diff options
Diffstat (limited to 'include/linux/sysfs.h')
| -rw-r--r-- | include/linux/sysfs.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h index c33a96b7391a..99b775f3ff46 100644 --- a/include/linux/sysfs.h +++ b/include/linux/sysfs.h @@ -808,4 +808,17 @@ static inline void sysfs_put(struct kernfs_node *kn) kernfs_put(kn); } +/* Permissions on a sysfs file: you didn't miss the 0 prefix did you? */ +#define VERIFY_OCTAL_PERMISSIONS(perms) \ + (BUILD_BUG_ON_ZERO((perms) < 0) + \ + BUILD_BUG_ON_ZERO((perms) > 0777) + \ + /* USER_READABLE >= GROUP_READABLE >= OTHER_READABLE */ \ + BUILD_BUG_ON_ZERO((((perms) >> 6) & 4) < (((perms) >> 3) & 4)) + \ + BUILD_BUG_ON_ZERO((((perms) >> 3) & 4) < ((perms) & 4)) + \ + /* USER_WRITABLE >= GROUP_WRITABLE */ \ + BUILD_BUG_ON_ZERO((((perms) >> 6) & 2) < (((perms) >> 3) & 2)) + \ + /* OTHER_WRITABLE? Generally considered a bad idea. */ \ + BUILD_BUG_ON_ZERO((perms) & 2) + \ + (perms)) + #endif /* _SYSFS_H_ */ |