From: Thomas Huth <thuth@redhat.com>
To: qemu-devel@nongnu.org, Paolo Bonzini <pbonzini@redhat.com>
Cc: devel@lists.libvirt.org,
"Philippe Mathieu-Daudé" <philmd@linaro.org>,
"Daniel P . Berrangé" <berrange@redhat.com>,
"Claudio Imbrenda" <imbrenda@linux.ibm.com>
Subject: [PATCH v2] qemu-options: Deprecate "-runas" and introduce "-run-with user=..." instead
Date: Mon, 6 May 2024 13:20:58 +0200 [thread overview]
Message-ID: <20240506112058.51446-1-thuth@redhat.com> (raw)
The old "-runas" option has the disadvantage that it is not visible
in the QAPI schema, so it is not available via the normal introspection
mechanisms. We've recently introduced the "-run-with" option for exactly
this purpose, which is meant to handle the options that affect the
runtime behavior. Thus let's introduce a "user=..." parameter here now
and deprecate the old "-runas" option.
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
v2: Add missing part in qemu-options.hx as suggested by Philippe
docs/about/deprecated.rst | 6 ++++++
system/vl.c | 15 +++++++++++++++
qemu-options.hx | 15 +++++++++++----
3 files changed, 32 insertions(+), 4 deletions(-)
diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
index 3310df3274..fe69e2d44c 100644
--- a/docs/about/deprecated.rst
+++ b/docs/about/deprecated.rst
@@ -61,6 +61,12 @@ configurations (e.g. -smp drawers=1,books=1,clusters=1 for x86 PC machine) is
marked deprecated since 9.0, users have to ensure that all the topology members
described with -smp are supported by the target machine.
+``-runas`` (since 9.1)
+----------------------
+
+Use ``-run-with user=..`` instead.
+
+
User-mode emulator command line arguments
-----------------------------------------
diff --git a/system/vl.c b/system/vl.c
index 7756eac81e..b031427440 100644
--- a/system/vl.c
+++ b/system/vl.c
@@ -773,6 +773,10 @@ static QemuOptsList qemu_run_with_opts = {
.name = "chroot",
.type = QEMU_OPT_STRING,
},
+ {
+ .name = "user",
+ .type = QEMU_OPT_STRING,
+ },
{ /* end of list */ }
},
};
@@ -3586,6 +3590,7 @@ void qemu_init(int argc, char **argv)
break;
#if defined(CONFIG_POSIX)
case QEMU_OPTION_runas:
+ warn_report("-runas is deprecated, use '-run-with user=...' instead");
if (!os_set_runas(optarg)) {
error_report("User \"%s\" doesn't exist"
" (and is not <uid>:<gid>)",
@@ -3612,6 +3617,16 @@ void qemu_init(int argc, char **argv)
if (str) {
os_set_chroot(str);
}
+ str = qemu_opt_get(opts, "user");
+ if (str) {
+ if (!os_set_runas(str)) {
+ error_report("User \"%s\" doesn't exist"
+ " (and is not <uid>:<gid>)",
+ optarg);
+ exit(1);
+ }
+ }
+
break;
}
#endif /* CONFIG_POSIX */
diff --git a/qemu-options.hx b/qemu-options.hx
index cf61f6b863..3031479a15 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -4824,7 +4824,8 @@ DEF("runas", HAS_ARG, QEMU_OPTION_runas, \
SRST
``-runas user``
Immediately before starting guest execution, drop root privileges,
- switching to the specified user.
+ switching to the specified user. This option is deprecated, use
+ ``-run-with user=...`` instead.
ERST
DEF("prom-env", HAS_ARG, QEMU_OPTION_prom_env,
@@ -4990,13 +4991,15 @@ DEF("qtest-log", HAS_ARG, QEMU_OPTION_qtest_log, "", QEMU_ARCH_ALL)
#ifdef CONFIG_POSIX
DEF("run-with", HAS_ARG, QEMU_OPTION_run_with,
- "-run-with [async-teardown=on|off][,chroot=dir]\n"
+ "-run-with [async-teardown=on|off][,chroot=dir][user=username|uid:gid]\n"
" Set miscellaneous QEMU process lifecycle options:\n"
" async-teardown=on enables asynchronous teardown (Linux only)\n"
- " chroot=dir chroot to dir just before starting the VM\n",
+ " chroot=dir chroot to dir just before starting the VM\n"
+ " user=username switch to the specified user before starting the VM\n"
+ " user=uid:gid dito, but use specified user-ID and group-ID instead\n",
QEMU_ARCH_ALL)
SRST
-``-run-with [async-teardown=on|off][,chroot=dir]``
+``-run-with [async-teardown=on|off][,chroot=dir][user=username|uid:gid]``
Set QEMU process lifecycle options.
``async-teardown=on`` enables asynchronous teardown. A new process called
@@ -5013,6 +5016,10 @@ SRST
``chroot=dir`` can be used for doing a chroot to the specified directory
immediately before starting the guest execution. This is especially useful
in combination with -runas.
+
+ ``user=username`` or ``user=uid:gid`` can be used to drop root privileges
+ by switching to the specified user (via username) or user and group
+ (via uid:gid) immediately before starting guest execution.
ERST
#endif
--
2.45.0
next reply other threads:[~2024-05-06 11:22 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-06 11:20 Thomas Huth [this message]
2024-05-06 11:42 ` [PATCH v2] qemu-options: Deprecate "-runas" and introduce "-run-with user=..." instead Philippe Mathieu-Daudé
2024-05-06 13:10 ` Paolo Bonzini
2024-05-08 13:20 ` Claudio Fontana
2024-05-08 14:00 ` Thomas Huth
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