Linux ia64 kernels have a floating point leak because the context switch code checks just the psr.mfh bit and doesn't look at who the FPH owner is. This allows a malicious program to set the MFH bit and look at the registers of another possibly sensitive process. Patch available and committed: http://lia64.bkbits.net:8080/to-linus-2.5/cset@1.1726.29.7 CAN-2004-0565 Affects: 2.1AS(ia64) 2.1AW
The referenced patch doesn't seem to exist (possibly merged out of bk or somesuch). Got another reference?
I don't have the exact link to the 2.4 changeset, but here is the 2.6 changeset to help find it. http://linux.bkbits.net:8080/linux-2.6/cset@40bfc1cbJnl_19Ig3vzEM08521rh0w
I found the 2.4 changeset, it's at http://linux.bkbits.net:8080/linux-2.4/cset@1.1425.3.1
An errata has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2004-504.html