devpts: Change the owner of /dev/pts/ptmx to the mounter of /dev/pts

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In 99.99% of the cases only root in a user namespace can mount /dev/pts
and in those cases the owner of /dev/pts/ptmx will remain root.root

In the oddball case where someone else has CAP_SYS_ADMIN this code
modifies the /dev/pts mount code to use current_fsuid and current_fsgid
as the values to use when creating the /dev/ptmx inode.  As is done
when any other file is created.

This is a code simplification, and it allows running without a root
user entirely.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

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This commit is contained in:

Eric W. Biederman 2015-12-08 00:36:51 -06:00

parent 985e5d856c

commit 93f0a88bd4

1 changed files with 4 additions and 9 deletions

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fs/devpts/inode.c

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