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inode: make init and permission helpers idmapped mount aware

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The inode_owner_or_capable() helper determines whether the caller is the
owner of the inode or is capable with respect to that inode. Allow it to
handle idmapped mounts. If the inode is accessed through an idmapped
mount it according to the mount's user namespace. Afterwards the 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.

Similarly, allow the inode_init_owner() helper to handle idmapped
mounts. It initializes a new inode on idmapped mounts by mapping the
fsuid and fsgid of the caller from 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/20210121131959.646623-7-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>
This commit is contained in:
Christian Brauner
2021-01-21 14:19:25 +01:00
parent 47291baa8d
commit 21cb47be6f
54 changed files with 112 additions and 91 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
fs/f2fs/file.c
View File

@@ -1961,7 +1961,7 @@ static int f2fs_ioc_setflags(struct file *filp, unsigned long arg)
u32 iflags;
int ret;
if (!inode_owner_or_capable(inode))
if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
if (get_user(fsflags, (int __user *)arg))
@@ -2008,7 +2008,7 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
int ret;
if (!inode_owner_or_capable(inode))
if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
if (!S_ISREG(inode->i_mode))
@@ -2075,7 +2075,7 @@ static int f2fs_ioc_commit_atomic_write(struct file *filp)
struct inode *inode = file_inode(filp);
int ret;
if (!inode_owner_or_capable(inode))
if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
ret = mnt_want_write_file(filp);
@@ -2117,7 +2117,7 @@ static int f2fs_ioc_start_volatile_write(struct file *filp)
struct inode *inode = file_inode(filp);
int ret;
if (!inode_owner_or_capable(inode))
if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
if (!S_ISREG(inode->i_mode))
@@ -2152,7 +2152,7 @@ static int f2fs_ioc_release_volatile_write(struct file *filp)
struct inode *inode = file_inode(filp);
int ret;
if (!inode_owner_or_capable(inode))
if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
ret = mnt_want_write_file(filp);
@@ -2181,7 +2181,7 @@ static int f2fs_ioc_abort_volatile_write(struct file *filp)
struct inode *inode = file_inode(filp);
int ret;
if (!inode_owner_or_capable(inode))
if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
ret = mnt_want_write_file(filp);
@@ -3158,7 +3158,7 @@ static int f2fs_ioc_fssetxattr(struct file *filp, unsigned long arg)
return -EFAULT;
/* Make sure caller has proper permission */
if (!inode_owner_or_capable(inode))
if (!inode_owner_or_capable(&init_user_ns, inode))
return -EACCES;
if (fa.fsx_xflags & ~F2FS_SUPPORTED_XFLAGS)