = *p_outbuf + 2;
+     int length;
+ 
++    assert(page < ARRAY_SIZE(mode_sense_valid));
+     if ((mode_sense_valid[page] & (1 << s->qdev.type)) == 0) {
+         return -1;
+     }
+@@ -1441,6 +1442,11 @@ static int scsi_disk_check_mode_select(SCSIDiskState *s, int page,
+         return -1;
+     }
+ 
++    /* MODE_PAGE_ALLS is only valid for MODE SENSE commands */
++    if (page == MODE_PAGE_ALLS) {
++        return -1;
++    }
++
+     p = mode_current;
+     memset(mode_current, 0, inlen + 2);
+     len = mode_sense_page(s, page, &p, 0);
+-- 
+2.31.1
+