linux-kernel - [PATCH 9/9] sysfs: disallow world-writable files.

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Message-Id: <1398137612-9714-10-git-send-email-rusty@rustcorp.com.au>
Date:	Tue, 22 Apr 2014 13:03:32 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	linux-kernel@...r.kernel.org
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Dave Jones <davej@...hat.com>, Joe Perches <joe@...ches.com>
Subject: [PATCH 9/9] sysfs: disallow world-writable files.

This check was introduced in 2006 by Alexey Dobriyan (9774a1f54f173)
for module parameters; we removed it when we unified the check into
VERIFY_OCTAL_PERMISSIONS() as sysfs didn't have the same requirement.
Now all those users are fixed, reintroduce it.

Cc: Alexey Dobriyan <adobriyan@...il.com>
Cc: Dave Jones <davej@...hat.com>
Cc: Joe Perches <joe@...ches.com>
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
---
 include/linux/kernel.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 4c52907a6d8b..43e1c6a9683e 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -849,5 +849,7 @@ static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
 	 /* User perms >= group perms >= other perms */			\
 	 BUILD_BUG_ON_ZERO(((perms) >> 6) < (((perms) >> 3) & 7)) +	\
 	 BUILD_BUG_ON_ZERO((((perms) >> 3) & 7) < ((perms) & 7)) +	\
+	 /* Other writable?  Generally considered a bad idea. */	\
+	 BUILD_BUG_ON_ZERO((perms) & 2) +				\
 	 (perms))
 #endif
-- 
1.8.3.2

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