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Using strscpy was wrong because FORTIFY_SOURCE is passing the maximum possible size of the outermost object, but strscpy defines the count parameter as the exact buffer size, so this could copy past the end of the source. This would still be wrong with the planned usage of __builtin_object_size(p, 1) for intra-object overflow checks since it's the maximum possible size of the specified object with no guarantee of it being that large. Reuse of the fortified functions like this currently makes the runtime error reporting less precise but that can be improved later on. Noticed by Dave Jones and KASAN. Signed-off-by: Daniel Micay <danielmicay@gmail.com> Acked-by: Kees Cook <keescook@chromium.org> Reported-by: Dave Jones <davej@codemonkey.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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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.