linux-kernel - [ 146/149] compat: use sys_sendfile64() implementation for sendfile syscall

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Date:	Fri, 30 Mar 2012 12:50:59 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Arnd Bergmann <arnd@...db.de>,
	Chris Metcalf <cmetcalf@...era.com>
Subject: [ 146/149] compat: use sys_sendfile64() implementation for sendfile syscall

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chris Metcalf <cmetcalf@...era.com>

commit 1631fcea8399da5e80a80084b3b8c5bfd99d21e7 upstream.

<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.

Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Chris Metcalf <cmetcalf@...era.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 include/asm-generic/unistd.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/asm-generic/unistd.h
+++ b/include/asm-generic/unistd.h
@@ -218,7 +218,7 @@ __SC_COMP(__NR_pwritev, sys_pwritev, com

 /* fs/sendfile.c */
 #define __NR3264_sendfile 71
-__SC_3264(__NR3264_sendfile, sys_sendfile64, sys_sendfile)
+__SYSCALL(__NR3264_sendfile, sys_sendfile64)

 /* fs/select.c */
 #define __NR_pselect6 72

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