From 995a226f880b807e05240e8752d6ce65679775be Mon Sep 17 00:00:00 2001 From: Eduardo Otubo Date: Mon, 13 Mar 2017 22:16:01 +0100 Subject: seccomp: add spawn argument to command line This patch adds [,spawn=deny] argument to `-sandbox on' option. It blacklists fork and execve system calls, avoiding Qemu to spawn new threads or processes. Signed-off-by: Eduardo Otubo --- qemu-options.hx | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'qemu-options.hx') diff --git a/qemu-options.hx b/qemu-options.hx index 5c1b163fb5..2b04b9f170 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -4018,6 +4018,7 @@ ETEXI DEF("sandbox", HAS_ARG, QEMU_OPTION_sandbox, \ "-sandbox on[,obsolete=allow|deny][,elevateprivileges=allow|deny|children]\n" \ + " [,spawn=allow|deny]\n" \ " Enable seccomp mode 2 system call filter (default 'off').\n" \ " use 'obsolete' to allow obsolete system calls that are provided\n" \ " by the kernel, but typically no longer used by modern\n" \ @@ -4025,10 +4026,12 @@ DEF("sandbox", HAS_ARG, QEMU_OPTION_sandbox, \ " use 'elevateprivileges' to allow or deny QEMU process to elevate\n" \ " its privileges by blacklisting all set*uid|gid system calls.\n" \ " The value 'children' will deny set*uid|gid system calls for\n" \ - " main QEMU process but will allow forks and execves to run unprivileged\n", + " main QEMU process but will allow forks and execves to run unprivileged\n" \ + " use 'spawn' to avoid QEMU to spawn new threads or processes by\n" \ + " blacklisting *fork and execve\n", QEMU_ARCH_ALL) STEXI -@item -sandbox @var{arg}[,obsolete=@var{string}][,elevateprivileges=@var{string}] +@item -sandbox @var{arg}[,obsolete=@var{string}][,elevateprivileges=@var{string}][,spawn=@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'. @@ -4037,6 +4040,8 @@ disable it. The default is 'off'. Enable Obsolete system calls @item elevateprivileges=@var{string} Disable set*uid|gid system calls +@item spawn=@var{string} +Disable *fork and execve @end table ETEXI -- cgit v1.2.3