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scripts: checkpatch: diagnose uses of `%pA` in the C side as errors 

The `%pA` format specifier is only intended to be used from Rust.

`checkpatch.pl` already gives a warning for invalid specificers:

    WARNING: Invalid vsprintf pointer extension '%pA'

This makes it an error and introduces an explanatory message:

    ERROR: Invalid vsprintf pointer extension '%pA' - '%pA' is only intended to be used from Rust code

Suggested-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com>
Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com>
Co-developed-by: Wedson Almeida Filho <wedsonaf@google.com>
Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com>
Co-developed-by: Joe Perches <joe@perches.com>
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Miguel Ojeda 2022-05-22 03:11:08 +02:00
parent 787983da77
commit de48fa1a01
1 changed files with 6 additions and 2 deletions
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8
scripts/checkpatch.pl
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@ -6783,15 +6783,19 @@ sub process {
}
if ($bad_specifier ne "") {
my $stat_real = get_stat_real($linenr, $lc);
my $msg_level = \&WARN;
my $ext_type = "Invalid";
my $use = "";
if ($bad_specifier =~ /p[Ff]/) {
$use = " - use %pS instead";
$use =~ s/pS/ps/ if ($bad_specifier =~ /pf/);
} elsif ($bad_specifier =~ /pA/) {
$use = " - '%pA' is only intended to be used from Rust code";
$msg_level = \&ERROR;
}
WARN("VSPRINTF_POINTER_EXTENSION",
"$ext_type vsprintf pointer extension '$bad_specifier'$use\n" . "$here\n$stat_real\n");
&{$msg_level}("VSPRINTF_POINTER_EXTENSION",
"$ext_type vsprintf pointer extension '$bad_specifier'$use\n" . "$here\n$stat_real\n");
}
}
}