From db2388b6ee40a949084e4cdddc3b0a4357068a62 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Sat, 20 Oct 2012 22:17:27 -0500 Subject: [PATCH] rbd: verify rbd image order value This adds a verification that an rbd image's object order is within the upper and lower bounds supported by this implementation. It must be at least 9 (SECTOR_SHIFT), because the Linux bio system assumes that minimum granularity. It also must be less than 32 (at the moment anyway) because there exist spots in the code that store the size of a "segment" (object backing an rbd image) in a signed int variable, which can be 32 bits including the sign. We should be able to relax this limit once we've verified the code uses 64-bit types where needed. Note that the CLI tool already limits the order to the range 12-25. Signed-off-by: Alex Elder Reviewed-by: Josh Durgin --- drivers/block/rbd.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index d032883..4734446 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -533,6 +533,16 @@ static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) return false; + /* The bio layer requires at least sector-sized I/O */ + + if (ondisk->options.order < SECTOR_SHIFT) + return false; + + /* If we use u64 in a few spots we may be able to loosen this */ + + if (ondisk->options.order > 8 * sizeof (int) - 1) + return false; + /* * The size of a snapshot header has to fit in a size_t, and * that limits the number of snapshots. -- 2.7.4