Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#include <linux/fs.h>
3#include <linux/bpf-cgroup.h>
4
5#define DEVCG_ACC_MKNOD 1
6#define DEVCG_ACC_READ 2
7#define DEVCG_ACC_WRITE 4
8#define DEVCG_ACC_MASK (DEVCG_ACC_MKNOD | DEVCG_ACC_READ | DEVCG_ACC_WRITE)
9
10#define DEVCG_DEV_BLOCK 1
11#define DEVCG_DEV_CHAR 2
12#define DEVCG_DEV_ALL 4 /* this represents all devices */
13
14#ifdef CONFIG_CGROUP_DEVICE
15int devcgroup_check_permission(short type, u32 major, u32 minor,
16 short access);
17#else
18static inline int devcgroup_check_permission(short type, u32 major, u32 minor,
19 short access)
20{ return 0; }
21#endif
22
23#if defined(CONFIG_CGROUP_DEVICE) || defined(CONFIG_CGROUP_BPF)
24static inline int devcgroup_inode_permission(struct inode *inode, int mask)
25{
26 short type, access = 0;
27
28 if (likely(!inode->i_rdev))
29 return 0;
30
31 if (S_ISBLK(inode->i_mode))
32 type = DEVCG_DEV_BLOCK;
33 else if (S_ISCHR(inode->i_mode))
34 type = DEVCG_DEV_CHAR;
35 else
36 return 0;
37
38 if (mask & MAY_WRITE)
39 access |= DEVCG_ACC_WRITE;
40 if (mask & MAY_READ)
41 access |= DEVCG_ACC_READ;
42
43 return devcgroup_check_permission(type, imajor(inode), iminor(inode),
44 access);
45}
46
47static inline int devcgroup_inode_mknod(int mode, dev_t dev)
48{
49 short type;
50
51 if (!S_ISBLK(mode) && !S_ISCHR(mode))
52 return 0;
53
54 if (S_ISBLK(mode))
55 type = DEVCG_DEV_BLOCK;
56 else
57 type = DEVCG_DEV_CHAR;
58
59 return devcgroup_check_permission(type, MAJOR(dev), MINOR(dev),
60 DEVCG_ACC_MKNOD);
61}
62
63#else
64static inline int devcgroup_inode_permission(struct inode *inode, int mask)
65{ return 0; }
66static inline int devcgroup_inode_mknod(int mode, dev_t dev)
67{ return 0; }
68#endif