On Fri, Nov 30, 2012 at 10:55:01AM -0800, Greg Kroah-Hartman wrote: > 3.4-stable review patch. If anyone has any objections, please let me know. > > ------------------ > > From: Robert Richter <robert.rich...@amd.com> > > commit 1022623842cb72ee4d0dbf02f6937f38c92c3f41 upstream. > > In 32 bit the stack address provided by kernel_stack_pointer() may > point to an invalid range causing NULL pointer access or page faults > while in NMI (see trace below). This happens if called in softirq > context and if the stack is empty. The address at ®s->sp is then > out of range. > > Fixing this by checking if regs and ®s->sp are in the same stack > context. Otherwise return the previous stack pointer stored in struct > thread_info. If that address is invalid too, return address of regs. >
This also makes latest 3.4.y build fail with oprofile on i386, needs also EXPORT_SYMBOL for kernel_stack_pointer (commit cb57a2b4cff7edf2a4e32c0163200e9434807e0a) -- []'s Herton -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
