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04 Apr 2025 06:15:17 -0700 From: Maciej Wieczor-Retman To: hpa@zytor.com, hch@infradead.org, nick.desaulniers+lkml@gmail.com, kuan-ying.lee@canonical.com, masahiroy@kernel.org, samuel.holland@sifive.com, mingo@redhat.com, corbet@lwn.net, ryabinin.a.a@gmail.com, guoweikang.kernel@gmail.com, jpoimboe@kernel.org, ardb@kernel.org, vincenzo.frascino@arm.com, glider@google.com, kirill.shutemov@linux.intel.com, apopple@nvidia.com, samitolvanen@google.com, maciej.wieczor-retman@intel.com, kaleshsingh@google.com, jgross@suse.com, andreyknvl@gmail.com, scott@os.amperecomputing.com, tony.luck@intel.com, dvyukov@google.com, pasha.tatashin@soleen.com, ziy@nvidia.com, broonie@kernel.org, gatlin.newhouse@gmail.com, jackmanb@google.com, wangkefeng.wang@huawei.com, thiago.bauermann@linaro.org, tglx@linutronix.de, kees@kernel.org, akpm@linux-foundation.org, jason.andryuk@amd.com, snovitoll@gmail.com, xin@zytor.com, jan.kiszka@siemens.com, bp@alien8.de, rppt@kernel.org, peterz@infradead.org, pankaj.gupta@amd.com, thuth@redhat.com, andriy.shevchenko@linux.intel.com, joel.granados@kernel.org, kbingham@kernel.org, nicolas@fjasle.eu, mark.rutland@arm.com, surenb@google.com, catalin.marinas@arm.com, morbo@google.com, justinstitt@google.com, ubizjak@gmail.com, jhubbard@nvidia.com, urezki@gmail.com, dave.hansen@linux.intel.com, bhe@redhat.com, luto@kernel.org, baohua@kernel.org, nathan@kernel.org, will@kernel.org, brgerst@gmail.com Cc: llvm@lists.linux.dev, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, x86@kernel.org Subject: [PATCH v3 03/14] x86: Add arch specific kasan functions Date: Fri, 4 Apr 2025 15:14:07 +0200 Message-ID: X-Mailer: git-send-email 2.49.0 In-Reply-To: References: MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: BB5D78000F X-Stat-Signature: 38m9cupfz7jn3ya38ro7nzakq684fs1f X-HE-Tag: 1743772532-869474 X-HE-Meta: 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 EkSygtfN t/GOUOD053VsWwUTRkuNmgRstaNIDJzyzDYcsPRf/HNTV0r+CAwYDql/FkPRM7fxIOLF3Nmx+4TuR/cXrj9alWlKHc048xr7lF+we/kJ6SPUYq9E+/7WZ6lKN+pxZ05sb5bnjnPW6GxoS25+onMbzMHeCbV4EYZyDgMzQ2A+MZyBfDyTbFjEwIUPdYjKZd000dYW4cVF/hAmZtFIOSEDzoc/y1Kq/XNUnRq6zoOuWSocKjTLN+nRcEZF+iO2tuCusuYat8077THTD9ajXxerRjeUSL4cmMCUmWHH8 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: List-Subscribe: List-Unsubscribe: KASAN's software tag-based mode needs multiple macros/functions to handle tag and pointer interactions - mainly to set and retrieve tags from the top bits of a pointer. Mimic functions currently used by arm64 but change the tag's position to bits [60:57] in the pointer. Signed-off-by: Maciej Wieczor-Retman --- Changelog v3: - Reorder functions so that __tag_*() etc are above the arch_kasan_*() ones. - Remove CONFIG_KASAN condition from __tag_set() arch/x86/include/asm/kasan.h | 32 ++++++++++++++++++++++++++++++-- 1 file changed, 30 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/kasan.h b/arch/x86/include/asm/kasan.h index d7e33c7f096b..212218622963 100644 --- a/arch/x86/include/asm/kasan.h +++ b/arch/x86/include/asm/kasan.h @@ -3,6 +3,8 @@ #define _ASM_X86_KASAN_H #include +#include +#include #define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL) #define KASAN_SHADOW_SCALE_SHIFT 3 @@ -24,8 +26,33 @@ KASAN_SHADOW_SCALE_SHIFT))) #ifndef __ASSEMBLER__ +#include +#include +#include + +#ifdef CONFIG_KASAN_SW_TAGS + +#define __tag_shifted(tag) FIELD_PREP(GENMASK_ULL(60, 57), tag) +#define __tag_reset(addr) (sign_extend64((u64)(addr), 56)) +#define __tag_get(addr) ((u8)FIELD_GET(GENMASK_ULL(60, 57), (u64)addr)) +#else +#define __tag_shifted(tag) 0UL +#define __tag_reset(addr) (addr) +#define __tag_get(addr) 0 +#endif /* CONFIG_KASAN_SW_TAGS */ + +static inline const void *__tag_set(const void *addr, u8 tag) +{ + u64 __addr = (u64)addr & ~__tag_shifted(KASAN_TAG_KERNEL); + return (const void *)(__addr | __tag_shifted(tag)); +} + +#define arch_kasan_set_tag(addr, tag) __tag_set(addr, tag) +#define arch_kasan_reset_tag(addr) __tag_reset(addr) +#define arch_kasan_get_tag(addr) __tag_get(addr) #ifdef CONFIG_KASAN + void __init kasan_early_init(void); void __init kasan_init(void); void __init kasan_populate_shadow_for_vaddr(void *va, size_t size, int nid); @@ -34,8 +61,9 @@ static inline void kasan_early_init(void) { } static inline void kasan_init(void) { } static inline void kasan_populate_shadow_for_vaddr(void *va, size_t size, int nid) { } -#endif -#endif +#endif /* CONFIG_KASAN */ + +#endif /* __ASSEMBLER__ */ #endif