linux-kernel - [PATCH 4/5] all: wrap getdents64 syscall

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Message-ID: <1453741047-5498-5-git-send-email-ynorov@caviumnetworks.com>
Date:	Mon, 25 Jan 2016 19:57:26 +0300
From:	Yury Norov <ynorov@...iumnetworks.com>
To:	<arnd@...db.de>, <catalin.marinas@....com>,
	<heiko.carstens@...ibm.com>, <schwidefsky@...ibm.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-s390@...r.kernel.org>,
	<linux-arch@...r.kernel.org>
CC:	<Prasun.Kapoor@...iumnetworks.com>, <pinskia@...il.com>,
	<agraf@...e.de>, <broonie@...nel.org>, <joseph@...esourcery.com>,
	<christoph.muellner@...obroma-systems.com>,
	<Nathan_Lynch@...tor.com>, <klimov.linux@...il.com>,
	Yury Norov <ynorov@...iumnetworks.com>
Subject: [PATCH 4/5] all: wrap getdents64 syscall

This system call may be handled by compat handler if
__ARCH_WANT_COMPAT_SYS_GETDENTS64 is defined. So we
should declare wrapper otherwise only.

Signed-off-by: Yury Norov <ynorov@...iumnetworks.com>
---
 fs/readdir.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/readdir.c b/fs/readdir.c
index ced6791..d34cc49 100644
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -17,6 +17,7 @@
 #include <linux/dirent.h>
 #include <linux/security.h>
 #include <linux/syscalls.h>
+#include <linux/compat.h>
 #include <linux/unistd.h>
 
 #include <asm/uaccess.h>
@@ -274,8 +275,13 @@ efault:
 	return -EFAULT;
 }
 
+#ifndef __ARCH_WANT_COMPAT_SYS_GETDENTS64
+SYSCALL_DEFINE_WRAP3(getdents64, unsigned int, fd,
+		struct linux_dirent64 __user *, dirent, unsigned int, count)
+#else
 SYSCALL_DEFINE3(getdents64, unsigned int, fd,
 		struct linux_dirent64 __user *, dirent, unsigned int, count)
+#endif
 {
 	struct fd f;
 	struct linux_dirent64 __user * lastdirent;
-- 
2.5.0