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procfs: use an enum for possible hidepid values

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Previously, the hidepid parameter was checked by comparing literal
integers 0, 1, 2.  Let's add a proper enum for this, to make the
checking more expressive:

        0 → HIDEPID_OFF
        1 → HIDEPID_NO_ACCESS
        2 → HIDEPID_INVISIBLE

This changes the internal labelling only, the userspace-facing interface
remains unmodified, and still works with literal integers 0, 1, 2.

No functional changes.

Link: http://lkml.kernel.org/r/1484572984-13388-2-git-send-email-djalal@gmail.com
Signed-off-by: Lafcadio Wluiki <wluikil@gmail.com>
Signed-off-by: Djalal Harouni <tixxdz@gmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Lafcadio Wluiki 2017-02-24 15:00:23 -08:00 • committed by Linus Torvalds
parent a0a07b87f3
commit 796f571b0c
4 changed files with 13 additions and 6 deletions
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6
include/linux/pid_namespace.h
View file

@ -21,6 +21,12 @@ struct pidmap {
struct fs_pin;
enum { /* definitions for pid_namespace's hide_pid field */
HIDEPID_OFF = 0,
HIDEPID_NO_ACCESS = 1,
HIDEPID_INVISIBLE = 2,
};
struct pid_namespace {
struct kref kref;
struct pidmap pidmap[PIDMAP_ENTRIES];