Trivial SELinux awareness. Enable with --enable-selinux.

Avoids AVC warnings when allocating executable memory by first checking
if the current process has permission to do so.

1 files changed, 19 insertions, 3 deletions

diff --git a/src/mesa/main/execmem.c b/src/mesa/main/execmem.c
index 40f66d7da2..b40a2de8fa 100644
--- a/src/mesa/main/execmem.c
+++ b/src/mesa/main/execmem.c
@@ -47,6 +47,10 @@
 #include <sys/mman.h>
 #include "mm.h"
 
+#ifdef MESA_SELINUX
+#include <selinux/selinux.h>
+#endif
+
 #define EXEC_HEAP_SIZE (10*1024*1024)
 
 _glthread_DECLARE_STATIC_MUTEX(exec_mutex);
@@ -55,9 +59,17 @@ static struct mem_block *exec_heap = NULL;
 static unsigned char *exec_mem = NULL;
 
 
-static void
+static int
 init_heap(void)
 {
+#ifdef MESA_SELINUX
+   if (is_selinux_enabled()) {
+      if (!security_get_boolean_active("allow_execmem") ||
+	  !security_get_boolean_pending("allow_execmem"))
+         return 0;
+   }
+#endif
+
    if (!exec_heap)
       exec_heap = mmInit( 0, EXEC_HEAP_SIZE );
    
@@ -65,6 +77,8 @@ init_heap(void)
       exec_mem = (unsigned char *) mmap(0, EXEC_HEAP_SIZE, 
 					PROT_EXEC | PROT_READ | PROT_WRITE, 
 					MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+
+   return (exec_mem != NULL);
 }
 
 
@@ -76,7 +90,8 @@ _mesa_exec_malloc(GLuint size)
 
    _glthread_LOCK_MUTEX(exec_mutex);
 
-   init_heap();
+   if (!init_heap())
+      goto bail;
 
    if (exec_heap) {
       size = (size + 31) & ~31;
@@ -87,7 +102,8 @@ _mesa_exec_malloc(GLuint size)
       addr = exec_mem + block->ofs;
    else 
       _mesa_printf("_mesa_exec_malloc failed\n");
-   
+
+bail:
    _glthread_UNLOCK_MUTEX(exec_mutex);
    
    return addr;