Messages in this thread | | | Date | Tue, 02 Jul 2013 13:50:32 -0400 | From | Vlad Yasevich <> | Subject | Re: [PATCH 12/13] sctp: use get_unused_fd_flags(0) instead of get_unused_fd() |
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On 07/02/2013 12:39 PM, Yann Droneaud wrote: > 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@opteya.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
-vlad
> --- > net/sctp/socket.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/net/sctp/socket.c b/net/sctp/socket.c > index 66fcdcf..caa5919 100644 > --- a/net/sctp/socket.c > +++ b/net/sctp/socket.c > @@ -4320,7 +4320,7 @@ static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval > goto out; > > /* 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) { > sock_release(newsock); > goto out; >
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