70 lines
2 KiB
Perl
Executable file
70 lines
2 KiB
Perl
Executable file
#!/usr/bin/perl
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# Check for malloc calls not shortly followed by initialisation.
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#
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# Known limitations:
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# - false negative: can't see allocations spanning more than one line
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# - possible false negatives, see patterns
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# - false positive: malloc-malloc-init-init is not accepted
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# - false positives: "non-standard" init functions (eg, the things being
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# initialised is not the first arg, or initialise struct members)
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#
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# Since false positives are expected, the results must be manually reviewed.
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#
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# Typical usage: scripts/malloc-init.pl library/*.c
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use warnings;
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use strict;
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use utf8;
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use open qw(:std utf8);
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my $limit = 7;
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my $inits = qr/memset|memcpy|_init|fread|base64_..code/;
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# cases to bear in mind:
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#
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# 0. foo = malloc(...); memset( foo, ... );
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# 1. *foo = malloc(...); memset( *foo, ... );
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# 2. type *foo = malloc(...); memset( foo, ...);
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# 3. foo = malloc(...); foo_init( (type *) foo );
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# 4. foo = malloc(...); for(i=0..n) { init( &foo[i] ); }
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#
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# The chosen patterns are a bit relaxed, but unlikely to cause false positives
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# in real code (initialising *foo or &foo instead of foo will likely be caught
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# by functional tests).
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#
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my $id = qr/([a-zA-Z-0-9_\->\.]*)/;
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my $prefix = qr/\s(?:\*?|\&?|\([a-z_]* \*\))\s*/;
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my $name;
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my $line;
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my @bad;
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die "Usage: $0 file.c [...]\n" unless @ARGV;
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while (my $file = shift @ARGV)
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{
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open my $fh, "<", $file or die "read $file failed: $!\n";
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while (<$fh>)
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{
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if( /mbedtls_malloc\(/ ) {
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if( /$id\s*=.*mbedtls_malloc\(/ ) {
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push @bad, "$file:$line:$name" if $name;
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$name = $1;
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$line = $.;
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} else {
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push @bad, "$file:$.:???" unless /return mbedtls_malloc/;
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}
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} elsif( $name && /(?:$inits)\($prefix\Q$name\E\b/ ) {
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undef $name;
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} elsif( $name && $. - $line > $limit ) {
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push @bad, "$file:$line:$name";
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undef $name;
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undef $line;
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}
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}
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close $fh or die;
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}
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print "$_\n" for @bad;
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