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debugfs: add mode, uid and gid options

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Cautious admins may want to restrict access to debugfs. Currently a
manual chown/chmod e.g. in an init script is needed to achieve that.
Distributions that want to make the mount options configurable need
to add extra config files. By allowing to set the root inode's uid,
gid and mode via mount options no such hacks are needed anymore.
Instead configuration becomes straight forward via fstab.

Signed-off-by: Ludwig Nussel <ludwig.nussel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Ludwig Nussel
2012-01-25 11:52:28 +01:00
committed by Greg Kroah-Hartman
parent 9875bb480c
commit d6e486868c
2 changed files with 152 additions and 2 deletions
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5
Documentation/filesystems/debugfs.txt
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@@ -14,7 +14,10 @@ Debugfs is typically mounted with a command like:
mount -t debugfs none /sys/kernel/debug
(Or an equivalent /etc/fstab line).
(Or an equivalent /etc/fstab line).
The debugfs root directory is accessible by anyone by default. To
restrict access to the tree the "uid", "gid" and "mode" mount
options can be used.
Note that the debugfs API is exported GPL-only to modules.