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__htab_map_lookup_and_delete_batch() stores a user pointer in the local variable ubatch and uses that in copy_{from,to}_user(), but ubatch misses a __user annotation. So, sparse warns in the various assignments and uses of ubatch: kernel/bpf/hashtab.c:1415:24: warning: incorrect type in initializer (different address spaces) kernel/bpf/hashtab.c:1415:24: expected void *ubatch kernel/bpf/hashtab.c:1415:24: got void [noderef] __user * kernel/bpf/hashtab.c:1444:46: warning: incorrect type in argument 2 (different address spaces) kernel/bpf/hashtab.c:1444:46: expected void const [noderef] __user *from kernel/bpf/hashtab.c:1444:46: got void *ubatch kernel/bpf/hashtab.c:1608:16: warning: incorrect type in assignment (different address spaces) kernel/bpf/hashtab.c:1608:16: expected void *ubatch kernel/bpf/hashtab.c:1608:16: got void [noderef] __user * kernel/bpf/hashtab.c:1609:26: warning: incorrect type in argument 1 (different address spaces) kernel/bpf/hashtab.c:1609:26: expected void [noderef] __user *to kernel/bpf/hashtab.c:1609:26: got void *ubatch Add the __user annotation to repair this chain of propagating __user annotations in __htab_map_lookup_and_delete_batch(). Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20201207123720.19111-1-lukas.bulwahn@gmail.com
Linux kernel ============ There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. The formatted documentation can also be read online at: https://www.kernel.org/doc/html/latest/ There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. 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.
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