[tkreuzer] 37320: Make sure we don't parse instructions beyond the eh_frame section. Looks like in some cases the last Fde isn't terminated with a 0 Length field.

Author: tkreuzer
Date: Wed Nov 12 15:30:16 2008
New Revision: 37320

URL: http://svn.reactos.org/svn/reactos?rev=37320&view=rev
Log:
Make sure we don't parse instructions beyond the eh_frame section. Looks like in some cases the last Fde isn't terminated with a 0 Length field.

Modified:
    branches/ros-amd64-bringup/reactos/tools/rsym/rsym64.c

Modified: branches/ros-amd64-bringup/reactos/tools/rsym/rsym64.c
URL: http://svn.reactos.org/svn/reactos/branches/ros-amd64-bringup/reactos/tools/...
==============================================================================
--- branches/ros-amd64-bringup/reactos/tools/rsym/rsym64.c [iso-8859-1] (original)
+++ branches/ros-amd64-bringup/reactos/tools/rsym/rsym64.c [iso-8859-1] Wed Nov 12 15:30:16 2008
@@ -87,7 +87,7 @@
     pc += Cie->AugLength;
     Cie->Instructions = pc;

-    return Cie->Length;
+    return Cie->Length + 4;
 }

unsigned long
@@ -103,7 +103,7 @@
     Fde->AugData = pc;
     Fde->Instructions = Fde->AugData + Fde->AugLength;

-    return Fde->Length;
+    return Fde->Length + 4;
 }

unsigned long
@@ -214,7 +214,6 @@
     }

State->FramePtrDiff = State->FramePtr - PrevFramePtr;
-    
 //printf("@%p: code=%x, Loc=%lx, offset=%lx, reg=0x%lx:%s\n", pc, code, State->Location, State->Offset, State->Reg, regnames_64[State->Reg]);
     return Length;
 }
@@ -371,7 +370,7 @@
 {
     DW2CIEFDE *p;
     DW2FDE Fde;
-    char *pInst;
+    char *pInst, *pmax;
     DW2CFSTATE State;

File->cFuncs = 0;
@@ -380,7 +379,8 @@
     State.FramePtr = 0;

p = GetSectionPointer(File, File->eh_frame.idx);
-    for (; p->Length; p = NextCIE(p))
+    pmax = (char*)p + File->eh_frame.psh->Misc.VirtualSize;
+    for (; p->Length && (char*)p < pmax; p = NextCIE(p))
     {
         /* Is this an FDE? */
         if (p->CiePointer != 0)
@@ -421,6 +421,7 @@
     ULONG cbSize;
     PIMAGE_SECTION_HEADER pshp, pshx;
     ULONG FileAlignment;
+    char *pmax;

FileAlignment = File->OptionalHeader->FileAlignment;

@@ -463,7 +464,9 @@
     Offset = File->eh_frame.psh->VirtualAddress;
     xdata_va = pshx->VirtualAddress;
     xdata_p = File->xdata.p;
-    for (p = eh_frame; p->Length; p = NextCIE(p))
+    pmax = (char*)eh_frame + File->eh_frame.psh->Misc.VirtualSize - 100;
+
+    for (p = eh_frame; p->Length && (char*)p < pmax; p = NextCIE(p))
     {
         /* Is this an FDE? */
         if (p->CiePointer != 0)