Commit Graph

832 Commits (master)

Author SHA1 Message Date
Thomas Huth 0d8caac904 Bump minimum glib version to v2.66
Now that we dropped support for CentOS 8 and Ubuntu 20.04, we can
look into bumping the glib version to a new minimum for further
clean-ups. According to repology.org, available versions are:

 CentOS Stream 9:       2.66.7
 Debian 11:             2.66.8
 Fedora 38:             2.74.1
 Freebsd:               2.78.4
 Homebrew:              2.80.0
 Openbsd:               2.78.4
 OpenSuse leap 15.5:    2.70.5
 pkgsrc_current:        2.78.4
 Ubuntu 22.04:          2.72.1

Thus it should be safe to bump the minimum glib version to 2.66 now.
Version 2.66 comes with new functions for URI parsing which will
allow further clean-ups in the following patches.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-ID: <20240418101056.302103-8-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
2024-05-14 12:46:24 +02:00
Paolo Bonzini 9b089d254a configs: disable emulators that require it if libfdt is not found
Since boards can express their dependency on libfdt and
system/device_tree.c, only leave TARGET_NEED_FDT if the target has a
hard dependency.

Those emulators will be skipped if libfdt is disabled, or if it
is "auto" and not found and --disable-download is passed; unless
the target is mentioned explicitly in --target-list, in which case
the build will fail.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2024-05-10 15:45:15 +02:00
Paolo Bonzini 1935b7ead1 kconfig: allow compiling out QEMU device tree code per target
Introduce a new Kconfig symbol, CONFIG_DEVICE_TREE, that specifies whether
to include the common device tree code in system/device_tree.c and to
link to libfdt.  For now, include it unconditionally if libfdt is
available.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2024-05-10 15:45:15 +02:00
Paolo Bonzini 7a6f3343b6 meson: move libfdt together with other dependencies
Move the libfdt detection code together with other dependencies instead
of keeping it with subprojects.  This has the disadvantage of performing
the detection even if no target requires libfdt; but it has the advantage
that Kconfig will be able to observe the availability of the library.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2024-05-10 15:45:15 +02:00
Paolo Bonzini 727bb5b477 meson: pick libfdt from common_ss when building target-specific files
Avoid having to list dependencies such as libfdt twice, both on common_ss
and specific_ss.  Instead, just take all the dependencies in common_ss
and allow the target-specific libqemu-*.fa library to use them.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2024-05-10 15:45:15 +02:00
Fabiano Rosas eef0bae3a7 migration: Remove block migration
The block migration has been considered obsolete since QEMU 8.2 in
favor of the more flexible storage migration provided by the
blockdev-mirror driver. Two releases have passed so now it's time to
remove it.

Deprecation commit 66db46ca83 ("migration: Deprecate block
migration").

Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
2024-05-08 09:20:58 -03:00
Paolo Bonzini bae3e3a5c6 meson: make target endianneess available to Kconfig
Some targets use "default y" for boards to filter out those that require
TCG.  For consistency we are switching all other targets to do the same.
MIPS boards may only be available for big-endian or only for
little-endian emulators, add a symbol so that this can be described
with a "depends on" clause.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2024-05-03 15:47:47 +02:00
Philippe Mathieu-Daudé 75bbe6a4d2 exec: Expose 'target_page.h' API to user emulation
User-only objects might benefit from the "exec/target_page.h"
API, which allows to build some objects once for all targets.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20231211212003.21686-3-philmd@linaro.org>
2024-04-26 15:28:11 +02:00
Philippe Mathieu-Daudé 7d7a21ba69 exec: Rename NEED_CPU_H -> COMPILING_PER_TARGET
'NEED_CPU_H' guard target-specific code; it is defined by meson
altogether with the 'CONFIG_TARGET' definition. Rename NEED_CPU_H
as COMPILING_PER_TARGET to clarify its meaning.

Mechanical change running:

 $ sed -i s/NEED_CPU_H/COMPILING_PER_TARGET/g $(git grep -l NEED_CPU_H)

then manually add a /* COMPILING_PER_TARGET */ comment
after the '#endif' when the block is large.

Inspired-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240322161439.6448-4-philmd@linaro.org>
2024-04-26 09:49:51 +02:00
Ilya Leoshkevich 1f2355f53c meson: Make DEBUG_REMAP a meson option
Currently DEBUG_REMAP is a macro that needs to be manually #defined to
be activated, which makes it hard to have separate build directories
dedicated to testing the code with it. Promote it to a meson option.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20240312002402.14344-1-iii@linux.ibm.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2024-04-24 15:46:00 -07:00
Richard Henderson 85b597413d Removal of deprecated code
- Remove the Nios II target and hardware
 - Remove pvrdma device and rdmacm-mux helper
 - Remove GlusterFS RDMA protocol handling
 - Update Sriram Yagnaraman mail address
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Merge tag 'housekeeping-20240424' of https://github.com/philmd/qemu into staging

Removal of deprecated code

- Remove the Nios II target and hardware
- Remove pvrdma device and rdmacm-mux helper
- Remove GlusterFS RDMA protocol handling
- Update Sriram Yagnaraman mail address

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* tag 'housekeeping-20240424' of https://github.com/philmd/qemu:
  block/gluster: Remove deprecated RDMA protocol handling
  hw/rdma: Remove deprecated pvrdma device and rdmacm-mux helper
  hw/timer: Remove the ALTERA_TIMER model
  target/nios2: Remove the deprecated Nios II target
  MAINTAINERS: Update Sriram Yagnaraman mail address

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2024-04-24 11:49:57 -07:00
Philippe Mathieu-Daudé 1dfd42c426 hw/rdma: Remove deprecated pvrdma device and rdmacm-mux helper
The whole RDMA subsystem was deprecated in commit e9a54265f5
("hw/rdma: Deprecate the pvrdma device and the rdma subsystem")
released in v8.2.

Remove:
 - PVRDMA device
 - generated vmw_pvrdma/ directory from linux-headers
 - rdmacm-mux tool from contrib/

Cc: Yuval Shaia <yuval.shaia.ml@gmail.com>
Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20240328130255.52257-2-philmd@linaro.org>
2024-04-24 16:03:38 +02:00
Philippe Mathieu-Daudé 6c3014858c target/nios2: Remove the deprecated Nios II target
The Nios II target is deprecated since v8.2 in commit 9997771bc1
("target/nios2: Deprecate the Nios II architecture").

Remove:
- Buildsys / CI infra
- User emulation
- System emulation (10m50-ghrd & nios2-generic-nommu machines)
- Tests

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Acked-by: Marek Vasut <marex@denx.de>
Message-Id: <20240327144806.11319-3-philmd@linaro.org>
2024-04-24 16:03:38 +02:00
Philippe Mathieu-Daudé 68621262bd hw: Include minimal source set in user emulation build
Only the files in hwcore_ss[] are required to link a user emulation
binary.

Have meson process the hw/ sub-directories if system emulation is
selected, otherwise directly process hw/core/ to get hwcore_ss[], which
is the only set required by user emulation.

This removes about 10% from the time needed to run
"../configure --disable-system --disable-tools --disable-guest-agent".

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20240404194757.9343-8-philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20240408155330.522792-9-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2024-04-18 11:17:27 +02:00
Paolo Bonzini 6190fd61d4 meson: do not link pixman automatically into all targets
The dependency on pixman is listed manually in all sourcesets that need it.
There is no need to bring into libqemuutil, since there is nothing in
util/ that needs pixman either.

Reported-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20240408155330.522792-2-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2024-04-18 11:17:27 +02:00
Thomas Huth 2d6d995709 meson.build: Disable -fzero-call-used-regs on OpenBSD
QEMU currently does not work on OpenBSD since the -fzero-call-used-regs
option that we added to meson.build recently does not work with the
"retguard" extension from OpenBSD's Clang. Thus let's disable the
-fzero-call-used-regs here until there's a better solution available.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2278
Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240411120819.56417-1-thuth@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2024-04-12 12:02:12 +02:00
Paolo Bonzini 05007258f0 meson: remove dead dictionary access
The "link_depends" key has not been used since commit c46f76d158
("meson: specify fuzz linker script as a project arg", 2020-09-08),
and even before that it was only used for fork-fuzzing which we
removed in commit d2e6f9272d ("fuzz: remove fork-fuzzing scaffolding",
2023-02-16).

So, remove it for a very small simplification of meson.build.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2024-03-20 11:30:49 +01:00
Peter Maydell bab9dabe7d Pull request
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Merge tag 'tracing-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

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# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [full]
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* tag 'tracing-pull-request' of https://gitlab.com/stefanha/qemu:
  meson: generate .stp files for tools too
  tracetool: remove redundant --target-type / --target-name args

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2024-03-13 12:37:15 +00:00
Daniel P. Berrangé 2b608e16ca meson: generate .stp files for tools too
The qemu-img, qemu-io, qemu-nbd, qemu-storage-daemon tools all have
support for systemtap tracing built-in, so should be given corresponding
.stp files to define their probes.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20240108171356.1037059-3-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2024-03-12 14:52:07 -04:00
Daniel P. Berrangé 081340d1dd tracetool: remove redundant --target-type / --target-name args
The --target-type and --target-name args are used to construct
the default probe prefix if '--probe-prefix' is not given. The
meson.build will always pass '--probe-prefix', so the other args
are effectively redundant.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20240108171356.1037059-2-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2024-03-12 14:52:07 -04:00
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Merge tag 'net-pull-request' of https://github.com/jasowang/qemu into staging

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# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 215D 46F4 8246 689E C77F  3562 EF04 965B 398D 6211

* tag 'net-pull-request' of https://github.com/jasowang/qemu:
  ebpf: Updated eBPF program and skeleton.
  qmp: Added new command to retrieve eBPF blob.
  virtio-net: Added property to load eBPF RSS with fds.
  ebpf: Added eBPF initialization by fds.
  ebpf: Added eBPF map update through mmap.
  Avoid unaligned fetch in ladr_match()
  e1000e: fix link state on resume
  igb: fix link state on resume

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2024-03-12 13:42:57 +00:00
Andrew Melnychenko 0cc14182ab ebpf: Updated eBPF program and skeleton.
Updated section name, so libbpf should init/gues proper
program type without specifications during open/load.
Also, added map_flags with explicitly declared BPF_F_MMAPABLE.
Added check for BPF_F_MMAPABLE flag to meson script and
requirements to libbpf version.
Also changed fragmentation flag check - some TCP/UDP packets
may be considered fragmented if DF flag is set.

Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
2024-03-12 19:31:47 +08:00
Peter Maydell 2ef938a099 meson.build: Always require an objc compiler on macos hosts
We currently only insist that an ObjectiveC compiler is present on
macos hosts if we're building the Cocoa UI.  However, since then
we've added some other parts of QEMU which are also written in ObjC:
the coreaudio audio backend, and the vmnet net backend.  This means
that if you try to configure QEMU on macos with --disable-cocoa the
build will fail:

../meson.build:3741:13: ERROR: No host machine compiler for 'audio/coreaudio.m'

Since in practice any macos host will have an ObjC compiler
available, rather than trying to gate the compiler detection on an
increasingly complicated list of every bit of QEMU that uses ObjC,
just require it unconditionally on macos hosts.

Resolves https://gitlab.com/qemu-project/qemu/-/issues/2138

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-ID: <20240311133334.3991537-1-peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
2024-03-11 22:10:18 +01:00
Akihiko Odaki 5d402bd9ae meson: Remove --warn-common ldflag
--warn-common ldflag causes warnings for multiple definitions of
___asan_globals_registered when enabling AddressSanitizer with clang.
The warning is somewhat obsolete so just remove it.

The common block is used to allow duplicate definitions of uninitialized
global variables. In the past, GCC and clang used to place such
variables in a common block by default, which prevented programmers for
noticing accidental duplicate definitions. Commit 49237acdb7 ("Enable
ld flag --warn-common") added --warn-common ldflag so that ld warns in
such a case.

Today, both of GCC and clang don't use common blocks by default[1][2] so
any remaining use of common blocks should be intentional. Remove
--warn-common ldflag to suppress warnings for intentional use of
common blocks.

[1]: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85678
[2]: https://reviews.llvm.org/D75056

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-ID: <20240304-common-v1-1-1a2005d1f350@daynix.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2024-03-08 15:51:21 +01:00
Daniel P. Berrangé 956331108e meson: detect broken clang 17 with -fzero-call-used-regs
Clang 17 will segv if given  -fzero-call-used-regs and optimization
is enabled. Since upstream hasn't triaged the bug, distros are
increasingly shipping with broken Clang.

https://github.com/llvm/llvm-project/issues/75168
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277474
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20240304144456.3825935-2-berrange@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2024-03-04 15:57:35 +00:00
Peter Maydell 64c1a54435 meson: Enable -Wvla
QEMU has historically used variable length arrays only very rarely.
Variable length arrays are a potential security issue where an
on-stack dynamic allocation isn't correctly size-checked, especially
when the size comes from the guest.  (An example problem of this kind
from the past is CVE-2021-3527).  Forbidding them entirely is a
defensive measure against further bugs of this kind.

Enable -Wvla to prevent any new uses from sneaking into the codebase.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-ID: <20240125173211.1786196-3-peter.maydell@linaro.org>
[thuth: rebased to current master branch]
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240221162636.173136-4-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
2024-02-23 08:13:52 +01:00
Hyman Huang 52ed9f455e crypto: Introduce SM4 symmetric cipher algorithm
Introduce the SM4 cipher algorithms (OSCCA GB/T 32907-2016).

SM4 (GBT.32907-2016) is a cryptographic standard issued by the
Organization of State Commercial Administration of China (OSCCA)
as an authorized cryptographic algorithms for the use within China.

Detect the SM4 cipher algorithms and enable the feature silently
if it is available.

Signed-off-by: Hyman Huang <yong.huang@smartx.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2024-02-09 12:47:55 +00:00
Daniel P. Berrangé fdd51403a3 meson: sort C warning flags alphabetically
When scanning the list of warning flags to see if one is present, it is
helpful if they are in alphabetical order. It is further helpful to
separate out the 'no-' prefixed warnings.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2024-02-09 12:47:50 +00:00
Ilya Leoshkevich a1a9800e97 meson: Link with libinotify on FreeBSD
make vm-build-freebsd fails with:

    ld: error: undefined symbol: inotify_init1
    >>> referenced by filemonitor-inotify.c:183 (../src/util/filemonitor-inotify.c:183)
    >>>               util_filemonitor-inotify.c.o:(qemu_file_monitor_new) in archive libqemuutil.a

On FreeBSD the inotify functions are defined in libinotify.so. Add it
to the dependencies.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20240206002344.12372-5-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
2024-02-06 10:27:50 +01:00
Ninad Palsule 99f0c046f4 hw/fsi: Introduce IBM's Local bus
This is a part of patchset where IBM's Flexible Service Interface is
introduced.

The LBUS is modelled to maintain mapped memory for the devices. The
memory is mapped after CFAM config, peek table and FSI slave registers.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Ninad Palsule <ninad@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
[ clg: - removed lbus_add_device() bc unused
       - removed lbus_create_device() bc used only once
       - removed "address" property
       - updated meson.build to build fsi dir
       - included an empty hw/fsi/trace-events ]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
2024-02-01 08:13:30 +01:00
Stefan Hajnoczi 3bcc17f065 virtio-blk: move dataplane code into virtio-blk.c
The dataplane code used to be significantly different from the
non-dataplane code and therefore had a separate source file.

Over time the difference has gotten smaller because the I/O code paths
were unified. Nowadays the distinction between the VirtIOBlock and
VirtIOBlockDataPlane structs is more of an inconvenience that hinders
code simplification.

Move hw/block/dataplane/virtio-blk.c into hw/block/virtio-blk.c, merging
VirtIOBlockDataPlane's fields into VirtIOBlock.

hw/block/virtio-blk.c used VirtIOBlock->dataplane to check if
virtio_blk_data_plane_create() was successful. This is not necessary
because ->dataplane_started and ->dataplane_disabled can be used
instead. This patch makes those changes in order to drop
VirtIOBlock->dataplane.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20240119135748.270944-2-stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2024-01-26 11:16:58 +01:00
Daniel P. Berrangé 7ff9ff0393 meson: mitigate against use of uninitialize stack for exploits
When variables are used without being initialized, there is potential
to take advantage of data that was pre-existing on the stack from an
earlier call, to drive an exploit.

It is good practice to always initialize variables, and the compiler
can warn about flaws when -Wuninitialized is present. This warning,
however, is by no means foolproof with its output varying depending
on compiler version and which optimizations are enabled.

The -ftrivial-auto-var-init option can be used to tell the compiler
to always initialize all variables. This increases the security and
predictability of the program, closing off certain attack vectors,
reducing the risk of unsafe memory disclosure.

While the option takes several possible values, using 'zero' is
considered to be the  option that is likely to lead to semantically
correct or safe behaviour[1]. eg sizes/indexes are not likely to
lead to out-of-bounds accesses when initialized to zero. Pointers
are less likely to point something useful if initialized to zero.

Even with -ftrivial-auto-var-init=zero set, GCC will still issue
warnings with -Wuninitialized if it discovers a problem, so we are
not loosing diagnostics for developers, just hardening runtime
behaviour and making QEMU behave more predictably in case of hitting
bad codepaths.

[1] https://lists.llvm.org/pipermail/cfe-dev/2020-April/065221.html

Signed-off-by: "Daniel P. Berrangé" <berrange@redhat.com>
Message-ID: <20240103123414.2401208-3-berrange@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
2024-01-16 07:25:27 +01:00
Daniel P. Berrangé 043eaa0f0c meson: mitigate against ROP exploits with -fzero-call-used-regs
To quote wikipedia:

  "Return-oriented programming (ROP) is a computer security exploit
   technique that allows an attacker to execute code in the presence
   of security defenses such as executable space protection and code
   signing.

   In this technique, an attacker gains control of the call stack to
   hijack program control flow and then executes carefully chosen
   machine instruction sequences that are already present in the
   machine's memory, called "gadgets". Each gadget typically ends in
   a return instruction and is located in a subroutine within the
   existing program and/or shared library code. Chained together,
   these gadgets allow an attacker to perform arbitrary operations
   on a machine employing defenses that thwart simpler attacks."

QEMU is by no means perfect with an ever growing set of CVEs from
flawed hardware device emulation, which could potentially be
exploited using ROP techniques.

Since GCC 11 there has been a compiler option that can mitigate
against this exploit technique:

    -fzero-call-user-regs

To understand it refer to these two resources:

   https://www.jerkeby.se/newsletter/posts/rop-reduction-zero-call-user-regs/
   https://gcc.gnu.org/pipermail/gcc-patches/2020-August/552262.html

I used two programs to scan qemu-system-x86_64 for ROP gadgets:

  https://github.com/0vercl0k/rp
  https://github.com/JonathanSalwan/ROPgadget

When asked to find 8 byte gadgets, the 'rp' tool reports:

  A total of 440278 gadgets found.
  You decided to keep only the unique ones, 156143 unique gadgets found.

While the ROPgadget tool reports:

  Unique gadgets found: 353122

With the --ropchain argument, the latter attempts to use the found
gadgets to product a chain that can execute arbitrary syscalls. With
current QEMU it succeeds in this task, which is an undesirable
situation.

With QEMU modified to use -fzero-call-user-regs=used-gpr the 'rp' tool
reports

  A total of 528991 gadgets found.
  You decided to keep only the unique ones, 121128 unique gadgets found.

This is 22% fewer unique gadgets

While the ROPgadget tool reports:

  Unique gadgets found: 328605

This is 7% fewer unique gadgets. Crucially though, despite this more
modest reduction, the ROPgadget tool is no longer able to identify a
chain of gadgets for executing arbitrary syscalls. It fails at the
very first step, unable to find gadgets for populating registers for
a future syscall. Having said that, more advanced tools do still
manage to put together a viable ROP chain.

Also this only takes into account QEMU code. QEMU links to many 3rd
party shared libraries and ideally all of them would be compiled with
this same hardening. That becomes a distro policy question though.

In terms of performance impact, TCG was used as an evaluation test
case. We're not interested in protecting TCG since it isn't designed
to provide a security barrier, but it is performance sensitive code,
so useful as a guide to how other areas of QEMU might be impacted.
With the -fzero-call-user-regs=used-gpr argument present, using the
real world test of booting a linux kernel and having init immediately
poweroff, there is a ~1% slow down in performance under TCG. The QEMU
binary size also grows by approximately 1%.

By comparison, using the more aggressive -fzero-call-user-regs=all,
results in a slowdown of over 25% in TCG, which is clearly not an
acceptable impact, and a binary size increase of 5%.

Considering that 'used-gpr' successfully stopped ROPgadget assembling
a chain, this more targeted protection is a justifiable hardening
/ performance tradeoff.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: "Daniel P. Berrangé" <berrange@redhat.com>
Message-ID: <20240103123414.2401208-2-berrange@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
2024-01-16 07:24:22 +01:00
Peter Maydell b1b1585558 * Fix non-deterministic failures of the 'netdev-socket' qtest
* Fix device presence checking in the virtio-ccw qtest
 * Support codespell checking in checkpatch.pl
 * Fix emulation of LAE s390x instruction
 * Work around htags bug when environment is large
 * Some other small clean-ups here and there
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Merge tag 'pull-request-2024-01-11' of https://gitlab.com/thuth/qemu into staging

* Fix non-deterministic failures of the 'netdev-socket' qtest
* Fix device presence checking in the virtio-ccw qtest
* Support codespell checking in checkpatch.pl
* Fix emulation of LAE s390x instruction
* Work around htags bug when environment is large
* Some other small clean-ups here and there

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# gpg: Signature made Thu 11 Jan 2024 16:59:04 GMT
# gpg:                using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
# gpg:                issuer "thuth@redhat.com"
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [full]
# gpg:                 aka "Thomas Huth <thuth@redhat.com>" [full]
# gpg:                 aka "Thomas Huth <huth@tuxfamily.org>" [full]
# gpg:                 aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# Primary key fingerprint: 27B8 8847 EEE0 2501 18F3  EAB9 2ED9 D774 FE70 2DB5

* tag 'pull-request-2024-01-11' of https://gitlab.com/thuth/qemu:
  .gitlab-ci.d/buildtest.yml: Work around htags bug when environment is large
  tests/tcg/s390x: Test LOAD ADDRESS EXTENDED
  target/s390x: Fix LAE setting a wrong access register
  scripts/checkpatch: Support codespell checking
  hw/s390x/ccw: Replace dirname() with g_path_get_dirname()
  hw/s390x/ccw: Replace basename() with g_path_get_basename()
  target/s390x/kvm/pv: Provide some more useful information if decryption fails
  gitlab: fix s390x tag for avocado-system-centos
  tests/qtest/virtio-ccw: Fix device presence checking
  qtest: ensure netdev-socket tests have non-overlapping names
  net: handle QIOTask completion to report useful error message
  net: add explicit info about connecting/listening state
  Revert "tests/qtest/netdev-socket: Raise connection timeout to 120 seconds"
  Revert "osdep: add getloadavg"
  Revert "netdev: set timeout depending on loadavg"
  qtest: use correct boolean type for failover property
  q800: move dp8393x_prom memory region to Q800MachineState

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2024-01-12 14:02:31 +00:00
Tianrui Zhao 714b03c125 target/loongarch: Add loongarch kvm into meson build
Add kvm.c into meson.build to compile it when kvm
is configed. Meanwhile in meson.build, we set the
kvm_targets to loongarch64-softmmu when the cpu is
loongarch. And fix the compiling error when config
is enable-kvm,disable-tcg.

Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: xianglai li <lixianglai@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Message-Id: <20240105075804.1228596-10-zhaotianrui@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
2024-01-11 19:22:47 +08:00
Tianrui Zhao f8447436d3 target/loongarch: Implement kvm get/set registers
Implement kvm_arch_get/set_registers interfaces, many regs
can be get/set in the function, such as core regs, csr regs,
fpu regs, mp state, etc.

Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: xianglai li <lixianglai@loongson.cn>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Change-Id: Ia8fc48fe08b1768853f7729e77d37cdf270031e4
Message-Id: <20240105075804.1228596-5-zhaotianrui@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
2024-01-11 19:14:00 +08:00
Daniel P. Berrangé 1a2253c712 Revert "osdep: add getloadavg"
This reverts commit dc864d3a37.

This functionality is not required after the previous revert

Signed-off-by: "Daniel P. Berrangé" <berrange@redhat.com>
Message-ID: <20240104162942.211458-3-berrange@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
2024-01-11 11:39:26 +01:00
Philippe Mathieu-Daudé bf964322d6 meson: Allow building binary with no target-specific files in hw/
Allow  building a qemu-system-foo binary with target-agnostic
only HW models.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20231121203129.67999-1-philmd@linaro.org>
2024-01-05 16:20:14 +01:00
Alex Bennée f705c1f25d meson.build: report graphics backends separately
To enable accelerated VirtIO GPUs for the guest we need the rendering
support on the host, which currently it's reported in the configuration
summary under the "dependencies" section. Add a graphics backend section
and report the status of the VirGL and Rutabaga support libraries.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20231222114846.2850741-1-alex.bennee@linaro.org>
[Remove from dependencies as suggested by Philippe. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-12-31 09:11:29 +01:00
Paolo Bonzini d0cda6f461 configure, meson: rename targetos to host_os
This variable is about the host OS, not the target.  It is used a lot
more since the Meson conversion, but the original sin dates back to 2003.
Time to fix it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-12-31 09:11:29 +01:00
Paolo Bonzini cfc1a889e5 meson: rename config_all
config_all now lists only accelerators, rename it to indicate its actual
content.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-12-31 09:11:28 +01:00
Paolo Bonzini 0d66549cf5 meson: remove CONFIG_ALL
CONFIG_ALL is tricky to use and was ported over to Meson from the
recursive processing of Makefile variables.  Meson sourcesets
however have all_sources() and all_dependencies() methods that
remove the need for it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-12-31 09:11:28 +01:00
Paolo Bonzini 1220f5813a meson: remove config_targetos
config_targetos is now empty and can be removed; its use in sourcesets
that do not involve target-specific files can be replaced with an empty
dictionary.

In fact, at this point *all* sourcesets that do not involve
target-specific files are just glorified mutable arrays.  Enforce that
they never test for symbols in "when:" by computing the set of files
without "strict: false".

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-12-31 09:11:28 +01:00
Paolo Bonzini dc4954943d meson: remove CONFIG_POSIX and CONFIG_WIN32 from config_targetos
For consistency with other OSes, use if...endif for rules that are
target-independent.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-12-31 09:11:28 +01:00
Paolo Bonzini 53e8868d69 meson: remove OS definitions from config_targetos
CONFIG_DARWIN, CONFIG_LINUX and CONFIG_BSD are used in some rules, but
only CONFIG_LINUX has substantial use.  Convert them all to if...endif.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-12-31 09:11:28 +01:00
Paolo Bonzini e7c22ff87a meson: always probe u2f and canokey if the option is enabled
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-12-31 09:11:28 +01:00
Paolo Bonzini 9cd76c9111 meson: move subdirs to "Collect sources" section
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-12-31 09:11:28 +01:00
Paolo Bonzini 95933f13a0 meson: move config-host.h definitions together
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-12-31 09:11:28 +01:00
Paolo Bonzini 82761296d2 meson: move CFI detection code with other compiler flags
Keep it together with the other compiler modes, and before dependencies.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-12-31 09:11:28 +01:00
Paolo Bonzini a775c7130c meson: keep subprojects together
And move away dependencies that are not subprojects anymore.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-12-31 09:11:28 +01:00