Re: [PATCH] x86/asm/64: do not clear high 32 bits of syscall number when CONFIG_X86_X32=y

From: Eugene Syromyatnikov
Date: Thu Sep 14 2017 - 15:41:09 EST

On Wed, Sep 13, 2017 at 4:49 PM, Oleg Nesterov <oleg@xxxxxxxxxx> wrote:
> IOW, why do we want to silently ignore the upper bits in $rax ?

By the way, they are ignored elsewhere, in audit[1] or seccomp[2], for example.

[1] include/linux/audit.h
[2] include/uapi/linux/seccomp.h, definition of struct seccomp_data

Eugene Syromyatnikov