linux-kernel - [PATCH] capabilities: add bounding set to /proc/self/status

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Message-ID: <20080501183559.GA21279@sergelap.austin.ibm.com>
Date:	Thu, 1 May 2008 13:35:59 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	Andrew Morgan <morgan@...nel.org>,
	linux-security-module@...r.kernel.org,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: [PATCH] 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.

If at all possible (and if acked by Andrew Morgan) it would be nice to
get this into the 2.6.26 cycle.  But I realize it probably is too late
for that.

Signed-off-by: Serge E. Hallyn <serue@...ibm.com>
Acked-by: Michael Kerrisk <mtk.manpages@...il.com>
---
 fs/proc/array.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/fs/proc/array.c b/fs/proc/array.c
index c135cbd..160dd4a 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -297,6 +297,7 @@ 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,
-- 
1.5.3.6

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