Uploaded to -proposed...
** Description changed:
+ IMPACT: stack protections are weakened due to strcpy function being able to
write the stack guard (since it does not start with a zero byte).
+ ADDRESSED: correctly implement leading zero, as done in Karmic.
+ DISCUSSION: regression potential is low, since the patch is isolated and well
tested.
+
+ TEST CASE:
$ bzr branch lp:~ubuntu-bugcontrol/qa-regression-testing/master
qa-regression-testing
$ cd qa-regression-testing/scripts
$ ./test-glibc-security.py -v
Build helper tools ... (9.10) ok
glibc heap protection ... ok
sprintf not pre-truncated with -D_FORTIFY_SOURCE=2 ... ok
glibc pointer obfuscation ... ok
Password hashes ... (sha512) ok
Stack guard exists ... ok
Stack guard leads with zero byte ... FAIL
Stack guard is randomized ... ok
======================================================================
FAIL: Stack guard leads with zero byte
----------------------------------------------------------------------
Traceback (most recent call last):
File "./test-glibc-security.py", line 170, in test_81_stack_guard_leads_zero
- self.assertEqual(one.endswith('00\n'), expected, one)
- AssertionError: 0x6f33dd6a30051c1
-
+ self.assertEqual(one.startswith('00 '), expected, one)
+ AssertionError: 62 55 59 69 cd 20 39 80
----------------------------------------------------------------------
Ran 8 tests in 0.145s
FAILED (failures=1)
+ expected outcome: 0 failures.
+
ProblemType: Bug
Architecture: amd64
Date: Thu Aug 13 13:59:02 2009
Dependencies:
- findutils 4.4.2-1
- gcc-4.4-base 4.4.1-1ubuntu3
- libc6 2.10.1-0ubuntu6
- libgcc1 1:4.4.1-1ubuntu3
+ findutils 4.4.2-1
+ gcc-4.4-base 4.4.1-1ubuntu3
+ libc6 2.10.1-0ubuntu6
+ libgcc1 1:4.4.1-1ubuntu3
DistroRelease: Ubuntu 9.10
Package: libc6 2.10.1-0ubuntu6
ProcEnviron:
- LANGUAGE=en_US.UTF-8
- PATH=(custom, user)
- LANG=en_US.UTF-8
- SHELL=/bin/bash
+ LANGUAGE=en_US.UTF-8
+ PATH=(custom, user)
+ LANG=en_US.UTF-8
+ SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-5.24-generic
SourcePackage: eglibc
Uname: Linux 2.6.31-5-generic x86_64
** Attachment added: "glibc_2.9-4ubuntu6.1.debdiff"
http://launchpadlibrarian.net/30804998/glibc_2.9-4ubuntu6.1.debdiff
--
stack protector guard value does not lead with a NULL byte
https://bugs.launchpad.net/bugs/413278
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