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The SECCOMP_RET_KILL mode is documented as immediately killing the process as if a SIGSYS had been sent and not caught (similar to a SIGKILL). However, a SIGSYS is documented as triggering a coredump which does not happen today. This has the advantage of being able to more easily debug a process that fails a seccomp filter. Today, most apps need to recompile and change their filter in order to get detailed info out, or manually run things through strace, or enable detailed kernel auditing. Now we get coredumps that fit into existing system-wide crash reporting setups. From a security pov, this shouldn't be a problem. Unhandled signals can already be sent externally which trigger a coredump independent of the status of the seccomp filter. The act of dumping core itself does not cause change in execution of the program. URL: https://crbug.com/676357 Signed-off-by: Mike Frysinger <vapier@chromium.org> Acked-by: Jorge Lucangeli Obes <jorgelo@chromium.org> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: James Morris <james.l.morris@oracle.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.