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| author | Vivek Goyal <vgoyal@redhat.com> | 2016-07-13 10:44:52 -0400 |
|---|---|---|
| committer | Paul Moore <paul@paul-moore.com> | 2016-08-08 20:46:46 -0400 |
| commit | 2602625b7e46576b00db619ac788c508ba3bcb2c (patch) | |
| tree | a5e24e683c7a4e7cc0b93bdf4513c7601ced1966 /security | |
| parent | c957f6df52c509ccfbb96659fd1a0f7812de333f (diff) | |
| download | linux-2602625b7e46576b00db619ac788c508ba3bcb2c.tar.bz2 | |
security, overlayfs: Provide hook to correctly label newly created files
During a new file creation we need to make sure new file is created with the
right label. New file is created in upper/ so effectively file should get
label as if task had created file in upper/.
We switched to mounter's creds for actual file creation. Also if there is a
whiteout present, then file will be created in work/ dir first and then
renamed in upper. In none of the cases file will be labeled as we want it to
be.
This patch introduces a new hook dentry_create_files_as(), which determines
the label/context dentry will get if it had been created by task in upper
and modify passed set of creds appropriately. Caller makes use of these new
creds for file creation.
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
[PM: fix whitespace issues found with checkpatch.pl]
[PM: changes to use stat->mode in ovl_create_or_link()]
Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'security')
| -rw-r--r-- | security/security.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/security/security.c b/security/security.c index a9e2bb9fb9d3..f825304f04a7 100644 --- a/security/security.c +++ b/security/security.c @@ -364,6 +364,15 @@ int security_dentry_init_security(struct dentry *dentry, int mode, } EXPORT_SYMBOL(security_dentry_init_security); +int security_dentry_create_files_as(struct dentry *dentry, int mode, + struct qstr *name, + const struct cred *old, struct cred *new) +{ + return call_int_hook(dentry_create_files_as, 0, dentry, mode, + name, old, new); +} +EXPORT_SYMBOL(security_dentry_create_files_as); + int security_inode_init_security(struct inode *inode, struct inode *dir, const struct qstr *qstr, const initxattrs initxattrs, void *fs_data) @@ -1635,6 +1644,8 @@ struct security_hook_heads security_hook_heads = { LIST_HEAD_INIT(security_hook_heads.sb_parse_opts_str), .dentry_init_security = LIST_HEAD_INIT(security_hook_heads.dentry_init_security), + .dentry_create_files_as = + LIST_HEAD_INIT(security_hook_heads.dentry_create_files_as), #ifdef CONFIG_SECURITY_PATH .path_unlink = LIST_HEAD_INIT(security_hook_heads.path_unlink), .path_mkdir = LIST_HEAD_INIT(security_hook_heads.path_mkdir), |