Red Hat Bugzilla – Bug 188618
concurrent access to /dev/urandom can output same value on smp kernels
Last modified: 2007-11-30 17:07:09 EST
Description of problem:
/dev/urandom can return duplicate values when two processors read from it at
the same time.
Version-Release number of selected component (if applicable):
Having 2 processes running on 2 processors accessing the /dev/urandom file.
The same values are read from the read() call on /dev/urandom.
Different values from the read() calls.
This bug has been fixed in kernel 2.6.10. When will this be introduced in the
2.4.x kernels from RedHat ?
Do a search on 'concurrent acces /dev/urandom' and you should find the bug
details and the bug fixes related to it.
This bug is filed against RHEL 3, which is in maintenance phase.
During the maintenance phase, only security errata and select mission
critical bug fixes will be released for enterprise products. Since
this bug does not meet that criteria, it is now being closed.
For more information of the RHEL errata support policy, please visit:
If you feel this bug is indeed mission critical, please contact your
support representative. You may be asked to provide detailed
information on how this bug is affecting you.