linux-kernel - Re: [PATCH] compat: use sys_sendfile64() implementation for sendfile syscall

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Message-Id: <201203262045.16243.arnd@arndb.de>
Date:	Mon, 26 Mar 2012 20:45:15 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Chris Metcalf <cmetcalf@...era.com>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] compat: use sys_sendfile64() implementation for sendfile syscall

On Monday 26 March 2012, Chris Metcalf wrote:
> <asm-generic/unistd.h> was set up to use sys_sendfile() for the 32-bit
> compat API instead of sys_sendfile64(), but in fact the right thing to
> do is to use sys_sendfile64() in all cases.  The 32-bit sendfile64() API
> in glibc uses the sendfile64 syscall, so it has to be capable of doing
> full 64-bit operations.  But the sys_sendfile() kernel implementation
> has a MAX_NON_LFS test in it which explicitly limits the offset to 2^32.
> So, we need to use the sys_sendfile64() implementation in the kernel
> for this case.
> 
> Cc: <stable@...nel.org>
> Signed-off-by: Chris Metcalf <cmetcalf@...era.com>

Acked-by: Arnd Bergmann <arnd@...db.de>
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