Use inode_capable() to check if SUID|SGID bits should be cleared to match
similar check in inode_change_ok().
The check for CAP_LINUX_IMMUTABLE was not modified since all other file
systems also check against init_user_ns rather than current_user_ns.
Only allow changing of projid from init_user_ns.
Signed-off-by: Dwight Engen <dwight.engen@xxxxxxxxxx>
---
fs/xfs/xfs_ioctl.c | 11 +++++++++--
kernel/capability.c | 1 +
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 6e2bca5..7b42192 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -981,15 +981,22 @@ xfs_ioctl_setattr(
* to the file owner ID, except in cases where the
* CAP_FSETID capability is applicable.
*/
- if (current_fsuid() != ip->i_d.di_uid && !capable(CAP_FOWNER)) {
+ if (!inode_owner_or_capable(VFS_I(ip))) {
code = XFS_ERROR(EPERM);
goto error_return;
}
/*
* Do a quota reservation only if projid is actually going to change.
+ * Only allow changing of projid from init_user_ns since it is a
+ * non user namespace aware identifier.
*/
if (mask & FSX_PROJID) {
+ if (current_user_ns() != &init_user_ns) {
+ code = XFS_ERROR(EINVAL);
+ goto error_return;
+ }
+
if (XFS_IS_QUOTA_RUNNING(mp) &&
XFS_IS_PQUOTA_ON(mp) &&
xfs_get_projid(ip) != fa->fsx_projid) {
@@ -1103,7 +1110,7 @@ xfs_ioctl_setattr(
* cleared upon successful return from chown()
*/
if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) &&
- !capable(CAP_FSETID))
+ !inode_capable(VFS_I(ip), CAP_FSETID))
ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);
/*
diff --git a/kernel/capability.c b/kernel/capability.c
index f6c2ce5..a4b6744 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -464,3 +464,4 @@ bool inode_capable(const struct inode *inode, int cap)
return ns_capable(ns, cap) && kuid_has_mapping(ns, inode->i_uid);
}
+EXPORT_SYMBOL(inode_capable);
--
1.8.1.4
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