Red Hat Bugzilla – Bug 53693
System crash kernel hang sending data to socket as normal user
Last modified: 2007-04-18 12:37:08 EDT
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User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 5.0)
Description of problem:
While testing a java server, I wrote a small C program to send data out to
a socket. I created a bug, which meant a large amount of data was pushed
in one write, the data itself didn't exist (pointer error).
The result, which is easily replicated, is a complete system crash, even
though the program itself is not running as root. Possible exploit?
Everything stops; network, video, keyboard, disk. No logs are generated so
far as I can tell.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Download the tarball from the URL I supplied above.
2. Either build the program, or run the included version.
3. Watch everything stop :-)
Actual Results: System crash.
Expected Results: System running :-) Program should send data out to
socket. Expected a segfault due to bug.
You don't mention which kernel version or rpm you are using.
Nevertheless can you try to reproduce this with our latest
There was a similar bug like this at one point, and it may be
present in the kernel which shipped in 7.1
Ok, this is the stock install of RH 7.1. on various hardware (same results on
each). No changes to the Kernel (normal kernel, not Enterprise or SMP). Apart
from the Ximian desktop, the install is standard in each case. I'll download
the errata rpms to test (will take a while, I'm on a modem!)
Please try updating to the errata release first. You can use up2date
to do so.