Commit 8a59bd3e authored by Yann Droneaud's avatar Yann Droneaud Committed by David S. Miller

sctp: 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: default avatarYann Droneaud <ydroneaud@opteya.com>
Acked-by: default avatarVlad Yasevich <vyasevich@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 83d7af64
...@@ -4312,7 +4312,7 @@ static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval ...@@ -4312,7 +4312,7 @@ static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval
goto out; goto out;
/* Map the socket to an unused fd that can be returned to the user. */ /* Map the socket to an unused fd that can be returned to the user. */
retval = get_unused_fd(); retval = get_unused_fd_flags(0);
if (retval < 0) { if (retval < 0) {
sock_release(newsock); sock_release(newsock);
goto out; goto out;
......
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