capabilities: add bounding set to /proc/self/status

There is currently no way to query the bounding set of another task.  As there
appears to be no security reason not to, and as Michael Kerrisk points out the
following valid reasons to do so exist:

* consistency (I can see all of the other per-thread/process sets in
  /proc/.../status)

* debugging -- I could imagine that it would make the job of debugging an
  application that uses capabilities a little simpler.

this patch adds the bounding set to /proc/self/status right after the
effective set.

Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Acked-by: Michael Kerrisk <mtk.manpages@gmail.com>
Acked-by: Andrew G. Morgan <morgan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/proc/array.c b/fs/proc/array.c
index dca997a93bff32295fd3af13737d17cd24da9d7b..9e3b8c33c24b65c496f815658895dd4d2afd9c00 100644 (file)
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -298,6 +298,7 @@ static inline void task_cap(struct seq_file *m, struct task_struct *p)
        render_cap_t(m, "CapInh:\t", &p->cap_inheritable);
        render_cap_t(m, "CapPrm:\t", &p->cap_permitted);
        render_cap_t(m, "CapEff:\t", &p->cap_effective);
+       render_cap_t(m, "CapBnd:\t", &p->cap_bset);
 }
 
 static inline void task_context_switch_counts(struct seq_file *m,