Commit d91bff3011cf ("proc/sysctl: add shared variables for range check")
adds some shared const variables to be used instead of a local copy in
each source file.
Warn when a chunk duplicates one of these values in a ctl_table struct:
$ scripts/checkpatch.pl 0001-test-commit.patch
WARNING: duplicated sysctl range checking value 'zero', consider using the
shared one in include/linux/sysctl.h
#27: FILE: arch/arm/kernel/isa.c:48:
+ .extra1 = &zero,
WARNING: duplicated sysctl range checking value 'int_max', consider using
the shared one in include/linux/sysctl.h
#28: FILE: arch/arm/kernel/isa.c:49:
+ .extra2 = &int_max,
total: 0 errors, 2 warnings, 14 lines checked
Reviewed-by: Kees Cook <[email protected]>
Signed-off-by: Matteo Croce <[email protected]>
---
scripts/checkpatch.pl | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index bb28b178d929..91a4b0043b64 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -6639,6 +6639,12 @@ sub process {
"unknown module license " .
$extracted_string . "\n" . $herecurr);
}
}
+
+# check for sysctl duplicate constants
+ if ($line =~ /\.extra[12]\s*=\s*&(zero|one|int_max)\b/) {
+ WARN("DUPLICATED_SYSCTL_CONST",
+ "duplicated sysctl range checking value '$1',
consider using the shared one in include/linux/sysctl.h\n" . $herecurr);
+ }
}
# If we have no input at all, then there is nothing to report on
--
2.21.0
