linux-kernel - Re: [PATCH v12 16/22] selftests/vm: fix an assertion in test_pkey_alloc

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: <98204562-7c91-23f0-101b-508954020353@intel.com>
Date:   Fri, 16 Mar 2018 15:28:19 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Ram Pai <linuxram@...ibm.com>, shuahkh@....samsung.com,
        linux-kselftest@...r.kernel.org
Cc:     mpe@...erman.id.au, linuxppc-dev@...ts.ozlabs.org,
        linux-mm@...ck.org, x86@...nel.org, linux-arch@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        mingo@...hat.com, akpm@...ux-foundation.org,
        benh@...nel.crashing.org, paulus@...ba.org,
        khandual@...ux.vnet.ibm.com, aneesh.kumar@...ux.vnet.ibm.com,
        bsingharora@...il.com, hbabu@...ibm.com, mhocko@...nel.org,
        bauerman@...ux.vnet.ibm.com, ebiederm@...ssion.com, arnd@...db.de
Subject: Re: [PATCH v12 16/22] selftests/vm: fix an assertion in
 test_pkey_alloc_exhaust()

On 02/21/2018 05:55 PM, Ram Pai wrote:
> +static inline int arch_reserved_keys(void)
> +{
> +#if defined(__i386__) || defined(__x86_64__) /* arch */
> +	return NR_RESERVED_PKEYS;
> +#elif __powerpc64__ /* arch */
> +	if (sysconf(_SC_PAGESIZE) == 4096)
> +		return NR_RESERVED_PKEYS_4K;
> +	else
> +		return NR_RESERVED_PKEYS_64K;
> +#else /* arch */
> +	NOT SUPPORTED
> +#endif /* arch */
> +}

Yeah, this is hideous.

Please either do it in one header:

#ifdef x86..
static inline int arch_reserved_keys(void)
{
}
...
#elif ppc
static inline int arch_reserved_keys(void)
{
}
...
#else
#error
#endif

Or in multiple:

#ifdef x86..
#include <pkey_x86.h>
#elif ppc
#include <pkey_ppc.h>
#else
#error
#endif