diff options
author | David Gibson <david@gibson.dropbear.id.au> | 2005-11-29 19:34:32 -0800 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-29 19:47:03 -0800 |
commit | 5bd0190bf3d7e53043a048e809ffa29d41b9d6ac (patch) | |
tree | c6fba8d5a532ecfa53dc97a3841d13d972964854 /fs/direct-io.c | |
parent | df69a60dc6afc2936d79054d30b481c1fd9720e5 (diff) |
[PATCH] Fix crash when ptrace poking hugepage areas
set_page_dirty() will not cope with being handed a page * which is part of
a compound page, but not the master page in that compound page. This case
can occur via access_process_vm() if you attemp to write to another
process's hugepage memory area using ptrace() (causing an oops or hang).
This patch fixes the bug by only calling set_page_dirty() from
access_process_vm() if the page is not a compound page. We already use a
similar fix in bio_set_pages_dirty() for the case of direct io to
hugepages.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/direct-io.c')
0 files changed, 0 insertions, 0 deletions