From nobody Mon Sep 28 06:34:44 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 B64483F86EE; Tue, 25 Aug 2026 09:55:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787651730; cv=none; b=eXuTXskYvAfa0m4pVrAtYCp4n9BnHCNdVQoMsaXLcmZJYGJAlp8Ix8PpU93L/uL995KmxXg7ZNKkA3cf4m4MpwIE+yrrhhoCCjPixwX8axoYn+qgwpEk0+NEbntiLVdoJmeNntVT8TMsh9o+jwFOFfJrPognfm6qMP/QUT8PbnY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787651730; c=relaxed/simple; bh=OscypHFrJFm+ZYXSCBm6lKLesfyBY4e8glY4nGsqzEo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Uax2uAI7hQvpSjUx8hNnbqhJBDEnbQhzgAspw3t2jOakBYKmQfZz5LDcYjdH/TJaUTlYF8Z5wZAdqfceprp8di8z9TZbJr6MptvMyaCA8DRbFnPtPxuAInFuBMdElbbNOkDAkqo/WQhKZ/J8p37iS0oIV/un0AJqL8bIomU2A6E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=e25e954N; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="e25e954N" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D65AA1F00A3A; Tue, 25 Aug 2026 09:55:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1787651727; bh=Q+1vqyZOB06Y8gMGMiT8CtnV3r2AYsSOBSqg94mj4xI=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=e25e954NVzdeFu84oqogrSygmrsESPwCq8loM/wntYOOlQFb2Bn3/naRUHYygslxP 3BdqqFH+NUQ3lkMdLoGH2ke8uw89PSCIYN1nHUq83R9ewlwfaiC243V66H8JRsCCqE zjDLX2oycn3G65D9NlO2Yr85NnPr4T86KoPw/b7uBckZyctQngYhbfo3bQIYBWaTlV 4U2P6B1e12hntNInWjpwkcEl0INiJDOscaLsUKvbtEQRz/wchUsEamoLFF0Z2OC7A6 U5ULFQqhgevCXRqU30uDlyE1EK7N9honYkr+BwKP67p8IyLQ0gmXwwVSH4F2jYGSxc WnRtkeyYJOBZA== From: Benjamin Tissoires Date: Tue, 25 Aug 2026 11:55:11 +0200 Subject: [PATCH v2 1/3] HID: bpf: mark struct hid_device as safe BPF pointer Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260825-wip-bpf-safe-v2-1-d044355c09d8@kernel.org> References: <20260825-wip-bpf-safe-v2-0-d044355c09d8@kernel.org> In-Reply-To: <20260825-wip-bpf-safe-v2-0-d044355c09d8@kernel.org> To: Jiri Kosina , Shuah Khan , Daniel Borkmann Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, Benjamin Tissoires X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1787651723; l=1265; i=bentiss@kernel.org; s=20230215; h=from:subject:message-id; bh=OscypHFrJFm+ZYXSCBm6lKLesfyBY4e8glY4nGsqzEo=; b=r7XzpBdOuF8J7iCUpGjVdJFQl87GL3hAev2bXaFNJrefEr5O3/y573A3spyRV9YO56ROdLRvd 8dNEyOePJDjDH0H8uNBR2S/ZLubiYbCynoR6UbAiru/rxs9At78cOwV X-Developer-Key: i=bentiss@kernel.org; a=ed25519; pk=7D1DyAVh6ajCkuUTudt/chMuXWIJHlv2qCsRkIizvFw= Commit ee9ad135b208 ("bpf: Reject a store through a fault prone pointer") in the BPF tree makes the verifier reject any writes to hid_device->{name,uniq,phys}. A simple solution is to mark the struct hid_device as safe from a BPF point of view. Suggested-by: Daniel Borkmann Signed-off-by: Benjamin Tissoires --- drivers/hid/bpf/hid_bpf_struct_ops.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/hid/bpf/hid_bpf_struct_ops.c b/drivers/hid/bpf/hid_bpf= _struct_ops.c index 702c22fae136..56c53aca4511 100644 --- a/drivers/hid/bpf/hid_bpf_struct_ops.c +++ b/drivers/hid/bpf/hid_bpf_struct_ops.c @@ -62,6 +62,10 @@ struct hid_bpf_offset_write_range { u32 end; }; =20 +struct hid_bpf_ctx__safe_trusted { + struct hid_device *hid; +}; + static int hid_bpf_ops_btf_struct_access(struct bpf_verifier_log *log, const struct bpf_reg_state *reg, int off, int size) @@ -86,6 +90,8 @@ static int hid_bpf_ops_btf_struct_access(struct bpf_verif= ier_log *log, const char *cur =3D NULL; int i; =20 + BTF_TYPE_EMIT(struct hid_bpf_ctx__safe_trusted); + t =3D btf_type_by_id(reg->btf, reg->btf_id); =20 for (i =3D 0; i < ARRAY_SIZE(write_ranges); i++) { --=20 2.55.0 From nobody Mon Sep 28 06:34:44 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 925403F9280; Tue, 25 Aug 2026 09:55:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787651730; cv=none; b=IfJtSHyHG0HrgD1JwauWmIFZAg12+kmkEbz9Zu/JYtTTaDq78HcIWGMWN/oLjsj7YVUoH2Xz9wmsae9Ymg5J/FwgENC0FwXnLvkOfkG4WzbjtxGxSqvsui5gV4W8l3xTGB6ffC2451WVxKdwjxpie9rD3sHNOH0JG6iNoi05QWM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787651730; c=relaxed/simple; bh=P2KQ/vyTrdHO6s9F0ZWZjYHFLaT52t9NCZb6L0bqJhg=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=AhJG4ZyMkw6fVtHveqVBdTRX+ew23IK2C0Ln3lCdls7Vq85zugtlxUirTpxL1r/dyX7cScI/yoyYeHCLB3UG7/Pn6n9m+vnlAjV1CeZhvpkGItPBd/Db+p/ewSz3sYFckJj1V6alp4wLA96NkecJyUNMz0BEFwfJExwvQ03sgQc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CpOn7g0s; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CpOn7g0s" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C092E1F000E9; Tue, 25 Aug 2026 09:55:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1787651729; bh=aOutTEc1i+OTXu+DEaWvTQVVwS39UPOhxfXFCuwBi7c=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=CpOn7g0soseDua5adXULlXuFReWZDcNtM8Qj/nw3rXWmlGUBPGYRaBK0Ms9iW420U Hrjuh95prE619/cZroq3m7x6Ty5wueSW5jFDfANftb59/w+/WblH6cdqB5in3glHqq RlrS4ZucOIWRp72HGkPvdoFUeHWYIF2RsPXS5LViTocH607fHhMOrYm3qj8fusYRjO qQDfqDOX3kc4sjZlUMHE/4NdM/5ds7N9FY59W1IQfDy+vd1I0/xE88IU8Lk00X67/R NntRmhpKk2k2oJffrizujPKIOiEOojIcbyu0gC0EsRiq/H7Jxj23kIS1FC93jYkAd2 RwUOMaUxte9Dw== From: Benjamin Tissoires Date: Tue, 25 Aug 2026 11:55:12 +0200 Subject: [PATCH v2 2/3] selftests/hid: Add a test to ensure we can write fields in hid_device Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260825-wip-bpf-safe-v2-2-d044355c09d8@kernel.org> References: <20260825-wip-bpf-safe-v2-0-d044355c09d8@kernel.org> In-Reply-To: <20260825-wip-bpf-safe-v2-0-d044355c09d8@kernel.org> To: Jiri Kosina , Shuah Khan , Daniel Borkmann Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, Benjamin Tissoires X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1787651723; l=3670; i=bentiss@kernel.org; s=20230215; h=from:subject:message-id; bh=P2KQ/vyTrdHO6s9F0ZWZjYHFLaT52t9NCZb6L0bqJhg=; b=Q2B1gXkhHSFe+nXeMCFMbz0MToK1ota0semx5OoZZdLOtg64MZFDl9rDK58N7ChOwHhK+xB4e JuKMWbMar1xD4HgvIHNveWHSRFhJmoRzjywSvYbvIN8Gu232EXCvNfW X-Developer-Key: i=bentiss@kernel.org; a=ed25519; pk=7D1DyAVh6ajCkuUTudt/chMuXWIJHlv2qCsRkIizvFw= hid_device->{name,uniq,phys} are all writeable fields, we need to have tests for them in case the verifier becomes too much strict. Signed-off-by: Benjamin Tissoires --- changes in v2: - sashiko fixes: - iterate the for loop up to 5, to account for dev_id >=3D 1000 - properly undef the correct macro --- tools/testing/selftests/hid/hid_bpf.c | 26 ++++++++++++++++++= ++++ tools/testing/selftests/hid/progs/hid.c | 26 ++++++++++++++++++= ++++ .../testing/selftests/hid/progs/hid_bpf_helpers.h | 3 +++ 3 files changed, 55 insertions(+) diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftest= s/hid/hid_bpf.c index b851339308c2..069ebdbb4d1c 100644 --- a/tools/testing/selftests/hid/hid_bpf.c +++ b/tools/testing/selftests/hid/hid_bpf.c @@ -909,6 +909,32 @@ TEST_F(hid_bpf, test_rdesc_fixup_get_data_overflow) ASSERT_EQ(self->skel->bss->get_data_overflow_check, 1); } =20 +TEST_F(hid_bpf, test_rdesc_fixup_change_uniq_name_phys) +{ + const struct test_program progs[] =3D { + { .name =3D "hid_rdesc_fixup_change_uniq_name_phys" }, + }; + char expected[256], buf[256] =3D {}; + int err; + + LOAD_PROGRAMS(progs); + + err =3D ioctl(self->hidraw_fd, HIDIOCGRAWNAME(sizeof(buf)), buf); + ASSERT_GE(err, 0) TH_LOG("HIDIOCGRAWNAME"); + ASSERT_STREQ("name coming from bpf", buf); + + snprintf(expected, sizeof(expected), "%d phys:coming:from:bpf", self->hid= .dev_id); + + err =3D ioctl(self->hidraw_fd, HIDIOCGRAWPHYS(sizeof(buf)), buf); + ASSERT_GE(err, 0) TH_LOG("HIDIOCGRAWPHYS"); + ASSERT_STREQ(expected, buf); + + err =3D ioctl(self->hidraw_fd, HIDIOCGRAWUNIQ(sizeof(buf)), buf); + ASSERT_GE(err, 0) TH_LOG("HIDIOCGRAWUNIQ"); + ASSERT_STREQ("uniq:coming:from:bpf", buf); + +} + static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args) { diff --git a/tools/testing/selftests/hid/progs/hid.c b/tools/testing/selfte= sts/hid/progs/hid.c index b21fbb13c926..361dc7eaad22 100644 --- a/tools/testing/selftests/hid/progs/hid.c +++ b/tools/testing/selftests/hid/progs/hid.c @@ -255,6 +255,32 @@ struct hid_bpf_ops rdesc_fixup_get_data_overflow =3D { .hid_rdesc_fixup =3D (void *)hid_rdesc_fixup_get_data_overflow, }; =20 +SEC("?struct_ops.s/hid_rdesc_fixup") +int BPF_PROG(hid_rdesc_fixup_change_uniq_name_phys, struct hid_bpf_ctx *hi= d_ctx) +{ +#define HID_BPF_MEMCPY(target, str) \ + __builtin_memcpy(target, str, sizeof(str)) + + HID_BPF_MEMCPY(hid_ctx->hid->name, "name coming from bpf"); + HID_BPF_MEMCPY(hid_ctx->hid->uniq, "uniq:coming:from:bpf"); + /* hid_bpf relies on a phys being a rand % 1024 */ + for (int i =3D 0; i < 5; i++) { + if (!hid_ctx->hid->phys[i]) { + HID_BPF_MEMCPY(hid_ctx->hid->phys + i, " phys:coming:from:bpf"); + break; + } + } + +#undef HID_BPF_MEMCPY + + return 0; +} + +SEC(".struct_ops.link") +struct hid_bpf_ops rdesc_fixup_change_uniq_name_phys =3D { + .hid_rdesc_fixup =3D (void *)hid_rdesc_fixup_change_uniq_name_phys, +}; + SEC("?struct_ops/hid_device_event") int BPF_PROG(hid_test_insert1, struct hid_bpf_ctx *hid_ctx, enum hid_repor= t_type type) { diff --git a/tools/testing/selftests/hid/progs/hid_bpf_helpers.h b/tools/te= sting/selftests/hid/progs/hid_bpf_helpers.h index cdca912f3afd..05698793762a 100644 --- a/tools/testing/selftests/hid/progs/hid_bpf_helpers.h +++ b/tools/testing/selftests/hid/progs/hid_bpf_helpers.h @@ -61,6 +61,9 @@ enum hid_report_type { =20 struct hid_device { unsigned int id; + char name[128]; + char phys[64]; + char uniq[64]; } __attribute__((preserve_access_index)); =20 struct bpf_wq { --=20 2.55.0 From nobody Mon Sep 28 06:34:44 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 67C413F9A13; Tue, 25 Aug 2026 09:55:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787651732; cv=none; b=l/KgsjYYW2VsoIVl8pcEXr0tf/KanNuAoqDayRvJhoUtIRIINTV+aIJez7OLDxEVHtjXkDhjF/elBZUrSxhrcpvsX5N0ZBtutUj9yaeWCKpkFn3vpauFKAfniBoLe4x6UO8H7c3lhCRZIuUse+Uu8tWGKVzsom6af12VpO1Bngo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787651732; c=relaxed/simple; bh=eSEf0NJ/FDzTZdK6KbIhOnTFJmviX53xcLE5mdfpiqM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260825-wip-bpf-safe-v2-3-d044355c09d8@kernel.org> References: <20260825-wip-bpf-safe-v2-0-d044355c09d8@kernel.org> In-Reply-To: <20260825-wip-bpf-safe-v2-0-d044355c09d8@kernel.org> To: Jiri Kosina , Shuah Khan , Daniel Borkmann Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, Benjamin Tissoires X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1787651723; l=2813; i=bentiss@kernel.org; s=20230215; h=from:subject:message-id; bh=eSEf0NJ/FDzTZdK6KbIhOnTFJmviX53xcLE5mdfpiqM=; b=Tl3rtj8QfIhNkymGgKEWgE/7jpo3QHfOjMvQGI8TZhjXg573kAwO6lieRPewg7aj71cva2UU5 amC2fx4gIpKB7RXRfi7NMCUnS8a+eMXE2JQsETMGRC/kiQ41cOmjRUa X-Developer-Key: i=bentiss@kernel.org; a=ed25519; pk=7D1DyAVh6ajCkuUTudt/chMuXWIJHlv2qCsRkIizvFw= The new verifier in the bpf-next branch is now capable of detecting the overflow that was triggered by test_rdesc_fixup_get_data_overflow. This is better in terms of UI, but now the test is failing and should be marked as expected to fail. Add a new parameter to load_programs() when we expect the test to fail, and dynamically validate the test by checkcing if it loads (it should fail to load with new verifier), but if it still loads, HID-BPF should detect the overflow itself and return an error in hid_bpf_get_data(). Signed-off-by: Benjamin Tissoires --- tools/testing/selftests/hid/hid_bpf.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/tools/testing/selftests/hid/hid_bpf.c b/tools/testing/selftest= s/hid/hid_bpf.c index 069ebdbb4d1c..7ab86296ff23 100644 --- a/tools/testing/selftests/hid/hid_bpf.c +++ b/tools/testing/selftests/hid/hid_bpf.c @@ -67,14 +67,17 @@ struct test_program { int insert_head; }; #define LOAD_PROGRAMS(progs) \ - load_programs(progs, ARRAY_SIZE(progs), _metadata, self, variant) + load_programs(progs, ARRAY_SIZE(progs), false, _metadata, self, variant) +#define LOAD_PROGRAMS_MAY_FAIL(progs) \ + load_programs(progs, ARRAY_SIZE(progs), true, _metadata, self, variant) #define LOAD_BPF \ - load_programs(NULL, 0, _metadata, self, variant) -static void load_programs(const struct test_program programs[], - const size_t progs_count, - struct __test_metadata *_metadata, - FIXTURE_DATA(hid_bpf) * self, - const FIXTURE_VARIANT(hid_bpf) * variant) + load_programs(NULL, 0, false, _metadata, self, variant) +static int load_programs(const struct test_program programs[], + const size_t progs_count, + bool load_may_fail, + struct __test_metadata *_metadata, + FIXTURE_DATA(hid_bpf) * self, + const FIXTURE_VARIANT(hid_bpf) * variant) { struct bpf_map *iter_map; int err =3D -EINVAL; @@ -128,6 +131,9 @@ static void load_programs(const struct test_program pro= grams[], } =20 err =3D hid__load(self->skel); + if (err && load_may_fail) + return err; + ASSERT_OK(err) TH_LOG("hid_skel_load failed: %d", err); =20 for (int i =3D 0; i < progs_count; i++) { @@ -147,6 +153,7 @@ static void load_programs(const struct test_program pro= grams[], =20 self->hidraw_fd =3D open_hidraw(&self->hid); ASSERT_GE(self->hidraw_fd, 0) TH_LOG("open_hidraw"); + return 0; } =20 /* @@ -904,7 +911,9 @@ TEST_F(hid_bpf, test_rdesc_fixup_get_data_overflow) { .name =3D "hid_rdesc_fixup_get_data_overflow" }, }; =20 - LOAD_PROGRAMS(progs); + /* newer verifier can detect the overflow at load time */ + if (LOAD_PROGRAMS_MAY_FAIL(progs)) + return; =20 ASSERT_EQ(self->skel->bss->get_data_overflow_check, 1); } --=20 2.55.0