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2b716fa6d6
This patch introduces the argument [,obsolete=allow] to the `-sandbox on' option. It allows Qemu to run safely on old system that still relies on old system calls. Signed-off-by: Eduardo Otubo <otubo@redhat.com>
102 lines
3.8 KiB
C
102 lines
3.8 KiB
C
/*
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* QEMU seccomp mode 2 support with libseccomp
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*
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* Copyright IBM, Corp. 2012
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*
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* Authors:
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* Eduardo Otubo <eotubo@br.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "qemu/osdep.h"
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#include <seccomp.h>
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#include "sysemu/seccomp.h"
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/* For some architectures (notably ARM) cacheflush is not supported until
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* libseccomp 2.2.3, but configure enforces that we are using a more recent
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* version on those hosts, so it is OK for this check to be less strict.
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*/
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#if SCMP_VER_MAJOR >= 3
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#define HAVE_CACHEFLUSH
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#elif SCMP_VER_MAJOR == 2 && SCMP_VER_MINOR >= 2
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#define HAVE_CACHEFLUSH
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#endif
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struct QemuSeccompSyscall {
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int32_t num;
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uint8_t set;
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};
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static const struct QemuSeccompSyscall blacklist[] = {
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/* default set of syscalls to blacklist */
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{ SCMP_SYS(reboot), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(swapon), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(swapoff), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(syslog), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(mount), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(umount), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(kexec_load), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(afs_syscall), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(break), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(ftime), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(getpmsg), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(gtty), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(lock), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(mpx), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(prof), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(profil), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(putpmsg), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(security), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(stty), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(tuxcall), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(ulimit), QEMU_SECCOMP_SET_DEFAULT },
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{ SCMP_SYS(vserver), QEMU_SECCOMP_SET_DEFAULT },
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/* obsolete */
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{ SCMP_SYS(readdir), QEMU_SECCOMP_SET_OBSOLETE },
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{ SCMP_SYS(_sysctl), QEMU_SECCOMP_SET_OBSOLETE },
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{ SCMP_SYS(bdflush), QEMU_SECCOMP_SET_OBSOLETE },
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{ SCMP_SYS(create_module), QEMU_SECCOMP_SET_OBSOLETE },
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{ SCMP_SYS(get_kernel_syms), QEMU_SECCOMP_SET_OBSOLETE },
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{ SCMP_SYS(query_module), QEMU_SECCOMP_SET_OBSOLETE },
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{ SCMP_SYS(sgetmask), QEMU_SECCOMP_SET_OBSOLETE },
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{ SCMP_SYS(ssetmask), QEMU_SECCOMP_SET_OBSOLETE },
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{ SCMP_SYS(sysfs), QEMU_SECCOMP_SET_OBSOLETE },
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{ SCMP_SYS(uselib), QEMU_SECCOMP_SET_OBSOLETE },
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{ SCMP_SYS(ustat), QEMU_SECCOMP_SET_OBSOLETE },
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};
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int seccomp_start(uint32_t seccomp_opts)
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{
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int rc = 0;
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unsigned int i = 0;
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scmp_filter_ctx ctx;
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ctx = seccomp_init(SCMP_ACT_ALLOW);
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if (ctx == NULL) {
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rc = -1;
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goto seccomp_return;
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}
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for (i = 0; i < ARRAY_SIZE(blacklist); i++) {
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if (!(seccomp_opts & blacklist[i].set)) {
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continue;
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}
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rc = seccomp_rule_add(ctx, SCMP_ACT_KILL, blacklist[i].num, 0);
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if (rc < 0) {
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goto seccomp_return;
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}
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}
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rc = seccomp_load(ctx);
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seccomp_return:
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seccomp_release(ctx);
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return rc;
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}
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