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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-18 18:50:03 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-18 18:50:03 +0000
commit01a69402cf9d38ff180345d55c2ee51c7e89fbc7 (patch)
treeb406c5242a088c4f59c6e4b719b783f43aca6ae9 /fs/btrfs/xattr.c
parentAdding upstream version 6.7.12. (diff)
downloadlinux-01a69402cf9d38ff180345d55c2ee51c7e89fbc7.tar.xz
linux-01a69402cf9d38ff180345d55c2ee51c7e89fbc7.zip
Adding upstream version 6.8.9.upstream/6.8.9
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--fs/btrfs/xattr.c55
1 files changed, 53 insertions, 2 deletions
diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c
index 3cf236fb40..6287763fdc 100644
--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -382,6 +382,53 @@ static int btrfs_xattr_handler_set(const struct xattr_handler *handler,
return btrfs_setxattr_trans(inode, name, buffer, size, flags);
}
+static int btrfs_xattr_handler_get_security(const struct xattr_handler *handler,
+ struct dentry *unused,
+ struct inode *inode,
+ const char *name, void *buffer,
+ size_t size)
+{
+ int ret;
+ bool is_cap = false;
+
+ name = xattr_full_name(handler, name);
+
+ /*
+ * security.capability doesn't cache the results, so calls into us
+ * constantly to see if there's a capability xattr. Cache the result
+ * here in order to avoid wasting time doing lookups for xattrs we know
+ * don't exist.
+ */
+ if (strcmp(name, XATTR_NAME_CAPS) == 0) {
+ is_cap = true;
+ if (test_bit(BTRFS_INODE_NO_CAP_XATTR, &BTRFS_I(inode)->runtime_flags))
+ return -ENODATA;
+ }
+
+ ret = btrfs_getxattr(inode, name, buffer, size);
+ if (ret == -ENODATA && is_cap)
+ set_bit(BTRFS_INODE_NO_CAP_XATTR, &BTRFS_I(inode)->runtime_flags);
+ return ret;
+}
+
+static int btrfs_xattr_handler_set_security(const struct xattr_handler *handler,
+ struct mnt_idmap *idmap,
+ struct dentry *unused,
+ struct inode *inode,
+ const char *name,
+ const void *buffer,
+ size_t size, int flags)
+{
+ if (btrfs_root_readonly(BTRFS_I(inode)->root))
+ return -EROFS;
+
+ name = xattr_full_name(handler, name);
+ if (strcmp(name, XATTR_NAME_CAPS) == 0)
+ clear_bit(BTRFS_INODE_NO_CAP_XATTR, &BTRFS_I(inode)->runtime_flags);
+
+ return btrfs_setxattr_trans(inode, name, buffer, size, flags);
+}
+
static int btrfs_xattr_handler_set_prop(const struct xattr_handler *handler,
struct mnt_idmap *idmap,
struct dentry *unused, struct inode *inode,
@@ -420,8 +467,8 @@ static int btrfs_xattr_handler_set_prop(const struct xattr_handler *handler,
static const struct xattr_handler btrfs_security_xattr_handler = {
.prefix = XATTR_SECURITY_PREFIX,
- .get = btrfs_xattr_handler_get,
- .set = btrfs_xattr_handler_set,
+ .get = btrfs_xattr_handler_get_security,
+ .set = btrfs_xattr_handler_set_security,
};
static const struct xattr_handler btrfs_trusted_xattr_handler = {
@@ -473,6 +520,10 @@ static int btrfs_initxattrs(struct inode *inode,
}
strcpy(name, XATTR_SECURITY_PREFIX);
strcpy(name + XATTR_SECURITY_PREFIX_LEN, xattr->name);
+
+ if (strcmp(name, XATTR_NAME_CAPS) == 0)
+ clear_bit(BTRFS_INODE_NO_CAP_XATTR, &BTRFS_I(inode)->runtime_flags);
+
err = btrfs_setxattr(trans, inode, name, xattr->value,
xattr->value_len, 0);
kfree(name);