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loop: zero fill bio instead of return -EIO for partial read 

commit 8268f5a741 ("deny partial write for loop dev fd") tried to fix the
loop device partial read information leak problem.  But it changed the
semantics of read behavior.  When we read beyond the end of the device we
should get 0 bytes, which is normal behavior, we should not just return
-EIO

Instead of returning -EIO, zero out the bio to avoid information leak in
case of partail read.

Signed-off-by: Dave Young <dyoung@redhat.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Tested-by: Jeff Moyer <jmoyer@redhat.com>
Cc: Dmitry Monakhov <dmonakhov@sw.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Dave Young 2012-02-08 22:07:19 +01:00 committed by Jens Axboe
parent 5abebfdd02
commit 306df0716a
1 changed files with 13 additions and 11 deletions
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24
drivers/block/loop.c
View File

@ -356,14 +356,14 @@ lo_direct_splice_actor(struct pipe_inode_info *pipe, struct splice_desc *sd)
return __splice_from_pipe(pipe, sd, lo_splice_actor);
}
static int
static ssize_t
do_lo_receive(struct loop_device *lo,
struct bio_vec *bvec, int bsize, loff_t pos)
{
struct lo_read_data cookie;
struct splice_desc sd;
struct file *file;
long retval;
ssize_t retval;
cookie.lo = lo;
cookie.page = bvec->bv_page;
@ -379,26 +379,28 @@ do_lo_receive(struct loop_device *lo,
file = lo->lo_backing_file;
retval = splice_direct_to_actor(file, &sd, lo_direct_splice_actor);
if (retval < 0)
return retval;
if (retval != bvec->bv_len)
return -EIO;
return 0;
return retval;
}
static int
lo_receive(struct loop_device *lo, struct bio *bio, int bsize, loff_t pos)
{
struct bio_vec *bvec;
int i, ret = 0;
ssize_t s;
int i;
bio_for_each_segment(bvec, bio, i) {
ret = do_lo_receive(lo, bvec, bsize, pos);
if (ret < 0)
s = do_lo_receive(lo, bvec, bsize, pos);
if (s < 0)
return s;
if (s != bvec->bv_len) {
zero_fill_bio(bio);
break;
}
pos += bvec->bv_len;
}
return ret;
return 0;
}
static int do_bio_filebacked(struct loop_device *lo, struct bio *bio)