m68k: call find_vma with the mmap_sem held in sys_cacheflush()

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Performing vma lookups without taking the mm->mmap_sem is asking for
trouble.  While doing the search, the vma in question can be modified or
even removed before returning to the caller.  Take the lock (shared) in
order to avoid races while iterating through the vmacache and/or rbtree.
In addition, this guarantees that the address space will remain intact
during the CPU flushing.

Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

...

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Davidlohr Bueso 2014-10-09 15:29:45 -07:00 • committed by Linus Torvalds

parent 7cc36bbddd

commit cd2567b685

1 changed files with 13 additions and 8 deletions

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arch/m68k/kernel/sys_m68k.c

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