linux-kernel - [PATCH v2] selinux: reject invalid ebitmaps

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Message-ID: <20240315172859.634263-1-cgzones@googlemail.com>
Date: Fri, 15 Mar 2024 18:28:44 +0100
From: Christian Göttsche <cgzones@...glemail.com>
To: selinux@...r.kernel.org
Cc: Paul Moore <paul@...l-moore.com>,
	Stephen Smalley <stephen.smalley.work@...il.com>,
	Ondrej Mosnacek <omosnace@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] selinux: reject invalid ebitmaps

Reject ebitmaps with a node containing an empty map or with an incorrect
highbit.  Both checks are already performed by userspace, the former
since 2008 (patch 13cd4c896068 ("initial import from svn trunk revision
2950")), the latter since v2.7 in 2017 (patch 75b14a5de10a ("libsepol:
ebitmap: reject loading bitmaps with incorrect high bit")).

Signed-off-by: Christian Göttsche <cgzones@...glemail.com>
---
v2:
  update wording as suggested in [1]

[1]: https://lore.kernel.org/selinux/d476b21729cafb28c1b881113a563b1f.paul@paul-moore.com/
---
 security/selinux/ss/ebitmap.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/security/selinux/ss/ebitmap.c b/security/selinux/ss/ebitmap.c
index 67c1a73cd5ee..f1ba333f127d 100644
--- a/security/selinux/ss/ebitmap.c
+++ b/security/selinux/ss/ebitmap.c
@@ -448,6 +448,10 @@ int ebitmap_read(struct ebitmap *e, void *fp)
 			goto bad;
 		}
 		map = le64_to_cpu(mapbits);
+		if (!map) {
+			pr_err("SELinux: ebitmap: empty map\n");
+			goto bad;
+		}
 
 		index = (startbit - n->startbit) / EBITMAP_UNIT_SIZE;
 		while (map) {
@@ -455,6 +459,13 @@ int ebitmap_read(struct ebitmap *e, void *fp)
 			map = EBITMAP_SHIFT_UNIT_SIZE(map);
 		}
 	}
+
+	if (n && n->startbit + EBITMAP_SIZE != e->highbit) {
+		pr_err("SELinux: ebitmap: high bit %d is not equal to the expected value %ld\n",
+		       e->highbit, n->startbit + EBITMAP_SIZE);
+		goto bad;
+	}
+
 ok:
 	rc = 0;
 out:
-- 
2.43.0