On 5/6/24 13:20, Thomas Huth wrote:
> 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@xxxxxxxxxx>
> ---
> 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",
nit: ditto?
Ciao,
C
> 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
>
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