path: root/security
diff options
authorVivek Goyal <>2021-10-12 09:23:07 -0400
committerPaul Moore <>2021-10-20 08:17:08 -0400
commit15bf32398ad488c0df1cbaf16431422c87e4feea (patch)
tree987fb67442d6622e4646760cca87b15b459acfa1 /security
parent1c73213ba991d26a91282e775d1f5a60e41e5184 (diff)
security: Return xattr name from security_dentry_init_security()
Right now security_dentry_init_security() only supports single security label and is used by SELinux only. There are two users of this hook, namely ceph and nfs. NFS does not care about xattr name. Ceph hardcodes the xattr name to security.selinux (XATTR_NAME_SELINUX). I am making changes to fuse/virtiofs to send security label to virtiofsd and I need to send xattr name as well. I also hardcoded the name of xattr to security.selinux. Stephen Smalley suggested that it probably is a good idea to modify security_dentry_init_security() to also return name of xattr so that we can avoid this hardcoding in the callers. This patch adds a new parameter "const char **xattr_name" to security_dentry_init_security() and LSM puts the name of xattr too if caller asked for it (xattr_name != NULL). Signed-off-by: Vivek Goyal <> Reviewed-by: Jeff Layton <> Reviewed-by: Christian Brauner <> Acked-by: James Morris <> [PM: fixed typos in the commit description] Signed-off-by: Paul Moore <>
Diffstat (limited to 'security')
2 files changed, 9 insertions, 4 deletions
diff --git a/security/security.c b/security/security.c
index d9d53c1e466a..95e30fadba78 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1052,11 +1052,12 @@ void security_inode_free(struct inode *inode)
int security_dentry_init_security(struct dentry *dentry, int mode,
- const struct qstr *name, void **ctx,
- u32 *ctxlen)
+ const struct qstr *name,
+ const char **xattr_name, void **ctx,
+ u32 *ctxlen)
return call_int_hook(dentry_init_security, -EOPNOTSUPP, dentry, mode,
- name, ctx, ctxlen);
+ name, xattr_name, ctx, ctxlen);
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 6f08cd2fc6a8..1af2fbc08588 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2927,7 +2927,8 @@ static void selinux_inode_free_security(struct inode *inode)
static int selinux_dentry_init_security(struct dentry *dentry, int mode,
- const struct qstr *name, void **ctx,
+ const struct qstr *name,
+ const char **xattr_name, void **ctx,
u32 *ctxlen)
u32 newsid;
@@ -2940,6 +2941,9 @@ static int selinux_dentry_init_security(struct dentry *dentry, int mode,
if (rc)
return rc;
+ if (xattr_name)
+ *xattr_name = XATTR_NAME_SELINUX;
return security_sid_to_context(&selinux_state, newsid, (char **)ctx,