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Commit98a6f1fc02(fs/cpio: make initramfs init script survive 'console=' kernel argument) dropped the explicit /dev/console execs for fd 0,1,2, as they fail when booted with console= and aren't really needed as the kernel will setup fd 0,1,2 from /dev/console before executing the initramfs anyway. Not doing this unfortunately confuses glibc's ttyname_r(3) implementation (used by E.G. busybox/coreutils 'tty'), causing it to fail with ENOENT as it does a fstat on fd 0 and tries to match up st_ino / st_dev against the entries in /dev (since glibc 2.26): commit 15e9a4f378c8607c2ae1aa465436af4321db0e23 Author: Christian Brauner <christian.brauner@canonical.com> Date: Fri Jan 27 15:59:59 2017 +0100 linux ttyname and ttyname_r: do not return wrong results If a link (say /proc/self/fd/0) pointing to a device, say /dev/pts/2, in a parent mount namespace is passed to ttyname, and a /dev/pts/2 exists (in a different devpts) in the current namespace, then it returns /dev/pts/2. But /dev/pts/2 is NOT the current tty, it is a different file and device. Detect this case and return ENODEV. Userspace can choose to take this as a hint that the fd points to a tty device but to act on the fd rather than the link. Signed-off-by: Serge Hallyn <serge@hallyn.com> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com> The reason it fails is that we manually mount devtmpfs on /dev in /init, so the /dev/console used by the kernel (in rootfs) is not the same file as /dev/console at runtime (in devtmpfs). Notice: Once logged in, tty does work correctly. Presumably login reopens stdin/stdout/stderr. To fix this, re-add the exec of /dev/console for fd 0,1,2, but only do so if possible. Because of the above mentioned shell behaviour (specified by POSIX [0]), perform this check in a subshell. [0] https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_20_01 Signed-off-by: Peter Korsgaard <peter@korsgaard.com> Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr> (cherry picked from commitb9026e83f9) Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on Freenode IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches