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authorJoe Perches <joe@perches.com>2017-05-08 15:55:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-08 17:15:10 -0700
commit0b523769ebb9473c60df1b0f70615aa82ebac2c9 (patch)
tree7e9d9ac957dffd3a98750d4a82ece52286692774 /scripts
parentcd8618ab3df3ac6018cecb9dc626ff72c39eb503 (diff)
checkpatch: add ability to find bad uses of vsprintf %p<foo> extensions
%pK was at least once misused at %pk in an out-of-tree module. This lead to some security concerns. Add the ability to track single and multiple line statements for misuses of %p<foo>. [akpm@linux-foundation.org: add helpful comment into lib/vsprintf.c] [akpm@linux-foundation.org: text tweak] Link: http://lkml.kernel.org/r/163a690510e636a23187c0dc9caa09ddac6d4cde.1488228427.git.joe@perches.com Signed-off-by: Joe Perches <joe@perches.com> Acked-by: Kees Cook <keescook@chromium.org> Acked-by: William Roberts <william.c.roberts@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts')
-rwxr-xr-xscripts/checkpatch.pl26
1 files changed, 26 insertions, 0 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 30eeba4f1602..732bb3e2fe9a 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5663,6 +5663,32 @@ sub process {
}
}
+ # check for vsprintf extension %p<foo> misuses
+ if ($^V && $^V ge 5.10.0 &&
+ defined $stat &&
+ $stat =~ /^\+(?![^\{]*\{\s*).*\b(\w+)\s*\(.*$String\s*,/s &&
+ $1 !~ /^_*volatile_*$/) {
+ my $bad_extension = "";
+ my $lc = $stat =~ tr@\n@@;
+ $lc = $lc + $linenr;
+ for (my $count = $linenr; $count <= $lc; $count++) {
+ my $fmt = get_quoted_string($lines[$count - 1], raw_line($count, 0));
+ $fmt =~ s/%%//g;
+ if ($fmt =~ /(\%[\*\d\.]*p(?![\WFfSsBKRraEhMmIiUDdgVCbGN]).)/) {
+ $bad_extension = $1;
+ last;
+ }
+ }
+ if ($bad_extension ne "") {
+ my $stat_real = raw_line($linenr, 0);
+ for (my $count = $linenr + 1; $count <= $lc; $count++) {
+ $stat_real = $stat_real . "\n" . raw_line($count, 0);
+ }
+ WARN("VSPRINTF_POINTER_EXTENSION",
+ "Invalid vsprintf pointer extension '$bad_extension'\n" . "$here\n$stat_real\n");
+ }
+ }
+
# Check for misused memsets
if ($^V && $^V ge 5.10.0 &&
defined $stat &&

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