segv analyzer does not notice stack pointer leaving stack VMA

Bug #531672 reported by Kees Cook
This bug affects 1 person
Affects Status Importance Assigned to Milestone
apport (Ubuntu)
Fix Released
Kees Cook
Fix Released
Kees Cook

Bug Description

Binary package hint: apport

Program terminated with signal 11, Segmentation fault.
#0 0x00000000004004e0 in again ()
(gdb) info reg pc
pc: 0x4004e0
(gdb) x/1i $pc
0x4004e0 <again+28>: callq 0x4004c4 <again>
(gdb) info reg rsp
rsp 0x7fff95b34000 0x7fff95b34000

In the case that rsp is outside the stack VMA, "call" will fail. "push", and "pop" were already checked, but not "call" or "ret".

Kees Cook (kees)
Changed in apport (Ubuntu Lucid):
importance: Undecided → Low
assignee: nobody → Kees Cook (kees)
milestone: none → ubuntu-10.04-beta-1
status: New → Fix Committed
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package apport - 1.12.1-0ubuntu3

apport (1.12.1-0ubuntu3) lucid; urgency=low

  * data/general-hooks/ add "call" and "ret" to list of insns
    that check the stack pointer for VMA sanity (LP: #531672), backport of
    upstream commit 1715.
 -- Kees Cook <email address hidden> Wed, 03 Mar 2010 18:07:46 -0800

Changed in apport (Ubuntu Lucid):
status: Fix Committed → Fix Released
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