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9d44c97384
Permission denied error comes when 2 IPv6 servers are running and client tries to connect one of them. Scenario is that both servers are using same IP and port but different protocols(Udp and tcp). They are using different SMACK64IPIN labels.Tcp server is using "test" and udp server is using "test-in". When we try to run tcp client with SMACK64IPOUT label as "test", then connection denied error comes. It should not happen since both tcp server and client labels are same.This happens because there is no check for protocol in smk_ipv6_port_label() function while searching for the earlier port entry. It checks whether there is an existing port entry on the basis of port only. So it updates the earlier port entry in the list. Due to which smack label gets changed for earlier entry in the "smk_ipv6_port_list" list and permission denied error comes. Now a check is added for socket type also.Now if 2 processes use same port but different protocols (tcp or udp), then 2 different port entries will be added in the list. Similarly while checking smack access in smk_ipv6_port_check() function, port entry is searched on the basis of both port and protocol. Signed-off-by: Vishal Goel <vishal.goel@samsung.com> Signed-off-by: Himanshu Shukla <Himanshu.sh@samsung.com> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.