[PATCH V1 24/26] seccomp: cpr-exec blocker

[Steve Sistare]

cpr-exec mode needs permission to exec.  Block it if permission is denied.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
---
 include/sysemu/seccomp.h |  1 +
 system/qemu-seccomp.c    | 10 ++++++++--
 system/vl.c              |  6 ++++++
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/include/sysemu/seccomp.h b/include/sysemu/seccomp.h
index fe85989..023c0a1 100644
--- a/include/sysemu/seccomp.h
+++ b/include/sysemu/seccomp.h
@@ -22,5 +22,6 @@
 #define QEMU_SECCOMP_SET_RESOURCECTL (1 << 4)
 
 int parse_sandbox(void *opaque, QemuOpts *opts, Error **errp);
+uint32_t qemu_seccomp_get_opts(void);
 
 #endif
diff --git a/system/qemu-seccomp.c b/system/qemu-seccomp.c
index 5c20ac0..0d2a561 100644
--- a/system/qemu-seccomp.c
+++ b/system/qemu-seccomp.c
@@ -360,12 +360,18 @@ static int seccomp_start(uint32_t seccomp_opts, Error 
**errp)
     return rc < 0 ? -1 : 0;
 }
 
+static uint32_t seccomp_opts;
+
+uint32_t qemu_seccomp_get_opts(void)
+{
+    return seccomp_opts;
+}
+
 int parse_sandbox(void *opaque, QemuOpts *opts, Error **errp)
 {
     if (qemu_opt_get_bool(opts, "enable", false)) {
-        uint32_t seccomp_opts = QEMU_SECCOMP_SET_DEFAULT
-                | QEMU_SECCOMP_SET_OBSOLETE;
         const char *value = NULL;
+        seccomp_opts = QEMU_SECCOMP_SET_DEFAULT | QEMU_SECCOMP_SET_OBSOLETE;
 
         value = qemu_opt_get(opts, "obsolete");
         if (value) {
diff --git a/system/vl.c b/system/vl.c
index 7252100..b76881e 100644
--- a/system/vl.c
+++ b/system/vl.c
@@ -76,6 +76,7 @@
 #include "hw/block/block.h"
 #include "hw/i386/x86.h"
 #include "hw/i386/pc.h"
+#include "migration/blocker.h"
 #include "migration/cpr.h"
 #include "migration/misc.h"
 #include "migration/snapshot.h"
@@ -2493,6 +2494,11 @@ static void qemu_process_early_options(void)
     QemuOptsList *olist = qemu_find_opts_err("sandbox", NULL);
     if (olist) {
         qemu_opts_foreach(olist, parse_sandbox, NULL, &error_fatal);
+        if (qemu_seccomp_get_opts() & QEMU_SECCOMP_SET_SPAWN) {
+            Error *blocker = NULL;
+            error_setg(&blocker, "-sandbox denies exec for cpr-exec");
+            migrate_add_blocker_mode(&blocker, MIG_MODE_CPR_EXEC, 
&error_fatal);
+        }
     }
 #endif
 
-- 
1.8.3.1