nbdkit: patch CVE-2025-47712

Details: https://nvd.nist.gov/vuln/detail/CVE-2025-47712

Pick the patch from the project's repository which explicitly
mentions this vulnerability ID.

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>

2 files changed, 163 insertions, 0 deletions

diff --git a/meta-networking/recipes-support/nbdkit/nbdkit/CVE-2025-47712.patch b/meta-networking/recipes-support/nbdkit/nbdkit/CVE-2025-47712.patch
new file mode 100644
index 0000000000..84b0ad89f2
--- /dev/null
+++ b/meta-networking/recipes-support/nbdkit/nbdkit/CVE-2025-47712.patch
@@ -0,0 +1,162 @@
+From 4290f04d6fd9321fffcf09c0507a4f394e19f087 Mon Sep 17 00:00:00 2001
+From: Eric Blake <eblake@redhat.com>
+Date: Tue, 22 Apr 2025 19:53:39 -0500
+Subject: [PATCH] blocksize: Fix 32-bit overflow in .extents [CVE-2025-47712]
+
+If the original request is larger than 2**32 - minblock, then we were
+calling nbdkit_extents_aligned() with a count that rounded up then
+overflowed to 0 instead of the intended 4G because of overflowing a
+32-bit type, which in turn causes an assertion failure:
+
+nbdkit: ../../server/backend.c:814: backend_extents: Assertion `backend_valid_range (c, offset, count)' failed.
+
+The fix is to force the rounding to be in a 64-bit type from the
+get-go.
+
+The ability for a well-behaved client to cause the server to die from
+an assertion failure can be used as a denial of service attack against
+other clients.  Mitigations: if you requrire the use of TLS, then you
+can ensure that you only have trusted clients that won't trigger a
+block status call that large.  Also, the problem only occurs when
+using the blocksize filter, although setting the filter's maxlen
+parameter to a smaller value than its default of 2**32-1 does not
+help.
+
+Fixes: 2680be00 ('blocksize: Fix .extents when plugin changes type within minblock', v1.21.16)
+Signed-off-by: Eric Blake <eblake@redhat.com>
+Message-ID: <20250423210917.1784789-3-eblake@redhat.com>
+Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
+
+CVE: CVE-2025-47712
+Upstream-Status: Backport [https://gitlab.com/nbdkit/nbdkit/-/commit/a486f88d1eea653ea88b0bf8804c4825dab25ec7]
+Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
+---
+ filters/blocksize/blocksize.c            |  5 +-
+ tests/Makefile.am                        |  2 +
+ tests/test-blocksize-extents-overflow.sh | 83 ++++++++++++++++++++++++
+ 3 files changed, 88 insertions(+), 2 deletions(-)
+ create mode 100755 tests/test-blocksize-extents-overflow.sh
+
+diff --git a/filters/blocksize/blocksize.c b/filters/blocksize/blocksize.c
+index 03da4971..b06f78b3 100644
+--- a/filters/blocksize/blocksize.c
++++ b/filters/blocksize/blocksize.c
+@@ -474,8 +474,9 @@ blocksize_extents (nbdkit_next *next,
+     return -1;
+   }
+ 
+-  if (nbdkit_extents_aligned (next, MIN (ROUND_UP (count, h->minblock),
+-                                         h->maxlen),
++  if (nbdkit_extents_aligned (next,
++                              MIN (ROUND_UP ((uint64_t) count, h->minblock),
++                                   h->maxlen),
+                               ROUND_DOWN (offset, h->minblock), flags,
+                               h->minblock, extents2, err) == -1)
+     return -1;
+diff --git a/tests/Makefile.am b/tests/Makefile.am
+index 8ddf73d1..a38a37bc 100644
+--- a/tests/Makefile.am
++++ b/tests/Makefile.am
+@@ -1415,11 +1415,13 @@ test_layers_filter3_la_LIBADD = $(IMPORT_LIBRARY_ON_WINDOWS)
+ TESTS += \
+        test-blocksize.sh \
+        test-blocksize-extents.sh \
++       test-blocksize-extents-overflow.sh \
+        test-blocksize-default.sh \
+        $(NULL)
+ EXTRA_DIST += \
+        test-blocksize.sh \
+        test-blocksize-extents.sh \
++       test-blocksize-extents-overflow.sh \
+        test-blocksize-default.sh \
+        $(NULL)
+ 
+diff --git a/tests/test-blocksize-extents-overflow.sh b/tests/test-blocksize-extents-overflow.sh
+new file mode 100755
+index 00000000..844c3999
+--- /dev/null
++++ b/tests/test-blocksize-extents-overflow.sh
+@@ -0,0 +1,83 @@
++#!/usr/bin/env bash
++# nbdkit
++# Copyright Red Hat
++#
++# Redistribution and use in source and binary forms, with or without
++# modification, are permitted provided that the following conditions are
++# met:
++#
++# * Redistributions of source code must retain the above copyright
++# notice, this list of conditions and the following disclaimer.
++#
++# * Redistributions in binary form must reproduce the above copyright
++# notice, this list of conditions and the following disclaimer in the
++# documentation and/or other materials provided with the distribution.
++#
++# * Neither the name of Red Hat nor the names of its contributors may be
++# used to endorse or promote products derived from this software without
++# specific prior written permission.
++#
++# THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
++# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
++# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
++# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
++# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
++# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
++# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
++# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
++# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
++# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
++# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
++# SUCH DAMAGE.
++
++# Demonstrate a fix for a bug where blocksize overflowed 32 bits
++
++source ./functions.sh
++set -e
++set -x
++
++requires_run
++requires_plugin eval
++requires_nbdsh_uri
++requires nbdsh --base-allocation --version
++
++# Script a sparse server that requires 512-byte aligned requests.
++exts='
++if test $(( ($3|$4) & 511 )) != 0; then
++  echo "EINVAL request unaligned" 2>&1
++  exit 1
++fi
++echo 0 5G 0
++'
++
++# We also need an nbdsh script to parse all extents, coalescing adjacent
++# types for simplicity.
++# FIXME: Once nbdkit plugin version 3 allows 64-bit block extents, run
++# this test twice, once for each bit size (32-bit needs 2 extents, 64-bit
++# will get the same result with only 1 extent).
++export script='
++size = h.get_size()
++offs = 0
++entries = []
++def f(metacontext, offset, e, err):
++    global entries
++    global offs
++    assert offs == offset
++    for length, flags in zip(*[iter(e)] * 2):
++        if entries and flags == entries[-1][1]:
++            entries[-1] = (entries[-1][0] + length, flags)
++        else:
++            entries.append((length, flags))
++        offs = offs + length
++
++# Test a loop over the entire device
++while offs < size:
++    len = min(size - offs, 2**32-1)
++    h.block_status(len, offs, f)
++assert entries == [(5 * 2**30, 0)]
++'
++
++# Now run everything
++nbdkit --filter=blocksize eval minblock=512 \
++       get_size='echo 5G' pread='exit 1' extents="$exts" \
++       --run 'nbdsh --base-allocation -u "$uri" -c "$script"'
diff --git a/meta-networking/recipes-support/nbdkit/nbdkit_1.30.2.bb b/meta-networking/recipes-support/nbdkit/nbdkit_1.30.2.bb
index d5b51f0e8d..7996c43752 100644
--- a/meta-networking/recipes-support/nbdkit/nbdkit_1.30.2.bb
+++ b/meta-networking/recipes-support/nbdkit/nbdkit_1.30.2.bb
@@ -11,6 +11,7 @@ LIC_FILES_CHKSUM = "file://LICENSE;md5=f9dcc2d8acdde215fa4bd6ac12bb14f0"
 
 SRC_URI = "git://github.com/libguestfs/nbdkit.git;protocol=https;branch=master \
            file://CVE-2025-47711.patch \
+           file://CVE-2025-47712.patch \
            "
 
 SRCREV = "b59380e061fdf0f114c13c226ea2a508f2c067d0"