| /* 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(!S_ISBLK(inode->i_mode) && !S_ISCHR(inode->i_mode))) | |
| return 0; | |
| if (!inode->i_rdev) | |
| return 0; | |
| if (S_ISBLK(inode->i_mode)) | |
| type = DEVCG_DEV_BLOCK; | |
| else /* S_ISCHR by the test above */ | |
| type = DEVCG_DEV_CHAR; | |
| 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 |