Description

In the Linux kernel, the following vulnerability has been resolved: parisc: Fix non-access data TLB cache flush faults When a page is not present, we get non-access data TLB faults from the fdc and fic instructions in flush_user_dcache_range_asm and flush_user_icache_range_asm. When these occur, the cache line is not invalidated and potentially we get memory corruption. The problem was hidden by the nullification of the flush instructions. These faults also affect performance. With pa8800/pa8900 processors, there will be 32 faults per 4 KB page since the cache line is 128 bytes. There will be more faults with earlier processors. The problem is fixed by using flush_cache_pages(). It does the flush using a tmp alias mapping. The flush_cache_pages() call in flush_cache_range() flushed too large a range. V2: Remove unnecessary preempt_disable() and preempt_enable() calls.

Affected Products 2

References 3

• git.kernel.org https://git.kernel.org/stable/c/b3d6adb3a49d82e4e557c5fc16f50c9ff731da5d
  Patch
• git.kernel.org https://git.kernel.org/stable/c/ddca4b82027e2a66333dd40fab21a4beff435c7e
  Patch
• git.kernel.org https://git.kernel.org/stable/c/f839e5f1cef36ce268950c387129b1bfefdaebc9
  Patch

Remediation

• git.kernel.org https://git.kernel.org/stable/c/b3d6adb3a49d82e4e557c5fc16f50c9ff731da5d
  Patch
• git.kernel.org https://git.kernel.org/stable/c/ddca4b82027e2a66333dd40fab21a4beff435c7e
  Patch
• git.kernel.org https://git.kernel.org/stable/c/f839e5f1cef36ce268950c387129b1bfefdaebc9
  Patch