From: glider@google.com
To: Alexander Potapenko <glider@google.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>,
Andrew Morton <akpm@linux-foundation.org>,
Dmitry Vyukov <dvyukov@google.com>,
linux-mm@kvack.org
Subject: [PATCH RFC v1 10/26] kmsan: reduce vmalloc space
Date: Fri, 18 Oct 2019 11:42:48 +0200 [thread overview]
Message-ID: <20191018094304.37056-11-glider@google.com> (raw)
In-Reply-To: <20191018094304.37056-1-glider@google.com>
KMSAN is going to use 3/4 of existing vmalloc space to hold the
metadata, therefore we lower VMALLOC_END to make sure vmalloc() doesn't
allocate past the first 1/4.
Signed-off-by: Alexander Potapenko <glider@google.com>
To: Alexander Potapenko <glider@google.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: linux-mm@kvack.org
---
Change-Id: Iaa5e8e0fc2aa66c956f937f5a1de6e5ef40d57cc
---
arch/x86/include/asm/pgtable_64_types.h | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm/pgtable_64_types.h
index 52e5f5f2240d..586629e20436 100644
--- a/arch/x86/include/asm/pgtable_64_types.h
+++ b/arch/x86/include/asm/pgtable_64_types.h
@@ -139,7 +139,22 @@ extern unsigned int ptrs_per_p4d;
# define VMEMMAP_START __VMEMMAP_BASE_L4
#endif /* CONFIG_DYNAMIC_MEMORY_LAYOUT */
+#ifndef CONFIG_KMSAN
#define VMALLOC_END (VMALLOC_START + (VMALLOC_SIZE_TB << 40) - 1)
+#else
+/*
+ * In KMSAN builds vmalloc area is four times smaller, and the remaining 3/4
+ * are used to keep the metadata for virtual pages.
+ */
+#define VMALLOC_QUARTER_SIZE ((VMALLOC_SIZE_TB << 40) >> 2)
+#define VMALLOC_END (VMALLOC_START + VMALLOC_QUARTER_SIZE - 1)
+#define VMALLOC_SHADOW_OFFSET VMALLOC_QUARTER_SIZE
+#define VMALLOC_ORIGIN_OFFSET (VMALLOC_QUARTER_SIZE * 2)
+#define VMALLOC_META_END (VMALLOC_END + VMALLOC_ORIGIN_OFFSET)
+#define MODULES_SHADOW_START (VMALLOC_META_END + 1)
+#define MODULES_ORIGIN_START (MODULES_SHADOW_START + MODULES_LEN)
+#define MODULES_ORIGIN_END (MODULES_ORIGIN_START + MODULES_LEN)
+#endif
#define MODULES_VADDR (__START_KERNEL_map + KERNEL_IMAGE_SIZE)
/* The module sections ends with the start of the fixmap */
--
2.23.0.866.gb869b98d4c-goog
next prev parent reply other threads:[~2019-10-18 9:43 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-18 9:42 [PATCH RFC v1 00/26] Add KernelMemorySanitizer infrastructure glider
2019-10-18 9:42 ` [PATCH RFC v1 01/26] stackdepot: check depot_index before accessing the stack slab glider
2019-10-18 9:42 ` [PATCH RFC v1 02/26] stackdepot: prevent Clang from optimizing away stackdepot_memcmp() glider
2019-10-18 9:42 ` [PATCH RFC v1 03/26] kasan: stackdepot: move filter_irq_stacks() to stackdepot.c glider
2019-10-18 9:42 ` [PATCH RFC v1 04/26] stackdepot: reserve 5 extra bits in depot_stack_handle_t glider
2019-10-18 9:42 ` [PATCH RFC v1 05/26] printk_safe: externalize printk_context glider
2019-10-21 9:09 ` Petr Mladek
2019-10-23 17:57 ` Alexander Potapenko
2019-10-23 18:00 ` Alexander Potapenko
2019-10-24 12:46 ` Petr Mladek
2019-10-28 13:09 ` Alexander Potapenko
2019-10-29 12:02 ` Petr Mladek
2019-10-29 12:45 ` Alexander Potapenko
2019-10-18 9:42 ` [PATCH RFC v1 06/26] kasan: compiler.h: rename __no_kasan_or_inline into __no_memory_tool_or_inline glider
2019-10-18 9:42 ` [PATCH RFC v1 07/26] kmsan: add ReST documentation glider
2019-10-18 9:42 ` [PATCH RFC v1 08/26] kmsan: gfp: introduce __GFP_NO_KMSAN_SHADOW glider
2019-10-18 9:42 ` [PATCH RFC v1 09/26] kmsan: introduce __no_sanitize_memory and __SANITIZE_MEMORY__ glider
2019-10-18 9:42 ` glider [this message]
2019-10-18 9:42 ` [PATCH RFC v1 11/26] kmsan: add KMSAN runtime glider
2019-10-18 9:42 ` [PATCH RFC v1 12/26] kmsan: x86: sync metadata pages on page fault glider
2019-10-18 9:42 ` [PATCH RFC v1 13/26] kmsan: add tests for KMSAN glider
2019-10-18 9:42 ` [PATCH RFC v1 14/26] kmsan: make READ_ONCE_TASK_STACK() return initialized values glider
2019-10-18 9:42 ` [PATCH RFC v1 15/26] kmsan: Kconfig changes to disable options incompatible with KMSAN glider
2019-10-21 14:11 ` Harry Wentland
2019-10-18 9:42 ` [PATCH RFC v1 16/26] kmsan: Changing existing files to enable KMSAN builds glider
2019-10-18 9:42 ` [PATCH RFC v1 17/26] kmsan: disable KMSAN instrumentation for certain kernel parts glider
2019-10-18 9:42 ` [PATCH RFC v1 18/26] kmsan: mm: call KMSAN hooks from SLUB code glider
2019-10-18 13:22 ` Qian Cai
2019-10-18 13:33 ` Alexander Potapenko
2019-10-18 13:41 ` Qian Cai
2019-10-18 13:55 ` Alexander Potapenko
2019-10-18 14:42 ` Qian Cai
2019-10-18 14:54 ` Alexander Potapenko
2019-10-18 15:13 ` Qian Cai
2019-10-18 15:30 ` Alexander Potapenko
2019-10-18 16:08 ` Qian Cai
2019-10-18 9:42 ` [PATCH RFC v1 19/26] kmsan: call KMSAN hooks where needed glider
2019-10-18 15:02 ` Qian Cai
2019-10-29 14:09 ` Alexander Potapenko
2019-10-29 14:56 ` Qian Cai
2019-10-21 9:25 ` Petr Mladek
2019-10-29 13:59 ` Alexander Potapenko
2019-10-18 9:42 ` [PATCH RFC v1 20/26] kmsan: disable instrumentation of certain functions glider
2019-10-18 9:42 ` [PATCH RFC v1 21/26] kmsan: unpoison |tlb| in arch_tlb_gather_mmu() glider
2019-10-18 9:43 ` [PATCH RFC v1 22/26] kmsan: use __msan_memcpy() where possible glider
2019-10-18 9:43 ` [PATCH RFC v1 23/26] kmsan: unpoisoning buffers from devices etc glider
2019-10-18 15:27 ` Christoph Hellwig
2019-10-18 16:22 ` Matthew Wilcox
2019-10-29 14:45 ` Alexander Potapenko
2019-10-30 12:43 ` Alexander Potapenko
2019-10-18 9:43 ` [PATCH RFC v1 24/26] kmsan: hooks for copy_to_user() and friends glider
2019-10-18 9:43 ` [PATCH RFC v1 25/26] kmsan: disable strscpy() optimization under KMSAN glider
2019-10-18 9:43 ` [PATCH RFC v1 26/26] net: kasan: kmsan: support CONFIG_GENERIC_CSUM on x86, enable it for KASAN/KMSAN glider
2019-10-19 3:20 ` Randy Dunlap
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