backquote expansion bug in /bin/sh ( fix included )

Wed Feb 4 15:55:42 PST 2004

On 04.02.2004, at 21:42, Andrew Atrens wrote:
Here's a patch to sh, which fixes this -

"/usr/bin/cvs" -z3 -Q diff -N -b -B -kk  -r 1.3 -r 1.3.2.1 "expand.c"
Index: expand.c
===================================================================
RCS file: /usr/dfly/repo/src/bin/sh/expand.c,v
retrieving revision 1.3
retrieving revision 1.3.2.1
diff -b -B -r1.3 -r1.3.2.1
472c472
<       for (p--; lastc == '\n'; lastc = *--p)
---
      for ( ; *(dest-1) == '\n' ; )
It lacks some bounds checking. Under sucky circumstances both old and 
new version will eat back up the stack...

How about (didn't try tho):

while (*(dest - 1) == '\n' && dest - stackblock() > startloc)

cheers
  simon
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