cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

device_cgroup.h (1609B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#include <linux/fs.h>
      3
      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
     13
     14#if defined(CONFIG_CGROUP_DEVICE) || defined(CONFIG_CGROUP_BPF)
     15int devcgroup_check_permission(short type, u32 major, u32 minor,
     16			       short access);
     17static inline int devcgroup_inode_permission(struct inode *inode, int mask)
     18{
     19	short type, access = 0;
     20
     21	if (likely(!inode->i_rdev))
     22		return 0;
     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
     29		return 0;
     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);
     38}
     39
     40static 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
     47	if (S_ISCHR(mode) && dev == WHITEOUT_DEV)
     48		return 0;
     49
     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
     59#else
     60static inline int devcgroup_check_permission(short type, u32 major, u32 minor,
     61			       short access)
     62{ return 0; }
     63static inline int devcgroup_inode_permission(struct inode *inode, int mask)
     64{ return 0; }
     65static inline int devcgroup_inode_mknod(int mode, dev_t dev)
     66{ return 0; }
     67#endif