Fix pagemap_read() use of struct mm_walk
Fix some issues in pagemap_read noted by Alexey:
- initialize pagemap_walk.mm to "mm" , so the code starts working as
advertised
- initialize ->private to "&pm" so it wouldn't immediately oops in
pagemap_pte_hole()
- unstatic struct pagemap_walk, so two threads won't fsckup each other
(including those started by root, including flipping ->mm when you don't
have permissions)
- pagemap_read() contains two calls to ptrace_may_attach(), second one
looks unneeded.
- avoid possible kmalloc(0) and integer wraparound.
Cc: Alexey Dobriyan <[email protected]>
Cc: Matt Mackall <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
[ Personally, I'd just remove the functionality entirely - Linus ]
Signed-off-by: Linus Torvalds <[email protected]>
1 file changed
