linux-kernel - [PATCHv6 1/6] ia64: use get_unused_fd_flags(0) instead of get_unused

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Date:	Tue, 11 Mar 2014 11:23:40 +0100
From:	Yann Droneaud <ydroneaud@...eya.com>
To:	Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>
Cc:	Yann Droneaud <ydroneaud@...eya.com>, linux-ia64@...r.kernel.org,
	linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCHv6 1/6] ia64: use get_unused_fd_flags(0) instead of get_unused_fd()

Macro get_unused_fd() is used to allocate a file descriptor with
default flags. Those default flags (0) can be "unsafe":
O_CLOEXEC must be used by default to not leak file descriptor
across exec().

Instead of macro get_unused_fd(), function get_unused_fd_flags()
(or anon_inode_getfd()) should be used with flags given by userspace.
If not possible, flags should be set to O_CLOEXEC to provide userspace
with a default safe behavor.

In a further patch, get_unused_fd() will be removed so that new code
start using get_unused_fd_flags() (or anon_inode_getfd()) with correct
flags.

This patch replaces calls to get_unused_fd() with equivalent call to
get_unused_fd_flags(0) to preserve current behavor for existing code.

The hard coded flag value (0) should be reviewed on a per-subsystem
basis, and, if possible, set to O_CLOEXEC.

Link: http://lkml.kernel.org/r/cover.1394532336.git.ydroneaud@opteya.com
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Yann Droneaud <ydroneaud@...eya.com>
---
 arch/ia64/kernel/perfmon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index cb592773c78b..44b148fbb560 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -2662,7 +2662,7 @@ pfm_context_create(pfm_context_t *ctx, void *arg, int count, struct pt_regs *reg

 	ret = -ENOMEM;

-	fd = get_unused_fd();
+	fd = get_unused_fd_flags(0);
 	if (fd < 0)
 		return fd;

-- 
1.8.5.3

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