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Linux kernel source tree
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The examination of "current" to decide dumpability is wrong. This was a check of and euid/uid (or egid/gid) mismatch in the existing process, not the newly created one. This appears to stretch back into even the "history.git" tree. Luckily, dumpability is later set in commit_creds(). In earlier kernel versions before creds existed, similar checks also existed late in the exec flow, covering up the mistake as far back as I could find. Note that because the commit_creds() check examines differences of euid, uid, egid, gid, and capabilities between the old and new creds, it would look like the setup_new_exec() dumpability test could be entirely removed. However, the secureexec test may cover a different set of tests (specific to the LSMs) than what commit_creds() checks for. So, fix this test to use secureexec (the removed euid tests are redundant to the commoncap secureexec checks now). Cc: David Howells <dhowells@redhat.com> Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Serge Hallyn <serge@hallyn.com> Reviewed-by: James Morris <james.l.morris@oracle.com> |
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| README | ||
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.