vfs: read file_handle only once in handle_to_path

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commit 161f873b89 upstream.

We used to read file_handle twice.  Once to get the amount of extra
bytes, and once to fetch the entire structure.

This may be problematic since we do size verifications only after the
first read, so if the number of extra bytes changes in userspace between
the first and second calls, we'll have an incoherent view of
file_handle.

Instead, read the constant size once, and copy that over to the final
structure without having to re-read it again.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Sasha Levin 2015-01-28 15:30:43 -05:00 • committed by Greg Kroah-Hartman

parent 9ead29e3d2

commit be647ca464

1 changed files with 3 additions and 2 deletions

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fs/fhandle.c

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