lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Mon, 12 May 2008 07:48:56 +0100
From:	Gerrit Renker <gerrit@....abdn.ac.uk>
To:	Tomasz Grobelny <tomasz@...belny.oswiecenia.net>
Cc:	dccp@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/1] [QPOLICY]: cmsg header parsing fixes

| > I don't know what your extension plans are, my suggestion is to wrap up
| > the patches in the qpolicy subtree, cast them as one patch within the
| > test tree and continue any additions/further work based on that.
| >
| Agreed, the only thing that may need correction now is this line:
| 	skb->priority = *(__u32 *)CMSG_DATA(cmsg);
| But I really don't know how it should look like, and I have neither knowledge 
| nor machines to test on other architectures. 
After a further look, I think your code is in fact correct. The data portion
is always either 32-bit or 64-bit aligned:

#define CMSG_ALIGN(len) ( ((len)+sizeof(long)-1) & ~(sizeof(long)-1) )
#define CMSG_DATA(cmsg) ((void *)((char *)(cmsg) + CMSG_ALIGN(sizeof(struct cmsghdr))))


Further, casting into various types is done quite freely throughout the code:

577  net/ipv6/datagram.c <<datagram_send_ctl>>
        fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
704  net/ipv6/datagram.c <<datagram_send_ctl>>
        *hlimit = *(int *)CMSG_DATA(cmsg);
59  net/rxrpc/ar-output.c <<rxrpc_sendmsg_cmsg>>
        *user_call_ID = *(u32 *) CMSG_DATA(cmsg);
75  net/rxrpc/ar-output.c <<rxrpc_sendmsg_cmsg>>
        *abort_code = *(unsigned int *) CMSG_DATA(cmsg);


| Other than that we could consider the patch ready.
| 
I will post it subsequently. If you are ok with it, add your signed-off
line and I will put it into the tree; if anything is unclear or needs
further consideration, let me know.


| As for my extension plans, I can see a few things that could be improved:
|  - adding timeout parameter,
|  - providing information about available qpolicies and parameters to 
| userspace,
|  - providing statistical information about qpolicy to userspace applications.
| (That doesn't necessarily mean I wish to write patches for all these 
| features.)
| -- 
Once the patch is in the test tree, we can keep the qpolicy subtree for
further development/testing. Regarding statistics, there is a MIB in the
code already (dccp_statistics), but when compiled as a module the
statistics do not show up under /proc/net/snmp or /proc/net/snmp6 -
maybe it works when compiling all of DCCP into the kernel.

Gerrit


The University of Aberdeen is a charity registered in Scotland, No SC013683.

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists