linux-hardening - [PATCH][next] checkpatch: add a couple new alloc functions to alloc with multiplies check

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Message-ID: <ZQCaO+tYycDxVLy7@work>
Date:   Tue, 12 Sep 2023 11:04:59 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Andy Whitcroft <apw@...onical.com>, Joe Perches <joe@...ches.com>,
        Dwaipayan Ray <dwaipayanray1@...il.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org
Subject: [PATCH][next] checkpatch: add a couple new alloc functions to alloc
 with multiplies check

vmalloc() and vzalloc() functions have now 2-factor multiplication
argument forms vmalloc_array() and vcalloc(), correspondingly.

Add alloc-with-multiplies checks for these new functions.

Link: https://github.com/KSPP/linux/issues/342
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 scripts/checkpatch.pl | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 7d16f863edf1..45265d0eee1b 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -7207,17 +7207,19 @@ sub process {
 			    "Prefer $3(sizeof(*$1)...) over $3($4...)\n" . $herecurr);
 		}
 
-# check for (kv|k)[mz]alloc with multiplies that could be kmalloc_array/kvmalloc_array/kvcalloc/kcalloc
+# check for (kv|k|v)[mz]alloc with multiplies that could be kmalloc_array/kvmalloc_array/vmalloc_array/kvcalloc/kcalloc/vcalloc
 		if ($perl_version_ok &&
 		    defined $stat &&
-		    $stat =~ /^\+\s*($Lval)\s*\=\s*(?:$balanced_parens)?\s*((?:kv|k)[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)\s*,/) {
+		    $stat =~ /^\+\s*($Lval)\s*\=\s*(?:$balanced_parens)?\s*((?:kv|k|v)[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)\s*,?/) {
 			my $oldfunc = $3;
 			my $a1 = $4;
 			my $a2 = $10;
 			my $newfunc = "kmalloc_array";
 			$newfunc = "kvmalloc_array" if ($oldfunc eq "kvmalloc");
+			$newfunc = "vmalloc_array" if ($oldfunc eq "vmalloc");
 			$newfunc = "kvcalloc" if ($oldfunc eq "kvzalloc");
 			$newfunc = "kcalloc" if ($oldfunc eq "kzalloc");
+			$newfunc = "vcalloc" if ($oldfunc eq "vzalloc");
 			my $r1 = $a1;
 			my $r2 = $a2;
 			if ($a1 =~ /^sizeof\s*\S/) {
@@ -7233,7 +7235,7 @@ sub process {
 					 "Prefer $newfunc over $oldfunc with multiply\n" . $herectx) &&
 				    $cnt == 1 &&
 				    $fix) {
-					$fixed[$fixlinenr] =~ s/\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*((?:kv|k)[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)/$1 . ' = ' . "$newfunc(" . trim($r1) . ', ' . trim($r2)/e;
+					$fixed[$fixlinenr] =~ s/\b($Lval)\s*\=\s*(?:$balanced_parens)?\s*((?:kv|k|v)[mz]alloc)\s*\(\s*($FuncArg)\s*\*\s*($FuncArg)/$1 . ' = ' . "$newfunc(" . trim($r1) . ', ' . trim($r2)/e;
 				}
 			}
 		}
-- 
2.34.1