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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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8
include/linux/security.h
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@@ -294,6 +294,7 @@ int security_sb_alloc(struct super_block *sb);
void security_sb_free(struct super_block *sb);
void security_free_mnt_opts(void **mnt_opts);
int security_sb_eat_lsm_opts(char *options, void **mnt_opts);
int security_sb_mnt_opts_compat(struct super_block *sb, void *mnt_opts);
int security_sb_remount(struct super_block *sb, void *mnt_opts);
int security_sb_kern_mount(struct super_block *sb);
int security_sb_show_options(struct seq_file *m, struct super_block *sb);
@@ -646,6 +647,13 @@ static inline int security_sb_remount(struct super_block *sb,
return 0;
}
static inline int security_sb_mnt_opts_compat(struct super_block *sb,
void *mnt_opts)
{
return 0;
}
static inline int security_sb_kern_mount(struct super_block *sb)
{
return 0;