On 28.07.2017 14:10, Eduardo Otubo wrote:
> This patch introduces the new argument
> [,elevateprivileges=allow|deny|children] to the `-sandbox on'. It allows
> or denies Qemu process to elevate its privileges by blacklisting all
> set*uid|gid system calls. The 'children' option will let forks and
> execves run unprivileged.
>
> Signed-off-by: Eduardo Otubo <ot...@redhat.com>
> ---
> include/sysemu/seccomp.h | 1 +
> qemu-options.hx | 9 ++++++---
> qemu-seccomp.c | 29 +++++++++++++++++++++++++++++
> vl.c | 22 ++++++++++++++++++++++
> 4 files changed, 58 insertions(+), 3 deletions(-)
>
> diff --git a/include/sysemu/seccomp.h b/include/sysemu/seccomp.h
> index 7a7bde246b..e6e78d85ce 100644
> --- a/include/sysemu/seccomp.h
> +++ b/include/sysemu/seccomp.h
> @@ -16,6 +16,7 @@
> #define QEMU_SECCOMP_H
>
> #define OBSOLETE 0x0001
> +#define PRIVILEGED 0x0010
>
> #include <seccomp.h>
>
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 54e492f36a..34d33a812e 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -4004,17 +4004,20 @@ Old param mode (ARM only).
> ETEXI
>
> DEF("sandbox", HAS_ARG, QEMU_OPTION_sandbox, \
> - "-sandbox on[,obsolete=allow] Enable seccomp mode 2 system call filter
> (default 'off').\n" \
> - " obsolete: Allow obsolete system calls\n",
> + "-sandbox on[,obsolete=allow][,elevateprivileges=allow|deny|children]
> Enable seccomp mode 2 system call filter (default 'off').\n" \
Most other boolean-like options use "on|off" as possible values ...
maybe it would be nicer to use "on|off" instead of "allow|deny" here, too?
> + " obsolete: Allow obsolete system calls\n"
> + " elevateprivileges: allows or denies Qemu process to
> elevate its privileges by blacklisting all set*uid|gid system calls.
> 'children' will deny set*uid|gid system calls for main Qemu process but will
> allow forks and execves to run unprivileged\n",
Correct spelling is "QEMU" with all capital letters, not "Qemu"
> QEMU_ARCH_ALL)
> STEXI
> -@item -sandbox @var{arg}[,obsolete=@var{string}]
> +@item -sandbox
> @var{arg}[,obsolete=@var{string}][,elevateprivileges=@var{string}]
> @findex -sandbox
> Enable Seccomp mode 2 system call filter. 'on' will enable syscall filtering
> and 'off' will
> disable it. The default is 'off'.
> @table @option
> @item obsolete=@var{string}
> Enable Obsolete system calls
> +@item elevateprivileges=@var{string}
> +Disable set*uid|gid systema calls
s/systema/system/
Thomas
