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Fri, 28 Nov 2025 03:33:52 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (unknown [10.72.112.7]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id A23FA19560B0; Fri, 28 Nov 2025 03:33:44 +0000 (UTC) From: Baoquan He To: linux-mm@kvack.org Cc: ryabinin.a.a@gmail.com, andreyknvl@gmail.com, glider@google.com, dvyukov@google.com, vincenzo.frascino@arm.com, akpm@linux-foundation.org, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, kexec@lists.infradead.org, elver@google.com, sj@kernel.org, lorenzo.stoakes@oracle.com, snovitoll@gmail.com, christophe.leroy@csgroup.eu, Baoquan He Subject: [PATCH v4 02/12] mm/kasan: move kasan= code to common place Date: Fri, 28 Nov 2025 11:33:10 +0800 Message-ID: <20251128033320.1349620-3-bhe@redhat.com> In-Reply-To: <20251128033320.1349620-1-bhe@redhat.com> References: <20251128033320.1349620-1-bhe@redhat.com> MIME-Version: 1.0 Content-type: text/plain Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 X-Rspam-User: X-Rspamd-Queue-Id: 706AA40003 X-Rspamd-Server: rspam11 X-Stat-Signature: 7jdworwfnsu5qsrtuhqybyfp73a96wxn X-HE-Tag: 1764300840-388436 X-HE-Meta: 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 1+wFH3q0 SGjJ6BLdlBPB4jk5ydofDNxHcJxeYJV/b36/NwNlKQoUirlLgnMHL7qLxbsnfLMPpvSUdH/OVpDJncuouhmWRAHH3VX4tvLqrMbyNNA8Ogis4w/1a7iITJgYoXfoGF+W+GRhuSHGaJsfwdkiD3yXKDR5gp9KOnb4Vp+S22i60yRZXU/UaLWJXr7i0PSmM11mHnitUhUUqzcumiuPdD5oXa+fz7x2trnsNPKbO01bFHwXZ8wru/5cBQMHdT00vYYf6SxEGrx0cw9ULrwetUtXDjORQd0ymE55kcO5WQm8NR21YHzR/xFnfAJpo7taM23JJnXLyHaIRD2jpI89i4CBG1RqNMifJN3d7MyY/1eNfY1R0IAjyeEkieyEFTICSyEH0zzlo0avslYlW0/0KOv96pyYjkw== 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: This allows generic and sw_tags to be set in kernel cmdline too. When at it, rename 'kasan_arg' to 'kasan_arg_disabled' as a bool variable. And expose 'kasan_flag_enabled' to kasan common place too. This is prepared for later adding kernel parameter kasan=on|off for all three kasan modes. Signed-off-by: Baoquan He --- include/linux/kasan-enabled.h | 4 +++- mm/kasan/common.c | 20 ++++++++++++++++++-- mm/kasan/hw_tags.c | 28 ++-------------------------- 3 files changed, 23 insertions(+), 29 deletions(-) diff --git a/include/linux/kasan-enabled.h b/include/linux/kasan-enabled.h index 9eca967d8526..b05ec6329fbe 100644 --- a/include/linux/kasan-enabled.h +++ b/include/linux/kasan-enabled.h @@ -4,13 +4,15 @@ #include -#if defined(CONFIG_ARCH_DEFER_KASAN) || defined(CONFIG_KASAN_HW_TAGS) +extern bool kasan_arg_disabled; + /* * Global runtime flag for KASAN modes that need runtime control. * Used by ARCH_DEFER_KASAN architectures and HW_TAGS mode. */ DECLARE_STATIC_KEY_FALSE(kasan_flag_enabled); +#if defined(CONFIG_ARCH_DEFER_KASAN) || defined(CONFIG_KASAN_HW_TAGS) /* * Runtime control for shadow memory initialization or HW_TAGS mode. * Uses static key for architectures that need deferred KASAN or HW_TAGS. diff --git a/mm/kasan/common.c b/mm/kasan/common.c index 1d27f1bd260b..ac14956986ee 100644 --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -32,14 +32,30 @@ #include "kasan.h" #include "../slab.h" -#if defined(CONFIG_ARCH_DEFER_KASAN) || defined(CONFIG_KASAN_HW_TAGS) /* * Definition of the unified static key declared in kasan-enabled.h. * This provides consistent runtime enable/disable across KASAN modes. */ DEFINE_STATIC_KEY_FALSE(kasan_flag_enabled); EXPORT_SYMBOL_GPL(kasan_flag_enabled); -#endif + +bool kasan_arg_disabled __ro_after_init; +/* kasan=off/on */ +static int __init early_kasan_flag(char *arg) +{ + if (!arg) + return -EINVAL; + + if (!strcmp(arg, "off")) + kasan_arg_disabled = true; + else if (!strcmp(arg, "on")) + kasan_arg_disabled = false; + else + return -EINVAL; + + return 0; +} +early_param("kasan", early_kasan_flag); struct slab *kasan_addr_to_slab(const void *addr) { diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c index 1c373cc4b3fa..709c91abc1b1 100644 --- a/mm/kasan/hw_tags.c +++ b/mm/kasan/hw_tags.c @@ -22,12 +22,6 @@ #include "kasan.h" -enum kasan_arg { - KASAN_ARG_DEFAULT, - KASAN_ARG_OFF, - KASAN_ARG_ON, -}; - enum kasan_arg_mode { KASAN_ARG_MODE_DEFAULT, KASAN_ARG_MODE_SYNC, @@ -41,7 +35,6 @@ enum kasan_arg_vmalloc { KASAN_ARG_VMALLOC_ON, }; -static enum kasan_arg kasan_arg __ro_after_init; static enum kasan_arg_mode kasan_arg_mode __ro_after_init; static enum kasan_arg_vmalloc kasan_arg_vmalloc __initdata; @@ -81,23 +74,6 @@ unsigned int kasan_page_alloc_sample_order = PAGE_ALLOC_SAMPLE_ORDER_DEFAULT; DEFINE_PER_CPU(long, kasan_page_alloc_skip); -/* kasan=off/on */ -static int __init early_kasan_flag(char *arg) -{ - if (!arg) - return -EINVAL; - - if (!strcmp(arg, "off")) - kasan_arg = KASAN_ARG_OFF; - else if (!strcmp(arg, "on")) - kasan_arg = KASAN_ARG_ON; - else - return -EINVAL; - - return 0; -} -early_param("kasan", early_kasan_flag); - /* kasan.mode=sync/async/asymm */ static int __init early_kasan_mode(char *arg) { @@ -222,7 +198,7 @@ void kasan_init_hw_tags_cpu(void) * When this function is called, kasan_flag_enabled is not yet * set by kasan_init_hw_tags(). Thus, check kasan_arg instead. */ - if (kasan_arg == KASAN_ARG_OFF) + if (kasan_arg_disabled) return; /* @@ -240,7 +216,7 @@ void __init kasan_init_hw_tags(void) return; /* If KASAN is disabled via command line, don't initialize it. */ - if (kasan_arg == KASAN_ARG_OFF) + if (kasan_arg_disabled) return; switch (kasan_arg_mode) { -- 2.41.0