From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CBB0EC2BA1A for ; Tue, 7 Apr 2020 03:12:49 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 855AF20801 for ; Tue, 7 Apr 2020 03:12:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="RTQMuUqL" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 855AF20801 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 34C108E00AA; Mon, 6 Apr 2020 23:12:49 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 323C88E0062; Mon, 6 Apr 2020 23:12:49 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 260788E00AA; Mon, 6 Apr 2020 23:12:49 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0041.hostedemail.com [216.40.44.41]) by kanga.kvack.org (Postfix) with ESMTP id 08A898E0062 for ; Mon, 6 Apr 2020 23:12:49 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id BDE82A8D0 for ; Tue, 7 Apr 2020 03:12:48 +0000 (UTC) X-FDA: 76679586816.05.bit70_18810cfbe9824 X-HE-Tag: bit70_18810cfbe9824 X-Filterd-Recvd-Size: 7278 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf22.hostedemail.com (Postfix) with ESMTP for ; Tue, 7 Apr 2020 03:12:48 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2395C20769; Tue, 7 Apr 2020 03:12:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586229167; bh=aA5nLP4kpf/2+8sfe0egx6i0Av7eRNTOuBpmYhvZ3pU=; h=Date:From:To:Subject:In-Reply-To:From; b=RTQMuUqLZyFBF5Ue1r84xezPfxpH+N4lhYPlJtL2HOOcuBvbhJ1m93Wexn75ncg+I EIxgfNmc4V3VbXqaDU0lGrErS59+WNUhCR+YrndrMcdvpqp4gjZ0X8wHnYfhYfRqwS N25img/P0vdSPApaRpu7KiFX7iuUBpRCz/Fw6vuc= Date: Mon, 06 Apr 2020 20:12:45 -0700 From: Andrew Morton To: akpm@linux-foundation.org, andreyknvl@google.com, ard.biesheuvel@linaro.org, arnd@arndb.de, aryabinin@virtuozzo.com, dan.carpenter@oracle.com, dvyukov@google.com, glider@google.com, gustavo@embeddedor.com, keescook@chromium.org, lenaptr@google.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, torvalds@linux-foundation.org Subject: [patch 163/166] ubsan: include bug type in report header Message-ID: <20200407031245.WM-fHNvX-%akpm@linux-foundation.org> In-Reply-To: <20200406200254.a69ebd9e08c4074e41ddebaf@linux-foundation.org> User-Agent: s-nail v14.8.16 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Kees Cook Subject: ubsan: include bug type in report header When syzbot tries to figure out how to deduplicate bug reports, it prefers seeing a hint about a specific bug type (we can do better than just "UBSAN"). This lifts the handler reason into the UBSAN report line that includes the file path that tripped a check. Unfortunately, UBSAN does not provide function names. Link: http://lkml.kernel.org/r/20200227193516.32566-7-keescook@chromium.org Suggested-by: Dmitry Vyukov Link: https://lore.kernel.org/lkml/CACT4Y+bsLJ-wFx_TaXqax3JByUOWB3uk787LsyMVcfW6JzzGvg@mail.gmail.com Signed-off-by: Kees Cook Cc: Alexander Potapenko Cc: Andrey Konovalov Cc: Andrey Ryabinin Cc: Ard Biesheuvel Cc: Arnd Bergmann Cc: Dan Carpenter Cc: Elena Petrova Cc: "Gustavo A. R. Silva" Signed-off-by: Andrew Morton --- lib/ubsan.c | 36 +++++++++++++++--------------------- 1 file changed, 15 insertions(+), 21 deletions(-) --- a/lib/ubsan.c~ubsan-include-bug-type-in-report-header +++ a/lib/ubsan.c @@ -45,13 +45,6 @@ static bool was_reported(struct source_l return test_and_set_bit(REPORTED_BIT, &location->reported); } -static void print_source_location(const char *prefix, - struct source_location *loc) -{ - pr_err("%s %s:%d:%d\n", prefix, loc->file_name, - loc->line & LINE_MASK, loc->column & COLUMN_MASK); -} - static bool suppress_report(struct source_location *loc) { return current->in_ubsan || was_reported(loc); @@ -140,13 +133,14 @@ static void val_to_string(char *str, siz } } -static void ubsan_prologue(struct source_location *location) +static void ubsan_prologue(struct source_location *loc, const char *reason) { current->in_ubsan++; pr_err("========================================" "========================================\n"); - print_source_location("UBSAN: Undefined behaviour in", location); + pr_err("UBSAN: %s in %s:%d:%d\n", reason, loc->file_name, + loc->line & LINE_MASK, loc->column & COLUMN_MASK); } static void ubsan_epilogue(void) @@ -180,12 +174,12 @@ static void handle_overflow(struct overf if (suppress_report(&data->location)) return; - ubsan_prologue(&data->location); + ubsan_prologue(&data->location, type_is_signed(type) ? + "signed-integer-overflow" : + "unsigned-integer-overflow"); val_to_string(lhs_val_str, sizeof(lhs_val_str), type, lhs); val_to_string(rhs_val_str, sizeof(rhs_val_str), type, rhs); - pr_err("%s integer overflow:\n", - type_is_signed(type) ? "signed" : "unsigned"); pr_err("%s %c %s cannot be represented in type %s\n", lhs_val_str, op, @@ -225,7 +219,7 @@ void __ubsan_handle_negate_overflow(stru if (suppress_report(&data->location)) return; - ubsan_prologue(&data->location); + ubsan_prologue(&data->location, "negation-overflow"); val_to_string(old_val_str, sizeof(old_val_str), data->type, old_val); @@ -245,7 +239,7 @@ void __ubsan_handle_divrem_overflow(stru if (suppress_report(&data->location)) return; - ubsan_prologue(&data->location); + ubsan_prologue(&data->location, "division-overflow"); val_to_string(rhs_val_str, sizeof(rhs_val_str), data->type, rhs); @@ -264,7 +258,7 @@ static void handle_null_ptr_deref(struct if (suppress_report(data->location)) return; - ubsan_prologue(data->location); + ubsan_prologue(data->location, "null-ptr-deref"); pr_err("%s null pointer of type %s\n", type_check_kinds[data->type_check_kind], @@ -279,7 +273,7 @@ static void handle_misaligned_access(str if (suppress_report(data->location)) return; - ubsan_prologue(data->location); + ubsan_prologue(data->location, "misaligned-access"); pr_err("%s misaligned address %p for type %s\n", type_check_kinds[data->type_check_kind], @@ -295,7 +289,7 @@ static void handle_object_size_mismatch( if (suppress_report(data->location)) return; - ubsan_prologue(data->location); + ubsan_prologue(data->location, "object-size-mismatch"); pr_err("%s address %p with insufficient space\n", type_check_kinds[data->type_check_kind], (void *) ptr); @@ -354,7 +348,7 @@ void __ubsan_handle_out_of_bounds(struct if (suppress_report(&data->location)) return; - ubsan_prologue(&data->location); + ubsan_prologue(&data->location, "array-index-out-of-bounds"); val_to_string(index_str, sizeof(index_str), data->index_type, index); pr_err("index %s is out of range for type %s\n", index_str, @@ -375,7 +369,7 @@ void __ubsan_handle_shift_out_of_bounds( if (suppress_report(&data->location)) goto out; - ubsan_prologue(&data->location); + ubsan_prologue(&data->location, "shift-out-of-bounds"); val_to_string(rhs_str, sizeof(rhs_str), rhs_type, rhs); val_to_string(lhs_str, sizeof(lhs_str), lhs_type, lhs); @@ -407,7 +401,7 @@ EXPORT_SYMBOL(__ubsan_handle_shift_out_o void __ubsan_handle_builtin_unreachable(struct unreachable_data *data) { - ubsan_prologue(&data->location); + ubsan_prologue(&data->location, "unreachable"); pr_err("calling __builtin_unreachable()\n"); ubsan_epilogue(); panic("can't return from __builtin_unreachable()"); @@ -422,7 +416,7 @@ void __ubsan_handle_load_invalid_value(s if (suppress_report(&data->location)) return; - ubsan_prologue(&data->location); + ubsan_prologue(&data->location, "invalid-load"); val_to_string(val_str, sizeof(val_str), data->type, val); _