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| author |   Christian Brauner <christian.brauner@ubuntu.com> | 2021-01-21 14:19:34 +0100 |
|---|---|---|
| committer | Christian Brauner <christian.brauner@ubuntu.com> | 2021-01-24 14:27:18 +0100 |
| commit | 643fe55a0679ae5582a1a2a1df86dc240292cd1b (patch) | |
| tree | 48f1b5b8ed624ca70008a8ec9b82147a60e2865c /include/linux/fs.h | |
| parent | namei: prepare for idmapped mounts (diff) | |
| download | linux-dev-643fe55a0679ae5582a1a2a1df86dc240292cd1b.tar.xz linux-dev-643fe55a0679ae5582a1a2a1df86dc240292cd1b.zip | |
open: handle idmapped mounts in do_truncate()
When truncating files the vfs will verify that the caller is privileged
over the inode. Extend it to handle idmapped mounts. If the inode is
accessed through an idmapped mount it is mapped according to the mount's
user namespace. Afterwards the permissions checks are identical to
non-idmapped mounts. 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/20210121131959.646623-16-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>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Diffstat (limited to '')
| -rw-r--r-- | include/linux/fs.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 29d7b2fe7de4..f0601cca1930 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2593,8 +2593,8 @@ static inline struct user_namespace *file_mnt_user_ns(struct file *file) return mnt_user_ns(file->f_path.mnt); } extern long vfs_truncate(const struct path *, loff_t); -extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, - struct file *filp); +int do_truncate(struct user_namespace *, struct dentry *, loff_t start, + unsigned int time_attrs, struct file *filp); extern int vfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len); extern long do_sys_open(int dfd, const char __user *filename, int flags, |