linux-kernel - [PATCH v4 1/7] ia64: use get_unused_fd_flags(0) instead of get_unused

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Message-Id: <4d85c4d8c6b1ef6d8dcef6c3550a21b22a45d9a9.1383121137.git.ydroneaud@opteya.com>
Date:	Wed, 30 Oct 2013 20:47:41 +0100
From:	Yann Droneaud <ydroneaud@...eya.com>
To:	Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>,
	Al Viro <viro@...iv.linux.org.uk>
Cc:	Yann Droneaud <ydroneaud@...eya.com>, linux-ia64@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 1/7] 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(), functions anon_inode_getfd()
or get_unused_fd_flags() 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 anon_inode_getfd() or get_unused_fd_flags()
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.

Signed-off-by: Yann Droneaud <ydroneaud@...eya.com>
Link: http://lkml.kernel.org/r/cover.1383121137.git.ydroneaud@opteya.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 5a9ff1c..64757c1 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -2668,7 +2668,7 @@ 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;

-- 
1.8.3.1

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