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From caa17bcb65ea65a9fa39e7d6117a87cc7cc9c0ce Mon Sep 17 00:00:00 2001
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From: Eduardo Otubo <otubo@redhat.com>
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Date: Fri, 28 Sep 2018 07:56:37 +0100
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Subject: [PATCH 3/6] seccomp: prefer SCMP_ACT_KILL_PROCESS if available
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Eduardo Otubo <otubo@redhat.com>
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Message-id: <20180928075639.16746-4-otubo@redhat.com>
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Patchwork-id: 82315
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O-Subject: [RHEL-8 qemu-kvm PATCH 3/5] seccomp: prefer SCMP_ACT_KILL_PROCESS if available
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Bugzilla: 1618356
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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RH-Acked-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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From: Marc-André Lureau <marcandre.lureau@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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commit bda08a5764d470f101fa38635d30b41179a313e1
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Author: Marc-André Lureau <marcandre.lureau@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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Date: Wed Aug 22 19:02:48 2018 +0200
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seccomp: prefer SCMP_ACT_KILL_PROCESS if available
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
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ae23c9 |
The upcoming libseccomp release should have SCMP_ACT_KILL_PROCESS
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action (https://github.com/seccomp/libseccomp/issues/96).
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ae23c9 |
SCMP_ACT_KILL_PROCESS is preferable to immediately terminate the
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offending process, rather than having the SIGSYS handler running.
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Use SECCOMP_GET_ACTION_AVAIL to check availability of kernel support,
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as libseccomp will fallback on SCMP_ACT_KILL otherwise, and we still
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prefer SCMP_ACT_TRAP.
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Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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Acked-by: Eduardo Otubo <otubo@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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Signed-off-by: Eduardo Otubo <otubo@rehdat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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qemu-seccomp.c | 31 ++++++++++++++++++++++++++++++-
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1 file changed, 30 insertions(+), 1 deletion(-)
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diff --git a/qemu-seccomp.c b/qemu-seccomp.c
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index b88fa05..10fcfa3 100644
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--- a/qemu-seccomp.c
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+++ b/qemu-seccomp.c
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@@ -15,6 +15,7 @@
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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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+#include <linux/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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@@ -102,12 +103,40 @@ static const struct QemuSeccompSyscall blacklist[] = {
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{ SCMP_SYS(sched_get_priority_min), QEMU_SECCOMP_SET_RESOURCECTL },
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};
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+static inline __attribute__((unused)) int
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+qemu_seccomp(unsigned int operation, unsigned int flags, void *args)
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+{
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+#ifdef __NR_seccomp
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+ return syscall(__NR_seccomp, operation, flags, args);
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+#else
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+ errno = ENOSYS;
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+ return -1;
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+#endif
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+}
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+
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+static uint32_t qemu_seccomp_get_kill_action(void)
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+{
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+#if defined(SECCOMP_GET_ACTION_AVAIL) && defined(SCMP_ACT_KILL_PROCESS) && \
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+ defined(SECCOMP_RET_KILL_PROCESS)
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+ {
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+ uint32_t action = SECCOMP_RET_KILL_PROCESS;
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+
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+ if (qemu_seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &action) == 0) {
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+ return SCMP_ACT_KILL_PROCESS;
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+ }
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+ }
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+#endif
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+
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+ return SCMP_ACT_TRAP;
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+}
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+
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int seccomp_start(uint32_t seccomp_opts)
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{
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
int rc = 0;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
unsigned int i = 0;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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scmp_filter_ctx ctx;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ uint32_t action = qemu_seccomp_get_kill_action();
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
ctx = seccomp_init(SCMP_ACT_ALLOW);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
if (ctx == NULL) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
@@ -120,7 +149,7 @@ int seccomp_start(uint32_t seccomp_opts)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
continue;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
}
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
- rc = seccomp_rule_add_array(ctx, SCMP_ACT_TRAP, blacklist[i].num,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ rc = seccomp_rule_add_array(ctx, action, blacklist[i].num,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
blacklist[i].narg, blacklist[i].arg_cmp);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
if (rc < 0) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
goto seccomp_return;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
--
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
1.8.3.1
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
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