|
 |
ae23c9 |
From caa17bcb65ea65a9fa39e7d6117a87cc7cc9c0ce Mon Sep 17 00:00:00 2001
|
|
|
ae23c9 |
From: Eduardo Otubo <otubo@redhat.com>
|
|
|
ae23c9 |
Date: Fri, 28 Sep 2018 07:56:37 +0100
|
|
|
ae23c9 |
Subject: [PATCH 3/6] seccomp: prefer SCMP_ACT_KILL_PROCESS if available
|
|
|
ae23c9 |
MIME-Version: 1.0
|
|
|
ae23c9 |
Content-Type: text/plain; charset=UTF-8
|
|
|
ae23c9 |
Content-Transfer-Encoding: 8bit
|
|
|
ae23c9 |
|
|
|
ae23c9 |
RH-Author: Eduardo Otubo <otubo@redhat.com>
|
|
|
ae23c9 |
Message-id: <20180928075639.16746-4-otubo@redhat.com>
|
|
|
ae23c9 |
Patchwork-id: 82315
|
|
|
ae23c9 |
O-Subject: [RHEL-8 qemu-kvm PATCH 3/5] seccomp: prefer SCMP_ACT_KILL_PROCESS if available
|
|
|
ae23c9 |
Bugzilla: 1618356
|
|
|
ae23c9 |
RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
|
|
ae23c9 |
RH-Acked-by: Marc-André Lureau <marcandre.lureau@redhat.com>
|
|
|
ae23c9 |
RH-Acked-by: Thomas Huth <thuth@redhat.com>
|
|
|
ae23c9 |
|
|
|
ae23c9 |
From: Marc-André Lureau <marcandre.lureau@redhat.com>
|
|
|
ae23c9 |
|
|
|
ae23c9 |
commit bda08a5764d470f101fa38635d30b41179a313e1
|
|
|
ae23c9 |
Author: Marc-André Lureau <marcandre.lureau@redhat.com>
|
|
|
ae23c9 |
Date: Wed Aug 22 19:02:48 2018 +0200
|
|
|
ae23c9 |
|
|
|
ae23c9 |
seccomp: prefer SCMP_ACT_KILL_PROCESS if available
|
|
|
ae23c9 |
|
|
|
ae23c9 |
The upcoming libseccomp release should have SCMP_ACT_KILL_PROCESS
|
|
|
ae23c9 |
action (https://github.com/seccomp/libseccomp/issues/96).
|
|
|
ae23c9 |
|
|
|
ae23c9 |
SCMP_ACT_KILL_PROCESS is preferable to immediately terminate the
|
|
|
ae23c9 |
offending process, rather than having the SIGSYS handler running.
|
|
|
ae23c9 |
|
|
|
ae23c9 |
Use SECCOMP_GET_ACTION_AVAIL to check availability of kernel support,
|
|
|
ae23c9 |
as libseccomp will fallback on SCMP_ACT_KILL otherwise, and we still
|
|
|
ae23c9 |
prefer SCMP_ACT_TRAP.
|
|
|
ae23c9 |
|
|
|
ae23c9 |
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
|
|
|
ae23c9 |
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
|
|
|
ae23c9 |
Acked-by: Eduardo Otubo <otubo@redhat.com>
|
|
|
ae23c9 |
|
|
|
ae23c9 |
Signed-off-by: Eduardo Otubo <otubo@rehdat.com>
|
|
|
ae23c9 |
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
|
|
|
ae23c9 |
---
|
|
|
ae23c9 |
qemu-seccomp.c | 31 ++++++++++++++++++++++++++++++-
|
|
|
ae23c9 |
1 file changed, 30 insertions(+), 1 deletion(-)
|
|
|
ae23c9 |
|
|
|
ae23c9 |
diff --git a/qemu-seccomp.c b/qemu-seccomp.c
|
|
|
ae23c9 |
index b88fa05..10fcfa3 100644
|
|
|
ae23c9 |
--- a/qemu-seccomp.c
|
|
|
ae23c9 |
+++ b/qemu-seccomp.c
|
|
|
ae23c9 |
@@ -15,6 +15,7 @@
|
|
|
ae23c9 |
#include "qemu/osdep.h"
|
|
|
ae23c9 |
#include <seccomp.h>
|
|
|
ae23c9 |
#include "sysemu/seccomp.h"
|
|
|
ae23c9 |
+#include <linux/seccomp.h>
|
|
|
ae23c9 |
|
|
|
ae23c9 |
/* For some architectures (notably ARM) cacheflush is not supported until
|
|
|
ae23c9 |
* libseccomp 2.2.3, but configure enforces that we are using a more recent
|
|
|
ae23c9 |
@@ -102,12 +103,40 @@ static const struct QemuSeccompSyscall blacklist[] = {
|
|
|
ae23c9 |
{ SCMP_SYS(sched_get_priority_min), QEMU_SECCOMP_SET_RESOURCECTL },
|
|
|
ae23c9 |
};
|
|
|
ae23c9 |
|
|
|
ae23c9 |
+static inline __attribute__((unused)) int
|
|
|
ae23c9 |
+qemu_seccomp(unsigned int operation, unsigned int flags, void *args)
|
|
|
ae23c9 |
+{
|
|
|
ae23c9 |
+#ifdef __NR_seccomp
|
|
|
ae23c9 |
+ return syscall(__NR_seccomp, operation, flags, args);
|
|
|
ae23c9 |
+#else
|
|
|
ae23c9 |
+ errno = ENOSYS;
|
|
|
ae23c9 |
+ return -1;
|
|
|
ae23c9 |
+#endif
|
|
|
ae23c9 |
+}
|
|
|
ae23c9 |
+
|
|
|
ae23c9 |
+static uint32_t qemu_seccomp_get_kill_action(void)
|
|
|
ae23c9 |
+{
|
|
|
ae23c9 |
+#if defined(SECCOMP_GET_ACTION_AVAIL) && defined(SCMP_ACT_KILL_PROCESS) && \
|
|
|
ae23c9 |
+ defined(SECCOMP_RET_KILL_PROCESS)
|
|
|
ae23c9 |
+ {
|
|
|
ae23c9 |
+ uint32_t action = SECCOMP_RET_KILL_PROCESS;
|
|
|
ae23c9 |
+
|
|
|
ae23c9 |
+ if (qemu_seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &action) == 0) {
|
|
|
ae23c9 |
+ return SCMP_ACT_KILL_PROCESS;
|
|
|
ae23c9 |
+ }
|
|
|
ae23c9 |
+ }
|
|
|
ae23c9 |
+#endif
|
|
|
ae23c9 |
+
|
|
|
ae23c9 |
+ return SCMP_ACT_TRAP;
|
|
|
ae23c9 |
+}
|
|
|
ae23c9 |
+
|
|
|
ae23c9 |
|
|
|
ae23c9 |
int seccomp_start(uint32_t seccomp_opts)
|
|
|
ae23c9 |
{
|
|
|
ae23c9 |
int rc = 0;
|
|
|
ae23c9 |
unsigned int i = 0;
|
|
|
ae23c9 |
scmp_filter_ctx ctx;
|
|
|
ae23c9 |
+ uint32_t action = qemu_seccomp_get_kill_action();
|
|
|
ae23c9 |
|
|
|
ae23c9 |
ctx = seccomp_init(SCMP_ACT_ALLOW);
|
|
|
ae23c9 |
if (ctx == NULL) {
|
|
|
ae23c9 |
@@ -120,7 +149,7 @@ int seccomp_start(uint32_t seccomp_opts)
|
|
|
ae23c9 |
continue;
|
|
|
ae23c9 |
}
|
|
|
ae23c9 |
|
|
|
ae23c9 |
- rc = seccomp_rule_add_array(ctx, SCMP_ACT_TRAP, blacklist[i].num,
|
|
|
ae23c9 |
+ rc = seccomp_rule_add_array(ctx, action, blacklist[i].num,
|
|
|
ae23c9 |
blacklist[i].narg, blacklist[i].arg_cmp);
|
|
|
ae23c9 |
if (rc < 0) {
|
|
|
ae23c9 |
goto seccomp_return;
|
|
|
ae23c9 |
--
|
|
|
ae23c9 |
1.8.3.1
|
|
|
ae23c9 |
|