On Wed, Jun 14, 2017 at 06:12:03PM -0700, Thomas Garnier wrote: > Ensure the address limit is a user-mode segment before returning to > user-mode. Otherwise a process can corrupt kernel-mode memory and > elevate privileges [1]. > > The set_fs function sets the TIF_SETFS flag to force a slow path on > return. In the slow path, the address limit is checked to be USER_DS if > needed. > > [1] https://bugs.chromium.org/p/project-zero/issues/detail?id=990 > > Signed-off-by: Thomas Garnier <thgarnie@xxxxxxxxxx> > --- > v10 redesigns the change to use work flags on set_fs as recommended by > Linus and agreed by others. > > Based on next-20170609 > --- > arch/arm64/include/asm/thread_info.h | 4 +++- > arch/arm64/include/asm/uaccess.h | 3 +++ > arch/arm64/kernel/signal.c | 5 +++++ > 3 files changed, 11 insertions(+), 1 deletion(-) For arm64: Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
