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Re: [Qemu-devel] [PATCH RFC v2 3/9] rbd: Don't limit length of parameter
From: |
Eric Blake |
Subject: |
Re: [Qemu-devel] [PATCH RFC v2 3/9] rbd: Don't limit length of parameter values |
Date: |
Fri, 24 Mar 2017 13:34:11 -0500 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 |
On 03/24/2017 12:44 PM, Markus Armbruster wrote:
> We laboriously enforce parameter values are between one and some
> arbitrary limit in length. Only RBD_MAX_IMAGE_NAME_SIZE comes from
> librbd.h, and I'm not sure it applies. Where the other limits come
> from is unclear.
>
> Drop the length checking. The limits librbd actually imposes must be
> checked by librbd anyway.
And if librbd is NOT doing proper length checks, the bug lies there, not
in qemu.
>
> There's one minor complication: BDRVRBDState member name is a
> fixed-size array. Depends on the length limit. Make it a pointer to
> a dynamically allocated string.
>
> Signed-off-by: Markus Armbruster <address@hidden>
> ---
> block/rbd.c | 91
> ++++++++++---------------------------------------------------
> 1 file changed, 14 insertions(+), 77 deletions(-)
Wow - you weren't kidding about the checks being laborious.
> -static char *qemu_rbd_next_tok(int max_len,
> - char *src, char delim,
> - const char *name,
> - char **p, Error **errp)
> +static char *qemu_rbd_next_tok(char *src, char delim, char **p)
Getting rid of the forced length means we can't fail - nice.
> @@ -184,27 +161,15 @@ static void qemu_rbd_parse_filename(const char
> *filename, QDict *options,
> qdict_put(options, "pool", qstring_from_str(found_str));
>
> if (strchr(p, '@')) {
> - found_str = qemu_rbd_next_tok(RBD_MAX_IMAGE_NAME_SIZE, p,
> - '@', "object name", &p, &local_err);
> - if (local_err) {
> - goto done;
> - }
> + found_str = qemu_rbd_next_tok(p, '@', &p);
> qemu_rbd_unescape(found_str);
> qdict_put(options, "image", qstring_from_str(found_str));
Unrelated to your patch, and doesn't hold you up, but I'd love to
eventually get in my patch that shortens this pattern to:
qdict_put_str(options, "image", found_str);
(I still need to find time to write up a Coccinelle script to automate
the task; it's 2.10 material now)
Reviewed-by: Eric Blake <address@hidden>
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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- [Qemu-devel] [PATCH RFC v2 2/9] rbd: Fix to cleanly reject -drive without pool or image, (continued)
- [Qemu-devel] [PATCH RFC v2 2/9] rbd: Fix to cleanly reject -drive without pool or image, Markus Armbruster, 2017/03/24
- [Qemu-devel] [PATCH RFC v2 4/9] rbd: Clean up after the previous commit, Markus Armbruster, 2017/03/24
- [Qemu-devel] [PATCH RFC v2 9/9] rbd: Reject invalid authentication methods, Markus Armbruster, 2017/03/24
- [Qemu-devel] [PATCH RFC v2 7/9] rbd: Clean up qemu_rbd_create()'s detour through QemuOpts, Markus Armbruster, 2017/03/24
- [Qemu-devel] [PATCH RFC v2 8/9] rbd: Rewrite the code to extract list-valued options, Markus Armbruster, 2017/03/24
- [Qemu-devel] [PATCH RFC v2 3/9] rbd: Don't limit length of parameter values, Markus Armbruster, 2017/03/24
- Re: [Qemu-devel] [PATCH RFC v2 3/9] rbd: Don't limit length of parameter values,
Eric Blake <=
- [Qemu-devel] [PATCH RFC v2 5/9] rbd: Don't accept -drive driver=rbd, keyvalue-pairs=..., Markus Armbruster, 2017/03/24
- [Qemu-devel] [PATCH RFC v2 6/9] rbd: Clean up runtime_opts, fix -drive to reject filename, Markus Armbruster, 2017/03/24