linux-kernel - [PATCH v3 1/2] capability: add cap

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Date:   Wed, 25 Jan 2023 16:55:56 +0100
From:   Mateusz Guzik <mjguzik@...il.com>
To:     viro@...iv.linux.org.uk
Cc:     serge@...lyn.com, torvalds@...ux-foundation.org,
        paul@...l-moore.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Mateusz Guzik <mjguzik@...il.com>
Subject: [PATCH v3 1/2] capability: add cap_isidentical

Signed-off-by: Mateusz Guzik <mjguzik@...il.com>
Reviewed-by: Serge Hallyn <serge@...lyn.com>
---
 include/linux/capability.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/capability.h b/include/linux/capability.h
index 65efb74c3585..736a973c677a 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -156,6 +156,16 @@ static inline bool cap_isclear(const kernel_cap_t a)
 	return true;
 }
 
+static inline bool cap_isidentical(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 false;
+	}
+	return true;
+}
+
 /*
  * Check if "a" is a subset of "set".
  * return true if ALL of the capabilities in "a" are also in "set"
-- 
2.39.0