From patchwork Fri Aug 23 19:51:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jordan Rome X-Patchwork-Id: 13775758 X-Patchwork-Delegate: bpf@iogearbox.net Received: from mout.perfora.net (mout.perfora.net [74.208.4.194]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0783B13634A for ; Fri, 23 Aug 2024 19:51:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.208.4.194 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724442691; cv=none; b=NvWHNfUgHXeCiqawggBnfwOFr+nkNmBksJNjWEOkxVqjT+BcTIE4s75X3uJaa15o6RiUYodwqgDxkFHBlDFQ1gEsmO+cBs3Ma4XE+QCYvxBboPb/6yrpCVwt5I/WXPav2D5KoimdLOHdY8O7q4yQ3zbrTdn7tJnOLLs7KoSfsEA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724442691; c=relaxed/simple; bh=3H5iE4cy/YOpQ54kPQqoWJgABWEihCzOo/Ch50CV1/8=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=GZwYQlCs8N+maKkK7iStAxEN8APb/6AcQIdU85XwC8pIdcf9xvvWkBCgvPiBC1n7WLMPhUVpK05zATdlmls8A7pHdcjdcrifcwPK2PpUQcllltv+RB5aL1lkzLneV/0L2ptJTk2+cfUsaTAWVkFLx8vQxRFvpPDVp/JvUnygIm4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=jordanrome.com; spf=pass smtp.mailfrom=jordanrome.com; dkim=pass (2048-bit key) header.d=jordanrome.com header.i=linux@jordanrome.com header.b=oWX0IXwH; arc=none smtp.client-ip=74.208.4.194 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=jordanrome.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=jordanrome.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=jordanrome.com header.i=linux@jordanrome.com header.b="oWX0IXwH" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=jordanrome.com; s=s1-ionos; t=1724442666; x=1725047466; i=linux@jordanrome.com; bh=k1uBaYGJROm7a2iGc9YsdSDsuksf5IABxkJs2FlbGfA=; h=X-UI-Sender-Class:From:To:Cc:Subject:Date:Message-ID: MIME-Version:Content-Transfer-Encoding:cc: content-transfer-encoding:content-type:date:from:message-id: mime-version:reply-to:subject:to; b=oWX0IXwHLtnlOfYcLILWkfPH0xwKClSvi1kTnuZxRLL1G87XoAE8wiW9jg4nXlz8 v4X5B0SZYZ8ZnCw/5ahRXPMpegDIyyYiBcjjnr1siRfTWGUzQONtue3Wds/4E20xk 89o8NJ3YzF4qERR8KhZ7CNvtpskqlBRe0s3kgJcE5M7T0uS4EzBku53/3pqkxk+G1 YB3d4ijjj57zI57V+a8kbC+aKfnAG5Lfuhho5uC1im7VFmBZeZrrP7QOTZGQSGUY/ oa5HE/JiqE6Wc5y7Y/WipYtGk2Oi6AfqsRsoJPKlWoe9SLxS1BM9juhgNP4W5ZTYL BEmPzXUWItc+uHFjUA== X-UI-Sender-Class: 55c96926-9e95-11ee-ae09-1f7a4046a0f6 Received: from localhost ([173.252.127.113]) by mrelay.perfora.net (mreueus002 [74.208.5.2]) with ESMTPSA (Nemesis) id 0MS4IG-1sX1fM1Ow6-00LbSt; Fri, 23 Aug 2024 21:51:06 +0200 From: Jordan Rome To: bpf@vger.kernel.org Cc: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Kernel Team , sinquersw@gmail.com Subject: [bpf-next v10 1/2] bpf: Add bpf_copy_from_user_str kfunc Date: Fri, 23 Aug 2024 12:51:00 -0700 Message-ID: <20240823195101.3621028-1-linux@jordanrome.com> X-Mailer: git-send-email 2.43.5 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Provags-ID: V03:K1:MFHgMTLG9dhQGL1die/0enUrqLu7klcxb2JM16BRkCwkK+v8cxW wRTF9GgDZAu3iXr8GhaXY2H6RWYpjOYQymIPvSIffMxnJHFMNVP2lNovJRPJ0ZYIWvWUkmC tGfowA+Wly3yVILj1/fPj2pIb7B+7or3Mt68+FmuRKf1ta+LhPGIeb6ZxDLYoD80Yp/B+wf pLDpn89s/ES9xxjVZ0bSA== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:NxA6y5UHDv0=;upumBywZf+h1iXcyMgqT+UKM95E CTvPjSabIHoXve3FozQ/+hNEoOvq/YOYTbdc4rA3hnHwuRUFQCuk6o7eCOC4fllhWsbU98paI ZRQogBIvwdbAhMOuaArvm5uFLSPEAP7Of0k1hK4kz8smB5Gj3HCiwpmq1rzaOHhaLVNL20esQ ZyYe5nJFMe+xMoerer++O60xu2Q+zDdfczUw05twYl1Qesu4lumS41XtoK2yq8E2j3Cg7UaUT MF7OL9S19gNiGMOci35waqwsn58IKP0Z3ZQjCAtpEfpvXdp/6bU/VUyagjd6Hw1AmkQLcBYRW uOARpzUAhflU3vwAptr0xH+gH/ULlN54aBiz/b/DBd4dBqdvaMrhKjsCn32Fiop+mwgVkfkDI xAqIczlUo8DHhBiGQRHGBxa4lMb6FBInDyLFZjt5aiE3RrXMx5wb5b9Mu9z3eGrashTj9upoD Ujf7fb9NjMDnenOiXk62S3Vka2OxehthPiD5/MGiERKxT3GnYO8vWqqP+lUpyOI73DrxThzh+ l1mPoZtee46JrQdnigEo8YqbdtBg2txGxeSf4f30jjHn1gVaifKPxbV3rVYGLzqnu+cYM9+RI lb9eBT07yQXgYNZRjSyoTehf4swccLT/Mlb7ou+mZjgFR2cEbHUPjgeFWXZdsezgXHEQhkBpj 6jh9wRx9cyqX5794blkP4jQpVcXHV+ti+tlaiApcHlnMkMVya+1rQnnAM+CfAIIfC2XOutmHJ hdbp/7C0mAOTif3PtsTNk7FQY2sBXdnRA== X-Patchwork-Delegate: bpf@iogearbox.net This adds a kfunc wrapper around strncpy_from_user, which can be called from sleepable BPF programs. This matches the non-sleepable 'bpf_probe_read_user_str' helper except it includes an additional 'flags' param, which allows consumers to clear the entire destination buffer on success or failure. Signed-off-by: Jordan Rome --- include/uapi/linux/bpf.h | 9 ++++++++ kernel/bpf/helpers.c | 42 ++++++++++++++++++++++++++++++++++ tools/include/uapi/linux/bpf.h | 9 ++++++++ 3 files changed, 60 insertions(+) -- 2.43.5 diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index e05b39e39c3f..1fb3cb2636e6 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -7513,4 +7513,13 @@ struct bpf_iter_num { __u64 __opaque[1]; } __attribute__((aligned(8))); +/* + * Flags to control BPF kfunc behaviour. + * - BPF_F_PAD_ZEROS: Pad destination buffer with zeros. (See the respective + * helper documentation for details.) + */ +enum bpf_kfunc_flags { + BPF_F_PAD_ZEROS = (1ULL << 0), +}; + #endif /* _UAPI__LINUX_BPF_H__ */ diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c index d02ae323996b..72cfc305d38a 100644 --- a/kernel/bpf/helpers.c +++ b/kernel/bpf/helpers.c @@ -2939,6 +2939,47 @@ __bpf_kfunc void bpf_iter_bits_destroy(struct bpf_iter_bits *it) bpf_mem_free(&bpf_global_ma, kit->bits); } +/** + * bpf_copy_from_user_str() - Copy a string from an unsafe user address + * @dst: Destination address, in kernel space. This buffer must be + * at least @dst__sz bytes long. + * @dst__sz: Maximum number of bytes to copy, includes the trailing NUL. + * @unsafe_ptr__ign: Source address, in user space. + * @flags: The only supported flag is BPF_F_PAD_ZEROS + * + * Copies a NUL-terminated string from userspace to BPF space. If user string is + * too long this will still ensure zero termination in the dst buffer unless + * buffer size is 0. + * + * If BPF_F_PAD_ZEROS flag is set, memset the tail of @dst to 0 on success and + * memset all of @dst on failure. + */ +__bpf_kfunc int bpf_copy_from_user_str(void *dst, u32 dst__sz, const void __user *unsafe_ptr__ign, u64 flags) +{ + int ret; + + if (unlikely(flags & ~BPF_F_PAD_ZEROS)) + return -EINVAL; + + if (unlikely(!dst__sz)) + return 0; + + ret = strncpy_from_user(dst, unsafe_ptr__ign, dst__sz - 1); + if (ret < 0) { + if (flags & BPF_F_PAD_ZEROS) + memset((char *)dst, 0, dst__sz); + + return ret; + } + + if (flags & BPF_F_PAD_ZEROS) + memset((char *)dst + ret, 0, dst__sz - ret); + else + ((char *)dst)[ret] = '\0'; + + return ret + 1; +} + __bpf_kfunc_end_defs(); BTF_KFUNCS_START(generic_btf_ids) @@ -3024,6 +3065,7 @@ BTF_ID_FLAGS(func, bpf_preempt_enable) BTF_ID_FLAGS(func, bpf_iter_bits_new, KF_ITER_NEW) BTF_ID_FLAGS(func, bpf_iter_bits_next, KF_ITER_NEXT | KF_RET_NULL) BTF_ID_FLAGS(func, bpf_iter_bits_destroy, KF_ITER_DESTROY) +BTF_ID_FLAGS(func, bpf_copy_from_user_str, KF_SLEEPABLE) BTF_KFUNCS_END(common_btf_ids) static const struct btf_kfunc_id_set common_kfunc_set = { diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index e05b39e39c3f..1fb3cb2636e6 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -7513,4 +7513,13 @@ struct bpf_iter_num { __u64 __opaque[1]; } __attribute__((aligned(8))); +/* + * Flags to control BPF kfunc behaviour. + * - BPF_F_PAD_ZEROS: Pad destination buffer with zeros. (See the respective + * helper documentation for details.) + */ +enum bpf_kfunc_flags { + BPF_F_PAD_ZEROS = (1ULL << 0), +}; + #endif /* _UAPI__LINUX_BPF_H__ */ From patchwork Fri Aug 23 19:51:01 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jordan Rome X-Patchwork-Id: 13775759 X-Patchwork-Delegate: bpf@iogearbox.net Received: from mout.perfora.net (mout.perfora.net [74.208.4.196]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CC84013634A for ; Fri, 23 Aug 2024 19:51:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.208.4.196 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724442698; cv=none; b=GN13EKLSnrJepEF4fQss3RFt8VrLrb/GaW4EENRGGBZwbRFaJp8txI6rBgQhxSwH0JUq7GmkfPV+ofnZsd9II2Y83z7OR89Q6cbJd9PK9TeAk/DcfIzRLAandsS7gnb1zgckGyEjUWA/BBLIuY9lhMfSdqrkgYPkKVjJR2SZ9r0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724442698; c=relaxed/simple; bh=UIWY8CUgR+ChXwgrY8eIrRpag+yHDXMUvGS8TimR7RE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FHs5ZS4UQ2ptxE2qA4PxHE2nhS3fk8ulXrNOY2z62NHMEjDy/OSSxgpO/H9HnMq0VJ0EAfoGEebwexMFhQjS81BsuzsmUwzFLDwX6/19AzZl4FnSmzmToH3kJzxYn5/E0+UvjPxGzkH9+vPkVbDb6Wm2vr42n+tVlMH4AiNBlII= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=jordanrome.com; spf=pass smtp.mailfrom=jordanrome.com; dkim=pass (2048-bit key) header.d=jordanrome.com header.i=linux@jordanrome.com header.b=qkrFlBkY; arc=none smtp.client-ip=74.208.4.196 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=jordanrome.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=jordanrome.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=jordanrome.com header.i=linux@jordanrome.com header.b="qkrFlBkY" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=jordanrome.com; s=s1-ionos; t=1724442670; x=1725047470; i=linux@jordanrome.com; bh=MsewBDRidr7nFmDzwg/oM7KefNCJ0MmdyCwQ7ligWhk=; h=X-UI-Sender-Class:From:To:Cc:Subject:Date:Message-ID:In-Reply-To: References:MIME-Version:Content-Transfer-Encoding:cc: content-transfer-encoding:content-type:date:from:message-id: mime-version:reply-to:subject:to; b=qkrFlBkY2KdwruJNEJd0s60XoleeHu13j32eCqxaFDAn5h/yzr/gEFV5EetpX4qC NXP/MDm5zl4AVyM5QJnHxpgIN+wvm/7u9xcdSosBcSIH7eomnE8kjTlPAcA9e9r8y J4q2lgQayqvSo3cYbyYBGzjFLakFHHgR07ZQDEh5YmjW0QT2/Ah+R8NnEt5pIYGvu wumkzzW+6peJFQODWeAjhGQv19wMpn3GFl/rRsWJ04F8AfxmjZuHkwOJJiV5Qn8t2 IteJRh2rVvlb5/YwVE5IwP7bxDL+AQhBAtTbv3bFkWVDRFcJpVcID5DEpTfmEHpYS cMzZ2/1dCy7tZVslLQ== X-UI-Sender-Class: 55c96926-9e95-11ee-ae09-1f7a4046a0f6 Received: from localhost ([173.252.127.27]) by mrelay.perfora.net (mreueus004 [74.208.5.2]) with ESMTPSA (Nemesis) id 1Mrgkq-1sMXIf34eC-00owYg; Fri, 23 Aug 2024 21:51:09 +0200 From: Jordan Rome To: bpf@vger.kernel.org Cc: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Kernel Team , sinquersw@gmail.com Subject: [bpf-next v10 2/2] bpf: Add tests for bpf_copy_from_user_str kfunc Date: Fri, 23 Aug 2024 12:51:01 -0700 Message-ID: <20240823195101.3621028-2-linux@jordanrome.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20240823195101.3621028-1-linux@jordanrome.com> References: <20240823195101.3621028-1-linux@jordanrome.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Provags-ID: V03:K1:UDiJl+qPbyKDBGs8yLTqkNOHyGuuZdV5rE0uVXIjtF6PEl05dhz cFKdFRWLyj/smJEoHGhsmkghY8IZLmctsh9xSuAzvbebQiK3zLpjPBEJL4Z3JwNGwsn6O2G su7nL0vJOb8LSaBXswb+6fLs/ZJ1jxFGDM4/TGx+/lHDWdwEhpz/nhQVE9ORPw5pcLd2DQ3 lhbRYir9TOf7Ey3hi8CmQ== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:dKgfPvO1PhI=;Hkse0eiHJZIJ+9YIYoeBfupiD4d 8FI4EOccmIwK52Os0R+dzU+GcYG8gMGxqNV6nlPVVH5kxAYD6ouHsrTnrULTiugn5a1IYMXeJ C8gBRIGPKECiKveOVuLV7GNSeEZ/dhavP2Ih3GDhDMvEUkvQcF3rwf/Fp8B6bk+7+hJXpmLMp uMjzTV24aaGzpqQzXFF+zOz9fTBsc1vQzdMmX0wBeUFzmLUHCG4PWNepmY63dbUNncchmT691 V/yKROXbuwftxVuRqIusUhiw1tHh6uD1csiXcBtI2hKj/WAbTpP6YQa3W5fn+CWu1iMBD1uH6 KAYDmmT2JcJneUNXt9Gw6vmVanWpO/OzSx4H15WFF2C15Lben9ISJCSjF9M4X1V74VzKigcau dWAGyNS5iT5Aeouubj612mRCi/KypuIDS9fVKzJykRhllCLsOV+8/lfNtNX5Vj2Vz4Jlu2XvJ mWDvaRCFkwWjYczl4iiA7FTDVeE4RV8ZAvUkN/o4f7oAHuUE+j1PIAfwgUL8kaVBXsfYOOjRP bkdZo/UgBMIts8uWTrrUn6BLUiUWocYWUeOxb8jBztXABq+oNjaqcQ9//U1TwR6DlnmI9Sv5e ATSaqMZOcqoVy+1wMrXJ1PYfG/VhUcF0OfueXYQJXncUztNAt7ydeZK/TSDZbJlt8WMqLGZct 2buXgqCmgWBVELBaZ6NnLZ24RYgkTO7EbTLyiRrH0UneeH5/dVC8lacM42TYocEjrGmS6l+3P P754mAjLmY0TRS8wDm4esEnH5kxwDz/tw== X-Patchwork-Delegate: bpf@iogearbox.net This adds tests for both the happy path and the error path. Signed-off-by: Jordan Rome --- .../selftests/bpf/prog_tests/attach_probe.c | 8 ++- .../selftests/bpf/prog_tests/read_vsyscall.c | 1 + .../selftests/bpf/progs/read_vsyscall.c | 9 ++- .../selftests/bpf/progs/test_attach_probe.c | 64 ++++++++++++++++++- 4 files changed, 75 insertions(+), 7 deletions(-) -- 2.43.5 diff --git a/tools/testing/selftests/bpf/prog_tests/attach_probe.c b/tools/testing/selftests/bpf/prog_tests/attach_probe.c index 7175af39134f..329c7862b52d 100644 --- a/tools/testing/selftests/bpf/prog_tests/attach_probe.c +++ b/tools/testing/selftests/bpf/prog_tests/attach_probe.c @@ -283,9 +283,11 @@ static void test_uprobe_sleepable(struct test_attach_probe *skel) trigger_func3(); ASSERT_EQ(skel->bss->uprobe_byname3_sleepable_res, 9, "check_uprobe_byname3_sleepable_res"); - ASSERT_EQ(skel->bss->uprobe_byname3_res, 10, "check_uprobe_byname3_res"); - ASSERT_EQ(skel->bss->uretprobe_byname3_sleepable_res, 11, "check_uretprobe_byname3_sleepable_res"); - ASSERT_EQ(skel->bss->uretprobe_byname3_res, 12, "check_uretprobe_byname3_res"); + ASSERT_EQ(skel->bss->uprobe_byname3_str_sleepable_res, 10, "check_uprobe_byname3_str_sleepable_res"); + ASSERT_EQ(skel->bss->uprobe_byname3_res, 11, "check_uprobe_byname3_res"); + ASSERT_EQ(skel->bss->uretprobe_byname3_sleepable_res, 12, "check_uretprobe_byname3_sleepable_res"); + ASSERT_EQ(skel->bss->uretprobe_byname3_str_sleepable_res, 13, "check_uretprobe_byname3_str_sleepable_res"); + ASSERT_EQ(skel->bss->uretprobe_byname3_res, 14, "check_uretprobe_byname3_res"); } void test_attach_probe(void) diff --git a/tools/testing/selftests/bpf/prog_tests/read_vsyscall.c b/tools/testing/selftests/bpf/prog_tests/read_vsyscall.c index 3405923fe4e6..c7b9ba8b1d06 100644 --- a/tools/testing/selftests/bpf/prog_tests/read_vsyscall.c +++ b/tools/testing/selftests/bpf/prog_tests/read_vsyscall.c @@ -23,6 +23,7 @@ struct read_ret_desc { { .name = "probe_read_user_str", .ret = -EFAULT }, { .name = "copy_from_user", .ret = -EFAULT }, { .name = "copy_from_user_task", .ret = -EFAULT }, + { .name = "copy_from_user_str", .ret = -EFAULT }, }; void test_read_vsyscall(void) diff --git a/tools/testing/selftests/bpf/progs/read_vsyscall.c b/tools/testing/selftests/bpf/progs/read_vsyscall.c index 986f96687ae1..39ebef430059 100644 --- a/tools/testing/selftests/bpf/progs/read_vsyscall.c +++ b/tools/testing/selftests/bpf/progs/read_vsyscall.c @@ -1,5 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 /* Copyright (C) 2024. Huawei Technologies Co., Ltd */ +#include "vmlinux.h" #include #include @@ -7,10 +8,15 @@ int target_pid = 0; void *user_ptr = 0; -int read_ret[8]; +int read_ret[9]; char _license[] SEC("license") = "GPL"; +/* + * This is the only kfunc, the others are helpers + */ +int bpf_copy_from_user_str(void *dst, u32, const void *, u64) __weak __ksym; + SEC("fentry/" SYS_PREFIX "sys_nanosleep") int do_probe_read(void *ctx) { @@ -40,6 +46,7 @@ int do_copy_from_user(void *ctx) read_ret[6] = bpf_copy_from_user(buf, sizeof(buf), user_ptr); read_ret[7] = bpf_copy_from_user_task(buf, sizeof(buf), user_ptr, bpf_get_current_task_btf(), 0); + read_ret[8] = bpf_copy_from_user_str((char *)buf, sizeof(buf), user_ptr, 0); return 0; } diff --git a/tools/testing/selftests/bpf/progs/test_attach_probe.c b/tools/testing/selftests/bpf/progs/test_attach_probe.c index 68466a6ad18c..fb79e6cab932 100644 --- a/tools/testing/selftests/bpf/progs/test_attach_probe.c +++ b/tools/testing/selftests/bpf/progs/test_attach_probe.c @@ -5,8 +5,10 @@ #include #include #include +#include #include "bpf_misc.h" +u32 dynamic_sz = 1; int kprobe2_res = 0; int kretprobe2_res = 0; int uprobe_byname_res = 0; @@ -14,11 +16,15 @@ int uretprobe_byname_res = 0; int uprobe_byname2_res = 0; int uretprobe_byname2_res = 0; int uprobe_byname3_sleepable_res = 0; +int uprobe_byname3_str_sleepable_res = 0; int uprobe_byname3_res = 0; int uretprobe_byname3_sleepable_res = 0; +int uretprobe_byname3_str_sleepable_res = 0; int uretprobe_byname3_res = 0; void *user_ptr = 0; +int bpf_copy_from_user_str(void *dst, u32, const void *, u64) __weak __ksym; + SEC("ksyscall/nanosleep") int BPF_KSYSCALL(handle_kprobe_auto, struct __kernel_timespec *req, struct __kernel_timespec *rem) { @@ -87,11 +93,61 @@ static __always_inline bool verify_sleepable_user_copy(void) return bpf_strncmp(data, sizeof(data), "test_data") == 0; } +static __always_inline bool verify_sleepable_user_copy_str(void) +{ + int ret; + char data_long[20]; + char data_long_pad[20]; + char data_long_err[20]; + char data_short[4]; + char data_short_pad[4]; + + ret = bpf_copy_from_user_str(data_short, sizeof(data_short), user_ptr, 0); + + if (bpf_strncmp(data_short, 4, "tes\0") != 0 || ret != 4) + return false; + + ret = bpf_copy_from_user_str(data_short_pad, sizeof(data_short_pad), user_ptr, BPF_F_PAD_ZEROS); + + if (bpf_strncmp(data_short, 4, "tes\0") != 0 || ret != 4) + return false; + + /* Make sure this passes the verifier */ + ret = bpf_copy_from_user_str(data_long, dynamic_sz & sizeof(data_long), user_ptr, 0); + + if (ret != 0) + return false; + + ret = bpf_copy_from_user_str(data_long, sizeof(data_long), user_ptr, 0); + + if (bpf_strncmp(data_long, 10, "test_data\0") != 0 || ret != 10) + return false; + + ret = bpf_copy_from_user_str(data_long_pad, sizeof(data_long_pad), user_ptr, BPF_F_PAD_ZEROS); + + if (bpf_strncmp(data_long_pad, 10, "test_data\0") != 0 || ret != 10 || data_long_pad[19] != '\0') + return false; + + ret = bpf_copy_from_user_str(data_long_err, sizeof(data_long_err), (void *)data_long, BPF_F_PAD_ZEROS); + + if (ret > 0 || data_long_err[19] != '\0') + return false; + + ret = bpf_copy_from_user_str(data_long, sizeof(data_long), user_ptr, 2); + + if (ret != -EINVAL) + return false; + + return true; +} + SEC("uprobe.s//proc/self/exe:trigger_func3") int handle_uprobe_byname3_sleepable(struct pt_regs *ctx) { if (verify_sleepable_user_copy()) uprobe_byname3_sleepable_res = 9; + if (verify_sleepable_user_copy_str()) + uprobe_byname3_str_sleepable_res = 10; return 0; } @@ -102,7 +158,7 @@ int handle_uprobe_byname3_sleepable(struct pt_regs *ctx) SEC("uprobe//proc/self/exe:trigger_func3") int handle_uprobe_byname3(struct pt_regs *ctx) { - uprobe_byname3_res = 10; + uprobe_byname3_res = 11; return 0; } @@ -110,14 +166,16 @@ SEC("uretprobe.s//proc/self/exe:trigger_func3") int handle_uretprobe_byname3_sleepable(struct pt_regs *ctx) { if (verify_sleepable_user_copy()) - uretprobe_byname3_sleepable_res = 11; + uretprobe_byname3_sleepable_res = 12; + if (verify_sleepable_user_copy_str()) + uretprobe_byname3_str_sleepable_res = 13; return 0; } SEC("uretprobe//proc/self/exe:trigger_func3") int handle_uretprobe_byname3(struct pt_regs *ctx) { - uretprobe_byname3_res = 12; + uretprobe_byname3_res = 14; return 0; }