On Tue, Mar 17, 2015 at 02:52:24PM +0100, Denys Vlasenko wrote: > Without this change, it is still not possible to get rid of > PER_CPU_VAR(old_rsp) usage in switch_to: if preemption happens > while we did not fetch PER_CPU_VAR(old_rsp) and stored it in pt_regs->sp, > PER_CPU_VAR(old_rsp) gets corrupted by other task's user sp. > > Signed-off-by: Denys Vlasenko <[email protected]> > CC: Linus Torvalds <[email protected]> > CC: Steven Rostedt <[email protected]> > CC: Ingo Molnar <[email protected]> > CC: Borislav Petkov <[email protected]> > CC: "H. Peter Anvin" <[email protected]> > CC: Andy Lutomirski <[email protected]> > CC: Oleg Nesterov <[email protected]> > CC: Frederic Weisbecker <[email protected]> > CC: Alexei Starovoitov <[email protected]> > CC: Will Drewry <[email protected]> > CC: Kees Cook <[email protected]> > CC: [email protected] > CC: [email protected] > --- > > Changes since v1: don't try to be clever and use CLBR_RAX > > arch/x86/kernel/entry_64.S | 10 +++++----- > 1 file changed, 5 insertions(+), 5 deletions(-)
Reported-and-tested-by: Borislav Petkov <[email protected]> Thanks Denys! -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. -- -- 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/
