From: "Gustavo A. R. Silva" <gustavoars@kernel.org>
To: Andy Whitcroft <apw@canonical.com>, Joe Perches <joe@perches.com>,
Dwaipayan Ray <dwaipayanray1@gmail.com>,
Lukas Bulwahn <lukas.bulwahn@gmail.com>
Cc: linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavoars@kernel.org>,
linux-hardening@vger.kernel.org
Subject: [PATCH][next] checkpatch: add a couple new alloc functions to alloc with multiplies check
Date: Tue, 12 Sep 2023 11:04:59 -0600 [thread overview]
Message-ID: <ZQCaO+tYycDxVLy7@work> (raw)
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@kernel.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
next reply other threads:[~2023-09-12 17:04 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-12 17:04 Gustavo A. R. Silva [this message]
2023-09-12 17:51 ` [PATCH][next] checkpatch: add a couple new alloc functions to alloc with multiplies check Joe Perches
2023-09-15 3:31 ` Kees Cook
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