[PATCH v2 23/39] fcntl: handle idmapped mounts
From: Christian Brauner <hidden>
Date: 2020-11-15 10:49:23
Also in:
linux-ext4, linux-fsdevel, linux-integrity, linux-security-module, selinux
Subsystem:
file locking (flock() and fcntl()/lockf()), filesystems (vfs and infrastructure), the rest · Maintainers:
Jeff Layton, Chuck Lever, Alexander Viro, Christian Brauner, Linus Torvalds
Enable the setfl() helper to handle idmapped mounts by passing down the mount's user namespace. Cc: Christoph Hellwig <hch@lst.de> Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner <redacted> --- /* v2 */ patch introduced --- fs/fcntl.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/fcntl.c b/fs/fcntl.c
index df091d435603..ed330fa91438 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c@@ -25,6 +25,7 @@ #include <linux/user_namespace.h> #include <linux/memfd.h> #include <linux/compat.h> +#include <linux/mount.h> #include <linux/poll.h> #include <asm/siginfo.h>
@@ -46,7 +47,7 @@ static int setfl(int fd, struct file * filp, unsigned long arg) /* O_NOATIME can only be set by the owner or superuser */ if ((arg & O_NOATIME) && !(filp->f_flags & O_NOATIME)) - if (!inode_owner_or_capable(&init_user_ns, inode)) + if (!inode_owner_or_capable(mnt_user_ns(filp->f_path.mnt), inode)) return -EPERM; /* required for strict SunOS emulation */
--
2.29.2