include/linux/file.h: remove get_unused_fd() macro
Macro get_unused_fd() is used to allocate a file descriptor with default
flags. Those default flags (0) don't enable close-on-exec.
This can be seen as an unsafe default: in most case close-on-exec should
be enabled to not leak file descriptor across exec().
It would be better to have a "safer" default set of flags, eg. O_CLOEXEC
must be used to enable close-on-exec.
Instead this patch removes get_unused_fd() so that out of tree modules
won't be affect by a runtime behavor change which might introduce other
kind of bugs: it's better to catch the change at build time, making it
easier to fix.
Removing the macro will also promote use of get_unused_fd_flags() (or
anon_inode_getfd()) with flags provided by userspace. Or, if flags cannot
be given by userspace, with flags set to O_CLOEXEC by default.
Signed-off-by: Yann Droneaud <ydroneaud@opteya.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 file changed