find dynamic stack allocations in checkstack.pl

Currently, checkstack.pl only looks for fixed subtractions from the stack
pointer.  However, things like this:

void function(int size)
{
        char stackbuster[size << 2];
...

are certainly worth pointing out, I think.

This could perhaps be done more cleanly, and the following patch only
adds "dynamic" REs for x86 and x86_64, but it works:

0x00b0 crypto_cbc_decrypt_inplace [cbc]:                Dynamic (%rax)
0x00ad crypto_pcbc_decrypt_inplace [pcbc]:              Dynamic (%rax)
0x02f6 crypto_pcbc_encrypt_inplace [pcbc]:              Dynamic (%rax)
0x036c _crypto_xcbc_digest_setkey [xcbc]:               Dynamic (%rax)
...

(Inspired by Keith Owens' old stack-check script)

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 23 insertions, 1 deletions

diff --git a/scripts/checkstack.pl b/scripts/checkstack.pl
index 340ad692051..358f96c75b4 100755
--- a/scripts/checkstack.pl
+++ b/scripts/checkstack.pl
@@ -26,8 +26,12 @@
 # $& (whole re) matches the complete objdump line with the stack growth
 # $1 (first bracket) matches the size of the stack growth
 #
+# $dre is similar, but for dynamic stack redutions:
+# $& (whole re) matches the complete objdump line with the stack growth
+# $1 (first bracket) matches the dynamic amount of the stack growth
+#
 # use anything else and feel the pain ;)
-my (@stack, $re, $x, $xs);
+my (@stack, $re, $dre, $x, $xs);
 {
         my $arch = shift;
         if ($arch eq "") {
@@ -46,9 +50,11 @@ my (@stack, $re, $x, $xs);
         } elsif ($arch =~ /^i[3456]86$/) {
                 #c0105234:       81 ec ac 05 00 00       sub    $0x5ac,%esp
                 $re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%esp$/o;
+                $dre = qr/^.*[as][du][db]    (%.*),\%esp$/o;
         } elsif ($arch eq 'x86_64') {
                 #    2f60:      48 81 ec e8 05 00 00    sub    $0x5e8,%rsp
                 $re = qr/^.*[as][du][db]    \$(0x$x{1,8}),\%rsp$/o;
+                $dre = qr/^.*[as][du][db]    (\%.*),\%rsp$/o;
         } elsif ($arch eq 'ia64') {
                 #e0000000044011fc:       01 0f fc 8c     adds r12=-384,r12
                 $re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
@@ -141,6 +147,22 @@ while (my $line = <STDIN>) {
                 next if ($size < 100);
                 push @stack, "$intro$size\n";
         }
+        elsif (defined $dre && $line =~ m/$dre/) {
+                my $size = "Dynamic ($1)";
+
+                next if $line !~ m/^($xs*)/;
+                my $addr = $1;
+                $addr =~ s/ /0/g;
+                $addr = "0x$addr";
+
+                my $intro = "$addr $func [$file]:";
+                my $padlen = 56 - length($intro);
+                while ($padlen > 0) {
+                        $intro .= '     ';
+                        $padlen -= 8;
+                }
+                push @stack, "$intro$size\n";
+        }
 }
 
 print sort bysize @stack;