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Bug 163451 - bad:Kernel breaks on pppd start during dial-up.
Summary: bad:Kernel breaks on pppd start during dial-up.
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: 4
Hardware: i686
OS: Linux
Target Milestone: ---
Assignee: Kernel Maintainer List
QA Contact: Brian Brock
Depends On:
TreeView+ depends on / blocked
Reported: 2005-07-17 04:25 UTC by Andrew Vitolins
Modified: 2007-11-30 22:11 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2005-08-04 05:11:13 UTC

Attachments (Terms of Use)

Description Andrew Vitolins 2005-07-17 04:25:10 UTC
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20050524 Fedora/1.0.4-4 Firefox/1.0.4

Description of problem:
I have an Lucent tech modem. On pppd start the system locks up using the default kernel with my modem driver compiled against it.

   I am now using kernel- from without this problem.
     I also had the same problem while using FedoraCore3 with kernel- vanilla from
     The following day they released Patch- which resolved my problem.

   TEXT from changelog-
	[PATCH] CAN-2005-0384: Remote Linux DoS on ppp servers
	Martin Schulze writes:
	> Ben Martel and Stephen Blackheath have discovered a denial-of-service attack
	> that a client of pppd can make that can hang the server machine.  The bug is
	> in the Linux kernel 2.6 (tested on 2.6.9), but it looks like it also exists
	> in the 2.4 series.
	Yes, this is my bug. :(
	I would just do this instead:
	Signed-off-by: Chris Wright <>
	Signed-off-by: Greg Kroah-Hartman <>

	[PATCH] use strncpy in get_task_comm
	From: Prasanna Meda <>
	Set_task_comm uses strlcpy, so get_task_comm must use strncpy.
	Signed-Off-by: Prasanna Meda <>
	Signed-off-by: Andrew Morton <>
	Signed-off-by: Chris Wright <>
	Signed-off-by: Greg Kroah-Hartman <>


         the FC4 kernel must contain the same bug.
 I hope the info helps
rgds Andrew

Version-Release number of selected component (if applicable):
 2.6.12-1.1398_FC4-i686  & all previous.

How reproducible:

Steps to Reproduce:

Actual Results:  ppp negotiation starts,username & passwd are verified,then when pppd starts up the system locks up

Expected Results:  connect to my isp

Additional info:

Comment 1 Dave Jones 2005-08-04 05:11:13 UTC
the bug above must be unrelated, as the patch is included in subsequent kernels,
including the 2.6.12 on which the FC4 kernel is based.  More likely you've hit a
bug in your out-of-tree driver.  I suggest taking it up with the vendor of that

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