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acca4f4d9b
There was a race in the kmap_coherent() implementation. While we
guarded against preemption, there was nothing preventing eviction of
the pre-faulted fixmap entry from the UTLB. Under certain workloads
this would result in the fixmap entries used for cache colouring being
evicted from the UTLB in the midst of a copy_page().
In addition to pre-faulting, we also make sure to preserve the PTEs
in the kernel page table and introduce a cached PTE for kmap_coherent()
usage. This follows a similar change on MIPS ("[MIPS] Fix aliasing bug
in copy_to_user_page / copy_from_user_page").
Reported-by: Hideo Saito <saito@densan.co.jp>
Reported-by: CHIKAMA Masaki <masaki.chikama@gmail.com>
Tested-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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| .. | ||
| cache-debugfs.c | ||
| cache-sh2.c | ||
| cache-sh2a.c | ||
| cache-sh3.c | ||
| cache-sh4.c | ||
| cache-sh5.c | ||
| cache-sh7705.c | ||
| consistent.c | ||
| extable_32.c | ||
| extable_64.c | ||
| fault_32.c | ||
| fault_64.c | ||
| hugetlbpage.c | ||
| init.c | ||
| ioremap_32.c | ||
| ioremap_64.c | ||
| Kconfig | ||
| Makefile | ||
| Makefile_32 | ||
| Makefile_64 | ||
| numa.c | ||
| pg-nommu.c | ||
| pg-sh4.c | ||
| pg-sh7705.c | ||
| pmb.c | ||
| tlb-nommu.c | ||
| tlb-sh3.c | ||
| tlb-sh4.c | ||
| tlb-sh5.c | ||
| tlbflush_32.c | ||
| tlbflush_64.c | ||