These patches add no execute support to PPC64. They prohibit executing code on the stack, or most any non-text segment for both user space, and kernel.
No execute is supported on Power4 processors and up. These processors support pages that have a no-execute permission bit. The patches include a base fixup from Anton Blanchard. This includes a fix for the wrong bit being used for no-exec and for read/write on the hardware PTEs. For distros that compile w/ pt_gnu_stacks, they depend on Ben Herrenschmidt's vDSO patches for signal trampoline. Without it, the application will hang on the first signal due to the return code being put on the signal context stack to return to the kernel on the completion of the signal handler. The changes should be in the latest BK tree. The patch is broken into two parts: 1/2: PPC64 no-exec support for user space: This will prohibit user space apps from executing in segments not marked as executable. The base support is in here as well. 2/2: PPC64 no-exec support for kernel space: This prohibits the kernel from executing non-text code. Thanks, Jake - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
