From: Wang Shilong <wshilong@xxxxxxx>
From: Wang Shilong <wshilong@xxxxxxx>
Currently, Filesystem use FS_IOC_FS_SETXATTR ioctl
to change project ID of file. However we don't
support ioctl on symlink files, and it is desirable
to change symlink files' project ID just like uid/gid.
This patch try to reuse existed interface fchownat(),
use group id to set project ID if flag AT_FCHOWN_PROJID
passed in.
Signed-off-by: Wang Shilong <wshilong@xxxxxxx>
---
fs/attr.c | 26 ++++++++++++++++++++++++--
fs/open.c | 29 +++++++++++++++++++++++------
fs/quota/dquot.c | 23 +++++++++++++++++++++++
include/linux/fs.h | 3 +++
include/linux/quotaops.h | 9 +++++++++
include/uapi/linux/fcntl.h | 1 +
tools/include/uapi/linux/fcntl.h | 1 +
7 files changed, 84 insertions(+), 8 deletions(-)
diff --git a/fs/attr.c b/fs/attr.c
index d22e8187477f..c6b1c1132c8f 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -85,6 +85,28 @@ int setattr_prepare(struct dentry *dentry, struct iattr *attr)
if ((ia_valid & ATTR_GID) && !chgrp_ok(inode, attr->ia_gid))
return -EPERM;
+ /*
+ * Project Quota ID state is only allowed to change from within the init
+ * namespace. Enforce that restriction only if we are trying to change
+ * the quota ID state. Everything else is allowed in user namespaces.
+ */
+ if ((ia_valid & ATTR_PROJID) && current_user_ns() != &init_user_ns) {
+ kprojid_t projid;
+ int rc;
+
+ /*
+ * Filesystem like xfs does't have ->get_projid hook
+ * should check permission by themselves.
+ */
+ if (inode->i_sb->dq_op->get_projid) {
+ rc = inode->i_sb->dq_op->get_projid(inode, &projid);
+ if (rc)
+ return rc;
+ if (!projid_eq(projid, attr->ia_projid))
+ return -EPERM;
+ }
+ }
+
/* Make sure a caller can chmod. */
if (ia_valid & ATTR_MODE) {
if (!inode_owner_or_capable(inode))
@@ -232,8 +254,8 @@ int notify_change(struct dentry * dentry, struct iattr * attr, struct inode **de
unsigned int ia_valid = attr->ia_valid;
WARN_ON_ONCE(!inode_is_locked(inode));
-
- if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_TIMES_SET)) {
+ if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_PROJID |
+ ATTR_TIMES_SET)) {
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
return -EPERM;
}
diff --git a/fs/open.c b/fs/open.c
index 0285ce7dbd51..4e58c6ee23b3 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -597,7 +597,8 @@ SYSCALL_DEFINE2(chmod, const char __user *, filename, umode_t, mode)
return do_fchmodat(AT_FDCWD, filename, mode);
}
-static int chown_common(const struct path *path, uid_t user, gid_t group)
+static int chown_common(const struct path *path, uid_t user, gid_t group,
+ bool set_project)
{
struct inode *inode = path->dentry->d_inode;
struct inode *delegated_inode = NULL;
@@ -605,9 +606,11 @@ static int chown_common(const struct path *path, uid_t user, gid_t group)
struct iattr newattrs;
kuid_t uid;
kgid_t gid;
+ kprojid_t projid;
uid = make_kuid(current_user_ns(), user);
gid = make_kgid(current_user_ns(), group);
+ projid = make_kprojid(current_user_ns(), (projid_t)group);
retry_deleg:
newattrs.ia_valid = ATTR_CTIME;
@@ -620,13 +623,22 @@ static int chown_common(const struct path *path, uid_t user, gid_t group)
if (group != (gid_t) -1) {
if (!gid_valid(gid))
return -EINVAL;
- newattrs.ia_valid |= ATTR_GID;
- newattrs.ia_gid = gid;
+ if (!set_project) {
+ newattrs.ia_valid |= ATTR_GID;
+ newattrs.ia_gid = gid;
+ } else {
+ newattrs.ia_valid |= ATTR_PROJID;
+ newattrs.ia_projid = projid;
+ }
+ } else if (set_project) {
+ return -EINVAL;
}
if (!S_ISDIR(inode->i_mode))
newattrs.ia_valid |=
ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV;
inode_lock(inode);
+ if (set_project)
+ gid = make_kgid(current_user_ns(), (gid_t) -1);
error = security_path_chown(path, uid, gid);
if (!error)
error = notify_change(path->dentry, &newattrs, &delegated_inode);
@@ -645,10 +657,15 @@ int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
struct path path;
int error = -EINVAL;
int lookup_flags;
+ bool set_project = false;
- if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0)
+ if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH |
+ AT_FCHOWN_PROJID)) != 0)
goto out;
+ if (flag & AT_FCHOWN_PROJID)
+ set_project = true;
+
lookup_flags = (flag & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
if (flag & AT_EMPTY_PATH)
lookup_flags |= LOOKUP_EMPTY;
@@ -659,7 +676,7 @@ int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
error = mnt_want_write(path.mnt);
if (error)
goto out_release;
- error = chown_common(&path, user, group);
+ error = chown_common(&path, user, group, set_project);
mnt_drop_write(path.mnt);
out_release:
path_put(&path);
@@ -700,7 +717,7 @@ int ksys_fchown(unsigned int fd, uid_t user, gid_t group)
if (error)
goto out_fput;
audit_file(f.file);
- error = chown_common(&f.file->f_path, user, group);
+ error = chown_common(&f.file->f_path, user, group, false);
mnt_drop_write_file(f.file);
out_fput:
fdput(f);
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index fc20e06c56ba..46f39ee87312 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -2095,6 +2095,29 @@ int dquot_transfer(struct inode *inode, struct iattr *iattr)
}
transfer_to[GRPQUOTA] = dquot;
}
+
+ if (iattr->ia_valid & ATTR_PROJID) {
+ kprojid_t projid;
+
+ if (!inode->i_sb->dq_op->get_projid)
+ return -ENOTSUPP;
+
+ ret = inode->i_sb->dq_op->get_projid(inode, &projid);
+ if (ret)
+ return ret;
+ if (!projid_eq(iattr->ia_projid, projid)) {
+ dquot = dqget(sb, make_kqid_projid(iattr->ia_projid));
+ if (IS_ERR(dquot)) {
+ if (PTR_ERR(dquot) != -ESRCH) {
+ ret = PTR_ERR(dquot);
+ goto out_put;
+ }
+ dquot = NULL;
+ }
+ transfer_to[PRJQUOTA] = dquot;
+ }
+ }
+
ret = __dquot_transfer(inode, transfer_to);
out_put:
dqput_all(transfer_to);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 29d8e2cfed0e..2a878a2b90e3 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -37,6 +37,7 @@
#include <linux/uuid.h>
#include <linux/errseq.h>
#include <linux/ioprio.h>
+#include <linux/projid.h>
#include <asm/byteorder.h>
#include <uapi/linux/fs.h>
@@ -191,6 +192,7 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
#define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */
#define ATTR_TIMES_SET (1 << 16)
#define ATTR_TOUCH (1 << 17)
+#define ATTR_PROJID (1 << 18)
/*
* Whiteout is represented by a char device. The following constants define the
@@ -213,6 +215,7 @@ struct iattr {
umode_t ia_mode;
kuid_t ia_uid;
kgid_t ia_gid;
+ kprojid_t ia_projid;
loff_t ia_size;
struct timespec64 ia_atime;
struct timespec64 ia_mtime;
diff --git a/include/linux/quotaops.h b/include/linux/quotaops.h
index dc905a4ff8d7..84d3aeb43e2c 100644
--- a/include/linux/quotaops.h
+++ b/include/linux/quotaops.h
@@ -22,6 +22,15 @@ static inline struct quota_info *sb_dqopt(struct super_block *sb)
/* i_mutex must being held */
static inline bool is_quota_modification(struct inode *inode, struct iattr *ia)
{
+ if (ia->ia_valid & ATTR_PROJID && inode->i_sb->dq_op->get_projid) {
+ kprojid_t projid;
+ int rc;
+
+ rc = inode->i_sb->dq_op->get_projid(inode, &projid);
+ if (!rc && !projid_eq(projid, ia->ia_projid))
+ return true;
+ }
+
return (ia->ia_valid & ATTR_SIZE && ia->ia_size != inode->i_size) ||
(ia->ia_valid & ATTR_UID && !uid_eq(ia->ia_uid, inode->i_uid)) ||
(ia->ia_valid & ATTR_GID && !gid_eq(ia->ia_gid, inode->i_gid));
diff --git a/include/uapi/linux/fcntl.h b/include/uapi/linux/fcntl.h
index 6448cdd9a350..712c60d7f727 100644
--- a/include/uapi/linux/fcntl.h
+++ b/include/uapi/linux/fcntl.h
@@ -90,5 +90,6 @@
#define AT_STATX_FORCE_SYNC 0x2000 /* - Force the attributes to be sync'd with the server */
#define AT_STATX_DONT_SYNC 0x4000 /* - Don't sync attributes with the server */
+#define AT_FCHOWN_PROJID 0x40000000 /* Change project ID instead of group id */
#endif /* _UAPI_LINUX_FCNTL_H */
diff --git a/tools/include/uapi/linux/fcntl.h b/tools/include/uapi/linux/fcntl.h
index 6448cdd9a350..712c60d7f727 100644
--- a/tools/include/uapi/linux/fcntl.h
+++ b/tools/include/uapi/linux/fcntl.h
@@ -90,5 +90,6 @@
#define AT_STATX_FORCE_SYNC 0x2000 /* - Force the attributes to be sync'd with the server */
#define AT_STATX_DONT_SYNC 0x4000 /* - Don't sync attributes with the server */
+#define AT_FCHOWN_PROJID 0x40000000 /* Change project ID instead of group id */
#endif /* _UAPI_LINUX_FCNTL_H */
--
2.19.1
