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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
08ce5f16 | 2 | #include <linux/fs.h> |
ebc614f6 | 3 | #include <linux/bpf-cgroup.h> |
08ce5f16 | 4 | |
ecf8fecb RG |
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 | |
15 | extern int __devcgroup_check_permission(short type, u32 major, u32 minor, | |
16 | short access); | |
17 | #else | |
18 | static inline int __devcgroup_check_permission(short type, u32 major, u32 minor, | |
19 | short access) | |
20 | { return 0; } | |
21 | #endif | |
22 | ||
ebc614f6 | 23 | #if defined(CONFIG_CGROUP_DEVICE) || defined(CONFIG_CGROUP_BPF) |
ecf8fecb RG |
24 | static inline int devcgroup_check_permission(short type, u32 major, u32 minor, |
25 | short access) | |
26 | { | |
ebc614f6 RG |
27 | int rc = BPF_CGROUP_RUN_PROG_DEVICE_CGROUP(type, major, minor, access); |
28 | ||
29 | if (rc) | |
30 | return -EPERM; | |
31 | ||
ecf8fecb RG |
32 | return __devcgroup_check_permission(type, major, minor, access); |
33 | } | |
34 | ||
482e0cd3 AV |
35 | static inline int devcgroup_inode_permission(struct inode *inode, int mask) |
36 | { | |
ecf8fecb RG |
37 | short type, access = 0; |
38 | ||
482e0cd3 AV |
39 | if (likely(!inode->i_rdev)) |
40 | return 0; | |
ecf8fecb RG |
41 | |
42 | if (S_ISBLK(inode->i_mode)) | |
43 | type = DEVCG_DEV_BLOCK; | |
44 | else if (S_ISCHR(inode->i_mode)) | |
45 | type = DEVCG_DEV_CHAR; | |
46 | else | |
482e0cd3 | 47 | return 0; |
ecf8fecb RG |
48 | |
49 | if (mask & MAY_WRITE) | |
50 | access |= DEVCG_ACC_WRITE; | |
51 | if (mask & MAY_READ) | |
52 | access |= DEVCG_ACC_READ; | |
53 | ||
54 | return devcgroup_check_permission(type, imajor(inode), iminor(inode), | |
55 | access); | |
482e0cd3 | 56 | } |
ecf8fecb RG |
57 | |
58 | static inline int devcgroup_inode_mknod(int mode, dev_t dev) | |
59 | { | |
60 | short type; | |
61 | ||
62 | if (!S_ISBLK(mode) && !S_ISCHR(mode)) | |
63 | return 0; | |
64 | ||
65 | if (S_ISBLK(mode)) | |
66 | type = DEVCG_DEV_BLOCK; | |
67 | else | |
68 | type = DEVCG_DEV_CHAR; | |
69 | ||
70 | return devcgroup_check_permission(type, MAJOR(dev), MINOR(dev), | |
71 | DEVCG_ACC_MKNOD); | |
72 | } | |
73 | ||
08ce5f16 SH |
74 | #else |
75 | static inline int devcgroup_inode_permission(struct inode *inode, int mask) | |
76 | { return 0; } | |
77 | static inline int devcgroup_inode_mknod(int mode, dev_t dev) | |
78 | { return 0; } | |
79 | #endif |