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Eric Blake d9f059aa6c qemu-img: Deprecate use of -b without -F 
Creating an image that requires format probing of the backing image is
potentially unsafe (we've had several CVEs over the years based on
probes leaking information to the guest on a subsequent boot, although
these days tools like libvirt are aware of the issue enough to prevent
the worst effects).  For example, if our probing algorithm ever
changes, or if other tools like libvirt determine a different probe
result than we do, then subsequent use of that backing file under a
different format will present corrupted data to the guest.
Fortunately, the worst effects occur only when the backing image is
originally raw, and we at least prevent commit into a probed raw
backing file that would change its probed type.

Still, it is worth starting a deprecation clock so that future
qemu-img can refuse to create backing chains that would rely on
probing, to encourage clients to avoid unsafe practices.  Most
warnings are intentionally emitted from bdrv_img_create() in the block
layer, but qemu-img convert uses bdrv_create() which cannot emit its
own warning without causing spurious warnings on other code paths.  In
the end, all command-line image creation or backing file rewriting now
performs a check.

Furthermore, if we probe a backing file as non-raw, then it is safe to
explicitly record that result (rather than relying on future probes);
only where we probe a raw image do we care about further warnings to
the user when using such an image (for example, commits into a
probed-raw backing file are prevented), to help them improve their
tooling.  But whether or not we make the probe results explicit, we
still warn the user to remind them to upgrade their workflow to supply
-F always.

iotest 114 specifically wants to create an unsafe image for later
amendment rather than defaulting to our new default of recording a
probed format, so it needs an update.  While touching it, expand it to
cover all of the various warnings enabled by this patch.  iotest 301
also shows a change to qcow messages.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200706203954.341758-11-eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
 		2020-07-14 15:24:05 +02:00
..
acceptance Testing and misc build updates: 2020-07-12 15:32:05 +01:00
data virtio,acpi: features, fixes, cleanups. 2020-07-07 17:37:44 +01:00
decode decodetree: Drop check for less than 2 patterns in a group 2020-06-09 09:19:48 -07:00
docker tests/docker: update toolchain set in debian-xtensa-cross 2020-07-11 15:53:09 +01:00
fp softfloat: Change tininess_before_rounding to bool 2020-05-19 08:41:16 -07:00
guest-debug tests/guest-debug: catch hanging guests 2020-05-15 15:25:07 +01:00
image-fuzzer image-fuzzer: Use OSerror.strerror instead of tuple subscript 2019-11-05 16:36:11 +01:00
keys
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migration tests/migration: fix unreachable path in stress test 2020-06-17 17:48:39 +01:00
multiboot tests/multiboot: Fix load address of test kernels 2019-07-30 12:25:43 +02:00
perf/block/qcow2 tests/perf: Test lseek influence on qcow2 block-status 2019-06-04 15:20:41 +02:00
plugin configure: Add -Wno-psabi 2020-06-18 10:26:02 +01:00
qapi-schema qapi: New special feature flag "deprecated" 2020-03-17 21:42:47 +01:00
qemu-iotests qemu-img: Deprecate use of -b without -F 2020-07-14 15:24:05 +02:00
qtest tests/qtest/fuzz: Add missing spaces in description 2020-07-13 11:40:52 +02:00
rocker
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tcg Testing and misc build updates: 2020-07-12 15:32:05 +01:00
tsan tests/docker: Added docker build support for TSan. 2020-06-16 14:49:05 +01:00
uefi-test-tools edk2 build scripts: work around TianoCore#1607 without forcing Python 2 2019-10-07 15:14:15 +02:00
vm tests/vm: allow us to take advantage of MTTCG 2020-07-11 15:53:00 +01:00
vmstate-static-checker-data
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.gitignore tests/tcg/aarch64: add a gdbstub testcase for SVE registers 2020-03-17 17:38:47 +00:00
Makefile.include Testing and misc build updates: 2020-07-12 15:32:05 +01:00
atomic64-bench.c tests: use g_usleep instead of rem = sleep(time) 2019-01-14 14:52:30 +00:00
atomic_add-bench.c tests: use g_usleep instead of rem = sleep(time) 2019-01-14 14:52:30 +00:00
benchmark-crypto-cipher.c tests: benchmark crypto with fixed data size, not time period 2019-10-28 13:32:21 +01:00
benchmark-crypto-hash.c crypto: extend hash benchmark to cover more algorithms 2020-05-07 12:52:51 +01:00
benchmark-crypto-hmac.c tests/crypto: Use the IEC binary prefix definitions 2018-07-02 15:41:17 +02:00
check-block-qdict.c tests: Use error_free_or_abort() where appropriate 2020-07-02 06:25:28 +02:00
check-block.sh check-block: enable iotests with SafeStack 2020-06-23 15:46:05 +01:00
check-qdict.c tests: Move qdict-test-data.txt to tests/data/qobject/ 2019-03-07 22:05:54 +01:00
check-qjson.c test: Use g_strndup instead of plain strndup 2019-08-21 10:27:13 +02:00
check-qlist.c qobject: Eliminate qlist_iter(), use QLIST_FOREACH_ENTRY() instead 2020-04-30 06:51:15 +02:00
check-qlit.c
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check-qnull.c
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check-qnum.c
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check-qobject.c tests: Use &error_abort where appropriate 2020-07-02 06:25:28 +02:00
check-qom-interface.c qom: make interface types abstract 2018-12-11 15:45:22 -02:00
check-qom-proplist.c tests: Use error_free_or_abort() where appropriate 2020-07-02 06:25:28 +02:00
check-qstring.c qstring: Move qstring_from_substr()'s @end one to the right 2018-07-28 09:09:58 +02:00
crypto-tls-psk-helpers.c crypto: Implement TLS Pre-Shared Keys (PSK). 2018-07-03 13:04:38 +01:00
crypto-tls-psk-helpers.h Supply missing header guards 2019-06-12 13:20:21 +02:00
crypto-tls-x509-helpers.c tests: call qcrypto_init instead of gnutls_global_init 2018-07-24 17:33:39 +01:00
crypto-tls-x509-helpers.h Supply missing header guards 2019-06-12 13:20:21 +02:00
dbus-vmstate-daemon.sh tests: add dbus-vmstate-test 2020-01-06 18:41:32 +04:00
io-channel-helpers.c
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io-channel-helpers.h Normalize position of header guard 2019-06-12 13:20:20 +02:00
iothread.c tests/iothread: Always connect iothread GSource to a GMainContext 2020-01-07 14:32:57 +00:00
iothread.h
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pkix_asn1_tab.c
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ptimer-test-stubs.c util/qemu-timer: refactor deadline calculation for external timers 2019-08-20 17:26:21 +02:00
ptimer-test.c tests/ptimer: Remove unnecessary inclusion of libqtest.h 2020-01-12 11:42:40 +01:00
ptimer-test.h
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qht-bench.c tests/qht-bench: Adjust threshold computation 2020-07-11 15:53:00 +01:00
rcutorture.c tests/rcutorture: mild documenting refactor of update thread 2020-02-25 17:42:59 +00:00
requirements.txt Acceptance test: add "boot_linux" tests 2020-03-17 18:55:52 -04:00
socket-helpers.c tests: specify the address family when checking bind 2019-08-22 17:30:25 +04:00
socket-helpers.h tests: specify the address family when checking bind 2019-08-22 17:30:25 +04:00
test-aio-multithread.c tests: Do not use "\n" in g_test_message() strings 2019-03-07 22:16:22 +01:00
test-aio.c util/async: make bh_aio_poll() O(1) 2020-02-22 08:26:47 +00:00
test-authz-list.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
test-authz-listfile.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
test-authz-pam.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
test-authz-simple.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
test-base64.c tests: Use error_free_or_abort() where appropriate 2020-07-02 06:25:28 +02:00
test-bdrv-drain.c block: Drop @child_class from bdrv_child_perm() 2020-05-18 19:05:25 +02:00
test-bdrv-graph-mod.c tests: Use error_free_or_abort() where appropriate 2020-07-02 06:25:28 +02:00
test-bitcnt.c
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test-bitmap.c tests: use g_test_rand_int 2019-12-17 09:05:23 +01:00
test-bitops.c
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test-block-backend.c Include qemu/main-loop.h less 2019-08-16 13:31:52 +02:00
test-block-iothread.c tests: Use error_free_or_abort() where appropriate 2020-07-02 06:25:28 +02:00
test-blockjob-txn.c job: drop job_drain 2019-09-10 08:58:43 +02:00
test-blockjob.c job: take each job's lock individually in job_txn_apply 2020-04-07 14:34:47 +02:00
test-bufferiszero.c
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test-char.c tests/test-char: Remove unused "chardev/char-mux.h" include 2020-07-13 11:59:47 +04:00
test-clone-visitor.c tests: Rename UserDefNativeListUnion to UserDefListUnion 2019-03-05 14:43:11 +01:00
test-coroutine.c tests: Do not use "\n" in g_test_message() strings 2019-03-07 22:16:22 +01:00
test-crypto-afsplit.c
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test-crypto-block.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
test-crypto-cipher.c tests: Use error_free_or_abort() where appropriate 2020-07-02 06:25:28 +02:00
test-crypto-hash.c
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test-crypto-hmac.c
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test-crypto-ivgen.c
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test-crypto-pbkdf.c test: execute g_test_run when tests are skipped 2019-01-11 13:57:25 +01:00
test-crypto-secret.c test-crypto-secret: add 'secret_keyring' object tests. 2020-06-15 11:33:51 +01:00
test-crypto-tlscredsx509.c glib: use portable g_setenv() 2019-12-17 09:05:23 +01:00
test-crypto-tlssession.c glib: use portable g_setenv() 2019-12-17 09:05:23 +01:00
test-crypto-xts.c crypto: add testing for unaligned buffers with XTS cipher mode 2018-10-24 19:03:37 +01:00
test-cutils.c cutils: Fix qemu_strtosz() & friends to reject non-finite sizes 2018-12-13 19:10:06 +01:00
test-hbitmap.c block/dirty-bitmap: improve _next_dirty_area API 2020-03-18 14:03:46 -04:00
test-image-locking.c Include qemu/main-loop.h less 2019-08-16 13:31:52 +02:00
test-int128.c
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test-io-channel-buffer.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
test-io-channel-command.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
test-io-channel-file.c Include qemu/module.h where needed, drop it from qemu-common.h 2019-06-12 13:18:33 +02:00
test-io-channel-socket.c socket: Add num connections to qio_channel_socket_async() 2019-09-03 23:24:42 +02:00
test-io-channel-tls.c glib: use portable g_setenv() 2019-12-17 09:05:23 +01:00
test-io-task.c tests: Use error_free_or_abort() where appropriate 2020-07-02 06:25:28 +02:00
test-iov.c
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test-keyval.c test-keyval: Tighten test of trailing crap after size 2019-12-18 12:28:44 +01:00
test-logging.c tests: Use &error_abort where appropriate 2020-07-02 06:25:28 +02:00
test-mul64.c
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test-opts-visitor.c
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test-qapi-util.c
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test-qdev-global-props.c qdev: Convert bus-less devices to qdev_realize() with Coccinelle 2020-06-15 22:06:04 +02:00
test-qdist.c
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test-qemu-opts.c tests: Use &error_abort where appropriate 2020-07-02 06:25:28 +02:00
test-qga.c tests: use g_test_rand_int 2019-12-17 09:05:23 +01:00
test-qgraph.c tests: test-qgraph: fix a memory leak 2019-03-11 16:33:49 +01:00
test-qht-par.c
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test-qht.c qht: drop ht argument from qht iterators 2018-09-26 08:55:54 -07:00
test-qmp-cmds.c qapi: Add feature flags to remaining definitions 2020-03-17 19:58:34 +01:00
test-qmp-event.c tests/test-qmp-event: Check event is actually emitted 2020-03-17 19:58:34 +01:00
test-qobject-input-visitor.c tests: Rename UserDefNativeListUnion to UserDefListUnion 2019-03-05 14:43:11 +01:00
test-qobject-output-visitor.c qapi: Assert output visitors see only valid enum values 2020-04-30 07:26:09 +02:00
test-rcu-list.c tests: Fix a bug with count variables 2020-03-06 10:35:15 +00:00
test-rcu-simpleq.c tests: add test-list-simpleq 2018-08-23 18:46:25 +02:00
test-rcu-slist.c rcu_queue: add QSLIST functions 2020-02-22 08:26:47 +00:00
test-rcu-tailq.c tests: add test-rcu-tailq 2018-08-23 18:46:25 +02:00
test-replication.c tests: Use &error_abort where appropriate 2020-07-02 06:25:28 +02:00
test-shift128.c
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test-string-input-visitor.c tests: Use &error_abort where appropriate 2020-07-02 06:25:28 +02:00
test-string-output-visitor.c tests: Use &error_abort where appropriate 2020-07-02 06:25:28 +02:00
test-thread-pool.c test-thread-pool: be more reliable 2019-06-03 14:03:00 +02:00
test-throttle.c test-throttle: Fix uninitialized use of burst_length 2019-08-20 17:26:19 +02:00
test-timed-average.c
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test-util-filemonitor.c test-util-filemonitor: Plug unlikely memory leak 2020-07-02 06:25:29 +02:00
test-util-sockets.c tests/util-sockets: add abstract unix socket cases 2020-05-20 10:34:45 +01:00
test-uuid.c
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test-visitor-serialization.c
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test-vmstate.c test-vmstate: Fix memleaks in test_load_qlist 2020-02-28 09:25:49 +01:00
test-write-threshold.c
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test-x86-cpuid.c hw/i386: Update structures to save the number of nodes per package 2020-03-17 19:48:10 -04:00
test-xbzrle.c
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vhost-user-bridge.c core: replace getpagesize() with qemu_real_host_page_size 2019-10-26 15:38:06 +02:00