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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1785879296; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=oIcXhy5cA9NuGWYjtrWIBd+IbtKZ6jHa4Wyv3pYM5bk=; b=V5QATnorNYq9TsbNL7zNuBbyZx3fChtq5SuK1KcK+A3dzOLD6VCNePjMth6u2sW9ciNPoV rosjtqU9NhE7MFS5pu1QQKscWnbu4FxgM6PZtySvRpyR2/uE5mvdxRuqbiS8+JlK0AyMwA VJe4Db98Ai7hpahZCRynrPRzt832Sc4= X-MC-Unique: ISPjzIu-M7CHtxjCaYXg5g-1 X-Mimecast-MFC-AGG-ID: ISPjzIu-M7CHtxjCaYXg5g_1785879289 To: devel@lists.libvirt.org Subject: [PATCH 1/2] virstoragetest: Add example of a qcow2 image with a backing image pointing to a data_file without 'backing_format' Date: Tue, 4 Aug 2026 23:34:44 +0200 Message-ID: <29d8d6bb1f2348f7c7c8b56e33b3663e21d81ece.1785879137.git.pkrempa@redhat.com> In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: YCLYgAeqKGEVlxeyUl-SsGkRZ2Ij6K4a6E4cnN1l7_k_1785879289 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Message-ID-Hash: 63QSYI453MNVASJV6GXYWARWAR2YMQ6T X-Message-ID-Hash: 63QSYI453MNVASJV6GXYWARWAR2YMQ6T X-MailFrom: pkrempa@redhat.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; header-match-devel.lists.libvirt.org-0; emergency; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.10 Precedence: list List-Id: Development discussions about the libvirt library & tools Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: Peter Krempa via Devel Reply-To: Peter Krempa X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1785879503193158500 Content-Type: text/plain; charset="utf-8" From: Peter Krempa Add an image example which specifies a 'backing_file' without 'backing_format' and the backing file has 'data_file'. This was obtained by running a hacked qemu-img with bypassed requirement to specify backing file format: $ qemu-img create -f qcow2 -b datafile.qcow2 -u qcow2_datafile-auto.qcow2= 1024 In the test directory. Signed-off-by: Peter Krempa Reviewed-by: J=C3=A1n Tomko --- tests/virstoragetest.c | 7 +++- .../images/qcow2_datafile-auto.qcow2 | Bin 0 -> 196616 bytes .../qcow2datafile-qcow2_qcow2-datafile-auto | 31 ++++++++++++++++++ 3 files changed, 37 insertions(+), 1 deletion(-) create mode 100644 tests/virstoragetestdata/images/qcow2_datafile-auto.qco= w2 create mode 100644 tests/virstoragetestdata/out/qcow2datafile-qcow2_qcow2-= datafile-auto diff --git a/tests/virstoragetest.c b/tests/virstoragetest.c index e568bd3141..1514991c20 100644 --- a/tests/virstoragetest.c +++ b/tests/virstoragetest.c @@ -488,13 +488,18 @@ mymain(void) /* qcow2 + datafile * 1) qcow2 image with data file - * 2) qcow2 -> qcow2 backing image with data file */ + * 2) qcow2 -> qcow2 backing image with data file + * 3) qcow2 (with no backing file format specified) -> qcow2 backing i= mage with data file + */ TEST_CHAIN("qcow2-datafile", abs_srcdir "/virstoragetestdata/images/datafile.qcow2", VIR_STORAGE_FILE_QCOW2, EXP_PASS); TEST_CHAIN("qcow2datafile-qcow2_qcow2-datafile", abs_srcdir "/virstoragetestdata/images/qcow2datafile-datafi= le.qcow2", VIR_STORAGE_FILE_QCOW2, EXP_PASS); + TEST_CHAIN("qcow2datafile-qcow2_qcow2-datafile-auto", + abs_srcdir "/virstoragetestdata/images/qcow2_datafile-auto.= qcow2", + VIR_STORAGE_FILE_QCOW2, EXP_PASS); /* broken qcow2 with a 'data_file' which is an empty string */ TEST_CHAIN("qcow2-datafile-broken", diff --git a/tests/virstoragetestdata/images/qcow2_datafile-auto.qcow2 b/te= sts/virstoragetestdata/images/qcow2_datafile-auto.qcow2 new file mode 100644 index 0000000000000000000000000000000000000000..e8a6c2710b5841236b8360d260b= 751f60349e2fa GIT binary patch literal 196616 zcmeIuyH3L}7zWTkX=3DlVE8Xjxj-7MrJUY!?HyqMkVsDf0*NE&ZVp;d;P|WLeSsIru z+P>d)>AySj>LXQsQ?83;naW~SudC4uCX05{_0@J;w@r}_-FP};I-K7ut7Y*#E2<{- zb+sM2Ad7YRc_{j7wP<%u8jBv~F|X66?5+mS@~kiS#h*7{mPQSqGyKiN`=3DZ^?Mxy`# z00000000000000000000000000000000000000000000000000000000000000000 z0000000000z%9sc;gJ9U000000000000000000000000000000000000000000000 z0000000000000000000000000000000F27c1poj50000000000000000000000000 u00000000000000000000000000000000000000000000000000BH|Zt@-@W( literal 0 HcmV?d00001 diff --git a/tests/virstoragetestdata/out/qcow2datafile-qcow2_qcow2-datafil= e-auto b/tests/virstoragetestdata/out/qcow2datafile-qcow2_qcow2-datafile-au= to new file mode 100644 index 0000000000..421e0c8d5a --- /dev/null +++ b/tests/virstoragetestdata/out/qcow2datafile-qcow2_qcow2-datafile-auto @@ -0,0 +1,31 @@ +path:ABS_SRCDIR/virstoragetestdata/images/qcow2_datafile-auto.qcow2 +backingStoreRaw: datafile.qcow2 +backingStoreRawFormat: (-1) +dataFileRaw: +capacity: 1024 +encryption: 0 +relPath: +type:file +format:qcow2 +protocol:none +hostname: + +path:ABS_SRCDIR/virstoragetestdata/images/datafile.qcow2 +backingStoreRaw: +backingStoreRawFormat: none(0) +dataFileRaw: raw +capacity: 1024 +encryption: 0 +relPath:datafile.qcow2 +type:file +format:qcow2 +protocol:none +hostname: + + dataFileStoreSource for 'ABS_SRCDIR/virstoragetestdata/images/datafile.qc= ow2': + path: ABS_SRCDIR/virstoragetestdata/images/raw + capacity: 0 + encryption: 0 + type:file + format:raw + --=20 2.55.0 From nobody Mon Aug 24 09:06:31 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.libvirt.org designates 38.145.34.151 as permitted sender) client-ip=38.145.34.151; 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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1785879293; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=T1pqnjEBxrKA2z7shKwyhFJhmoHlmjfUCVuj41m4w1c=; b=Pl6C6Wmalt8EGstwHU0jaHhjDCJaZ6xqDxuWA088SXRicAwFY81wd+FKL4iQWrr7tf7x9Z cbzavBinLvjW34iST9/m6s893UxsMN/sXONJXWyo12dBqjtbhk32D7c6YIAvST6ubftOT7 aA7NTzqJHEqGHXq0FozNFIBeIrqmjZQ= X-MC-Unique: gkKGVTQsM0m1dQBxlSEP0Q-1 X-Mimecast-MFC-AGG-ID: gkKGVTQsM0m1dQBxlSEP0Q_1785879290 To: devel@lists.libvirt.org Subject: [PATCH 2/2] virStorageSourceGetMetadataRecurse: Fix format probing exception for images with 'data_file' Date: Tue, 4 Aug 2026 23:34:45 +0200 Message-ID: <28ca1148ffbd0f9aa08f065b051fe40a2f6b21c8.1785879137.git.pkrempa@redhat.com> In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: PKApdsWXITKaK5vCrBfVbOQk0nvHveFaRHKeU2B8Wnk_1785879290 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Message-ID-Hash: AASCWWPGOXFZM473KSKMUQ27P6U5O6QL X-Message-ID-Hash: AASCWWPGOXFZM473KSKMUQ27P6U5O6QL X-MailFrom: pkrempa@redhat.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; header-match-devel.lists.libvirt.org-0; emergency; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.10 Precedence: list List-Id: Development discussions about the libvirt library & tools Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: Peter Krempa via Devel Reply-To: Peter Krempa X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1785879444995158500 Content-Type: text/plain; charset="utf-8" From: Peter Krempa The image metadata crawler code generally forbids qcow2 images which have a 'backing_file' but don't specify a 'backing_file_fmt' header as we don't want to probe the format due to security implications. There's one notable exception for the last image in the chain which can be format probed if it doesn't have another 'backing_file'. As the comment in 'virStorageSourceGetMetadataRecurse' suggests we don't want to allow the probe if anything probed would influence access to more resources. Unfortunately that didn't involve 'data_file' header which gives more access. Fortunately there is no way for a guest OS having a 'raw' disk and access to libvirt's snapshot API to abuse this as libvirt's snapshot API does specify the header. Other cases where an arbitrary image is passed to libvirt can 'backing_file'+'backing_file_fmt' directly to access arbitrary file on disk so this bug is no worse in this regard. Nevertheless it's a bug which should be fixed. Closes: https://gitlab.com/libvirt/libvirt/-/work_items/904 Fixes: 0a3d177d9bd6cc608cc8e5769188e5f45f70ee62 Signed-off-by: Peter Krempa Reviewed-by: J=C3=A1n Tomko --- src/storage_file/storage_source.c | 3 +- tests/virstoragetest.c | 2 +- .../qcow2datafile-qcow2_qcow2-datafile-auto | 31 ------------------- 3 files changed, 3 insertions(+), 33 deletions(-) delete mode 100644 tests/virstoragetestdata/out/qcow2datafile-qcow2_qcow2-= datafile-auto diff --git a/src/storage_file/storage_source.c b/src/storage_file/storage_s= ource.c index e886433bb4..aa7e834819 100644 --- a/src/storage_file/storage_source.c +++ b/src/storage_file/storage_source.c @@ -1426,9 +1426,10 @@ virStorageSourceGetMetadataRecurse(virStorageSource = *src, /* If we probed the format we MUST ensure that nothing else than the c= urrent * image is considered for security labelling and/or recursion. */ if (orig_format =3D=3D VIR_STORAGE_FILE_AUTO) { - if (src->backingStoreRaw) { + if (src->backingStoreRaw || src->dataFileRaw) { src->format =3D VIR_STORAGE_FILE_RAW; VIR_FREE(src->backingStoreRaw); + VIR_FREE(src->dataFileRaw); return -2; } } diff --git a/tests/virstoragetest.c b/tests/virstoragetest.c index 1514991c20..4c9272150c 100644 --- a/tests/virstoragetest.c +++ b/tests/virstoragetest.c @@ -499,7 +499,7 @@ mymain(void) VIR_STORAGE_FILE_QCOW2, EXP_PASS); TEST_CHAIN("qcow2datafile-qcow2_qcow2-datafile-auto", abs_srcdir "/virstoragetestdata/images/qcow2_datafile-auto.= qcow2", - VIR_STORAGE_FILE_QCOW2, EXP_PASS); + VIR_STORAGE_FILE_QCOW2, EXP_FAIL); /* broken qcow2 with a 'data_file' which is an empty string */ TEST_CHAIN("qcow2-datafile-broken", diff --git a/tests/virstoragetestdata/out/qcow2datafile-qcow2_qcow2-datafil= e-auto b/tests/virstoragetestdata/out/qcow2datafile-qcow2_qcow2-datafile-au= to deleted file mode 100644 index 421e0c8d5a..0000000000 --- a/tests/virstoragetestdata/out/qcow2datafile-qcow2_qcow2-datafile-auto +++ /dev/null @@ -1,31 +0,0 @@ -path:ABS_SRCDIR/virstoragetestdata/images/qcow2_datafile-auto.qcow2 -backingStoreRaw: datafile.qcow2 -backingStoreRawFormat: (-1) -dataFileRaw: -capacity: 1024 -encryption: 0 -relPath: -type:file -format:qcow2 -protocol:none -hostname: - -path:ABS_SRCDIR/virstoragetestdata/images/datafile.qcow2 -backingStoreRaw: -backingStoreRawFormat: none(0) -dataFileRaw: raw -capacity: 1024 -encryption: 0 -relPath:datafile.qcow2 -type:file -format:qcow2 -protocol:none -hostname: - - dataFileStoreSource for 'ABS_SRCDIR/virstoragetestdata/images/datafile.qc= ow2': - path: ABS_SRCDIR/virstoragetestdata/images/raw - capacity: 0 - encryption: 0 - type:file - format:raw - --=20 2.55.0