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| author | Christian Brauner <christian.brauner@ubuntu.com> | 2021-01-21 14:19:38 +0100 |
|---|---|---|
| committer | Christian Brauner <christian.brauner@ubuntu.com> | 2021-01-24 14:27:19 +0100 |
| commit | 9eccd12ce7f1c063a5ff03d8b8456b2b9761c6b6 (patch) | |
| tree | b1615c0b86f989d8730ff1a111f59d3566556a17 /fs/fcntl.c | |
| parent | d06c26f196dd5b196dfa5ff9703cf6c1ce921b9d (diff) | |
| download | lwn-9eccd12ce7f1c063a5ff03d8b8456b2b9761c6b6.tar.gz lwn-9eccd12ce7f1c063a5ff03d8b8456b2b9761c6b6.zip | |
fcntl: handle idmapped mounts
Enable the setfl() helper to handle idmapped mounts by passing down the
mount's user namespace. If the initial user namespace is passed nothing
changes so non-idmapped mounts will see identical behavior as before.
Link: https://lore.kernel.org/r/20210121131959.646623-20-christian.brauner@ubuntu.com
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
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: James Morris <jamorris@linux.microsoft.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Diffstat (limited to 'fs/fcntl.c')
| -rw-r--r-- | fs/fcntl.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/fcntl.c b/fs/fcntl.c index 74d99731fd43..f6ac5285060d 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(file_mnt_user_ns(filp), inode)) return -EPERM; /* required for strict SunOS emulation */ |