| /* 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 |