diff --git a/sortix/elf.cpp b/sortix/elf.cpp
index ac00d3eb..998077db 100644
--- a/sortix/elf.cpp
+++ b/sortix/elf.cpp
@@ -36,6 +36,25 @@ namespace Sortix
 {
 	namespace ELF
 	{
+		int ToProgramSectionType(int flags)
+		{
+			switch ( flags & (PF_X | PF_R | PF_W) )
+			{
+				case 0:
+					return SEG_NONE;
+				case PF_X:
+				case PF_X | PF_R:
+				case PF_X | PF_W:
+				case PF_X | PF_R | PF_W:
+					return SEG_TEXT;
+				case PF_R:
+				case PF_W:
+				case PF_R | PF_W:
+				default:
+					return SEG_DATA;
+			}
+		}
+
 		addr_t Construct32(Process* process, const void* file, size_t filelen)
 		{
 			if ( filelen < sizeof(Header32) ) { return 0; }
@@ -83,7 +102,7 @@ namespace Sortix
 				if ( segment == NULL ) { return 0; }
 				segment->position = mapto;
 				segment->size = Page::AlignUp(mapbytes);
-				segment->type = SEG_DATA; // TODO: BUG
+				segment->type = ToProgramSectionType(pht->flags);
 
 				if ( segment->Intersects(process->segments) )
 				{
@@ -163,7 +182,7 @@ namespace Sortix
 				if ( segment == NULL ) { return 0; }
 				segment->position = mapto;
 				segment->size = Page::AlignUp(mapbytes);
-				segment->type = SEG_DATA; // TODO: BUG
+				segment->type = ToProgramSectionType(pht->flags);
 
 				if ( segment->Intersects(process->segments) )
 				{
diff --git a/sortix/elf.h b/sortix/elf.h
index b5c8c515..8c6c2ab2 100644
--- a/sortix/elf.h
+++ b/sortix/elf.h
@@ -162,6 +162,10 @@ namespace Sortix
 		const uint32_t PT_LOPROC = 0x70000000;
 		const uint32_t PT_HIPROC = 0x7FFFFFFF;
 
+		const uint32_t PF_X = (1<<0);
+		const uint32_t PF_W = (1<<1);
+		const uint32_t PF_R = (1<<2);
+
 		// Reads the elf file into the current address space and returns the
 		// entry address of the program, or 0 upon failure.
 		addr_t Construct(Process* process, const void* file, size_t filelen);
diff --git a/sortix/process.h b/sortix/process.h
index f45ed068..24f3237a 100644
--- a/sortix/process.h
+++ b/sortix/process.h
@@ -34,10 +34,11 @@ namespace Sortix
 	struct ProcessSegment;
 
 	const size_t DEFAULT_STACK_SIZE = 64*1024;
-	const int SEG_TEXT = 0;
-	const int SEG_DATA = 1;
-	const int SEG_STACK = 2;
-	const int SEG_OTHER = 3;
+	const int SEG_NONE = 0;
+	const int SEG_TEXT = 1;
+	const int SEG_DATA = 2;
+	const int SEG_STACK = 3;
+	const int SEG_OTHER = 4;
 
 	struct ProcessSegment
 	{