use SC_ALLOW_ARG_MASK to limit mmap protections

Restrict to PROT_(READ|WRITE|NONE), i.e. exclude PROT_EXEC

diff --git a/sandbox-seccomp-filter.c b/sandbox-seccomp-filter.c
index 7b44755cb6dc23bf52695d869cd5cf118d3fb970..840c5232bfefaabdbdd7e37dc4eec204490698e0 100644 (file)
--- a/sandbox-seccomp-filter.c
+++ b/sandbox-seccomp-filter.c
@@ -216,10 +216,10 @@ static const struct sock_filter preauth_insns[] = {
        SC_ALLOW(__NR_madvise),
 #endif
 #ifdef __NR_mmap
-       SC_ALLOW(__NR_mmap),
+       SC_ALLOW_ARG_MASK(__NR_mmap, 2, PROT_READ|PROT_WRITE|PROT_NONE),
 #endif
 #ifdef __NR_mmap2
-       SC_ALLOW(__NR_mmap2),
+       SC_ALLOW_ARG_MASK(__NR_mmap2, 2, PROT_READ|PROT_WRITE|PROT_NONE),
 #endif
 #ifdef __NR_mprotect
        SC_ALLOW_ARG_MASK(__NR_mprotect, 2, PROT_READ|PROT_WRITE|PROT_NONE),