linux-kernel - Re: [PATCH v30 12/20] x86/sgx: Add a page reclaimer

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200522071553.GA24377@linux.intel.com>
Date:   Fri, 22 May 2020 00:15:53 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org, akpm@...ux-foundation.org,
        dave.hansen@...el.com, nhorman@...hat.com, npmccallum@...hat.com,
        haitao.huang@...el.com, andriy.shevchenko@...ux.intel.com,
        tglx@...utronix.de, kai.svahn@...el.com, bp@...en8.de,
        josh@...htriplett.org, luto@...nel.org, kai.huang@...el.com,
        rientjes@...gle.com, cedric.xing@...el.com, puiterwijk@...hat.com,
        linux-mm@...ck.org, Jethro Beekman <jethro@...tanix.com>,
        Jordan Hand <jorhand@...ux.microsoft.com>,
        Chunyang Hui <sanqian.hcy@...fin.com>,
        Seth Moore <sethmo@...gle.com>
Subject: Re: [PATCH v30 12/20] x86/sgx: Add a page reclaimer

On Fri, May 15, 2020 at 03:44:02AM +0300, Jarkko Sakkinen wrote:
> +static void sgx_reclaimer_write(struct sgx_epc_page *epc_page,
> +				struct sgx_backing *backing)
> +{
> +	struct sgx_encl_page *encl_page = epc_page->owner;
> +	struct sgx_encl *encl = encl_page->encl;
> +	struct sgx_backing secs_backing;
> +	int ret;
> +
> +	mutex_lock(&encl->lock);
> +
> +	if (atomic_read(&encl->flags) & SGX_ENCL_DEAD) {
> +		ret = __eremove(sgx_epc_addr(epc_page));
> +		ENCLS_WARN(ret, "EREMOVE returned %d\n");

The " returned %d\n" is unnecessary and leads to a bad message, ENCLS_WARN
handles the message and formatting, i.e. this should simply be:

		ENCLS_WARN(ret, "EREMOVE");

> +	} else {
> +		sgx_encl_ewb(epc_page, backing);
> +	}
> +
> +	encl_page->epc_page = NULL;
> +	encl->secs_child_cnt--;