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init: kmsan: call KMSAN initialization routines

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kmsan_init_shadow() scans the mappings created at boot time and creates
metadata pages for those mappings.

When the memblock allocator returns pages to pagealloc, we reserve 2/3 of
those pages and use them as metadata for the remaining 1/3.  Once KMSAN
starts, every page allocated by pagealloc has its associated shadow and
origin pages.

kmsan_initialize() initializes the bookkeeping for init_task and enables
KMSAN.

Link: https://lkml.kernel.org/r/20220915150417.722975-18-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Eric Biggers <ebiggers@kernel.org>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Marco Elver <elver@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Alexander Potapenko
2022-09-15 17:03:51 +02:00
committed by Andrew Morton
parent 50b5e49ca6
commit 3c20650982
7 changed files with 317 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
include/linux/kmsan.h
View File

@@ -31,6 +31,28 @@ void kmsan_task_create(struct task_struct *task);
*/
void kmsan_task_exit(struct task_struct *task);
/**
* kmsan_init_shadow() - Initialize KMSAN shadow at boot time.
*
* Allocate and initialize KMSAN metadata for early allocations.
*/
void __init kmsan_init_shadow(void);
/**
* kmsan_init_runtime() - Initialize KMSAN state and enable KMSAN.
*/
void __init kmsan_init_runtime(void);
/**
* kmsan_memblock_free_pages() - handle freeing of memblock pages.
* @page: struct page to free.
* @order: order of @page.
*
* Freed pages are either returned to buddy allocator or held back to be used
* as metadata pages.
*/
bool __init kmsan_memblock_free_pages(struct page *page, unsigned int order);
/**
* kmsan_alloc_page() - Notify KMSAN about an alloc_pages() call.
* @page: struct page pointer returned by alloc_pages().
@@ -152,6 +174,20 @@ void kmsan_iounmap_page_range(unsigned long start, unsigned long end);
#else
static inline void kmsan_init_shadow(void)
{
}
static inline void kmsan_init_runtime(void)
{
}
static inline bool kmsan_memblock_free_pages(struct page *page,
unsigned int order)
{
return true;
}
static inline void kmsan_task_create(struct task_struct *task)
{
}