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qemu-options: Deprecate "-runas" and introduce "-run-with user=..." instead

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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.

Message-ID: <20240506112058.51446-1-thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Thomas Huth 2024-05-06 13:20:58 +02:00
parent 6e55b32d45
commit 95e0fb0afa
3 changed files with 32 additions and 4 deletions
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6
docs/about/deprecated.rst
View File

@ -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
-----------------------------------------

15
qemu-options.hx
View File

@ -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 ditto, 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

15
system/vl.c
View File

@ -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 */