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From: Kees Cook <keescook@chromium.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Kees Cook <keescook@chromium.org>,
	Peter Enderborg <peter.enderborg@sony.com>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	linux-kernel@vger.kernel.org
Subject: [PATCH] debugfs: Make debugfs_allow RO after init
Date: Mon,  5 Apr 2021 14:39:59 -0700	[thread overview]
Message-ID: <20210405213959.3079432-1-keescook@chromium.org> (raw)

Since debugfs_allow is only set at boot time during __init, make it
read-only after being set.

Cc: Peter Enderborg <peter.enderborg@sony.com>
Fixes: a24c6f7bc923 ("debugfs: Add access restriction option")
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 fs/debugfs/inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 22e86ae4dd5a..1d252164d97b 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -35,7 +35,7 @@
 static struct vfsmount *debugfs_mount;
 static int debugfs_mount_count;
 static bool debugfs_registered;
-static unsigned int debugfs_allow = DEFAULT_DEBUGFS_ALLOW_BITS;
+static unsigned int debugfs_allow __ro_after_init = DEFAULT_DEBUGFS_ALLOW_BITS;
 
 /*
  * Don't allow access attributes to be changed whilst the kernel is locked down
-- 
2.25.1


             reply	other threads:[~2021-04-05 21:40 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-05 21:39 Kees Cook [this message]
2021-04-06  5:59 ` [PATCH] debugfs: Make debugfs_allow RO after init Peter.Enderborg

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