[Help-smalltalk] patch to sigsev

[Frederik]

Hi,

Mandriva's gnu smalltalk package, includes the following old patch. I
suppose it is related to some problems caused when using the PaX
kernel patch
( http://pax.grsecurity.net/ ). I'm currently in the process of
updating the gnu small talk package in Mandriva. Do you think this
patch is still useful and correct? If so, is there any interest to add
it upstream?



--- smalltalk-2.1.8/sigsegv/src/heur-ac.h.orig  Fri Jul 16 11:54:44 2004
+++ smalltalk-2.1.8/sigsegv/src/heur-ac.h       Fri Jul 16 12:10:58 2004
@@ -32,8 +32,11 @@
      stack_top = vma.end - 1;
      return 0;
    }
-  else
-    return -1;
+  else {
+    extern void *__libc_stack_end;
+    stack_top = __libc_stack_end;
+    return 0;
+  }
}

#define IS_STACK_OVERFLOW \
--- smalltalk-2.1.8/sigsegv/src/stackvma-linux.c.orig   Fri Dec 19 17:01:08 2003
+++ smalltalk-2.1.8/sigsegv/src/stackvma-linux.c        Fri Jul 16 12:03:31 2004
@@ -42,7 +42,8 @@
        break;
      while (c = getc (fp), c != EOF && c != '\n')
        continue;
-      if (address >= start && address <= end - 1)
+      if (address >= start && address <= end - 1 &&
+         (start != end /* ignore maps hidden by PaX */))
        {
          vma->start = start;
          vma->end = end;


--
Frederik