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Message-ID: <77fab6ea-0bbf-d68b-a38e-3e22d1ae6093@linux.intel.com>
Date: Wed, 28 Mar 2018 15:55:24 -0700
From: Dave Hansen <dave.hansen@...ux.intel.com>
To: Alexander Popov <alex.popov@...ux.com>,
kernel-hardening@...ts.openwall.com, Kees Cook <keescook@...omium.org>,
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linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC v10 2/6] x86/entry: Add STACKLEAK erasing the kernel
stack at the end of syscalls
On 03/28/2018 12:57 PM, Alexander Popov wrote:
> +.macro ERASE_KSTACK
> +#ifdef CONFIG_GCC_PLUGIN_STACKLEAK
> + PUSH_AND_CLEAR_REGS
> + call erase_kstack
> + POP_REGS
> +#endif
> +.endm
Thanks again for the hard work to trim down the complexity of the
assembly. I noticed the 64-bit version saves/restores registers while
the 32-bit version doesn't. What's the reasoning there?
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