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2023-07-27autofs: use flexible array in ioctl structureArnd Bergmann1-1/+1
commit e910c8e3aa02dc456e2f4c32cb479523c326b534 upstream. Commit df8fc4e934c1 ("kbuild: Enable -fstrict-flex-arrays=3") introduced a warning for the autofs_dev_ioctl structure: In function 'check_name', inlined from 'validate_dev_ioctl' at fs/autofs/dev-ioctl.c:131:9, inlined from '_autofs_dev_ioctl' at fs/autofs/dev-ioctl.c:624:8: fs/autofs/dev-ioctl.c:33:14: error: 'strchr' reading 1 or more bytes from a region of size 0 [-Werror=stringop-overread] 33 | if (!strchr(name, '/')) | ^~~~~~~~~~~~~~~~~ In file included from include/linux/auto_dev-ioctl.h:10, from fs/autofs/autofs_i.h:10, from fs/autofs/dev-ioctl.c:14: include/uapi/linux/auto_dev-ioctl.h: In function '_autofs_dev_ioctl': include/uapi/linux/auto_dev-ioctl.h:112:14: note: source object 'path' of size 0 112 | char path[0]; | ^~~~ This is easily fixed by changing the gnu 0-length array into a c99 flexible array. Since this is a uapi structure, we have to be careful about possible regressions but this one should be fine as they are equivalent here. While it would break building with ancient gcc versions that predate c99, it helps building with --std=c99 and -Wpedantic builds in user space, as well as non-gnu compilers. This means we probably also want it fixed in stable kernels. Cc: stable@vger.kernel.org Cc: Kees Cook <keescook@chromium.org> Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20230523081944.581710-1-arnd@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-18docs: filesystems: Add mount map description in ContentJaskaran Singh1-3/+4
The second paragraph of the content section does not properly describe how mount points are determined by autofs. Replace the lines detailing how the determination of these mount points is "ad hoc" by a short description of the mount map syntax used by autofs. Signed-off-by: Jaskaran Singh <jaskaransingh7654321@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2019-11-18docs: filesystems: Update code snippets in autofs.rstJaskaran Singh1-4/+9
Some of the struct definitions now have an autofs packet header. Reflect these changes by adding a definition of this header and place it wherever suitable. Signed-off-by: Jaskaran Singh <jaskaransingh7654321@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2019-11-18docs: filesystems: convert autofs.txt to reSTJaskaran Singh1-0/+574
Convert autofs.txt to reST. The following changes abound: - Introduce reST formatting for headings, lists et al. - Add an indentation of an 8 space tab wherever suitable, so as to maintain consistency. - Remove indentation of the description of the ioctls which are similar to the AUTOFS_IOC ioctls, as it does not come out quite right in HTML. - Add an entry for autofs in the index. Signed-off-by: Jaskaran Singh <jaskaransingh7654321@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>