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x86: kmsan: sync metadata pages on page fault 

KMSAN assumes shadow and origin pages for every allocated page are
accessible.  For pages between [VMALLOC_START, VMALLOC_END] those metadata
pages start at KMSAN_VMALLOC_SHADOW_START and KMSAN_VMALLOC_ORIGIN_START,
therefore we must sync a bigger memory region.

Link: https://lkml.kernel.org/r/20220915150417.722975-37-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 17:04:10 +02:00 committed by Andrew Morton
parent ff901d80ff
commit 3f1e2c7a90
1 changed files with 22 additions and 1 deletions
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23
arch/x86/mm/fault.c
View File

@ -260,7 +260,7 @@ static noinline int vmalloc_fault(unsigned long address)
}
NOKPROBE_SYMBOL(vmalloc_fault);
void arch_sync_kernel_mappings(unsigned long start, unsigned long end)
static void __arch_sync_kernel_mappings(unsigned long start, unsigned long end)
{
unsigned long addr;
@ -284,6 +284,27 @@ void arch_sync_kernel_mappings(unsigned long start, unsigned long end)
}
}
void arch_sync_kernel_mappings(unsigned long start, unsigned long end)
{
__arch_sync_kernel_mappings(start, end);
#ifdef CONFIG_KMSAN
/*
* KMSAN maintains two additional metadata page mappings for the
* [VMALLOC_START, VMALLOC_END) range. These mappings start at
* KMSAN_VMALLOC_SHADOW_START and KMSAN_VMALLOC_ORIGIN_START and
* have to be synced together with the vmalloc memory mapping.
*/
if (start >= VMALLOC_START && end < VMALLOC_END) {
__arch_sync_kernel_mappings(
start - VMALLOC_START + KMSAN_VMALLOC_SHADOW_START,
end - VMALLOC_START + KMSAN_VMALLOC_SHADOW_START);
__arch_sync_kernel_mappings(
start - VMALLOC_START + KMSAN_VMALLOC_ORIGIN_START,
end - VMALLOC_START + KMSAN_VMALLOC_ORIGIN_START);
}
#endif
}
static bool low_pfn(unsigned long pfn)
{
return pfn < max_low_pfn;