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base-files: set ptmxmode to 666

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Make sure that the (newer) /dev/pts/ptmx is accessible by users. This
is useful e.g. when running containers which symlink /dev/ptmx to
/dev/pts/ptmx on start. The default mode (000) does not allow to
create ptys inside the container.

Using 666 when symlinking /dev/ptmx is also recommended by the kernel
documentation when /dev/ptmx is symlinked:
https://www.kernel.org/doc/Documentation/filesystems/devpts.txt

Also buildroot uses ptmxmode=0666. The patch introducing the change
explains related use cases why this is necessary a bit more in depth:
8196b299ba (diff-2d4604b9e565eb19fa52ce31f282f06c)

(From OE-Core rev: c999bc5ddd9beb5274f77b885e2ac71205e42266)

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Stefan Agner 2019-11-15 16:09:44 +00:00 committed by Richard Purdie
parent cf57a45026
commit 73f6b1f68d
1 changed files with 1 additions and 1 deletions
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2
meta/recipes-core/base-files/base-files/fstab
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@ -2,7 +2,7 @@
/dev/root / auto defaults 1 1
proc /proc proc defaults 0 0
devpts /dev/pts devpts mode=0620,gid=5 0 0
devpts /dev/pts devpts mode=0620,ptmxmode=0666,gid=5 0 0
tmpfs /run tmpfs mode=0755,nodev,nosuid,strictatime 0 0
tmpfs /var/volatile tmpfs defaults 0 0