On Tue, Mar 21, 2017 at 07:37:12PM +0300, Dmitry Safonov wrote: ... > diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c > index d6b784a5520d..d3d4d9abcaf8 100644 > --- a/arch/x86/kernel/process_64.c > +++ b/arch/x86/kernel/process_64.c > @@ -519,8 +519,14 @@ void set_personality_ia32(bool x32) > if (current->mm) > current->mm->context.ia32_compat = TIF_X32; > current->personality &= ~READ_IMPLIES_EXEC; > - /* in_compat_syscall() uses the presence of the x32 > - syscall bit flag to determine compat status */ > + /* > + * in_compat_syscall() uses the presence of the x32 > + * syscall bit flag to determine compat status. > + * On the bitness of syscall relies x86 mmap() code, > + * so set x32 syscall bit right here to make > + * in_compat_syscall() work during exec(). > + */ > + task_pt_regs(current)->orig_ax |= __X32_SYSCALL_BIT; > current->thread.status &= ~TS_COMPAT;
Hi! I must admit I didn't follow close the overall series (so can't comment much here :) but I have a slightly unrelated question -- is there a way to figure out if task is running in x32 mode say with some ptrace or procfs sign?
