| Message ID | 20230303181842.1087717-21-roberto.sassu@huaweicloud.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | security: Move IMA and EVM to the LSM infrastructure | expand |
On 3/3/23 13:18, Roberto Sassu wrote: > From: Roberto Sassu <roberto.sassu@huawei.com> > > In preparation for moving IMA and EVM to the LSM infrastructure, introduce > the inode_post_set_acl hook. > > Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com> > --- > fs/posix_acl.c | 1 + > include/linux/lsm_hook_defs.h | 2 ++ > include/linux/security.h | 7 +++++++ > security/security.c | 17 +++++++++++++++++ > 4 files changed, 27 insertions(+) > > diff --git a/fs/posix_acl.c b/fs/posix_acl.c > index 5a76fb35923..acddf2dff4c 100644 > --- a/fs/posix_acl.c > +++ b/fs/posix_acl.c > @@ -1102,6 +1102,7 @@ int vfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, > error = -EOPNOTSUPP; > if (!error) { > fsnotify_xattr(dentry); > + security_inode_post_set_acl(dentry, acl_name, kacl); > evm_inode_post_set_acl(dentry, acl_name, kacl); > } > > diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h > index 5dc2a7c3d9a..9a3e14db0af 100644 > --- a/include/linux/lsm_hook_defs.h > +++ b/include/linux/lsm_hook_defs.h > @@ -156,6 +156,8 @@ LSM_HOOK(void, LSM_RET_VOID, inode_post_removexattr, struct dentry *dentry, > const char *name) > LSM_HOOK(int, 0, inode_set_acl, struct mnt_idmap *idmap, > struct dentry *dentry, const char *acl_name, struct posix_acl *kacl) > +LSM_HOOK(void, LSM_RET_VOID, inode_post_set_acl, struct dentry *dentry, > + const char *acl_name, struct posix_acl *kacl) > LSM_HOOK(int, 0, inode_get_acl, struct mnt_idmap *idmap, > struct dentry *dentry, const char *acl_name) > LSM_HOOK(int, 0, inode_remove_acl, struct mnt_idmap *idmap, > diff --git a/include/linux/security.h b/include/linux/security.h > index b3e201404dc..b0691bf7237 100644 > --- a/include/linux/security.h > +++ b/include/linux/security.h > @@ -366,6 +366,8 @@ int security_inode_setxattr(struct mnt_idmap *idmap, > int security_inode_set_acl(struct mnt_idmap *idmap, > struct dentry *dentry, const char *acl_name, > struct posix_acl *kacl); > +void security_inode_post_set_acl(struct dentry *dentry, const char *acl_name, > + struct posix_acl *kacl); > int security_inode_get_acl(struct mnt_idmap *idmap, > struct dentry *dentry, const char *acl_name); > int security_inode_remove_acl(struct mnt_idmap *idmap, > @@ -893,6 +895,11 @@ static inline int security_inode_set_acl(struct mnt_idmap *idmap, > return 0; > } > > +static inline void security_inode_post_set_acl(struct dentry *dentry, > + const char *acl_name, > + struct posix_acl *kacl) > +{ } > + > static inline int security_inode_get_acl(struct mnt_idmap *idmap, > struct dentry *dentry, > const char *acl_name) > diff --git a/security/security.c b/security/security.c > index 8883082b686..fc11d70bb02 100644 > --- a/security/security.c > +++ b/security/security.c > @@ -2310,6 +2310,23 @@ int security_inode_set_acl(struct mnt_idmap *idmap, > return evm_inode_set_acl(idmap, dentry, acl_name, kacl); > } > > +/** > + * security_inode_post_set_acl() - Update inode sec after set_acl operation 'sec' because 'security' doesn't let this fit into 80 characters for the line? Update inode security after set_acl op :-/ Update inode security after set_acl() :-) Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
diff --git a/fs/posix_acl.c b/fs/posix_acl.c index 5a76fb35923..acddf2dff4c 100644 --- a/fs/posix_acl.c +++ b/fs/posix_acl.c @@ -1102,6 +1102,7 @@ int vfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, error = -EOPNOTSUPP; if (!error) { fsnotify_xattr(dentry); + security_inode_post_set_acl(dentry, acl_name, kacl); evm_inode_post_set_acl(dentry, acl_name, kacl); } diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h index 5dc2a7c3d9a..9a3e14db0af 100644 --- a/include/linux/lsm_hook_defs.h +++ b/include/linux/lsm_hook_defs.h @@ -156,6 +156,8 @@ LSM_HOOK(void, LSM_RET_VOID, inode_post_removexattr, struct dentry *dentry, const char *name) LSM_HOOK(int, 0, inode_set_acl, struct mnt_idmap *idmap, struct dentry *dentry, const char *acl_name, struct posix_acl *kacl) +LSM_HOOK(void, LSM_RET_VOID, inode_post_set_acl, struct dentry *dentry, + const char *acl_name, struct posix_acl *kacl) LSM_HOOK(int, 0, inode_get_acl, struct mnt_idmap *idmap, struct dentry *dentry, const char *acl_name) LSM_HOOK(int, 0, inode_remove_acl, struct mnt_idmap *idmap, diff --git a/include/linux/security.h b/include/linux/security.h index b3e201404dc..b0691bf7237 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -366,6 +366,8 @@ int security_inode_setxattr(struct mnt_idmap *idmap, int security_inode_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, const char *acl_name, struct posix_acl *kacl); +void security_inode_post_set_acl(struct dentry *dentry, const char *acl_name, + struct posix_acl *kacl); int security_inode_get_acl(struct mnt_idmap *idmap, struct dentry *dentry, const char *acl_name); int security_inode_remove_acl(struct mnt_idmap *idmap, @@ -893,6 +895,11 @@ static inline int security_inode_set_acl(struct mnt_idmap *idmap, return 0; } +static inline void security_inode_post_set_acl(struct dentry *dentry, + const char *acl_name, + struct posix_acl *kacl) +{ } + static inline int security_inode_get_acl(struct mnt_idmap *idmap, struct dentry *dentry, const char *acl_name) diff --git a/security/security.c b/security/security.c index 8883082b686..fc11d70bb02 100644 --- a/security/security.c +++ b/security/security.c @@ -2310,6 +2310,23 @@ int security_inode_set_acl(struct mnt_idmap *idmap, return evm_inode_set_acl(idmap, dentry, acl_name, kacl); } +/** + * security_inode_post_set_acl() - Update inode sec after set_acl operation + * @dentry: file + * @acl_name: acl name + * @kacl: acl struct + * + * Update inode security field after successful set_acl operation on @dentry. + * The posix acls in @kacl are identified by @acl_name. + */ +void security_inode_post_set_acl(struct dentry *dentry, const char *acl_name, + struct posix_acl *kacl) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) + return; + call_void_hook(inode_post_set_acl, dentry, acl_name, kacl); +} + /** * security_inode_get_acl() - Check if reading posix acls is allowed * @idmap: idmap of the mount