nfs: disallow duplicate pages in pgio page vectors

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commit bba5c1887a upstream.

Adjacent requests that share the same page are allowed, but should only
use one entry in the page vector. This avoids overruning the page
vector - it is sized based on how many bytes there are, not by
request count.

This fixes issues that manifest as "Redzone overwritten" bugs (the
vector overrun) and hangs waiting on page read / write, as it waits on
the same page more than once.

This also adds bounds checking to the page vector with a graceful failure
(WARN_ON_ONCE and pgio error returned to application).

Reported-by: Toralf Förster <toralf.foerster@gmx.de>
Signed-off-by: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Weston Andros Adamson 2014-09-15 14:14:44 -04:00 • committed by Greg Kroah-Hartman

parent 274a1dc919

commit 42e32385b1

1 changed files with 15 additions and 3 deletions

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fs/nfs/pagelist.c

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