@@ -2246,10 +2246,8 @@ void inode_init_owner(struct user_namespace *mnt_userns, struct inode *inode,
/* Directories are special, and always inherit S_ISGID */
if (S_ISDIR(mode))
mode |= S_ISGID;
- else if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP) &&
- !in_group_p(i_gid_into_mnt(mnt_userns, dir)) &&
- !capable_wrt_inode_uidgid(mnt_userns, dir, CAP_FSETID))
- mode &= ~S_ISGID;
+ else
+ mode = mode_strip_sgid(mnt_userns, dir, mode);
} else
inode_fsgid_set(inode, mnt_userns);
inode->i_mode = mode;
@@ -2405,3 +2403,34 @@ struct timespec64 current_time(struct inode *inode)
return timestamp_truncate(now, inode);
}
EXPORT_SYMBOL(current_time);
+
+/**
+ * mode_strip_sgid - handle the sgid bit for non-directories
+ * @mnt_userns: User namespace of the mount the inode was created from
+ * @dir: parent directory inode
+ * @mode: mode of the file to be created in @dir
+ *
+ * If the @mode of the new file has both the S_ISGID and S_IXGRP bit
+ * raised and @dir has the S_ISGID bit raised ensure that the caller is
+ * either in the group of the parent directory or they have CAP_FSETID
+ * in their user namespace and are privileged over the parent directory.
+ * In all other cases, strip the S_ISGID bit from @mode.
+ *
+ * Return: the new mode to use for the file
+ */
+umode_t mode_strip_sgid(struct user_namespace *mnt_userns,
+ const struct inode *dir, umode_t mode)
+{
+ if ((mode & (S_ISGID | S_IXGRP)) != (S_ISGID | S_IXGRP))
+ return mode;
+ if (S_ISDIR(mode) || !dir || !(dir->i_mode & S_ISGID))
+ return mode;
+ if (in_group_p(i_gid_into_mnt(mnt_userns, dir)))
+ return mode;
+ if (capable_wrt_inode_uidgid(mnt_userns, dir, CAP_FSETID))
+ return mode;
+
+ mode &= ~S_ISGID;
+ return mode;
+}
+EXPORT_SYMBOL(mode_strip_sgid);
@@ -1897,6 +1897,8 @@ extern long compat_ptr_ioctl(struct file *file, unsigned int cmd,
void inode_init_owner(struct user_namespace *mnt_userns, struct inode *inode,
const struct inode *dir, umode_t mode);
extern bool may_open_dev(const struct path *path);
+umode_t mode_strip_sgid(struct user_namespace *mnt_userns,
+ const struct inode *dir, umode_t mode);
/*
* This is the "filldir" function type, used by readdir() to let
Add a dedicated helper to handle the setgid bit when creating a new file in a setgid directory. This is a preparatory patch for moving setgid stripping into the vfs. The patch contains no functional changes. Currently the setgid stripping logic is open-coded directly in inode_init_owner() and the individual filesystems are responsible for handling setgid inheritance. Since this has proven to be brittle as evidenced by old issues we uncovered over the last months (see [1] to [3] below) we will try to move this logic into the vfs. Link: e014f37db1a2 ("xfs: use setattr_copy to set vfs inode attributes") [1] Link: 01ea173e103e ("xfs: fix up non-directory creation in SGID directories") [2] Link: fd84bfdddd16 ("ceph: fix up non-directory creation in SGID directories") [3] Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org> Reviewed-and-Tested-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com> --- v8->v9: 1.move if orders in mode_strip_sgid helper 2.xfstests testcase url https://patchwork.kernel.org/project/fstests/list/?series=643643 fs/inode.c | 37 +++++++++++++++++++++++++++++++++---- include/linux/fs.h | 2 ++ 2 files changed, 35 insertions(+), 4 deletions(-)