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instrumented.h: add KMSAN support

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To avoid false positives, KMSAN needs to unpoison the data copied from the
userspace.  To detect infoleaks - check the memory buffer passed to
copy_to_user().

Link: https://lkml.kernel.org/r/20220915150417.722975-19-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Reviewed-by: Marco Elver <elver@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: 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 17:03:52 +02:00 • committed by Andrew Morton
parent 3c20650982
commit 75cf029027
3 changed files with 70 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

19
include/linux/kmsan-checks.h
View file

@ -46,6 +46,21 @@ void kmsan_unpoison_memory(const void *address, size_t size);
*/
void kmsan_check_memory(const void *address, size_t size);
/**
* kmsan_copy_to_user() - Notify KMSAN about a data transfer to userspace.
* @to: destination address in the userspace.
* @from: source address in the kernel.
* @to_copy: number of bytes to copy.
* @left: number of bytes not copied.
*
* If this is a real userspace data transfer, KMSAN checks the bytes that were
* actually copied to ensure there was no information leak. If @to belongs to
* the kernel space (which is possible for compat syscalls), KMSAN just copies
* the metadata.
*/
void kmsan_copy_to_user(void __user *to, const void *from, size_t to_copy,
size_t left);
#else
static inline void kmsan_poison_memory(const void *address, size_t size,
@ -58,6 +73,10 @@ static inline void kmsan_unpoison_memory(const void *address, size_t size)
static inline void kmsan_check_memory(const void *address, size_t size)
{
}
static inline void kmsan_copy_to_user(void __user *to, const void *from,
size_t to_copy, size_t left)
{
}
#endif