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When CONFIG_DEBUG_SG is set, sg->sg_magic is initialized in sg_init_table() and it is verified in sg api while navigating. We hit BUG_ON when magic check is failed. In functions sg_tcp_sendpage and sg_tcp_sendmsg, the struct containing the scatterlist is already zeroed out. So to avoid extra memset, we use sg_init_marker() to initialize sg_magic. Fixed following things: - In bpf_tcp_sendpage: initialize sg using sg_init_marker - In bpf_tcp_sendmsg: Replace sg_init_table with sg_init_marker - In bpf_tcp_push: Replace memset with sg_init_table where consumed sg entry needs to be re-initialized. Signed-off-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp> Acked-by: John Fastabend <john.fastabend@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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.