Commit 3bb90682 authored by Dmitry Monakhov's avatar Dmitry Monakhov Committed by Jens Axboe

loop: prevent information leak after failed read

If read was not fully successful we have to fail whole bio to prevent
information leak of old pages

##Testcase_begin
dd if=/dev/zero of=./file bs=1M count=1
losetup /dev/loop0 ./file -o 4096
truncate -s 0 ./file
# OOps loop offset is now beyond i_size, so read will silently fail.
# So bio's pages would not be cleared, may which result in information leak.
hexdump -C /dev/loop0
##testcase_end
Signed-off-by: default avatarDmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 6b76106d
...@@ -372,7 +372,8 @@ do_lo_receive(struct loop_device *lo, ...@@ -372,7 +372,8 @@ do_lo_receive(struct loop_device *lo,
if (retval < 0) if (retval < 0)
return retval; return retval;
if (retval != bvec->bv_len)
return -EIO;
return 0; return 0;
} }
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment