[Qemu-devel] [PATCH v2] seccomp: add cacheflush to whitelist

[Andrew Jones <drjones@redhat.com>]

cacheflush is an arm-specific syscall that qemu built for arm
uses. Add it to the whitelist, but only if we're linking with
a recent enough libseccomp.

Signed-off-by: Andrew Jones <drjones@redhat.com>
---
v2: only add cacheflush if libseccomp supports it

 qemu-seccomp.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/qemu-seccomp.c b/qemu-seccomp.c
index 80d034a8d5190..e76097e958779 100644
--- a/qemu-seccomp.c
+++ b/qemu-seccomp.c
@@ -16,6 +16,10 @@
 #include <seccomp.h>
 #include "sysemu/seccomp.h"
 
+#if SCMP_VER_MAJOR >= 2 && SCMP_VER_MINOR >= 2 && SCMP_VER_MICRO >= 3
+#define HAVE_CACHEFLUSH
+#endif
+
 struct QemuSeccompSyscall {
     int32_t num;
     uint8_t priority;
@@ -238,7 +242,10 @@ static const struct QemuSeccompSyscall seccomp_whitelist[] = {
     { SCMP_SYS(inotify_init1), 240 },
     { SCMP_SYS(inotify_add_watch), 240 },
     { SCMP_SYS(mbind), 240 },
-    { SCMP_SYS(memfd_create), 240 }
+    { SCMP_SYS(memfd_create), 240 },
+#ifdef HAVE_CACHEFLUSH
+    { SCMP_SYS(cacheflush), 240 },
+#endif
 };
 
 int seccomp_start(void)
-- 
1.8.3.1