linux-kernel - [PATCH 1/2] CAPABILITIES: add cap

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Date:	Mon,  9 Mar 2015 21:35:46 +0100
From:	Mateusz Guzik <mguzik@...hat.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>,
	Serge Hallyn <serge.hallyn@...onical.com>
Cc:	Paul Moore <pmoore@...hat.com>, Eric Paris <eparis@...hat.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org
Subject: [PATCH 1/2] CAPABILITIES: add cap_isequal helper

Can be used to determine whether two given sets have the same
capabilities.

Signed-off-by: Mateusz Guzik <mguzik@...hat.com>
---
 include/linux/capability.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/capability.h b/include/linux/capability.h
index af9f0b9..2fcf941 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -155,6 +155,16 @@ static inline int cap_isclear(const kernel_cap_t a)
 	return 1;
 }
 
+static inline int cap_isequal(const kernel_cap_t a, const kernel_cap_t b)
+{
+	unsigned __capi;
+	CAP_FOR_EACH_U32(__capi) {
+		if (a.cap[__capi] != b.cap[__capi])
+			return 0;
+	}
+	return 1;
+}
+
 /*
  * Check if "a" is a subset of "set".
  * return 1 if ALL of the capabilities in "a" are also in "set"
-- 
1.8.3.1

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