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Date: Wed, 31 Mar 2021 14:52:18 -0700
From: Yury Norov <yury.norov@gmail.com>
To: Mike Rapoport <rppt@kernel.org>
Subject: Re: [PATCH] memfd_secret: use unsigned int rather than long as
 syscall flags type
Message-ID: <20210331215218.GA3437@yury-ThinkPad>
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CC: Andrew Morton <akpm@linux-foundation.org>, Alexander Viro <viro@zeniv.linux.org.uk>, Andy Lutomirski <luto@kernel.org>, Arnd Bergmann <arnd@arndb.de>, Borislav Petkov <bp@alien8.de>, Catalin Marinas <catalin.marinas@arm.com>, Christopher Lameter <cl@linux.com>, Dave Hansen <dave.hansen@linux.intel.com>, David Hildenbrand <david@redhat.com>, Elena Reshetova <elena.reshetova@intel.com>, "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>, James Bottomley <jejb@linux.ibm.com>, "Kirill A. Shutemov" <kirill@shutemov.name>, Matthew Wilcox <willy@infradead.org>, Matthew Garrett <mjg59@srcf.ucam.org>, Mark Rutland <mark.rutland@arm.com>, Michal Hocko <mhocko@suse.com>, Mike Rapoport <rppt@linux.ibm.com>, Michael Kerrisk <mtk.manpages@gmail.com>, Palmer Dabbelt <palmer@dabbelt.com>, Paul Walmsley <paul.walmsley@sifive.com>, Peter Zijlstra <peterz@infradead.org>, "Rafael J. Wysocki" <rjw@rjwysocki.net>, Rick Edgecombe <rick.p.edgecombe@intel.com>, Roman Gushchin <guro@fb.com>,
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On Wed, Mar 31, 2021 at 05:23:45PM +0300, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@linux.ibm.com>
> 
> Yuri Norov says:
> 
>   If parameter size is the same for native and compat ABIs, we may
>   wire a syscall made by compat client to native handler. This is
>   true for unsigned int, but not true for unsigned long or pointer.
> 
>   That's why I suggest using unsigned int and so avoid creating compat
>   entry point.
> 
> Use unsigned int as the type of the flags parameter in memfd_secret()
> system call.
> 
> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>

Acked-by: Yury Norov <yury.norov@gmail.com>
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