linux-kernel - Re: [PATCH v5 04/19] x86: Add arch specific kasan functions

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <60b9d835-b164-4775-b9b4-64a523c98879@gmail.com>
Date: Thu, 18 Sep 2025 17:52:39 +0200
From: Andrey Ryabinin <ryabinin.a.a@...il.com>
To: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
 sohil.mehta@...el.com, baohua@...nel.org, david@...hat.com,
 kbingham@...nel.org, weixugc@...gle.com, Liam.Howlett@...cle.com,
 alexandre.chartre@...cle.com, kas@...nel.org, mark.rutland@....com,
 trintaeoitogc@...il.com, axelrasmussen@...gle.com, yuanchu@...gle.com,
 joey.gouly@....com, samitolvanen@...gle.com, joel.granados@...nel.org,
 graf@...zon.com, vincenzo.frascino@....com, kees@...nel.org,
 ardb@...nel.org, thiago.bauermann@...aro.org, glider@...gle.com,
 thuth@...hat.com, kuan-ying.lee@...onical.com, pasha.tatashin@...een.com,
 nick.desaulniers+lkml@...il.com, vbabka@...e.cz, kaleshsingh@...gle.com,
 justinstitt@...gle.com, catalin.marinas@....com,
 alexander.shishkin@...ux.intel.com, samuel.holland@...ive.com,
 dave.hansen@...ux.intel.com, corbet@....net, xin@...or.com,
 dvyukov@...gle.com, tglx@...utronix.de, scott@...amperecomputing.com,
 jason.andryuk@....com, morbo@...gle.com, nathan@...nel.org,
 lorenzo.stoakes@...cle.com, mingo@...hat.com, brgerst@...il.com,
 kristina.martsenko@....com, bigeasy@...utronix.de, luto@...nel.org,
 jgross@...e.com, jpoimboe@...nel.org, urezki@...il.com, mhocko@...e.com,
 ada.coupriediaz@....com, hpa@...or.com, leitao@...ian.org,
 peterz@...radead.org, wangkefeng.wang@...wei.com, surenb@...gle.com,
 ziy@...dia.com, smostafa@...gle.com, ubizjak@...il.com, jbohac@...e.cz,
 broonie@...nel.org, akpm@...ux-foundation.org, guoweikang.kernel@...il.com,
 rppt@...nel.org, pcc@...gle.com, jan.kiszka@...mens.com,
 nicolas.schier@...ux.dev, will@...nel.org, andreyknvl@...il.com,
 jhubbard@...dia.com, bp@...en8.de
Cc: x86@...nel.org, linux-doc@...r.kernel.org, linux-mm@...ck.org,
 llvm@...ts.linux.dev, linux-kbuild@...r.kernel.org,
 kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 04/19] x86: Add arch specific kasan functions


On 8/25/25 10:24 PM, Maciej Wieczor-Retman wrote:

> +static inline void *__tag_set(const void *__addr, u8 tag)
> +{
> +	u64 addr = (u64)__addr;
> +
> +	addr &= ~__tag_shifted(KASAN_TAG_MASK);
> +	addr |= __tag_shifted(tag);
> +
> +	return (void *)addr;
> +}
> +


This requires some ifdef magic to avoid getting this into vdso32 image build process,
otherwise we'll get this warning:

CC      arch/x86/entry/vdso/vdso32/vclock_gettime.o
In file included from ../arch/x86/include/asm/page.h:10,
                 from ../arch/x86/include/asm/processor.h:20,
                 from ../arch/x86/include/asm/timex.h:5,
                 from ../include/linux/timex.h:67,
                 from ../include/linux/time32.h:13,
                 from ../include/linux/time.h:60,
                 from ../arch/x86/entry/vdso/vdso32/../vclock_gettime.c:11,
                 from ../arch/x86/entry/vdso/vdso32/vclock_gettime.c:4:
../arch/x86/include/asm/kasan.h: In function ‘__tag_set’:
../arch/x86/include/asm/kasan.h:81:20: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
   81 |         u64 addr = (u64)__addr;
      |                    ^
../arch/x86/include/asm/kasan.h:86:16: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
   86 |         return (void *)addr;
      |                ^