From 0ac6075a32fc05bc7fa025965914e8dcd448a668 Mon Sep 17 00:00:00 2001 From: Ondrej Mosnacek Date: Fri, 22 Feb 2019 15:57:15 +0100 Subject: kernfs: use simple_xattrs for security attributes Replace the special handling of security xattrs with simple_xattrs, as is already done for the trusted xattrs. This simplifies the code and allows LSMs to use more than just a single xattr to do their business. Signed-off-by: Ondrej Mosnacek Acked-by: Casey Schaufler [PM: manual merge fixes] Signed-off-by: Paul Moore --- fs/kernfs/dir.c | 3 --- fs/kernfs/inode.c | 55 ++------------------------------------------- fs/kernfs/kernfs-internal.h | 2 -- 3 files changed, 2 insertions(+), 58 deletions(-) diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c index 1654d9136458..bd48e315347b 100644 --- a/fs/kernfs/dir.c +++ b/fs/kernfs/dir.c @@ -532,9 +532,6 @@ void kernfs_put(struct kernfs_node *kn) kfree_const(kn->name); if (kn->iattr) { - if (kn->iattr->ia_secdata) - security_release_secctx(kn->iattr->ia_secdata, - kn->iattr->ia_secdata_len); simple_xattrs_free(&kn->iattr->xattrs); kmem_cache_free(kernfs_iattrs_cache, kn->iattr); } diff --git a/fs/kernfs/inode.c b/fs/kernfs/inode.c index 5c5569fb2110..a365088caa3c 100644 --- a/fs/kernfs/inode.c +++ b/fs/kernfs/inode.c @@ -137,23 +137,6 @@ out: return error; } -static int kernfs_node_setsecdata(struct kernfs_iattrs *attrs, void **secdata, - u32 *secdata_len) -{ - void *old_secdata; - size_t old_secdata_len; - - old_secdata = attrs->ia_secdata; - old_secdata_len = attrs->ia_secdata_len; - - attrs->ia_secdata = *secdata; - attrs->ia_secdata_len = *secdata_len; - - *secdata = old_secdata; - *secdata_len = old_secdata_len; - return 0; -} - ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size) { struct kernfs_node *kn = kernfs_dentry_node(dentry); @@ -189,15 +172,12 @@ static void kernfs_refresh_inode(struct kernfs_node *kn, struct inode *inode) struct kernfs_iattrs *attrs = kn->iattr; inode->i_mode = kn->mode; - if (attrs) { + if (attrs) /* * kernfs_node has non-default attributes get them from * persistent copy in kernfs_node. */ set_inode_attr(inode, attrs); - security_inode_notifysecctx(inode, attrs->ia_secdata, - attrs->ia_secdata_len); - } if (kernfs_type(kn) == KERNFS_DIR) set_nlink(inode, kn->dir.subdirs + 2); @@ -345,41 +325,10 @@ static const struct xattr_handler kernfs_trusted_xattr_handler = { .set = kernfs_xattr_set, }; -static int kernfs_security_xattr_set(const struct xattr_handler *handler, - struct dentry *unused, struct inode *inode, - const char *suffix, const void *value, - size_t size, int flags) -{ - struct kernfs_node *kn = inode->i_private; - struct kernfs_iattrs *attrs; - void *secdata; - u32 secdata_len = 0; - int error; - - attrs = kernfs_iattrs(kn); - if (!attrs) - return -ENOMEM; - - error = security_inode_setsecurity(inode, suffix, value, size, flags); - if (error) - return error; - error = security_inode_getsecctx(inode, &secdata, &secdata_len); - if (error) - return error; - - mutex_lock(&kernfs_mutex); - error = kernfs_node_setsecdata(attrs, &secdata, &secdata_len); - mutex_unlock(&kernfs_mutex); - - if (secdata) - security_release_secctx(secdata, secdata_len); - return error; -} - static const struct xattr_handler kernfs_security_xattr_handler = { .prefix = XATTR_SECURITY_PREFIX, .get = kernfs_xattr_get, - .set = kernfs_security_xattr_set, + .set = kernfs_xattr_set, }; const struct xattr_handler *kernfs_xattr_handlers[] = { diff --git a/fs/kernfs/kernfs-internal.h b/fs/kernfs/kernfs-internal.h index 385a5ca0b2f6..3c437990f39a 100644 --- a/fs/kernfs/kernfs-internal.h +++ b/fs/kernfs/kernfs-internal.h @@ -25,8 +25,6 @@ struct kernfs_iattrs { struct timespec64 ia_atime; struct timespec64 ia_mtime; struct timespec64 ia_ctime; - void *ia_secdata; - u32 ia_secdata_len; struct simple_xattrs xattrs; }; -- cgit v1.2.3-70-g09d2