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author | Nick Piggin <npiggin@suse.de> | 2008-08-21 01:09:20 +0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-08-21 02:40:32 +0400 |
commit | 538f8ea6c85232d00bfa5edd9ba85f16c01057c9 (patch) | |
tree | c1a4a49c0c7f16b4fe8ec560137084bf556efc50 /net/wireless | |
parent | 479db0bf408e65baa14d2a9821abfcbc0804b847 (diff) | |
download | linux-538f8ea6c85232d00bfa5edd9ba85f16c01057c9.tar.xz |
mm: xip fix fault vs sparse page invalidate race
XIP has a race between sparse pages being inserted into page tables, and
sparse pages being zapped when its time to put a non-sparse page in.
What can happen is that a process can be left with a dangling sparse page
in a MAP_SHARED mapping, while the rest of the world sees the non-sparse
version. Ie. data corruption.
Guard these operations with a seqlock, making fault-in-sparse-pages the
slowpath, and try-to-unmap-sparse-pages the fastpath.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Jared Hulbert <jaredeh@gmail.com>
Acked-by: Carsten Otte <cotte@freenet.de>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'net/wireless')
0 files changed, 0 insertions, 0 deletions