diff options
Diffstat (limited to 'security')
| -rwxr-xr-x | security/trustees/security.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/security/trustees/security.c b/security/trustees/security.c index bbc98886243..d59d71a9752 100755 --- a/security/trustees/security.c +++ b/security/trustees/security.c @@ -46,6 +46,7 @@ static int trustees_capable(struct task_struct *tsk, const struct cred *cred, int cap, int audit); static int trustees_inode_permission(struct inode *inode, int mask); +static int trustees_inode_setattr(struct dentry *dentry, struct iattr *attr); /* Checks if user has access to the inode due to root status */ @@ -243,6 +244,7 @@ static int trustees_inode_link(struct dentry *old_dentry, struct security_operations trustees_security_ops = { .capable = trustees_capable, .inode_permission = trustees_inode_permission, + .inode_setattr = trustees_inode_setattr, .inode_link = trustees_inode_link, .inode_rename = trustees_inode_rename }; @@ -341,6 +343,17 @@ out_path: return ret; } +static int trustees_inode_setattr(struct dentry *dentry, struct iattr *attr) +{ + unsigned int ia_valid = attr->ia_valid; + int ret = 0; + /* This covers the case of setting the inode time (CAP_FOWNER). */ + if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) { + ret = trustees_inode_permission(dentry->d_inode, MAY_WRITE); + } + return ret; +} + /* We should only allow hard links under one of two conditions: * 1. Its in the same trustee * - if the two dentries are covered by the same trustee, there shouldn't @@ -398,7 +411,7 @@ static int trustees_capable(struct task_struct *tsk, const struct cred *cred, int cap, int audit) { - if (cap == CAP_DAC_OVERRIDE) + if (cap == CAP_DAC_OVERRIDE || cap == CAP_FOWNER) return 0; return cap_capable(tsk, cred, cap, audit); |