fix bugs found in brk & add simple security checks on lx_free

[lunaix-os.git] / lunaix-os / kernel / k_main.c

diff --git a/lunaix-os/kernel/k_main.c b/lunaix-os/kernel/k_main.c
index b1fe4886184c7aa98c1b442cb924fc7751754920..565e5bc0b545af3c355d6eeec6d6ab692a1c042c 100644 (file)
--- a/lunaix-os/kernel/k_main.c
+++ b/lunaix-os/kernel/k_main.c
@@ -1,7 +1,9 @@
 #include <stdint.h>
 #include <lunaix/mm/vmm.h>
+#include <lunaix/mm/kalloc.h>
 #include <hal/cpu.h>
 #include <libc/stdio.h>
+#include <lunaix/spike.h>
 
 extern uint8_t __kernel_start;
 
@@ -19,5 +21,33 @@ _kernel_main()
     void* k_start = vmm_v2p(&__kernel_start);
     printf("The kernel's base address mapping: %p->%p\n", &__kernel_start, k_start);
 
-    // assert(0);
+    // test malloc & free
+    
+    uint32_t** arr = (uint32_t**) kmalloc(10 * sizeof(uint32_t*));
+    
+    for (size_t i = 0; i < 10; i++)
+    {
+        arr[i] = (uint32_t*) kmalloc((i + 1) * 2);
+    }
+
+
+    for (size_t i = 0; i < 10; i++)
+    {
+        kfree(arr[i]);
+    }
+
+    void* big_ = kmalloc(8192);
+    
+    // good free
+    kfree(arr);
+    kfree(big_);
+
+    uint8_t* bad1 = kmalloc(123);
+    void* bad2 = kmalloc(1);
+
+    *((uint32_t*)(bad1 - 4)) = 0xc2343312UL;
+
+    // bad free
+    kfree(bad1);
+    kfree(bad2 - 2);
 }
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