From 89d32a19f14934bac61bb80955b8b29ac1ac9109 Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Thu, 11 Apr 2024 15:06:01 +0200
Subject: [PATCH] qcow2: Don't open data_file with BDRV_O_NO_IO (CVE-2024-4467)

One use case for 'qemu-img info' is verifying that untrusted images
don't reference an unwanted external file, be it as a backing file or an
external data file. To make sure that calling 'qemu-img info' can't
already have undesired side effects with a malicious image, just don't
open the data file at all with BDRV_O_NO_IO. If nothing ever tries to do
I/O, we don't need to have it open.

This changes the output of iotests case 061, which used 'qemu-img info'
to show that opening an image with an invalid data file fails. After
this patch, it succeeds. Replace this part of the test with a qemu-io
call, but keep the final 'qemu-img info' to show that the invalid data
file is correctly displayed in the output.

Fixes: CVE-2024-4467
Cc: qemu-stable@nongnu.org
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Hanna Czenczek <hreitz@redhat.com>
---
 block/qcow2.c              | 17 ++++++++++++++++-
 tests/qemu-iotests/061     |  6 ++++--
 tests/qemu-iotests/061.out |  8 ++++++--
 3 files changed, 26 insertions(+), 5 deletions(-)

diff --git a/block/qcow2.c b/block/qcow2.c
index 8e1b5ffe2d..c1992c571a 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1492,7 +1492,22 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options,
         goto fail;
     }
 
-    if (open_data_file) {
+    if (open_data_file && (flags & BDRV_O_NO_IO)) {
+        /*
+         * Don't open the data file for 'qemu-img info' so that it can be used
+         * to verify that an untrusted qcow2 image doesn't refer to external
+         * files.
+         *
+         * Note: This still makes has_data_file() return true.
+         */
+        if (s->incompatible_features & QCOW2_INCOMPAT_DATA_FILE) {
+            s->data_file = NULL;
+        } else {
+            s->data_file = bs->file;
+        }
+        qdict_extract_subqdict(options, NULL, "data-file.");
+        qdict_del(options, "data-file");
+    } else if (open_data_file) {
         /* Open external data file */
         s->data_file = bdrv_open_child(NULL, options, "data-file", bs,
                                        &child_file, true, &local_err);
diff --git a/tests/qemu-iotests/061 b/tests/qemu-iotests/061
index d7dbd7e2c7..ff8ca908d0 100755
--- a/tests/qemu-iotests/061
+++ b/tests/qemu-iotests/061
@@ -268,12 +268,14 @@ $QEMU_IMG amend -o "data_file=foo" "$TEST_IMG"
 echo
 IMGOPTS="compat=1.1,data_file=$TEST_IMG.data" _make_test_img 64M
 $QEMU_IMG amend -o "data_file=foo" "$TEST_IMG"
-_img_info --format-specific
+$QEMU_IO -c "read 0 4k" "$TEST_IMG" 2>&1 | _filter_testdir | _filter_imgfmt
+$QEMU_IO -c "open -o data-file.filename=$TEST_IMG.data,file.filename=$TEST_IMG" -c "read 0 4k" | _filter_qemu_io
 TEST_IMG="data-file.filename=$TEST_IMG.data,file.filename=$TEST_IMG" _img_info --format-specific --image-opts
 
 echo
 $QEMU_IMG amend -o "data_file=" --image-opts "data-file.filename=$TEST_IMG.data,file.filename=$TEST_IMG"
-_img_info --format-specific
+$QEMU_IO -c "read 0 4k" "$TEST_IMG" 2>&1 | _filter_testdir | _filter_imgfmt
+$QEMU_IO -c "open -o data-file.filename=$TEST_IMG.data,file.filename=$TEST_IMG" -c "read 0 4k" | _filter_qemu_io
 TEST_IMG="data-file.filename=$TEST_IMG.data,file.filename=$TEST_IMG" _img_info --format-specific --image-opts
 
 echo
diff --git a/tests/qemu-iotests/061.out b/tests/qemu-iotests/061.out
index 1aa7d37ff9..8c6f1dbde3 100644
--- a/tests/qemu-iotests/061.out
+++ b/tests/qemu-iotests/061.out
@@ -512,7 +512,9 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
 qemu-img: data-file can only be set for images that use an external data file
 
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 data_file=TEST_DIR/t.IMGFMT.data
-qemu-img: Could not open 'TEST_DIR/t.IMGFMT': Could not open 'foo': No such file or directory
+qemu-io: can't open device TEST_DIR/t.IMGFMT: Could not open 'foo': No such file or directory
+read 4096/4096 bytes at offset 0
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 image: TEST_DIR/t.IMGFMT
 file format: IMGFMT
 virtual size: 64 MiB (67108864 bytes)
@@ -525,7 +527,9 @@ Format specific information:
     data file raw: false
     corrupt: false
 
-qemu-img: Could not open 'TEST_DIR/t.IMGFMT': 'data-file' is required for this image
+qemu-io: can't open device TEST_DIR/t.IMGFMT: 'data-file' is required for this image
+read 4096/4096 bytes at offset 0
+4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 image: TEST_DIR/t.IMGFMT
 file format: IMGFMT
 virtual size: 64 MiB (67108864 bytes)
-- 
2.41.0.windows.1

