From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49076) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dqFJT-0001CV-IS for qemu-devel@nongnu.org; Fri, 08 Sep 2017 05:11:04 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dqFJO-0002yq-M9 for qemu-devel@nongnu.org; Fri, 08 Sep 2017 05:10:59 -0400 Received: from mx1.redhat.com ([209.132.183.28]:50680) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dqFJO-0002y3-Cy for qemu-devel@nongnu.org; Fri, 08 Sep 2017 05:10:54 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 81FC180461 for ; Fri, 8 Sep 2017 09:10:53 +0000 (UTC) From: Eduardo Otubo Date: Fri, 8 Sep 2017 11:10:27 +0200 Message-Id: <20170908091027.9104-6-otubo@redhat.com> In-Reply-To: <20170908091027.9104-1-otubo@redhat.com> References: <20170908091027.9104-1-otubo@redhat.com> Subject: [Qemu-devel] [PATCHv5 5/5] seccomp: add resourcecontrol argument to command line List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: thuth@redhat.com, "Daniel P . Berrange" This patch adds [,resourcecontrol=deny] to `-sandbox on' option. It blacklists all process affinity and scheduler priority system calls to avoid any bigger of the process. Signed-off-by: Eduardo Otubo --- include/sysemu/seccomp.h | 1 + qemu-options.hx | 9 ++++++--- qemu-seccomp.c | 19 +++++++++++++++++++ vl.c | 16 ++++++++++++++++ 4 files changed, 42 insertions(+), 3 deletions(-) diff --git a/include/sysemu/seccomp.h b/include/sysemu/seccomp.h index 3ab5fc4f61..e67c2dc840 100644 --- a/include/sysemu/seccomp.h +++ b/include/sysemu/seccomp.h @@ -19,6 +19,7 @@ #define QEMU_SECCOMP_SET_OBSOLETE (1 << 1) #define QEMU_SECCOMP_SET_PRIVILEGED (1 << 2) #define QEMU_SECCOMP_SET_SPAWN (1 << 3) +#define QEMU_SECCOMP_SET_RESOURCECTL (1 << 4) #include diff --git a/qemu-options.hx b/qemu-options.hx index 2b04b9f170..600614f6e5 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -4018,7 +4018,7 @@ ETEXI DEF("sandbox", HAS_ARG, QEMU_OPTION_sandbox, \ "-sandbox on[,obsolete=allow|deny][,elevateprivileges=allow|deny|children]\n" \ - " [,spawn=allow|deny]\n" \ + " [,spawn=allow|deny][,resourcecontrol=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" \ @@ -4028,10 +4028,11 @@ DEF("sandbox", HAS_ARG, QEMU_OPTION_sandbox, \ " 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" \ " use 'spawn' to avoid QEMU to spawn new threads or processes by\n" \ - " blacklisting *fork and execve\n", + " blacklisting *fork and execve\n" \ + " use 'resourcecontrol' to disable process affinity and schedular priority\n", QEMU_ARCH_ALL) STEXI -@item -sandbox @var{arg}[,obsolete=@var{string}][,elevateprivileges=@var{string}][,spawn=@var{string}] +@item -sandbox @var{arg}[,obsolete=@var{string}][,elevateprivileges=@var{string}][,spawn=@var{string}][,resourcecontrol=@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'. @@ -4042,6 +4043,8 @@ Enable Obsolete system calls Disable set*uid|gid system calls @item spawn=@var{string} Disable *fork and execve +@item resourcecontrol=@var{string} +Disable process affinity and schedular priority @end table ETEXI diff --git a/qemu-seccomp.c b/qemu-seccomp.c index 4c169febf8..e7c19c8165 100644 --- a/qemu-seccomp.c +++ b/qemu-seccomp.c @@ -83,6 +83,17 @@ static const struct QemuSeccompSyscall blacklist[] = { { SCMP_SYS(fork), 8, QEMU_SECCOMP_SET_SPAWN }, { SCMP_SYS(vfork), 8, QEMU_SECCOMP_SET_SPAWN }, { SCMP_SYS(execve), 8, QEMU_SECCOMP_SET_SPAWN }, + /* resource control */ + { SCMP_SYS(getpriority), 16, QEMU_SECCOMP_SET_RESOURCECTL }, + { SCMP_SYS(setpriority), 16, QEMU_SECCOMP_SET_RESOURCECTL }, + { SCMP_SYS(sched_setparam), 16, QEMU_SECCOMP_SET_RESOURCECTL }, + { SCMP_SYS(sched_getparam), 16, QEMU_SECCOMP_SET_RESOURCECTL }, + { SCMP_SYS(sched_setscheduler), 16, QEMU_SECCOMP_SET_RESOURCECTL }, + { SCMP_SYS(sched_getscheduler), 16, QEMU_SECCOMP_SET_RESOURCECTL }, + { SCMP_SYS(sched_setaffinity), 16, QEMU_SECCOMP_SET_RESOURCECTL }, + { SCMP_SYS(sched_getaffinity), 16, QEMU_SECCOMP_SET_RESOURCECTL }, + { SCMP_SYS(sched_get_priority_max), 16, QEMU_SECCOMP_SET_RESOURCECTL }, + { SCMP_SYS(sched_get_priority_min), 16, QEMU_SECCOMP_SET_RESOURCECTL }, }; @@ -121,6 +132,14 @@ int seccomp_start(uint32_t seccomp_opts) } break; + case QEMU_SECCOMP_SET_RESOURCECTL: + if (seccomp_opts & QEMU_SECCOMP_SET_RESOURCECTL) { + break; + } else { + continue; + } + + break; default: break; } diff --git a/vl.c b/vl.c index 0af137da17..ce3883ccb1 100644 --- a/vl.c +++ b/vl.c @@ -284,6 +284,10 @@ static QemuOptsList qemu_sandbox_opts = { .name = "spawn", .type = QEMU_OPT_STRING, }, + { + .name = "resourcecontrol", + .type = QEMU_OPT_STRING, + }, { /* end of list */ } }, }; @@ -1097,6 +1101,18 @@ static int parse_sandbox(void *opaque, QemuOpts *opts, Error **errp) } } + value = qemu_opt_get(opts, "resourcecontrol"); + if (value) { + if (g_str_equal(value, "deny")) { + seccomp_opts |= QEMU_SECCOMP_SET_RESOURCECTL; + } else if (g_str_equal(value, "allow")) { + /* default value */ + } else { + error_report("invalid argument for resourcecontrol"); + return -1; + } + } + if (seccomp_start(seccomp_opts) < 0) { error_report("failed to install seccomp syscall filter " "in the kernel"); -- 2.13.5