Commit 3bd858ab authored by Satyam Sharma's avatar Satyam Sharma Committed by Linus Torvalds
Browse files

Introduce is_owner_or_cap() to wrap CAP_FOWNER use with fsuid check



Introduce is_owner_or_cap() macro in fs.h, and convert over relevant
users to it. This is done because we want to avoid bugs in the future
where we check for only effective fsuid of the current task against a
file's owning uid, without simultaneously checking for CAP_FOWNER as
well, thus violating its semantics.
[ XFS uses special macros and structures, and in general looked ...
untouchable, so we leave it alone -- but it has been looked over. ]

The (current->fsuid != inode->i_uid) check in generic_permission() and
exec_permission_lite() is left alone, because those operations are
covered by CAP_DAC_OVERRIDE and CAP_DAC_READ_SEARCH. Similarly operations
falling under the purview of CAP_CHOWN and CAP_LEASE are also left alone.
Signed-off-by: default avatarSatyam Sharma <ssatyam@cse.iitk.ac.in>
Cc: Al Viro <viro@ftp.linux.org.uk>
Acked-by: default avatarSerge E. Hallyn <serge@hallyn.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 49c13b51
......@@ -42,7 +42,7 @@ int inode_change_ok(struct inode *inode, struct iattr *attr)
/* Make sure a caller can chmod. */
if (ia_valid & ATTR_MODE) {
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
goto error;
/* Also check the setgid bit! */
if (!in_group_p((ia_valid & ATTR_GID) ? attr->ia_gid :
......@@ -52,7 +52,7 @@ int inode_change_ok(struct inode *inode, struct iattr *attr)
/* Check for setting the inode time. */
if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET)) {
if (current->fsuid != inode->i_uid && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
goto error;
}
fine:
......
......@@ -464,7 +464,7 @@ ext2_xattr_set_acl(struct inode *inode, int type, const void *value,
if (!test_opt(inode->i_sb, POSIX_ACL))
return -EOPNOTSUPP;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EPERM;
if (value) {
......
......@@ -36,7 +36,7 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
if (IS_RDONLY(inode))
return -EROFS;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EACCES;
if (get_user(flags, (int __user *) arg))
......@@ -74,7 +74,7 @@ int ext2_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
case EXT2_IOC_GETVERSION:
return put_user(inode->i_generation, (int __user *) arg);
case EXT2_IOC_SETVERSION:
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EPERM;
if (IS_RDONLY(inode))
return -EROFS;
......
......@@ -489,7 +489,7 @@ ext3_xattr_set_acl(struct inode *inode, int type, const void *value,
if (!test_opt(inode->i_sb, POSIX_ACL))
return -EOPNOTSUPP;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EPERM;
if (value) {
......
......@@ -41,7 +41,7 @@ int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
if (IS_RDONLY(inode))
return -EROFS;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EACCES;
if (get_user(flags, (int __user *) arg))
......@@ -122,7 +122,7 @@ flags_err:
__u32 generation;
int err;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EPERM;
if (IS_RDONLY(inode))
return -EROFS;
......@@ -181,7 +181,7 @@ flags_err:
if (IS_RDONLY(inode))
return -EROFS;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EACCES;
if (get_user(rsv_window_size, (int __user *)arg))
......
......@@ -489,7 +489,7 @@ ext4_xattr_set_acl(struct inode *inode, int type, const void *value,
if (!test_opt(inode->i_sb, POSIX_ACL))
return -EOPNOTSUPP;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EPERM;
if (value) {
......
......@@ -40,7 +40,7 @@ int ext4_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
if (IS_RDONLY(inode))
return -EROFS;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EACCES;
if (get_user(flags, (int __user *) arg))
......@@ -121,7 +121,7 @@ flags_err:
__u32 generation;
int err;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EPERM;
if (IS_RDONLY(inode))
return -EROFS;
......@@ -180,7 +180,7 @@ flags_err:
if (IS_RDONLY(inode))
return -EROFS;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EACCES;
if (get_user(rsv_window_size, (int __user *)arg))
......
......@@ -215,7 +215,7 @@ static int setfl(int fd, struct file * filp, unsigned long arg)
/* O_NOATIME can only be set by the owner or superuser */
if ((arg & O_NOATIME) && !(filp->f_flags & O_NOATIME))
if (current->fsuid != inode->i_uid && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EPERM;
/* required for strict SunOS emulation */
......
......@@ -78,7 +78,7 @@ generic_acl_set(struct inode *inode, struct generic_acl_operations *ops,
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
if (current->fsuid != inode->i_uid && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EPERM;
if (value) {
acl = posix_acl_from_xattr(value, size);
......
......@@ -74,7 +74,7 @@ int gfs2_acl_validate_remove(struct gfs2_inode *ip, int access)
{
if (!GFS2_SB(&ip->i_inode)->sd_args.ar_posix_acl)
return -EOPNOTSUPP;
if (current->fsuid != ip->i_inode.i_uid && !capable(CAP_FOWNER))
if (!is_owner_or_cap(&ip->i_inode))
return -EPERM;
if (S_ISLNK(ip->i_inode.i_mode))
return -EOPNOTSUPP;
......
......@@ -38,7 +38,7 @@ int hfsplus_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
if (IS_RDONLY(inode))
return -EROFS;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EACCES;
if (get_user(flags, (int __user *)arg))
......
......@@ -435,7 +435,7 @@ static int jffs2_acl_setxattr(struct inode *inode, int type, const void *value,
struct posix_acl *acl;
int rc;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EPERM;
if (value) {
......
......@@ -69,7 +69,7 @@ int jfs_ioctl(struct inode * inode, struct file * filp, unsigned int cmd,
if (IS_RDONLY(inode))
return -EROFS;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EACCES;
if (get_user(flags, (int __user *) arg))
......
......@@ -697,7 +697,7 @@ static int can_set_system_xattr(struct inode *inode, const char *name,
struct posix_acl *acl;
int rc;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EPERM;
/*
......
......@@ -1576,7 +1576,7 @@ int may_open(struct nameidata *nd, int acc_mode, int flag)
/* O_NOATIME can only be set by the owner or superuser */
if (flag & O_NOATIME)
if (current->fsuid != inode->i_uid && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EPERM;
/*
......
......@@ -63,7 +63,7 @@ static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
goto bail_unlock;
status = -EACCES;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
goto bail_unlock;
if (!S_ISDIR(inode->i_mode))
......
......@@ -51,8 +51,7 @@ int reiserfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
if (IS_RDONLY(inode))
return -EROFS;
if ((current->fsuid != inode->i_uid)
&& !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EPERM;
if (get_user(flags, (int __user *)arg))
......@@ -81,7 +80,7 @@ int reiserfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
case REISERFS_IOC_GETVERSION:
return put_user(inode->i_generation, (int __user *)arg);
case REISERFS_IOC_SETVERSION:
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EPERM;
if (IS_RDONLY(inode))
return -EROFS;
......
......@@ -21,7 +21,7 @@ xattr_set_acl(struct inode *inode, int type, const void *value, size_t size)
if (!reiserfs_posixacl(inode->i_sb))
return -EOPNOTSUPP;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
if (!is_owner_or_cap(inode))
return -EPERM;
if (value) {
......
......@@ -106,7 +106,7 @@ long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags
if (IS_IMMUTABLE(inode))
goto dput_and_out;
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER)) {
if (!is_owner_or_cap(inode)) {
if (f) {
if (!(f->f_mode & FMODE_WRITE))
goto dput_and_out;
......
......@@ -60,8 +60,7 @@ xattr_permission(struct inode *inode, const char *name, int mask)
if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
return -EPERM;
if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) &&
(mask & MAY_WRITE) && (current->fsuid != inode->i_uid) &&
!capable(CAP_FOWNER))
(mask & MAY_WRITE) && !is_owner_or_cap(inode))
return -EPERM;
}
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment