linux-kernel - [PATCH] checkpatch: forbid filesystem accesses from within the kernel

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Date:   Thu,  5 Jul 2018 14:47:50 -0700
From:   Prakruthi Deepak Heragu <pheragu@...eaurora.org>
To:     apw@...onical.com, joe@...ches.com
Cc:     linux-kernel@...r.kernel.org, ckadabi@...eaurora.org,
        tsoni@...eaurora.org, bryanh@...eaurora.org,
        Prakruthi Deepak Heragu <pheragu@...eaurora.org>
Subject: [PATCH] checkpatch: forbid filesystem accesses from within the kernel

As use of sys_open/close/read/write system calls from within the kernel 
code is inappropriate, an error is triggered if used.

Signed-off-by: Prakruthi Deepak Heragu <pheragu@...eaurora.org>
---
 scripts/checkpatch.pl | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index a9c0550..e6e7e09 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5372,6 +5372,13 @@ sub process {
 			     "Avoid line continuations in quoted strings\n" . $herecurr);
 		}
 
+# sys_open/read/write/close are not allowed in the kernel
+		if ($line =~ /\b(sys_(?:open|read|write|close))\b/) {
+			ERROR("FILE_OPS",
+			      "$1 is inappropriate in kernel code.\n" .
+			      $herecurr);
+		}
+
 # warn about #if 0
 		if ($line =~ /^.\s*\#\s*if\s+0\b/) {
 			CHK("REDUNDANT_CODE",
-- 
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