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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2009-09-21 17:02:34 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-22 07:17:34 -0700
commitd0107eb07320b5d37c0f8a9f015534caebb28a48 (patch)
tree9f4f1000af3919d1118356ae7c6b298c6aa81769 /arch
parentdd32c279983bf77fdcc8a9aa4a05b0ffdc75859c (diff)
kcore: fix vread/vwrite to be aware of holes
vread/vwrite access vmalloc area without checking there is a page or not. In most case, this works well. In old ages, the caller of get_vm_ara() is only IOREMAP and there is no memory hole within vm_struct's [addr...addr + size - PAGE_SIZE] ( -PAGE_SIZE is for a guard page.) After per-cpu-alloc patch, it uses get_vm_area() for reserve continuous virtual address but remap _later_. There tend to be a hole in valid vmalloc area in vm_struct lists. Then, skip the hole (not mapped page) is necessary. This patch updates vread/vwrite() for avoiding memory hole. Routines which access vmalloc area without knowing for which addr is used are - /proc/kcore - /dev/kmem kcore checks IOREMAP, /dev/kmem doesn't. After this patch, IOREMAP is checked and /dev/kmem will avoid to read/write it. Fixes to /proc/kcore will be in the next patch in series. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: WANG Cong <xiyou.wangcong@gmail.com> Cc: Mike Smith <scgtrp@gmail.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions