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fuse: handle killpriv in userspace fs

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Only userspace filesystem can do the killing of suid/sgid without races.
So introduce an INIT flag and negotiate support for this.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2016-10-01 07:32:32 +02:00
commit 5e940c1dd3
4 changed files with 39 additions and 19 deletions
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7
include/uapi/linux/fuse.h
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@ -108,6 +108,9 @@
*
* 7.25
* - add FUSE_PARALLEL_DIROPS
*
* 7.26
* - add FUSE_HANDLE_KILLPRIV
*/
#ifndef _LINUX_FUSE_H
@ -143,7 +146,7 @@
#define FUSE_KERNEL_VERSION 7
/** Minor version number of this interface */
#define FUSE_KERNEL_MINOR_VERSION 25
#define FUSE_KERNEL_MINOR_VERSION 26
/** The node ID of the root inode */
#define FUSE_ROOT_ID 1
@ -238,6 +241,7 @@ struct fuse_file_lock {
* FUSE_WRITEBACK_CACHE: use writeback cache for buffered writes
* FUSE_NO_OPEN_SUPPORT: kernel supports zero-message opens
* FUSE_PARALLEL_DIROPS: allow parallel lookups and readdir
* FUSE_HANDLE_KILLPRIV: fs handles killing suid/sgid/cap on write/chown/trunc
*/
#define FUSE_ASYNC_READ (1 << 0)
#define FUSE_POSIX_LOCKS (1 << 1)
@ -258,6 +262,7 @@ struct fuse_file_lock {
#define FUSE_WRITEBACK_CACHE (1 << 16)
#define FUSE_NO_OPEN_SUPPORT (1 << 17)
#define FUSE_PARALLEL_DIROPS (1 << 18)
#define FUSE_HANDLE_KILLPRIV (1 << 19)
/**
* CUSE INIT request/reply flags