Commit | Line | Data |
---|---|---|
b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
08ce5f16 SH |
2 | #include <linux/fs.h> |
3 | ||
ecf8fecb RG |
4 | #define DEVCG_ACC_MKNOD 1 |
5 | #define DEVCG_ACC_READ 2 | |
6 | #define DEVCG_ACC_WRITE 4 | |
7 | #define DEVCG_ACC_MASK (DEVCG_ACC_MKNOD | DEVCG_ACC_READ | DEVCG_ACC_WRITE) | |
8 | ||
9 | #define DEVCG_DEV_BLOCK 1 | |
10 | #define DEVCG_DEV_CHAR 2 | |
11 | #define DEVCG_DEV_ALL 4 /* this represents all devices */ | |
12 | ||
ecf8fecb | 13 | |
ebc614f6 | 14 | #if defined(CONFIG_CGROUP_DEVICE) || defined(CONFIG_CGROUP_BPF) |
eec8fd02 OU |
15 | int devcgroup_check_permission(short type, u32 major, u32 minor, |
16 | short access); | |
482e0cd3 AV |
17 | static inline int devcgroup_inode_permission(struct inode *inode, int mask) |
18 | { | |
ecf8fecb RG |
19 | short type, access = 0; |
20 | ||
482e0cd3 AV |
21 | if (likely(!inode->i_rdev)) |
22 | return 0; | |
ecf8fecb RG |
23 | |
24 | if (S_ISBLK(inode->i_mode)) | |
25 | type = DEVCG_DEV_BLOCK; | |
26 | else if (S_ISCHR(inode->i_mode)) | |
27 | type = DEVCG_DEV_CHAR; | |
28 | else | |
482e0cd3 | 29 | return 0; |
ecf8fecb RG |
30 | |
31 | if (mask & MAY_WRITE) | |
32 | access |= DEVCG_ACC_WRITE; | |
33 | if (mask & MAY_READ) | |
34 | access |= DEVCG_ACC_READ; | |
35 | ||
36 | return devcgroup_check_permission(type, imajor(inode), iminor(inode), | |
37 | access); | |
482e0cd3 | 38 | } |
ecf8fecb RG |
39 | |
40 | static inline int devcgroup_inode_mknod(int mode, dev_t dev) | |
41 | { | |
42 | short type; | |
43 | ||
44 | if (!S_ISBLK(mode) && !S_ISCHR(mode)) | |
45 | return 0; | |
46 | ||
a3c751a5 MS |
47 | if (S_ISCHR(mode) && dev == WHITEOUT_DEV) |
48 | return 0; | |
49 | ||
ecf8fecb RG |
50 | if (S_ISBLK(mode)) |
51 | type = DEVCG_DEV_BLOCK; | |
52 | else | |
53 | type = DEVCG_DEV_CHAR; | |
54 | ||
55 | return devcgroup_check_permission(type, MAJOR(dev), MINOR(dev), | |
56 | DEVCG_ACC_MKNOD); | |
57 | } | |
58 | ||
08ce5f16 | 59 | #else |
eec8fd02 OU |
60 | static inline int devcgroup_check_permission(short type, u32 major, u32 minor, |
61 | short access) | |
62 | { return 0; } | |
08ce5f16 SH |
63 | static inline int devcgroup_inode_permission(struct inode *inode, int mask) |
64 | { return 0; } | |
65 | static inline int devcgroup_inode_mknod(int mode, dev_t dev) | |
66 | { return 0; } | |
67 | #endif |