From patchwork Tue Nov 8 19:52:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Francis Laniel X-Patchwork-Id: 13036812 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id BAB93C433FE for ; Tue, 8 Nov 2022 19:53:02 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 628A78E0008; Tue, 8 Nov 2022 14:53:02 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 5B1568E0001; Tue, 8 Nov 2022 14:53:02 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 452A08E0008; Tue, 8 Nov 2022 14:53:02 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 365B08E0001 for ; Tue, 8 Nov 2022 14:53:02 -0500 (EST) Received: from smtpin18.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 1B0191C6AA9 for ; Tue, 8 Nov 2022 19:53:02 +0000 (UTC) X-FDA: 80111323404.18.3BA49D8 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by imf11.hostedemail.com (Postfix) with ESMTP id A623140002 for ; Tue, 8 Nov 2022 19:53:01 +0000 (UTC) Received: from pwmachine.numericable.fr (85-170-25-210.rev.numericable.fr [85.170.25.210]) by linux.microsoft.com (Postfix) with ESMTPSA id E1FAA20B9F80; Tue, 8 Nov 2022 11:52:56 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com E1FAA20B9F80 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1667937180; bh=lfm7BTt/ROEPRbGDPE3vy0AJuoRZ1875JpNL6uMTfxU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Z6y0+aMF7SVBf0gFi1ICcf5FraX76ZRSz2ubkXhXtcPbw166bRHHw/TGxDIGh3txN SAQDO1pwq8hj3/PXrWZn3Uct6WoppsDGUInreNeOK8hBSmRrPvz9wrDBWvS0DhviDY 94IRSMcmuNH0IJPuoG0eAXnRTi0XMLf+eQc/qjrE= From: Francis Laniel To: linux-kernel@vger.kernel.org Cc: Alban Crequy , Alban Crequy , Francis Laniel , Andrew Morton , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Mykola Lysenko , Shuah Khan , linux-mm@kvack.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [RFC PATCH v1 2/2] selftests: bpf: add a test when bpf_probe_read_kernel_str() returns EFAULT Date: Tue, 8 Nov 2022 20:52:07 +0100 Message-Id: <20221108195211.214025-3-flaniel@linux.microsoft.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221108195211.214025-1-flaniel@linux.microsoft.com> References: <20221108195211.214025-1-flaniel@linux.microsoft.com> MIME-Version: 1.0 ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1667937181; a=rsa-sha256; cv=none; b=ZaJfUY22QxZHI+W24uvdcQr5aw6BOGQNdOWS1K07ZW3i076p+7BD3ewpGmbdWtL/tgdksB 2SZU4ex61r/won74r73+fRK/sbSq/iJP3jHuOdfFIEWe6UuCbcjw+383GIUE78UI3AlG6a g943xYPv0KoaY6yAoKcBdbmtObk4Byo= ARC-Authentication-Results: i=1; imf11.hostedemail.com; dkim=pass header.d=linux.microsoft.com header.s=default header.b=Z6y0+aMF; spf=pass (imf11.hostedemail.com: domain of flaniel@linux.microsoft.com designates 13.77.154.182 as permitted sender) smtp.mailfrom=flaniel@linux.microsoft.com; dmarc=pass (policy=none) header.from=linux.microsoft.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1667937181; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=lfm7BTt/ROEPRbGDPE3vy0AJuoRZ1875JpNL6uMTfxU=; b=afFO9RYk7p1eMN7SeQQavim+w0XxXNy4PiHFtG2jHdf2WGlYyzC78TeekEp8wNOVdClNqU mjjkeueSOifp4NyuwWXFF0JQ9+tdFIN6OjRv1xBNSfloxwwTLxtEZnKmHVZX8feBlnRgax kQNBxZJExB3J0OQXKIMawCi4PEp4Vng= Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=linux.microsoft.com header.s=default header.b=Z6y0+aMF; spf=pass (imf11.hostedemail.com: domain of flaniel@linux.microsoft.com designates 13.77.154.182 as permitted sender) smtp.mailfrom=flaniel@linux.microsoft.com; dmarc=pass (policy=none) header.from=linux.microsoft.com X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: A623140002 X-Stat-Signature: og7ixeki3ytyuy3rbpqujmxp3fmfpu4y X-HE-Tag: 1667937181-394582 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: Alban Crequy This commit tests previous fix of bpf_probe_read_kernel_str(). Signed-off-by: Alban Crequy Signed-off-by: Francis Laniel Acked-by: Yonghong Song --- tools/testing/selftests/bpf/prog_tests/varlen.c | 7 +++++++ tools/testing/selftests/bpf/progs/test_varlen.c | 5 +++++ 2 files changed, 12 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/varlen.c b/tools/testing/selftests/bpf/prog_tests/varlen.c index dd324b4933db..4d7056f8f177 100644 --- a/tools/testing/selftests/bpf/prog_tests/varlen.c +++ b/tools/testing/selftests/bpf/prog_tests/varlen.c @@ -63,6 +63,13 @@ void test_varlen(void) CHECK_VAL(data->total4, size1 + size2); CHECK(memcmp(data->payload4, exp_str, size1 + size2), "content_check", "doesn't match!\n"); + + CHECK_VAL(bss->ret_bad_read, -EFAULT); + CHECK_VAL(data->payload_bad[0], 0x42); + CHECK_VAL(data->payload_bad[1], 0x42); + CHECK_VAL(data->payload_bad[2], 0); + CHECK_VAL(data->payload_bad[3], 0x42); + CHECK_VAL(data->payload_bad[4], 0x42); cleanup: test_varlen__destroy(skel); } diff --git a/tools/testing/selftests/bpf/progs/test_varlen.c b/tools/testing/selftests/bpf/progs/test_varlen.c index 3987ff174f1f..20eb7d422c41 100644 --- a/tools/testing/selftests/bpf/progs/test_varlen.c +++ b/tools/testing/selftests/bpf/progs/test_varlen.c @@ -19,6 +19,7 @@ __u64 payload1_len1 = 0; __u64 payload1_len2 = 0; __u64 total1 = 0; char payload1[MAX_LEN + MAX_LEN] = {}; +__u64 ret_bad_read = 0; /* .data */ int payload2_len1 = -1; @@ -36,6 +37,8 @@ int payload4_len2 = -1; int total4= -1; char payload4[MAX_LEN + MAX_LEN] = { 1 }; +char payload_bad[5] = { 0x42, 0x42, 0x42, 0x42, 0x42 }; + SEC("raw_tp/sys_enter") int handler64_unsigned(void *regs) { @@ -61,6 +64,8 @@ int handler64_unsigned(void *regs) total1 = payload - (void *)payload1; + ret_bad_read = bpf_probe_read_kernel_str(payload_bad + 2, 1, (void *) -1); + return 0; }