Re: [PATCH] block/copy-before-write: use uint64_t for timeout in nanoseconds

[Kevin Wolf]

Am 29.04.2024 um 16:19 hat Fiona Ebner geschrieben:
> rather than the uint32_t for which the maximum is slightly more than 4
> seconds and larger values would overflow. The QAPI interface allows
> specifying the number of seconds, so only values 0 to 4 are safe right
> now, other values lead to a much lower timeout than a user expects.
> 
> The block_copy() call where this is used already takes a uint64_t for
> the timeout, so no change required there.
> 
> Fixes: 6db7fd1ca9 ("block/copy-before-write: implement cbw-timeout option")
> Reported-by: Friedrich Weber <f.weber@proxmox.com>
> Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>

Thanks, applied to the block branch.

But I don't think our job is done yet with this. Increasing the limit is
good and useful, but even if it's now unlikely to hit with sane values,
we should still catch integer overflows in cbw_open() and return an
error on too big values instead of silently wrapping around.

Kevin