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mm: kmsan: handle alloc failures in kmsan_ioremap_page_range()

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Similarly to kmsan_vmap_pages_range_noflush(), kmsan_ioremap_page_range()
must also properly handle allocation/mapping failures.  In the case of
such, it must clean up the already created metadata mappings and return an
error code, so that the error can be propagated to ioremap_page_range(). 
Without doing so, KMSAN may silently fail to bring the metadata for the
page range into a consistent state, which will result in user-visible
crashes when trying to access them.

Link: https://lkml.kernel.org/r/20230413131223.4135168-2-glider@google.com
Fixes: b073d7f8ae ("mm: kmsan: maintain KMSAN metadata for page operations")
Signed-off-by: Alexander Potapenko <glider@google.com>
Reported-by: Dipanjan Das <mail.dipanjan.das@gmail.com>
  Link: https://lore.kernel.org/linux-mm/CANX2M5ZRrRA64k0hOif02TjmY9kbbO2aCBPyq79es34RXZ=cAw@mail.gmail.com/
Reviewed-by: Marco Elver <elver@google.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Alexander Potapenko
2023-04-13 15:12:21 +02:00
committed by Andrew Morton
parent 47ebd0310e
commit fdea03e12a
3 changed files with 59 additions and 19 deletions
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19
include/linux/kmsan.h
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@@ -160,11 +160,12 @@ void kmsan_vunmap_range_noflush(unsigned long start, unsigned long end);
* @page_shift: page_shift argument passed to vmap_range_noflush().
*
* KMSAN creates new metadata pages for the physical pages mapped into the
* virtual memory.
* virtual memory. Returns 0 on success, callers must check for non-zero return
* value.
*/
void kmsan_ioremap_page_range(unsigned long addr, unsigned long end,
phys_addr_t phys_addr, pgprot_t prot,
unsigned int page_shift);
int kmsan_ioremap_page_range(unsigned long addr, unsigned long end,
phys_addr_t phys_addr, pgprot_t prot,
unsigned int page_shift);
/**
* kmsan_iounmap_page_range() - Notify KMSAN about a iounmap_page_range() call.
@@ -296,12 +297,12 @@ static inline void kmsan_vunmap_range_noflush(unsigned long start,
{
}
static inline void kmsan_ioremap_page_range(unsigned long start,
unsigned long end,
phys_addr_t phys_addr,
pgprot_t prot,
unsigned int page_shift)
static inline int kmsan_ioremap_page_range(unsigned long start,
unsigned long end,
phys_addr_t phys_addr, pgprot_t prot,
unsigned int page_shift)
{
return 0;
}
static inline void kmsan_iounmap_page_range(unsigned long start,