Bug#733551: Sanitation of CPU-state when switching from virtual-8086 mode to other task incomplete

2014-01-07 Thread halfdog
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Ben Hutchings wrote: On Fri, 2014-01-03 at 23:20 +, halfdog wrote: Here is some more information from my latest tests: * Although first observed with virtual-8086 mode, the bug is not specific to virtual-8086 mode, it can be triggered with

Bug#733551: Sanitation of CPU-state when switching from virtual-8086 mode to other task incomplete

2014-01-05 Thread Ben Hutchings
On Fri, 2014-01-03 at 23:20 +, halfdog wrote: Here is some more information from my latest tests: * Although first observed with virtual-8086 mode, the bug is not specific to virtual-8086 mode, it can be triggered with normal x86 userspace code also, even with better reproducibility.

Bug#733551: Sanitation of CPU-state when switching from virtual-8086 mode to other task incomplete

2014-01-03 Thread halfdog
Here is some more information from my latest tests: * Although first observed with virtual-8086 mode, the bug is not specific to virtual-8086 mode, it can be triggered with normal x86 userspace code also, even with better reproducibility. * It seems, that when changing the FPU control word with

Bug#733551: Sanitation of CPU-state when switching from virtual-8086 mode to other task incomplete

2013-12-29 Thread halfdog
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Package: linux-image-3.11-2-486 Version: 3.11.10-1 Tags: security When executing code in virtual-8086 mode via vm86 syscall, kernel seems to perform incomplete CPU state sanitation when switching tasks, thus causing OOPSes or complete machine lockup.

Bug#733551: Sanitation of CPU-state when switching from virtual-8086 mode to other task incomplete

2013-12-29 Thread Bastian Blank
Control: tag -1 moreinfo On Sun, Dec 29, 2013 at 09:12:35PM +, halfdog wrote: When executing code in virtual-8086 mode via vm86 syscall, kernel seems to perform incomplete CPU state sanitation when switching tasks, thus causing OOPSes or complete machine lockup. You only showed exceptions

Processed: Re: Bug#733551: Sanitation of CPU-state when switching from virtual-8086 mode to other task incomplete

2013-12-29 Thread Debian Bug Tracking System
Processing control commands: tag -1 moreinfo Bug #733551 [linux-image-3.11-2-486] Sanitation of CPU-state when switching from virtual-8086 mode to other task incomplete Added tag(s) moreinfo. -- 733551: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=733551 Debian Bug Tracking System Contact

Processed: Re: Bug#733551: Sanitation of CPU-state when switching from virtual-8086 mode to other task incomplete

2013-12-29 Thread Debian Bug Tracking System
Processing control commands: reassign -1 src:linux 3.11.10-1 Bug #733551 [linux-image-3.11-2-486] Sanitation of CPU-state when switching from virtual-8086 mode to other task incomplete Bug reassigned from package 'linux-image-3.11-2-486' to 'src:linux'. No longer marked as found in versions

Bug#733551: Sanitation of CPU-state when switching from virtual-8086 mode to other task incomplete

2013-12-29 Thread Ben Hutchings
Control: reassign -1 src:linux 3.11.10-1 Control: severity -1 important Control: tag -1 moreinfo On Sun, 2013-12-29 at 21:12 +, halfdog wrote: Package: linux-image-3.11-2-486 Version: 3.11.10-1 Tags: security When executing code in virtual-8086 mode via vm86 syscall, kernel seems to

Bug#733551: Sanitation of CPU-state when switching from virtual-8086 mode to other task incomplete

2013-12-29 Thread halfdog
Bastian Blank wrote: Control: tag -1 moreinfo On Sun, Dec 29, 2013 at 09:12:35PM +, halfdog wrote: When executing code in virtual-8086 mode via vm86 syscall, kernel seems to perform incomplete CPU state sanitation when switching tasks, thus causing OOPSes or complete machine lockup.