MSVSphere Packaging Team
8 months ago
parent
d4a1d5069d
commit
efa7804d51
@ -1,2 +1,2 @@
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SOURCES/libguestfs.keyring
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SOURCES/libguestfs.keyring
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SOURCES/libnbd-1.16.0.tar.gz
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SOURCES/libnbd-1.18.1.tar.gz
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@ -1,2 +1,2 @@
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cc1b37b9cfafa515aab3eefd345ecc59aac2ce7b SOURCES/libguestfs.keyring
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cc1b37b9cfafa515aab3eefd345ecc59aac2ce7b SOURCES/libguestfs.keyring
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c2414379523599f06d4fb1f16fb9ed988e7fbb35 SOURCES/libnbd-1.16.0.tar.gz
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4f99e6f21edffe62b394aa9c7fb68149e6d4d5e4 SOURCES/libnbd-1.18.1.tar.gz
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@ -0,0 +1,88 @@
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From 4451e5b61ca07771ceef3e012223779e7a0c7701 Mon Sep 17 00:00:00 2001
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From: Eric Blake <eblake@redhat.com>
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Date: Mon, 30 Oct 2023 12:50:53 -0500
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Subject: [PATCH] generator: Fix assertion in ext-mode BLOCK_STATUS,
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|
CVE-2023-5871
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|
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Another round of fuzz testing revealed that when a server negotiates
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extended headers and replies with a 64-bit flag value where the client
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used the 32-bit API command, we were correctly flagging the server's
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|
response as being an EOVERFLOW condition, but then immediately failing
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in an assertion failure instead of reporting it to the application.
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The following one-byte change to qemu.git at commit fd9a38fd43 allows
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the creation of an intentionally malicious server:
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|
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| diff --git i/nbd/server.c w/nbd/server.c
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|
| index 859c163d19f..32e1e771a95 100644
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|
| --- i/nbd/server.c
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|
| +++ w/nbd/server.c
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|
| @@ -2178,7 +2178,7 @@ static void nbd_extent_array_convert_to_be(NBDExtentArray *ea)
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|
|
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|
| for (i = 0; i < ea->count; i++) {
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|
| ea->extents[i].length = cpu_to_be64(ea->extents[i].length);
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|
| - ea->extents[i].flags = cpu_to_be64(ea->extents[i].flags);
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|
| + ea->extents[i].flags = ~cpu_to_be64(ea->extents[i].flags);
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| }
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|
| }
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|
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|
and can then be detected with the following command line:
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|
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|
$ nbdsh -c - <<\EOF
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> def f(a,b,c,d):
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|
> pass
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>
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> h.connect_systemd_socket_activation(["/path/to/bad/qemu-nbd",
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|
> "-r", "-f", "raw", "TODO"])
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> h.block_staus(h.get_size(), 0, f)
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|
> EOF
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nbdsh: generator/states-reply-chunk.c:626: enter_STATE_REPLY_CHUNK_REPLY_RECV_BS_ENTRIES: Assertion `(len | flags) <= UINT32_MAX' failed.
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|
Aborted (core dumped)
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|
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|
whereas a fixed libnbd will give:
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nbdsh: command line script failed: nbd_block_status: block-status: command failed: Value too large for defined data type
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|
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|
We can either relax the assertion (by changing to 'assert ((len |
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|
flags) <= UINT32_MAX || cmd->error)'), or intentionally truncate flags
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|
to make the existing assertion reliable. This patch goes with the
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|
latter approach.
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|
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|
Sadly, this crash is possible in all existing 1.18.x stable releases,
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|
if they were built with assertions enabled (most distros do this by
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|
default), meaning a malicious server has an easy way to cause a Denial
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|
of Service attack by triggering the assertion failure in vulnerable
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|
clients, so we have assigned this CVE-2023-5871. Mitigating factors:
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|
the crash only happens for a server that sends a 64-bit status block
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|
reply (no known production servers do so; qemu 8.2 will be the first
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|
known server to support extended headers, but it is not yet released);
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|
and as usual, a client can use TLS to guarantee it is connecting only
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|
to a known-safe server. If libnbd is compiled without assertions,
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|
there is no crash or other mistaken behavior; and when assertions are
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|
enabled, the attacker cannot accomplish anything more than a denial of
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|
service.
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|
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|
Reported-by: Richard W.M. Jones <rjones@redhat.com>
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|
Fixes: 20dadb0e10 ("generator: Prepare for extent64 callback", v1.17.4)
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|
Signed-off-by: Eric Blake <eblake@redhat.com>
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|
(cherry picked from commit 177308adb17e81fce7c0f2b2fcf655c5c0b6a4d6)
|
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|
Signed-off-by: Eric Blake <eblake@redhat.com>
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|
---
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|
generator/states-reply-chunk.c | 1 +
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|
1 file changed, 1 insertion(+)
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|
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|
diff --git a/generator/states-reply-chunk.c b/generator/states-reply-chunk.c
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|
index 5a31c19..8ab7e8b 100644
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|
--- a/generator/states-reply-chunk.c
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|
+++ b/generator/states-reply-chunk.c
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|
@@ -600,6 +600,7 @@ STATE_MACHINE {
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|
break; /* Skip this and later extents; we already made progress */
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|
/* Expose this extent as an error; we made no progress */
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|
cmd->error = cmd->error ? : EOVERFLOW;
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|
+ flags = (uint32_t)flags;
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|
}
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|
}
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--
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|
2.39.3
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|
|
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@ -0,0 +1,34 @@
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|
From c39e31b7a20c7dc8aa12c5fa3f1742824e1e0c76 Mon Sep 17 00:00:00 2001
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|
From: "Richard W.M. Jones" <rjones@redhat.com>
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|
Date: Thu, 9 Nov 2023 09:40:30 +0000
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Subject: [libnbd PATCH] docs: Fix incorrect xref in libnbd-release-notes for
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|
1.18
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Content-type: text/plain
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|
LIBNBD_STRICT_AUTO_FLAG was added to nbd_set_strict_mode(3).
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|
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|
Reported-by: Vera Wu
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|
(cherry picked from commit 4fef3dbc07e631fce58487d25d991e83bbb424b1)
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||||||
|
Signed-off-by: Eric Blake <eblake@redhat.com>
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|
---
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|
docs/libnbd-release-notes-1.18.pod | 4 ++--
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|
1 file changed, 2 insertions(+), 2 deletions(-)
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|
diff --git a/docs/libnbd-release-notes-1.18.pod b/docs/libnbd-release-notes-1.18.pod
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|
index 935fab11..836ebe19 100644
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|
--- a/docs/libnbd-release-notes-1.18.pod
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|
+++ b/docs/libnbd-release-notes-1.18.pod
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@@ -84,8 +84,8 @@ Golang, OCaml and Python language bindings (Eric Blake).
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|
L<nbd_shutdown(3)> now works correctly when in opt mode (Eric Blake).
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|
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|
-L<nbd_set_string(3)> adds C<LIBNBD_STRICT_AUTO_FLAG> which allows the
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|
-client to test how servers behave when the payload length flag is
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|
+L<nbd_set_strict_mode(3)> adds C<LIBNBD_STRICT_AUTO_FLAG> which allows
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|
+the client to test how servers behave when the payload length flag is
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|
adjusted (Eric Blake).
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|
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|
=head2 Protocol
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|
--
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|
2.41.0
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@ -0,0 +1,206 @@
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|
From 32cb9ab9f1701b1a1a826b48f2083cb75adf1e87 Mon Sep 17 00:00:00 2001
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|
From: Eric Blake <eblake@redhat.com>
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Date: Thu, 9 Nov 2023 20:11:08 -0600
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Subject: [libnbd PATCH] tests: Check behavior of
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nbd_set_strict_mode(STRICT_AUTO_FLAG)
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Content-type: text/plain
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|
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|
While developing extended header support for qemu 8.2, I needed a way
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to make libnbd quickly behave as a non-compliant client to test corner
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cases in qemu's server code; so I wrote commit 5c1dae9236 ("api: Add
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|
LIBNBD_STRICT_AUTO_FLAG to nbd_set_strict", v1.18.0) to meet my needs.
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|
However, I failed to codify my manual tests of that bit into a unit
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|
test for libnbd, until now. Most sane clients will never call
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nbd_set_strict_mode() in the first place (after all, it is explicitly
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documented as an integration tool, which is how I used it with my qemu
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|
code development), but it never hurts to make sure we don't break it
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even for the relatively small set of users that would ever use it.
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The test added here runs in two parts; if you get a SKIP despite
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having qemu-nbd, then the first part ran successfully before the
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second half gave up due to lack of extended headers in qemu
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(presumably qemu 8.1 or older); if you get a PASS, then both parts
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|
were run. However, both parts are inherently fragile, depending on
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behavior known to be in qemu 8.2 - while it is unlikely to change in
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|
future qemu releases (at least as long as I continue to maintain NBD
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|
code there), the fact that we are intentionally violating the NBD
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|
protocol means a different server is within its rights to behave
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|
differently than qemu 8.2 did. Hence this test lives in interop/
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|
rather than tests/ because of its strong ties to a particular qemu.
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|
|
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|
Signed-off-by: Eric Blake <eblake@redhat.com>
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|
(cherry picked from commit 54d4426394c372413f55f648d4ad1d21b3395e07)
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||||||
|
Signed-off-by: Eric Blake <eblake@redhat.com>
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|
---
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|
interop/Makefile.am | 2 +
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|
interop/strict-mode-auto-flag.sh | 138 +++++++++++++++++++++++++++++++
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|
2 files changed, 140 insertions(+)
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|
create mode 100755 interop/strict-mode-auto-flag.sh
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|
diff --git a/interop/Makefile.am b/interop/Makefile.am
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|
index d6485adf..ac12d84a 100644
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|
--- a/interop/Makefile.am
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|
+++ b/interop/Makefile.am
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|
@@ -28,6 +28,7 @@ EXTRA_DIST = \
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|
structured-read.sh \
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|
opt-extended-headers.sh \
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|
block-status-payload.sh \
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||||||
|
+ strict-mode-auto-flag.sh \
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|
$(NULL)
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|
|
||||||
|
TESTS_ENVIRONMENT = \
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|
@@ -153,6 +154,7 @@ TESTS += \
|
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|
interop-qemu-block-size.sh \
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|
opt-extended-headers.sh \
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||||||
|
block-status-payload.sh \
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|
+ strict-mode-auto-flag.sh \
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|
$(NULL)
|
||||||
|
|
||||||
|
interop_qemu_nbd_SOURCES = \
|
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|
diff --git a/interop/strict-mode-auto-flag.sh b/interop/strict-mode-auto-flag.sh
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||||||
|
new file mode 100755
|
||||||
|
index 00000000..8f73ea73
|
||||||
|
--- /dev/null
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||||||
|
+++ b/interop/strict-mode-auto-flag.sh
|
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|
@@ -0,0 +1,138 @@
|
||||||
|
+#!/usr/bin/env bash
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|
+# nbd client library in userspace
|
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|
+# Copyright Red Hat
|
||||||
|
+#
|
||||||
|
+# This library is free software; you can redistribute it and/or
|
||||||
|
+# modify it under the terms of the GNU Lesser General Public
|
||||||
|
+# License as published by the Free Software Foundation; either
|
||||||
|
+# version 2 of the License, or (at your option) any later version.
|
||||||
|
+#
|
||||||
|
+# This library is distributed in the hope that it will be useful,
|
||||||
|
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||||
|
+# Lesser General Public License for more details.
|
||||||
|
+#
|
||||||
|
+# You should have received a copy of the GNU Lesser General Public
|
||||||
|
+# License along with this library; if not, write to the Free Software
|
||||||
|
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||||||
|
+
|
||||||
|
+# Test effect of AUTO_FLAG bit in set_strict_mode()
|
||||||
|
+
|
||||||
|
+source ../tests/functions.sh
|
||||||
|
+set -e
|
||||||
|
+set -x
|
||||||
|
+
|
||||||
|
+requires truncate --version
|
||||||
|
+requires qemu-nbd --version
|
||||||
|
+requires nbdsh --version
|
||||||
|
+
|
||||||
|
+file="strict-mode-auto-flag.file"
|
||||||
|
+rm -f $file
|
||||||
|
+cleanup_fn rm -f $file
|
||||||
|
+
|
||||||
|
+truncate -s 1M $file
|
||||||
|
+
|
||||||
|
+# Unconditional part of test: behavior when extended headers are not in use
|
||||||
|
+$VG nbdsh -c '
|
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|
+import errno
|
||||||
|
+
|
||||||
|
+h.set_request_extended_headers(False)
|
||||||
|
+args = ["qemu-nbd", "-f", "raw", "'"$file"'"]
|
||||||
|
+h.connect_systemd_socket_activation(args)
|
||||||
|
+assert h.get_extended_headers_negotiated() is False
|
||||||
|
+
|
||||||
|
+# STRICT_AUTO_FLAG and STRICT_COMMANDS are on by default
|
||||||
|
+flags = h.get_strict_mode()
|
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|
+assert flags & nbd.STRICT_AUTO_FLAG
|
||||||
|
+assert flags & nbd.STRICT_COMMANDS
|
||||||
|
+
|
||||||
|
+# Under STRICT_AUTO_FLAG, using or omitting flag does not matter; client
|
||||||
|
+# side auto-corrects the flag before passing to server
|
||||||
|
+h.pwrite(b"1"*512, 0, 0)
|
||||||
|
+h.pwrite(b"2"*512, 0, nbd.CMD_FLAG_PAYLOAD_LEN)
|
||||||
|
+
|
||||||
|
+# Without STRICT_AUTO_FLAG but still STRICT_COMMANDS, client side now sees
|
||||||
|
+# attempts to use the flag as invalid
|
||||||
|
+flags = flags & ~nbd.STRICT_AUTO_FLAG
|
||||||
|
+h.set_strict_mode(flags)
|
||||||
|
+h.pwrite(b"3"*512, 0, 0)
|
||||||
|
+stats = h.stats_bytes_sent()
|
||||||
|
+try:
|
||||||
|
+ h.pwrite(b"4"*512, 0, nbd.CMD_FLAG_PAYLOAD_LEN)
|
||||||
|
+ assert False
|
||||||
|
+except nbd.Error as e:
|
||||||
|
+ assert e.errnum == errno.EINVAL
|
||||||
|
+assert stats == h.stats_bytes_sent()
|
||||||
|
+
|
||||||
|
+# Warning: fragile test ahead. Without STRICT_COMMANDS, we send unexpected
|
||||||
|
+# flag to qemu, and expect failure. For qemu <= 8.1, this is safe (those
|
||||||
|
+# versions did not know the flag, and correctly reject unknown flags with
|
||||||
|
+# NBD_EINVAL). For qemu 8.2, this also works (qemu knows the flag, but warns
|
||||||
|
+# that we were not supposed to send it without extended headers). But if
|
||||||
|
+# future qemu versions change to start silently ignoring the flag (after all,
|
||||||
|
+# a write command obviously has a payload even without extended headers, so
|
||||||
|
+# the flag is redundant for NBD_CMD_WRITE), then we may need to tweak this.
|
||||||
|
+flags = flags & ~nbd.STRICT_COMMANDS
|
||||||
|
+h.set_strict_mode(flags)
|
||||||
|
+h.pwrite(b"5"*512, 0, 0)
|
||||||
|
+stats = h.stats_bytes_sent()
|
||||||
|
+try:
|
||||||
|
+ h.pwrite(b"6"*512, 0, nbd.CMD_FLAG_PAYLOAD_LEN)
|
||||||
|
+ print("Did newer qemu change behavior?")
|
||||||
|
+ assert False
|
||||||
|
+except nbd.Error as e:
|
||||||
|
+ assert e.errnum == errno.EINVAL
|
||||||
|
+assert stats < h.stats_bytes_sent()
|
||||||
|
+
|
||||||
|
+h.shutdown()
|
||||||
|
+'
|
||||||
|
+
|
||||||
|
+# Conditional part of test: only run if qemu supports extended headers
|
||||||
|
+requires nbdinfo --has extended-headers -- [ qemu-nbd -r -f raw "$file" ]
|
||||||
|
+$VG nbdsh -c '
|
||||||
|
+import errno
|
||||||
|
+
|
||||||
|
+args = ["qemu-nbd", "-f", "raw", "'"$file"'"]
|
||||||
|
+h.connect_systemd_socket_activation(args)
|
||||||
|
+assert h.get_extended_headers_negotiated() is True
|
||||||
|
+
|
||||||
|
+# STRICT_AUTO_FLAG and STRICT_COMMANDS are on by default
|
||||||
|
+flags = h.get_strict_mode()
|
||||||
|
+assert flags & nbd.STRICT_AUTO_FLAG
|
||||||
|
+assert flags & nbd.STRICT_COMMANDS
|
||||||
|
+
|
||||||
|
+# Under STRICT_AUTO_FLAG, using or omitting flag does not matter; client
|
||||||
|
+# side auto-corrects the flag before passing to server
|
||||||
|
+h.pwrite(b"1"*512, 0, 0)
|
||||||
|
+h.pwrite(b"2"*512, 0, nbd.CMD_FLAG_PAYLOAD_LEN)
|
||||||
|
+
|
||||||
|
+# Without STRICT_AUTO_FLAG but still STRICT_COMMANDS, client side now sees
|
||||||
|
+# attempts to omit the flag as invalid
|
||||||
|
+flags = flags & ~nbd.STRICT_AUTO_FLAG
|
||||||
|
+h.set_strict_mode(flags)
|
||||||
|
+h.pwrite(b"3"*512, 0, nbd.CMD_FLAG_PAYLOAD_LEN)
|
||||||
|
+stats = h.stats_bytes_sent()
|
||||||
|
+try:
|
||||||
|
+ h.pwrite(b"4"*512, 0, 0)
|
||||||
|
+ assert False
|
||||||
|
+except nbd.Error as e:
|
||||||
|
+ assert e.errnum == errno.EINVAL
|
||||||
|
+assert stats == h.stats_bytes_sent()
|
||||||
|
+
|
||||||
|
+# Warning: fragile test ahead. Without STRICT_COMMANDS, omitting the flag
|
||||||
|
+# is a protocol violation. qemu 8.2 silently ignores the violation; but a
|
||||||
|
+# future qemu might start failing the command, at which point we would need
|
||||||
|
+# to tweak this part of the test.
|
||||||
|
+flags = flags & ~nbd.STRICT_COMMANDS
|
||||||
|
+h.set_strict_mode(flags)
|
||||||
|
+h.pwrite(b"5"*512, 0, nbd.CMD_FLAG_PAYLOAD_LEN)
|
||||||
|
+stats = h.stats_bytes_sent()
|
||||||
|
+try:
|
||||||
|
+ h.pwrite(b"6"*512, 0, 0)
|
||||||
|
+except nbd.Error:
|
||||||
|
+ print("Did newer qemu change behavior?")
|
||||||
|
+ assert False
|
||||||
|
+assert stats < h.stats_bytes_sent()
|
||||||
|
+
|
||||||
|
+h.shutdown()
|
||||||
|
+'
|
||||||
|
--
|
||||||
|
2.41.0
|
||||||
|
|
||||||
@ -1,17 +0,0 @@
|
|||||||
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||||||
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|
||||||
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|
||||||
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||||||
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|
||||||
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|||||||
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||||||
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||||||
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|
||||||
|
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|
||||||
|
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|
||||||
|
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|
||||||
|
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|
||||||
|
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|
||||||
|
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|
||||||
|
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|
||||||
|
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|
||||||
|
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|
||||||
|
irUsxdBhGIM=
|
||||||
|
=pgmp
|
||||||
|
-----END PGP SIGNATURE-----
|
||||||
Loading…
Reference in new issue