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authorMiklos Szeredi <mszeredi@redhat.com>2020-05-14 16:44:23 +0200
committerMiklos Szeredi <mszeredi@redhat.com>2020-05-14 16:44:23 +0200
commita3c751a50fe6bbe50eb7622a14b18b361804ee0c (patch)
treec06d4a05f89fea5d5ea3f4729ab6748140bbb77a /fs/namei.c
parent0e698dfa282211e414076f9dc7e83c1c288314fd (diff)
vfs: allow unprivileged whiteout creation
Whiteouts, unlike real device node should not require privileges to create. The general concern with device nodes is that opening them can have side effects. The kernel already avoids zero major (see Documentation/admin-guide/devices.txt). To be on the safe side the patch explicitly forbids registering a char device with 0/0 number (see cdev_add()). This guarantees that a non-O_PATH open on a whiteout will fail with ENODEV; i.e. it won't have any side effect. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c21
1 files changed, 3 insertions, 18 deletions
diff --git a/fs/namei.c b/fs/namei.c
index a320371899cf..d81f73ff1a8b 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3505,12 +3505,14 @@ EXPORT_SYMBOL(user_path_create);
int vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
{
+ bool is_whiteout = S_ISCHR(mode) && dev == WHITEOUT_DEV;
int error = may_create(dir, dentry);
if (error)
return error;
- if ((S_ISCHR(mode) || S_ISBLK(mode)) && !capable(CAP_MKNOD))
+ if ((S_ISCHR(mode) || S_ISBLK(mode)) && !is_whiteout &&
+ !capable(CAP_MKNOD))
return -EPERM;
if (!dir->i_op->mknod)
@@ -4345,9 +4347,6 @@ static int do_renameat2(int olddfd, const char __user *oldname, int newdfd,
(flags & RENAME_EXCHANGE))
return -EINVAL;
- if ((flags & RENAME_WHITEOUT) && !capable(CAP_MKNOD))
- return -EPERM;
-
if (flags & RENAME_EXCHANGE)
target_flags = 0;
@@ -4483,20 +4482,6 @@ SYSCALL_DEFINE2(rename, const char __user *, oldname, const char __user *, newna
return do_renameat2(AT_FDCWD, oldname, AT_FDCWD, newname, 0);
}
-int vfs_whiteout(struct inode *dir, struct dentry *dentry)
-{
- int error = may_create(dir, dentry);
- if (error)
- return error;
-
- if (!dir->i_op->mknod)
- return -EPERM;
-
- return dir->i_op->mknod(dir, dentry,
- S_IFCHR | WHITEOUT_MODE, WHITEOUT_DEV);
-}
-EXPORT_SYMBOL(vfs_whiteout);
-
int readlink_copy(char __user *buffer, int buflen, const char *link)
{
int len = PTR_ERR(link);