[Qemu-devel] [PULL 04/04] Add syscalls for -runas and -chroot to the seccomp sandbox

[Eduardo Otubo]

From: Namsun Ch'o <address@hidden>

The seccomp sandbox doesn't whitelist setuid, setgid, or setgroups, which are
needed for -runas to work. It also doesn't whitelist chroot, which is needed
for the -chroot option. Unfortunately, QEMU enables seccomp before it drops
privileges or chroots, so without these whitelisted, -runas and -chroot cause
QEMU to be killed with -sandbox on. This patch adds those syscalls.

Signed-off-by: Namsun Ch'o <address@hidden>
Acked-by: Eduardo Otubo <address@hidden>
---
 qemu-seccomp.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/qemu-seccomp.c b/qemu-seccomp.c
index a54d358..429b208 100644
--- a/qemu-seccomp.c
+++ b/qemu-seccomp.c
@@ -237,7 +237,12 @@ static const struct QemuSeccompSyscall seccomp_whitelist[] 
= {
     { SCMP_SYS(inotify_init1), 240 },
     { SCMP_SYS(inotify_add_watch), 240 },
     { SCMP_SYS(mbind), 240 },
-    { SCMP_SYS(cacheflush), 240 }
+    { SCMP_SYS(cacheflush), 240 },
+    { SCMP_SYS(mbind), 240 },
+    { SCMP_SYS(setuid), 240 },
+    { SCMP_SYS(setgid), 240 },
+    { SCMP_SYS(chroot), 240 },
+    { SCMP_SYS(setgroups), 240 }
 };
 
 int seccomp_start(void)
-- 
2.1.4