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| author | Yann Droneaud <ydroneaud@opteya.com> | 2014-12-10 15:45:47 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-10 17:41:10 -0800 |
| commit | f938612dd97d481b8b5bf960c992ae577f081c17 (patch) | |
| tree | ba1e620455a87fb25502ee3b8be7193c1ed9e5a9 | |
| parent | 8d10a035829cacbd84bf35610870c35e566d1242 (diff) | |
| download | lwn-f938612dd97d481b8b5bf960c992ae577f081c17.tar.gz lwn-f938612dd97d481b8b5bf960c992ae577f081c17.zip | |
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>
| -rw-r--r-- | include/linux/file.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/file.h b/include/linux/file.h index 4d69123377a2..f87d30882a24 100644 --- a/include/linux/file.h +++ b/include/linux/file.h @@ -66,7 +66,6 @@ extern void set_close_on_exec(unsigned int fd, int flag); extern bool get_close_on_exec(unsigned int fd); extern void put_filp(struct file *); extern int get_unused_fd_flags(unsigned flags); -#define get_unused_fd() get_unused_fd_flags(0) extern void put_unused_fd(unsigned int fd); extern void fd_install(unsigned int fd, struct file *file); |