68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
#include <linux/fs.h>
|
||
|
|
|
||
|
|
#define DEVCG_ACC_MKNOD 1
|
||
|
|
#define DEVCG_ACC_READ 2
|
||
|
|
#define DEVCG_ACC_WRITE 4
|
||
|
|
#define DEVCG_ACC_MASK (DEVCG_ACC_MKNOD | DEVCG_ACC_READ | DEVCG_ACC_WRITE)
|
||
|
|
|
||
|
|
#define DEVCG_DEV_BLOCK 1
|
||
|
|
#define DEVCG_DEV_CHAR 2
|
||
|
|
#define DEVCG_DEV_ALL 4 /* this represents all devices */
|
||
|
|
|
||
|
|
|
||
|
|
#if defined(CONFIG_CGROUP_DEVICE) || defined(CONFIG_CGROUP_BPF)
|
||
|
|
int devcgroup_check_permission(short type, u32 major, u32 minor,
|
||
|
|
short access);
|
||
|
|
static inline int devcgroup_inode_permission(struct inode *inode, int mask)
|
||
|
|
{
|
||
|
|
short type, access = 0;
|
||
|
|
|
||
|
|
if (likely(!inode->i_rdev))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
if (S_ISBLK(inode->i_mode))
|
||
|
|
type = DEVCG_DEV_BLOCK;
|
||
|
|
else if (S_ISCHR(inode->i_mode))
|
||
|
|
type = DEVCG_DEV_CHAR;
|
||
|
|
else
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
if (mask & MAY_WRITE)
|
||
|
|
access |= DEVCG_ACC_WRITE;
|
||
|
|
if (mask & MAY_READ)
|
||
|
|
access |= DEVCG_ACC_READ;
|
||
|
|
|
||
|
|
return devcgroup_check_permission(type, imajor(inode), iminor(inode),
|
||
|
|
access);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int devcgroup_inode_mknod(int mode, dev_t dev)
|
||
|
|
{
|
||
|
|
short type;
|
||
|
|
|
||
|
|
if (!S_ISBLK(mode) && !S_ISCHR(mode))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
if (S_ISCHR(mode) && dev == WHITEOUT_DEV)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
if (S_ISBLK(mode))
|
||
|
|
type = DEVCG_DEV_BLOCK;
|
||
|
|
else
|
||
|
|
type = DEVCG_DEV_CHAR;
|
||
|
|
|
||
|
|
return devcgroup_check_permission(type, MAJOR(dev), MINOR(dev),
|
||
|
|
DEVCG_ACC_MKNOD);
|
||
|
|
}
|
||
|
|
|
||
|
|
#else
|
||
|
|
static inline int devcgroup_check_permission(short type, u32 major, u32 minor,
|
||
|
|
short access)
|
||
|
|
{ return 0; }
|
||
|
|
static inline int devcgroup_inode_permission(struct inode *inode, int mask)
|
||
|
|
{ return 0; }
|
||
|
|
static inline int devcgroup_inode_mknod(int mode, dev_t dev)
|
||
|
|
{ return 0; }
|
||
|
|
#endif
|