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Wed, 10 Jun 2020 23:31:34 +0000 (UTC) (envelope-from jkim@FreeBSD.org) Received: from freefall.freebsd.org (static-71-168-218-4.cmdnnj.fios.verizon.net [71.168.218.4]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client did not present a certificate) (Authenticated sender: jkim/mail) by smtp.freebsd.org (Postfix) with ESMTPSA id 9A3D115F7E; Wed, 10 Jun 2020 23:31:34 +0000 (UTC) (envelope-from jkim@FreeBSD.org) Subject: Re: [PATCH] ACPICA: fix UBSAN warning using __builtin_offsetof To: "Kaneda, Erik" , Nick Desaulniers , "Moore, Robert" , "Wysocki, Rafael J" , Len Brown References: <20200601231805.207441-1-ndesaulniers@google.com> From: Jung-uk Kim Autocrypt: addr=jkim@FreeBSD.org; keydata= mQENBFJBztUBCAChqNyGqmFuNo0U7MBzsD+q/G6Cv0l7LGVrOAsgh34M8wIWhD+tztDWMVfn AhxNDd0ceCj2bYOe67sTQxAScEcbt2FfvPOLp9MEXb9qohZj172Gwkk7dnhOhZZKhVGVZKM4 NcsuBDUzgf4f3Vdzj4wg6WlqplnTZo8lPE4hZWvZHoFIyunPTJWenybeV1xnxK7JkUdSvQR0 fA59RfTTECMwTrSEfYGUnxIDBraxJ7Ecs/0hGQ7sljIj8WBvlRDU5fU1xfF35aw56T8POQRq F4E6RVJW3YGuTpSwgtGZOTfygcLRhAiq3dFC3JNLaTVTpM8PjOinJyt9AU6RoITGOKwDABEB AAG0Hkp1bmctdWsgS2ltIDxqa2ltQEZyZWVCU0Qub3JnPokBPQQTAQoAJwUCUkHO1QIbAwUJ E0/POwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgAAKCRB8n5Ym/NvxRqyzB/wL7QtsIpeGfGIA ZPMtgXMucM3NWzomyQMln2j2efUkDKthzh9jBxgF53TjOr7imwIt0PT2k1bqctPrq5IRqnu9 mGroqaCLE3LG2/E3jEaao4k9PO6efwlioyivUo5NrqIQOQ4k3EAXw7d2y0Dk1VpTgdMrnUAB hj7lGlLqS4ydcrf24DdbCRGdEQwqd9DBeBgbWynxAJMgbZBhYVEyIHuQKkJ8qY0ibIPXXuF0 KYDeH0qUHtWV2K3srNyPtymUkBQD84Pl1GWRYx05XdUHDmnX0JV3lg0BfYJZgZv0ehPQrMfY Fd9abTkf9FHQYz1JtsC8wUuRgqElRd6+YAGf8Tt9uQENBFJBztUBCADLtSrP44El2VoJmH14 OFrlOgxzZnbn+Y/Gf1k12mJBiR+A+pBeRLD50p7AiTrjHRxO3cHcl9Dh0uf1VSbXgp8Or0ye iP/86fZPd4k5HXNmDTLL0HecPE08SCqGZ0W8vllQrokB1QxxRUB+fFMPJyMCjDAZ7P9fFTOS dTw1bJSTtOD8Sx8MpZUa9ti06bXFlVYDlaqSdgk181SSx+ZbSKkQR8CIMARlHwiLsa3Z9q9O EJr20HPyxe0AlTvwvFndH61hg7ds63eRvglwRnNON28VXO/lvKXq7Br/CiiyhFdKfINIx2Z5 htYq22tgGTW7mBURbIKoECFBTX9Lv6BXz6w9ABEBAAGJASUEGAEKAA8FAlJBztUCGwwFCRNP zzsACgkQfJ+WJvzb8UZcJQf+IsTCxUEqY7W/pT84sMg5/QD3s6ufTRncvq14fEOxCNq1Rf4Q 9P+tOFa8GZfKDGB2BFGIrW7uT5mlmKdK1vO6ZIA930y5kUsnCmBUEBJkE2ciSQk01aB/1o62 Q3Gk/F6BwtNY9OXiqF7AcAo+K/BMIaqb26QKeh+IIgK1NN9dQiq3ByTbl4zpGZa6MmsnnRTu mzGKt2nkz7vBzH6+hZp1OzGZikgjjhYWVFoJo1dvf/rv4obs0ZJEqFPQs/1Qa1dbkKBv6odB XJpPH0ssOluTY24d1XxTiKTwmWvHeQkOKRAIfD7VTtF4TesoZYkf7hsh3e3VwXhptSLFnEOi WwYofg== Organization: FreeBSD.org Message-ID: Date: Wed, 10 Jun 2020 19:31:30 -0400 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200610_163139_699209_85491368 X-CRM114-Status: GOOD ( 19.14 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "mark.rutland@arm.com" , "lorenzo.pieralisi@arm.com" , "will@kernel.org" , "rjw@rjwysocki.net" , "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" , "linux-acpi@vger.kernel.org" , "glider@google.com" , "dvyukov@google.com" , "guohanjun@huawei.com" , "pcc@google.com" , Ard Biesheuvel , "linux-arm-kernel@lists.infradead.org" , "devel@acpica.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 20. 6. 10., Kaneda, Erik wrote: > +JKim (for FreeBSD's perspective) > >> -----Original Message----- >> From: Nick Desaulniers >> Sent: Monday, June 1, 2020 4:18 PM >> To: Moore, Robert ; Kaneda, Erik >> ; Wysocki, Rafael J ; >> Len Brown >> Cc: Ard Biesheuvel ; dvyukov@google.com; >> glider@google.com; guohanjun@huawei.com; linux-arm- >> kernel@lists.infradead.org; linux-kernel@vger.kernel.org; >> lorenzo.pieralisi@arm.com; mark.rutland@arm.com; >> ndesaulniers@google.com; pcc@google.com; rjw@rjwysocki.net; >> will@kernel.org; stable@vger.kernel.org; linux-acpi@vger.kernel.org; >> devel@acpica.org >> Subject: [PATCH] ACPICA: fix UBSAN warning using __builtin_offsetof >> >> Will reported UBSAN warnings: >> UBSAN: null-ptr-deref in drivers/acpi/acpica/tbfadt.c:459:37 >> UBSAN: null-ptr-deref in arch/arm64/kernel/smp.c:596:6 >> > Hi, > >> Looks like the emulated offsetof macro ACPI_OFFSET is causing these. We >> can avoid this by using the compiler builtin, __builtin_offsetof. >> > This doesn't really fly because __builtin_offsetof is a compiler extension. > > It looks like a lot of stddef.h files do this: > > #define offsetof(a,b) __builtin_offset(a,b) > > So does anyone have objections to ACPI_OFFSET being defined to offsetof()? > > This will allow a host OS project project to use their own definitions of offsetof in place of ACPICA's. > If they don't have a definition for offsetof, we can supply the old one as a fallback. > > Here's a patch: > > --- a/include/acpi/actypes.h > +++ b/include/acpi/actypes.h > @@ -504,11 +504,17 @@ typedef u64 acpi_integer; > #define ACPI_SUB_PTR(t, a, b) ACPI_CAST_PTR (t, (ACPI_CAST_PTR (u8, (a)) - (acpi_size)(b))) > #define ACPI_PTR_DIFF(a, b) ((acpi_size) (ACPI_CAST_PTR (u8, (a)) - ACPI_CAST_PTR (u8, (b)))) > > +/* Use an existing definiton for offsetof */ > + > +#ifndef offsetof > +#define offsetof(d,f) ACPI_PTR_DIFF (&(((d *) 0)->f), (void *) 0) > +#endif > + > /* Pointer/Integer type conversions */ > > #define ACPI_TO_POINTER(i) ACPI_CAST_PTR (void, (acpi_size) (i)) > #define ACPI_TO_INTEGER(p) ACPI_PTR_DIFF (p, (void *) 0) > -#define ACPI_OFFSET(d, f) ACPI_PTR_DIFF (&(((d *) 0)->f), (void *) 0) > +#define ACPI_OFFSET(d, f) offsetof (d,f) > #define ACPI_PHYSADDR_TO_PTR(i) ACPI_TO_POINTER(i) > #define ACPI_PTR_TO_PHYSADDR(i) ACPI_TO_INTEGER(i) LGTM. Jung-uk Kim >> The non-kernel runtime of UBSAN would print: >> runtime error: member access within null pointer of type for this macro. >> >> Link: https://lore.kernel.org/lkml/20200521100952.GA5360@willie-the-truck/ >> Cc: stable@vger.kernel.org >> Reported-by: Will Deacon >> Suggested-by: Ard Biesheuvel >> Signed-off-by: Nick Desaulniers >> --- >> include/acpi/actypes.h | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h index >> 4defed58ea33..04359c70b198 100644 >> --- a/include/acpi/actypes.h >> +++ b/include/acpi/actypes.h >> @@ -508,7 +508,7 @@ typedef u64 acpi_integer; >> >> #define ACPI_TO_POINTER(i) ACPI_CAST_PTR (void, (acpi_size) (i)) >> #define ACPI_TO_INTEGER(p) ACPI_PTR_DIFF (p, (void *) 0) >> -#define ACPI_OFFSET(d, f) ACPI_PTR_DIFF (&(((d *) 0)->f), (void *) >> 0) >> +#define ACPI_OFFSET(d, f) __builtin_offsetof(d, f) >> #define ACPI_PHYSADDR_TO_PTR(i) ACPI_TO_POINTER(i) >> #define ACPI_PTR_TO_PHYSADDR(i) ACPI_TO_INTEGER(i) >> >> -- >> 2.27.0.rc2.251.g90737beb825-goog > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel