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lsm,selinux: add new hook to compare new mount to an existing mount

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Add a new hook that takes an existing super block and a new mount
with new options and determines if new options confict with an
existing mount or not.

A filesystem can use this new hook to determine if it can share
the an existing superblock with a new superblock for the new mount.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Acked-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
[PM: tweak the subject line, fix tab/space problems]
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Olga Kornievskaia
2021-02-26 22:37:55 -05:00
committed by Paul Moore
parent 431c3be16b
commit 69c4a42d72
5 changed files with 78 additions and 0 deletions
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6
include/linux/lsm_hooks.h
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@@ -142,6 +142,12 @@
* @orig the original mount data copied from userspace.
* @copy copied data which will be passed to the security module.
* Returns 0 if the copy was successful.
* @sb_mnt_opts_compat:
* Determine if the new mount options in @mnt_opts are allowed given
* the existing mounted filesystem at @sb.
* @sb superblock being compared
* @mnt_opts new mount options
* Return 0 if options are compatible.
* @sb_remount:
* Extracts security system specific mount options and verifies no changes
* are being made to those options.